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Spectrophotometric techniques were used to elucidate the discrepancies surrounding the reduction of osmium tetroxide by several primary alcohols in a hydroxide matrix. In contrast to the documented literature, this reaction was observed to occur in two consecutive reaction steps. Geometrical and computational analysis of kinetic data revealed that the reaction proceeds by the following reaction model: Os(VIII) + RCH2OH Os(VI) + RCHO Os(VIII) + Os(VI) Os2(VII) k1 k+2 k-2 The conditional rate constants and molar extinction coefficients were calculated using custom written software. A hydride transfer mechanism, coupled with the synchronous removal of the hydroxyl proton of the alcohol, was postulated. The complexation between osmium(VIII) and osmium(VI) was investigated. Mole ratio titrations and mole fraction plots show that at pH 14.3 a 1:1 complexation occurs between osmium(VIII) and osmium(VI). The equilibrium constants and molar extinction coefficients calculated by these methods were found to be consistent with the parameters obtained from the reduction of osmium tetroxide by primary alcohols at pH 14.3. The formation of a mixed oxidation state dimeric osmium complex (denoted Os2(VII)) has been proposed. Key words: Spectrophotometric techniques, osmium tetroxide, osmium(VIII), primary alcohols, osmium(VI).

Call number: LD2668 .T4 1965 M36 / Master of Science

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LD2668 .T4 1949 P62 / Master of Science

by Ho Wai-ngan Sandra. / Thesis (M.Phil.)--Chinese University of Hong Kong, 1993. / Includes bibliographical references (leaves 197). / ACKNOWLEDGMENT / ABSTRACT / Chapter CHAPTER 1 --- GENERAL INTRODUCTION --- p.1 / REFERENCES --- p.8 / Chapter CHAPTER 2 --- BRIEF REVIEW OF THE ANALYTICAL METHOD FOR THE DETERMINATION OF FORMALDEHYDE --- p.9 / Chapter 2.1 --- REVIEW OF SPECTROPHOTOMETRIC METHOD FOR THE DETERMINATION OF FORMALDEHYDE --- p.9 / Chapter 2.2 --- REVIEW OF CHROMATOGRAPHIC METHOD FOR THE DETERMINATION OF FORMALDEHYDE --- p.13 / Chapter 2.3 --- BASIC PRINCIPLES --- p.17 / REFERENCES --- p.20 / Chapter CHAPTER 3 --- SPECTROPHOTOMETRIC DETERMINATION OF FORMALDEHYDE --- p.21 / Chapter 3.1 --- INTRODUCTION --- p.21 / Chapter 3.2 --- EXPERIMENTAL --- p.24 / Chapter 3.3 --- RESULT AND DISCUSSION --- p.29 / Chapter 3.4 --- CONCLUSION --- p.58 / REFERENCES --- p.59 / Chapter CHAPTER 4 --- EFFECT OP COUNTER ANIONS AND CO-ANIONS IN ION INTERACTION CHROMATOGRAPHY --- p.60 / Chapter 4.1 --- INTRODUCTION --- p.60 / Chapter 4.2 --- EXPERIMENTAL --- p.73 / Chapter 4.3 --- RESULTS AND DISCUSSION --- p.78 / Chapter 4.4 --- CONCLUSION --- p.150 / REFERENCES --- p.151 / Chapter CHAPTER 5 --- CHROMATOGRAPHIC DETERMINATION OF FORMALDEHYDE --- p.153 / Chapter 5.1 --- INTRODUCTION --- p.153 / Chapter 5.2 --- EXPERIMENTAL --- p.154 / Chapter 5.3 --- RESULTS AND DISCUSSION --- p.158 / Chapter 5.4 --- CONCLUSION --- p.187 / REFERENCES --- p.188 / "APPENDIX OCCURENCE, TOXICOLOGY & BIOCHEMISTRY OF FORMALDEHYDE" --- p.188 / Chapter A1 --- INTRODUCTION --- p.188 / Chapter A2 --- OCCURENCE --- p.188 / Chapter A3 --- BIOCHEMISTRY --- p.192 / Chapter A4 --- TOXICOLOGY --- p.193 / REFERENCES --- p.197 / LEGENDS FOR FIGURES / LEGENDS FOR TABLES

Fung Wai-kwong. / Thesis (M.Phil)--Chinese University of Hong Kong, 1990. / Bibliography: leaves 86-88. / ACKNOWLEDGEMENT / ABSTRACT --- p.1 / Chapter PART I. --- INTRODUCTION --- p.3 / Chapter 1.1 --- General introduction --- p.3 / Chapter 1.2 --- Brief review of the derivative --- p.5 / spectrophotometric method / Chapter PART II. --- IDENTIFICATION OF TETRACYCLINES --- p.13 / Chapter 2.1 --- Introduction --- p.13 / Chapter 2.2 --- Experimental --- p.14 / Chapter 2.3 --- Results and discussion --- p.16 / Chapter 2.4 --- Conclusion --- p.20 / Chapter PART III. --- QUANTITATIVE DETERMINATION OF TETRACYCLINES AND RELATED DRUGS --- p.28 / Chapter 3.1 --- Introduction --- p.28 / Chapter 3.2 --- Experimental --- p.30 / Chapter 3.3 --- Results and discussion --- p.38 / Chapter 3.4 --- Conclusion --- p.82 / References --- p.86

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Vita. / Digitized by Kansas Correctional Industries

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