THERMODYNAMIC PROPERTIES OF SELF-ASSOCIATION OF PHOTOGRAPHIC SPECTRAL SENSITIZING CYANINE DYES 1. DIMERIZATION OF 3,3’-DI-(r-SULFOPROPYL)-9-ETHYL-4,5,4’5’- DIBENZOTHIA-CARBOCYANINE DYE IN DMF-WATERMIXED SOLVENTS AND HEAT OF DIMERIZATIONMEAS

doi:10.7517/j.issn.1674-0475.1989.03.40

Imaging Science and Photochemistry ›› 1989, Vol. 7 ›› Issue (3): 40-45.DOI: 10.7517/j.issn.1674-0475.1989.03.40

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THERMODYNAMIC PROPERTIES OF SELF-ASSOCIATION OF PHOTOGRAPHIC SPECTRAL SENSITIZING CYANINE DYES 1. DIMERIZATION OF 3,3’-DI-(r-SULFOPROPYL)-9-ETHYL-4,5,4’5’- DIBENZOTHIA-CARBOCYANINE DYE IN DMF-WATERMIXED SOLVENTS AND HEAT OF DIMERIZATIONMEAS

GONG YONG-KUAN, SHEN JIE-RU, ZHONO GUANG-XUE, ZHANG ZU-XUN

Chemistry Department, the Northwest University, Xian 710069, P. R. China

Received:1988-04-23 Revised:1988-11-16 Online:1989-08-20 Published:1989-08-20

Abstract

Abstract: The absorption spectra of 3, 3’-di-(γ-sulfopropyl) -9-ethyl-4,5,4’,5’-dibenzothia-carbocyani ne triethylamine salt (I) in DMF-H₂O mixed solvvents of various compositions showed dimer-mo-nomer equilibrium at room temperature within a certain concentration range. For these solutions, the dilution heat effects were measured with the home-made Versatile Precision Semiconductor Calorimetric System made in this laboratory. Dimerization enthalpy △H, △G and △S, which for 1 mole dimer formation at 25℃ in solvents of 45% and 35% DMF (by volume), were found to be: -(49.6±1.3), -(36.0±1.0)kJ;- (13.1±0.1),-(19.9±0.1) kJ and -(122.7±3.2),-(54.0±1.5)J·K^-1 respectively.

Key words: cyanine, photographic spectral sensitizing dye, enthalpy of dimerization, self association

GONG YONG-KUAN, SHEN JIE-RU, ZHONO GUANG-XUE, ZHANG ZU-XUN. THERMODYNAMIC PROPERTIES OF SELF-ASSOCIATION OF PHOTOGRAPHIC SPECTRAL SENSITIZING CYANINE DYES 1. DIMERIZATION OF 3,3’-DI-(r-SULFOPROPYL)-9-ETHYL-4,5,4’5’- DIBENZOTHIA-CARBOCYANINE DYE IN DMF-WATERMIXED SOLVENTS AND HEAT OF DIMERIZATIONMEAS[J]. Imaging Science and Photochemistry, 1989, 7(3): 40-45.

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THERMODYNAMIC PROPERTIES OF SELF-ASSOCIATION OF PHOTOGRAPHIC SPECTRAL SENSITIZING CYANINE DYES 1. DIMERIZATION OF 3,3’-DI-(r-SULFOPROPYL)-9-ETHYL-4,5,4’5’- DIBENZOTHIA-CARBOCYANINE DYE IN DMF-WATERMIXED SOLVENTS AND HEAT OF DIMERIZATIONMEAS

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