Imaging Science and Photochemistry ›› 1989, Vol. 7 ›› Issue (4): 25-30.DOI: 10.7517/j.issn.1674-0475.1989.04.25

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THERMODYNAMIC PROPERTIES OF SELF-ASSOCIATION OF PHOTOGRAPHIC SPECTRAL SENSITIZING CYANINE DYES Ⅱ. J-AGGREGATE FORMATION OF 3,3’-DI-(r-SULFOPROPYL)-9-ETHYL-4,5,4’,5’-DIBENZOTHIA-CARBOCYANINE IN DMF-H2O MIXED SOLVENTS AND HEAT OF J-AGGREGATION MEA

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

  1. Chemistry Department, the Northwest University, Xian 710069, P.R. China
  • Received:1988-04-23 Revised:1988-11-16 Online:1989-11-20 Published:1989-11-20

Abstract: Results were reported for the study of J-aggregation of 3, 3’-di-(r-sulfopropyl)-9-ethyl-4, 5,4’,5’-dibenzothia-carbocyanine triethylamine salt (I) on adding KBr to its solutions in DMF-H2O mixed solvents, where only dimer monomer equilibrium of the dye existed. Heat effects of the mentioned mainly J-aggregate forming processes were measured directly and the J-aggregation enthalpy, △Hs, expressed as the mean aggregation enthalpy per monomer unit (i.e. the-average enthalpy change if one monomer is associated to a growing J-aggregate) was obtained. J-aggregation number was estimated to be 6.

Key words: cyanine, photographic spectral sensitizing dye, J-aggregates, enthalpy of aggregation