Date of Award

1-1-2001

Thesis Type

Masters

Document Type

Thesis

Divisions

Faculty of Science

Department

Department of Chemistry

Institution

Universiti Malaya

Abstract

Copper(II) benzoate, copper(II) 4-fluorobenzoate, copper(II) 4-chlorobenzoate, copper(II) 4-bromobenzoate, copper(II) 4-iodobenzoate, copper(II) pentafluoro benzoate, copper(II) 4-nitrobenzoate and copper(II) 3,5-dinitrobenzoate are potential low dimensional thermally stable molecular electronics. The them1al properties of these samples are investigated by thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC). TGA reveals that copper(II) benzoate (CB) slowly decomposed at 243.5°C, losing 67.7% of its weight at 515°C. The DSC shows two endotherms separated by an exotherm. The first endotherm at 224°C may due to the breaking of bridging bond to give benzoyloxy radicals. The exotherm at 231°C may due to the formation of volatiles from the decomposition of benzoyloxy radical formed. The final endothenn at 278°C may be due to the breaking of copper•copper bond before the material decomposed completely to compounds of copper(II) such as copper(ll) oxide. Derivatives of CB containing electron•attracting groups, namely fluoro, chloro, bromo, iodo, pentafluoro, nitro and dinitro have higher decomposition temperatures than CB, ranging from 313°C to 334°C. The dinitro derivative is the most thermally stable while the pentafluoro derivative is the least. The decomposition pattern of the derivatives are similar to CB, and may be similarly explained.

Initial

snms

Additional Information

Dissertation (M.A) -- Faculty of Science, Universiti Malaya, 2001.

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