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EDA complex stability constants and formation enthalpies in a binary liquid crystalline system with induced smectic phase
Author(s) -
Demus D.,
Hauser A.,
Pelzl G.,
Böttger U.,
Schönburg S.
Publication year - 1985
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.2170200314
Subject(s) - enthalpy , biphenyl , phase (matter) , chemistry , thermodynamics , charge (physics) , binary system , binary number , standard enthalpy of formation , organic chemistry , physics , arithmetic , mathematics , quantum mechanics
In the binary system 4,4′‐bis‐[n‐butylamino]‐biphenyl/‐(2,2‐dicyano‐ethenyl)‐phenyl 4‐n‐nonyloxybenzoate which due to EDA complex formation exhibits an induced S A phase, measurements of the charge transfer band, the molar volumina and transition enthalpies were done. By the concentration and temperature dependence, resp., of the charge transfer absorption and the strongly negative excess volumina we estimated the stability constant and the formation enthalpy of the complex. The data obtained by the two independent methods agree sufficiently.