PH-SENSITIVE EXCITON CHIRALITY CHROMOPHORE - SOLVATOCHROMIC EFFECTS ON CIRCULAR-DICHROISM SPECTRA

Diesters (1 and 3) of (1S,2S) and (1R,2R)-cyolohexanediol and diamides (2 and 4) of(1S,2S) and (1R,2R)-diaminocyclohexane with p-hydroxycinn amic acid exhibit intense bisignate circular dichroism spectra in CH3O H: 1 Delta epsilon+55 (323 nm), -34 (287 nm); 2 Delta epsilon+75 (318 nm), -55 (281 nm) and in (CH3)(2)SO: 1 Delta epsilon+53 (328 nm), -33 (292 nm); 2 Delta epsilon+65 (319 nm), -50 (280 nm). Added NaOH causes a bathochromic shift of similar to 50 nm in CH3OH and similar to 80-9 0 nm in (CH3)(2)SO. Copyright (C) 1996 Elsevier Science Ltd