EDA complex stability constants and formation enthalpies in a binary liquid crystalline system with induced smectic phase

Abstract

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.