Interaction of Electron-Accepting Vapors with Phthalocyanine and Related-Compounds - a Novel Calorimetric Study

Weaver, Roger C. and Wright, John D. (1991) Interaction of Electron-Accepting Vapors with Phthalocyanine and Related-Compounds - a Novel Calorimetric Study. Sensors and Actuators B: Chemical, 4 (3-4). pp. 505-510. ISSN 0925-4005. (The full text of this publication is not available from this repository)

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Official URL
http://dx.doi.org/10.1016/0925-4005(91)80159-H

Abstract

Heats of interaction of nitrogen dioxide with thin films of copper and lead phthalocyanine (CuPc and PbPc) and tetraazadibenzo[14]annulene (TADA) have been studied using a novel interferometric fibre-optic microcalorimeter. For CuPc the heat is consistent with weak chemisorption on a film composed of microcrystals of dimensions smaller than the film thickness of 700 angstrom. Comparison of simultaneous studies of the rates of heat evolution and electrical conductivity change for CuPc films at ambient temperature following exposure to NO2 shows that the conductivity change is substantially slower than the initial adsorption process. PbPc and TADA films react with NO2 (3 mbar) undergoing oxidative ring cleavage with partial nitration, with release of heats in excess of 800 kJ mol-1 in some cases, although these reactions do not always occur immediately following exposure to the gas. These results are discussed in the context of the use of such materials as semiconducting gas-sensing films.

Item Type: Article
Subjects: Q Science > QD Chemistry
Divisions: Faculties > Science Technology and Medical Studies > School of Biosciences
Depositing User: P. Ogbuji
Date Deposited: 04 Oct 2009 18:10
Last Modified: 25 Jun 2014 14:00
Resource URI: http://kar.kent.ac.uk/id/eprint/22789 (The current URI for this page, for reference purposes)
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