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Cyclic voltammetry and spectroelectrochemistry of rhodium phthalocyanines

  • Authors: Nyokong, Tebello
  • Date: 1994
  • Subjects: To be catalogued
  • Language: English
  • Type: text , article
  • Identifier: http://hdl.handle.net/10962/295486 , vital:57346 , xlink:href="https://doi.org/10.1039/DT9940001359"
  • Description: The electrochemistry of RhIII(pc)(pc = phthalocyanine dianion) complexes containing chloride, pyridine, dimethyl sulfoxide (dmso) and cyanide as axial ligands was investigated by cyclic voltammetry and UV/VIS spectroelectrochemistry. The compounds were K[Rh(pc)(CN)2], [Rh(pc)(Cl)(py)] and [Rh(pc)Cl(dmso)]. For all of these the first oxidation occurs at the phthalocyanine ligand with the formation of a π-cation radical species. The addition of one electron to the complexes leads to one of two different reduction products depending on the nature of the axial ligands. The first reduction of [Rh(pc)Cl(py)] and [Rh(pc)Cl(dmso)] occurs at the metal, followed by rapid dimerization of the reduced species. The first and subsequent reductions of K[Rh(pc)(CN)2] occur at the ring.
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  • Date Issued: 1994

Editorial

  • Authors: Janse van Rensburg, Eureta , Irwin, Patrick R
  • Date: 1994
  • Subjects: To be catalogued
  • Language: English
  • Type: text , article
  • Identifier: http://hdl.handle.net/10962/438694 , vital:73491 , xlink:href="https://www.ajol.info/index.php/sajee/article/view/137493"
  • Description: In 1993 environmental education was looking forward to the first democratic election in South Africa - now it is in the midst of 'reconstructionand-development'. For many local environmental educators, this means a contrihution, in one way or another, to the new national curriculum. But the challenges of 1993 continue: processes of participative curriculum development are forcing us to clarify different orientations to environmental education in our efforts to shape a curriculum based on the best of our various visions.
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  • Date Issued: 1994

Photoassisted electron transfer between sulfur dioxide and tin (IV) phthalocyanines

  • Authors: Nyokong, Tebello
  • Date: 1994
  • Subjects: To be catalogued
  • Language: English
  • Type: text , article
  • Identifier: http://hdl.handle.net/10962/295520 , vital:57349 , xlink:href="https://doi.org/10.1039/C39940001983"
  • Description: Photolysis of tin(IV) phthalocyanine complexes in the presence of sulfur dioxide shows a first-order kinetic dependence on sulfur dioxide, and a one-electron reduction of SnPc to an anion radical species.
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  • Date Issued: 1994

Photoreduction of tin (IV) phthalocyanines

  • Authors: Nyokong, Tebello
  • Date: 1994
  • Subjects: To be catalogued
  • Language: English
  • Type: text , article
  • Identifier: http://hdl.handle.net/10962/293413 , vital:57083 , xlink:href="https://doi.org/10.1016/S0277-5387(00)83491-9"
  • Description: Photolysis of Sn(IV)Pc(OH)2 (Pc = phthalocyanine dianion) and Sn(IV)Pc(Cl)2 using a tungsten lamp, and in the presence of SnCl2·2H2O as an electron donor results in the reduction of these complexes of π anion radical species. The reduction shows second order dependence on the concentration of the Sn(IV)Pc complexes and a first order dependence on SnCl2·H2O.
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  • Date Issued: 1994

Redox reactions of an Mo (V) tetrasulfophthalocyanine

  • Authors: Ferraudi, Guillermo , Nyokong, Tebello , Feliz, Mario , Perkovic, Marc , Rillema, D Paul
  • Date: 1994
  • Subjects: To be catalogued
  • Language: English
  • Type: text , article
  • Identifier: http://hdl.handle.net/10962/295530 , vital:57351 , xlink:href="https://doi.org/10.1016/0020-1693(93)03664-V"
  • Description: The preparation of an Mo(V) tetrasulfophthalocyanine and some of its thermal and photochemical reactions have been investigated in this work. Electrochemical processes have been followed by means of the UVVis spectral changes and compared with those observed in flash photolysis. Mo(IV) and Mo(V)-ligand-radical species are common intermediates of the electrochemical and photochemical reactions. In 254 nm irradiations of the Mo(V) tetrasulfophthalocyanine in aqueous solutions of 2-propanol, the macrocycle can be photohydrogenated and the product of the photolysis can be reoxidized with O2 back to the parent complex.
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  • Date Issued: 1994

Research priorities for environmental education in southern Africa: Preliminary report

  • Authors: Janse van Rensburg, Eureta
  • Date: 1994
  • Subjects: To be catalogued
  • Language: English
  • Type: text , article
  • Identifier: http://hdl.handle.net/10962/438781 , vital:73499 , xlink:href="https://www.ajol.info/index.php/sajee/article/view/137480"
  • Description: In this preliminary research report I introduce initial interpretations of the results of a recently completed study on research priorities in southern Africa. The study has been sponsored by Murray and Roberts, Rhodes University and the HNRE (Human and Natural Resources in the Environment) Programme of the Human Sciences Research Council.
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  • Date Issued: 1994

The search for daily meaning: A technique for career counselling

  • Authors: Rainier, Markseller Garrett
  • Date: 1994
  • Subjects: Uncatalogued
  • Language: English
  • Type: Master's theses , text
  • Identifier: http://hdl.handle.net/10962/193003 , vital:45289
  • Description: Because work is such a tremendous potential source of meaning in an individual’s life, techniques which turn career choice into technical talent matching are inadequate. The individual’s search for authentic meaning needs to be the focus of career counselling, but few approaches have been able to addressed this relationship between working and living. Major developments in career theory are reviewed to highlight the distinction between the more technical logical positivist and the phenomenological approaches. Super’s Career- Development Assessment and Counselling (C-DAC) model is described in detail as it is the first significant attempt to move beyond the technical approaches by incorporating developmental theory into career counselling and by stressing the role of counsellee readiness to use the information provided. However, especially in South Africa, any test-based approach to career counselling runs the risk of shifting the locus of control from the counsellee to the counsellor, so an autobiographical non-test approach, the life-line, is introduced to assist counsellees in their search for personal meaning without running the risks associated with test-based assessments. The life-line helps to contextualise the choice of work within the counsellee’s subjective life experience and turns career counselling into a shared search for a range of personal meanings rather than the provision, by the counsellor, of a limiting interpretation. Three case studies are presented to demonstrate the use of the life-line, and the conclusions arrived at are shown to be essentially1 similar to conclusions obtained from using the C-DAC battery. The advantages and limitations of the life-line are discussed and its ability to combat problems associated with school based career counselling is outlined as well as its usefulness with mid-life career changers, in cross-cultural contexts, and in group counselling. , Thesis (MA) -- Faculty of Humanities, Psychology, 1990
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  • Date Issued: 1994

An understanting of mirrors and mirroring in a schizophrenic patient obsessed with his appearance

  • Authors: Zworestine, Barry John
  • Date: 1993-04
  • Subjects: Uncatalogued
  • Language: English
  • Type: Master's theses , text
  • Identifier: http://hdl.handle.net/10962/191702 , vital:45149
  • Description: This work addresses the role of mirroring and mirrors encountered while working with a patient obsessed with his appearance. At the same time, however, it also attempts to provide an understanding of the process of mirroring from the developing unborn child to the adult. It examines the womb as a reflective space, the mirroring role of the mother, psychological work as mirror work, the psychopathologies of disruptive mirroring and the nature of reflection as a story, confusion and a ghostly other, and finally, the relationship between mirror reflection and psychological life. What is examined and described in this process applies not only to the specific case in study but is relevant at a universal level to all of mankind regardless of race or religion. The case-study method was used to examine the process of therapy that took place over three months. The patient’s identifying data, reasons for referral, presenting problem, family background, basic personality, interpersonal relationships, mental state, diagnosis, dynamic formulation and rationale for psychotherapy were covered in detail. The process of psychotherapy over 27 sessions was recounted and discussed in detail. Theoretical understandings drawn on to facilitate an understanding of the case were from Davis and Walbridge on Winnicolt, Winnicot, Liedloff, Kay, Romanyshyn, Bettelheim, Schwartz and others. , Thesis (MA) -- Faculty of Humanities, Psychology, 1993
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  • Date Issued: 1993-04

Interaction of cyanide with iron (II) phthalocyanine

  • Authors: Nyokong, Tebello
  • Date: 1993
  • Subjects: To be catalogued
  • Language: English
  • Type: text , article
  • Identifier: http://hdl.handle.net/10962/295497 , vital:57347 , xlink:href="https://doi.org/10.1039/DT9930003601"
  • Description: The kinetics and equilibria for the reaction between cyanide and iron (II) phthalocyanine [Fe(pc)](H2pc = phthalocyanine) in dimethyl sulfoxide (dmso) were studied at 25 °C. The complex [Fe(pc)(CN)2]2– is formed in two consecutive pseudo-first-order processes with k2f= 17.5 ± 0.8 dm3 mol–1 s–1 and k3f= 0.20 ± 0.05 dm3 mol–1 s–1, where k2f and k3f are the rate constants for the binding of the first and second cyanide ligands, respectively. The equilbrium constants were fund to be K2= 3.0 × 103 dm3 mol–1 and K3= 5.7 × 102 dm3 mol–1, for the formation of [Fe(pc)(CN)(dmso)]– and [Fe(pc)(CN)2]2–, respectively.
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  • Date Issued: 1993

Kinetics of the reaction of cyanide with ruthenium phthalocyanine complexes

  • Authors: Nyokong, Tebello , Guthrie-Strachan, Jeffry
  • Date: 1993
  • Subjects: To be catalogued
  • Language: English
  • Type: text , article
  • Identifier: http://hdl.handle.net/10962/295509 , vital:57348 , xlink:href="https://doi.org/10.1016/S0020-1693(00)85128-2"
  • Description: Kinetic studies of the reaction of cyanide with (CO)(DMF)RuPc and (DMSO)2RuPc in DMF are reported. In the presence of a large excess of cyanide, the (CN)2RuPc complex is formed by pseudo first order kinetics. The reaction is first order in both cyanide and phthalocyanine, with specific rate constants of 5.2×10−2 and 7.2×10−2 M−1 s−1 for reactions of cyanide with (CO)(DMF)RuPc and (DMSO)2RuPc, respectively. The rate constants correspond to the coordination of the second cyanide ligand to the ruthenium phthalocyanine species.
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  • Date Issued: 1993

Self-reports on the effectiveness of psychotherapy with therapists-in-training: an 18-month follow-up study at a psychology training clinic

  • Authors: Angus, Catherine Clare
  • Date: 1993
  • Subjects: Uncatalogued
  • Language: English
  • Type: Master's theses , text
  • Identifier: http://hdl.handle.net/10962/193069 , vital:45295
  • Description: The purpose of this study is to ascertain whether the clients who make use of the services of the Psychology Clinic at Rhodes University perceive the masters students being trained at the Clinic as providing adequate psychotherapy. Using a sample of 18 clients, who underwent psychotherapy at the Rhodes Psychology Clinic during 1990, a follow-up study was conducted to ascertain the perceived success of that psychotherapy. Those variables most pertinent to the outcome of psychotherapy are examined. The study uses both qualitative and quantitative methodology and shows that, overall, 89% of the clients who participated in this study perceived the psychotherapy at the Rhodes Psychology Clinic to be satisfactory. The study also highlights those factors which were perceived to be negative in the psychotherapeutic equation and it is hoped that the findings can be beneficial in planning more efficient services for the Clinic in the future. , Thesis (MA) -- Faculty of Humanities, Psychology, 1993
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  • Date Issued: 1993

The Kinetic-Tree-House-Person drawing test as a diagnostic instrument in assessment of sexually abused children and monitoring the effects of group play therapy

  • Authors: Donaldson, Marilyn Ann
  • Date: 1993
  • Subjects: Uncatalogued
  • Language: English
  • Type: Master's theses , text
  • Identifier: http://hdl.handle.net/10962/193140 , vital:45302
  • Description: This research project was developed from the idea that children's drawings reflect both their internal emotional lives and their external lived worlds. The subjects of the project were sexually abused children referred to Fort England Hospital during the first half of 1992. The Kinetic-Tree-House-Person projective drawing test was used as an instrument of assessment in conjunction with the Maudsley Child Psychiatric interview technique. Indications of the effects of sexual abuse were sought in drawing tests administered before and after interventions of ten sessions of group play therapy. Drawing tests were also administered to a control group of children. The research project explored the effectiveness of group play therapy interventions through comparison of pre intervention and post intervention drawings. The rationale for this project was the high incidence of rape and sexual abuse of prepubescent black young women in the Eastern Cape particularly, and in South Africa generally. There is need for both assessments of screening instruments and validation of therapeutic interventions if this problem is to be addressed adequately. , Thesis (MA) -- Faculty of Humanities, Psychology, 1993
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  • Date Issued: 1993

The nature of the oxidation products of dicyanoruthenium phthalocyanine in aqueous and non-aqueous solvents

  • Authors: Nyokong, Tebello
  • Date: 1993
  • Subjects: To be catalogued
  • Language: English
  • Type: text , article
  • Identifier: http://hdl.handle.net/10962/295543 , vital:57352 , xlink:href="https://doi.org/10.1016/S0277-5387(00)81741-6"
  • Description: The cyclic voltammetry of [(CN)2RuIIPc]2− in acetonitrile or dichloromethane shows two oxidation couples at E12 = 0.31 and 0.85 V (vs S.C.E.) in CH2Cl2 and E12 = 0.45 and 1.15 V (vs S.C.E.) in acetonitrile. The spectroelectrochemistry of [(CN)2RuIIPc]2− in these solvents showed that oxidations occur at the phthalocyanine ligand. K2[(CN)2RuIIPc] dissolves in water at pHs greater than 5. The cyclic voltammetry of this complex showed oxidation couples at 0.32 and 0.29 V (vs S.C.E.) for aqueous solutions containing sodium sulphate (0.1M) and for buffered solutions (pH = 9), respectively. Both cyclic voltammetry and controlled potential coulometry gave evidence of electrocrystallization of the oxidation product. Chemical oxidations of [(CN)2RuIIPc]2− in water also showed phthalocyanine ligand oxidation.
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  • Date Issued: 1993

A study of the manifestations of the death instinct as evidenced in the case of a pathological organization

  • Authors: De Villiers, Jeanine
  • Date: 1991-04
  • Subjects: Uncatalogued
  • Language: English
  • Type: Master's theses , text
  • Identifier: http://hdl.handle.net/10962/191691 , vital:45148
  • Description: The case study method was used to investigate the manifestations of the death instinct as evidenced in a pathological organization. Work of Kleinian analysts in this area was employed as a basis for interrogating the material that emerged in a five month psychotherapy with a borderline disordered patient. It was demonstrated how the pathological organization was employed as a means of evading paranoid- schizoid fears and depressive position anxieties. Two ways in which defences were assembled into the pathological organization could be traced, both leading to resistance in the therapy. The one set of defences would entail a complete withdrawal from contact, where the patient would hold herself aloof from experience through a solitary invulnerability. The other set of defences involved an active attack on the vulnerable, libidinal self. Identified with the bad, anti-libidinal self, the patient would attempt to annihilate the libidinal self in various ways. Fragmentation of her thoughts and memories, self-destructive behaviour and phantasized and actual attacks on the objects in her world which called forth her neediness were all evidenced. In conclusion, the issue of whether a more active interpretation of the manifestations of the death instinct or a less interpretative, more holding therapeutic stance should be adopted in the therapy with patients exhibiting a pathological organization was raised. , Thesis (MA) -- Faculty of Humanities, Psychology, 1991
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  • Date Issued: 1991-04

"The word as image": survey with special reference to the twentieth century

  • Authors: Edworthy, S
  • Date: 1991-03
  • Subjects: Uncatalogued
  • Language: English
  • Type: Master's theses , text
  • Identifier: http://hdl.handle.net/10962/191247 , vital:45075
  • Description: This essay is intended, firstly for those who at some time have had the urge to include words into their otherwise conventional representational images, but are deterred by the suspicion that such elements have no place in the picture plane. Secondly, it is hoped, that this dissertation will provide some understanding concerning the motivations and aims of artists, using "verbal symbols" in their visual images. At this point, I offer some explanation of the term "verbal symbols". The alphabet that we are accustomed to today differs vastly from the first writing that was invented. The naming of items nowadays is arbitrarily established and all we are left with is a name that bears no visual resemblance to the object it represents in real life. The word "house", for example, tells us nothing of the physical nature of a house. However, owing to our conditioning, the word evokes in us a mental picture of a house, even if the details of this picture will vary amongst individuals. Words then are symbols which denote, broadly speaking, objects that exist in our daily lives, without being in any way visual representations of these objects. Of course there are also words which are dependent on other words for their meaning, such as prepositions, conjunctions or suffices, but this is irrelevant to this essay. , Thesis (MFA) -- Faculty of Humanities, Fine Art, 1991
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  • Date Issued: 1991-03

Rites of passage: Substance dependence and the negotiation of development tasks - a case study

  • Authors: Roux, Catharina
  • Date: 1991
  • Subjects: Uncatalogued
  • Language: English
  • Type: Master's theses , text
  • Identifier: http://hdl.handle.net/10962/193242 , vital:45313
  • Description: This thesis is an attempt to provide an understanding of drug addiction in its relation to the tasks and arrests which take place during the developmental process. Current theories of drug addiction are situated within the parameters of developmental theory; Object Relations Theory, Lacanian Structuralism and Freud’s concept of the Oedipus Complex are drawn on. The dual regressive and progressive function of drugs as it relates to developmental tasks and arrests is illustrated, the argument being that a very specific relationship exists between the compulsive use of drugs and the developmental tasks which need to be avoided as well as those which need to be negotiated. The case study research method is made use of in the attempt to illustrate the links between drug addiction and specific developmental tasks. I present an in-depth analysis of the developmental history of Rafiq Jaffer, an inpatient at the drug unit at Lentegeur Psychiatric Hospital, drawing on the material which was collected during nine months of individual therapy. As Borderline Personality Disorder is the primary diagnosis in the case of Rafiq Jaffer, the emphasis is by necessity put on borderline pathology. The primary aim of the thesis is, however, to highlight the need to understand the compulsive use of drugs within the context of the developmental process, thereby developing a conceptualisation against which further cases may be tested. , Thesis (MA) -- Faculty of Humanities, Psychology, 1991
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  • Date Issued: 1991

Bulimia Nervosa: a case study in cognitive psychotherapy

  • Authors: Kanfer, Josephine
  • Date: 1990
  • Subjects: Uncatalogued
  • Language: English
  • Type: Master's theses , text
  • Identifier: http://hdl.handle.net/10962/192988 , vital:45287
  • Description: This project uses the case-study method to illustrate the application of integrating varied accepted modes of psychotherapeutic interventions. It concentrates on the first 22 out-patient sessions of therapy with a diagnosed bulimic, spanning a 6 month period. A brief summary of the subsequent 10 follow-up sessions is also given. The case presented is of a 22 year old female student diagnosed as bulimic (of 7 year duration), dysthymic and with a dependent personality disorder. She has symptoms of anxiety. She has a history of anorexia nervosa. Fairburn's (1985) cognitive-behavioural programme for bulimia was used initially. Its structured framework with the emphasis on the eating behaviour was an essential aspect in contributing to the success of the initial phase of the therapy. This patient had had previously experienced 8 sessions of non-directive depth psychotherapy which had confused and compounded her problems. The structure had provided her with a sense of control. In implementing the second stage of Fairburn's programme, where the focus is cognitive, the patient could no longer work in this this structured manner. The attempts to implement the standard cognitive techniques provided the catalyst for activating deeper underlying emotions and cognitions. Furthermore, this gave impetus to work actively with the interpersonal aspect of the therapeutic relationship. Young's (1989) model for identifying Early Maladaptive Schemas could be applied. The focus then moved from the behaviours and dealt with these schemas as activated in the therapeutic relationship. The patient was able to make links to her family and her past. The therapy proved successful, as not only were the behavioural symptoms alleviated, but also the patient's interpersonal problems which underlay her personality disorder were accessed. The patient had become more self-assertive, her mood had improved considerably, she was less concerned with body image and more accepting of herself. She had become more reality based and her interpersonal relational abi1ity had improved. , Thesis (MA) -- Faculty of Humanities, Psychology, 1990
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  • Date Issued: 1990

The silent patient: a consideration of Gendlin's recommendations in the treatment of a silent adolescent

  • Authors: Le Roux, J D
  • Date: 1990
  • Subjects: Uncatalogued
  • Language: English
  • Type: Master's theses , text
  • Identifier: http://hdl.handle.net/10962/193054 , vital:45294
  • Description: This study comprises a dialogue between Gendlin's recommendations on the treatment of the silent patient and case-material taken from 39 sessions of psychodynamic psychotherapy with a 16 year old adolescent. The most characteristic feature of the therapy with this young person, was her pattern of silence and unresponsiveness. The aim of this study is to ascertain the usefulness of Gendlin's recommendations in the therapy of this category of patient. The dialogue between the suggested recommendations and the case- material served to illustrate the point that Gendlin's recommendations are of great value in the treatment of the silent adolescent. The value of these recommendations lie in their ability to comment meaningfully on the process of therapy with the silent patient by providing not only skills and techniques, but also a conceptual framework within which to contextualize the therapy. The recommendations were also found to be sensitive to some of the key issues of relevance to adolescence as a developmental phase. The case-study method was deemed an appropriate structure within which to conduct this examination. , Thesis (MA) -- Faculty of Humanities, Psychology, 1990
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  • Date Issued: 1990

Population structure, production, growth, reproduction and the ecology of Atherina breviceps Valenciennes, 1935 (Pisces : Atherinidae) and Gilchristella aestuaria (Gilchrist, 1914) (Pisces : Clupeidae), from two southern Cape coastal lakes

  • Authors: Ratte, Theodore Wilhlelm
  • Date: 1989-01
  • Subjects: Silversides , Clupeidae -- South Africa -- Cape of Good Hope
  • Language: English
  • Type: Doctoral theses , text
  • Identifier: http://hdl.handle.net/10948/50878 , vital:43029
  • Description: Over the period October 1978 to January 1981, a total of 147 853 Atherina breviceps with a total biomass of 55 2B0,7 g and 107 046 Gilchristella aestuaria with a total biomass of 33 708,9 g were collected in the Swartvlei System and 151 531 A. breviceps with a total biomass of 727 795,0 g and 51 258 G. aestuaria with a total biomass of 12 231,5 g were collected in Groenvlei, to determine their population structure, production, growth, reproduction and ecology in both systems. A. breviceps and G. aestuaria were collected from nine and eleven estuaries respectively, including Groenvlei, along the Cape coast to determine the degree of genetic divergence of both these two species in Groenvlei. It was found that the mature 0-year-old A. breviceps and the 2-year-old G. aestuaria dominated the catches in the Swartvlei System, whereas the juvenile 0-year-olds and 1-year-olds of both species respectively, dominated the catches in Groenvlei. The Swartvlei System and Groenvlei produced respectively between 10-12 metric tons of A. breviceps and between 5-3 metric tons of G. aestuaria annually. A. breviceps and G. aestuana in the Swartvlei System and Groenvlei attain observed ages of between 3 years and 7-8 years respectively. The main spawning period for both species is between spring-autumn in Groenvlei and for A. breviceps in the Swartvlei System. G. aestuaria has a continuous winter-summer spawning in the Swartvlei System. A. breviceps and G. aestuaria in Groenvlei have diverged to such an extent from these two species' populations in other systems, that A. breviceps and G. aestuaria in Groenvlei should receive a priority conservation status. , Thesis (PhD) -- Faculty of Science, 1989
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  • Date Issued: 1989-01

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