IR-LD-spectral study on the self-association effects of 2-aminopyridine

The IR-linear dichroic (LD) spectral study of 2-aminopyridine, dissolved an d oriented in a nematic liquid crystal mixture, is accomplished in order to clarify the kind of solute-solute hydrogen bond interaction. The formation of head-to-tail open associates in 2-aminopyridine solution is proved by t he reduction subtracting procedure applied to the polarized and unpolarized spectra. The comparative IR-LD study of oriented 2-aminopyridine samples i n the solid state, when the stabilization of a cyclic dimeric structure tak es place, is in accordance with the upper conclusion. (C) 1999 Elsevier Sci ence B.V. All rights reserved.