FOURIER TRANSFORM-INFRARED SPECTRA AND MOLECULAR-ORIENTATION IN THIN LANGMUIR-BLODGETT-FILMS OF DODECYLOXYPHENYLPYRAZINE CARBOXYLIC-ACID AND ITS BARIUM SALT

被引：6

作者：

KAMATA, T ^{[1
]}

UMEMURA, J ^{[1
]}

TAKENAKA, T ^{[1
]}

TAKEHARA, K ^{[1
]}

ISOMURA, K ^{[1
]}

TANIGUCHI, H ^{[1
]}

机构：

[1] KYUSHU UNIV,FAC ENGN,DEPT APPL CHEM,FUKUOKA 812,JAPAN

来源：

JOURNAL OF MOLECULAR STRUCTURE | 1990年 / 240卷

关键词：

D O I：

10.1016/0022-2860(90)80509-I

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Fourier transform-infrared transmission and reflection-absorption (RA) spectra have been measured for Langmuir-Blodgett (LB) films, 1 to 11 monolayers thick, of 5-(p-dodecyloxyphenyl) pyrazine-2-carboxylic acid (DOPC) and its barium salt. Spectral changes occur in DOPC with reduction in temperature, suggesting the coexistence of the cis and trans isomers for the N(1)C(2) bond in the pyrazine ring and the CO bond of the carboxyl group. The enthalpy difference between the two isomers was calculated as 160 cal mol-1. By comparing the intensities of major absorption bands in the transmission and RA spectra, orientation angles of the transition moments were evaluated. The molecular orientation of DOPC in the LB films was found to be independent of the number of monolayers, and also unaltered by conversion to the barium salt. This suggests that the molecular orientation is mainly governed by and intermolecular interaction between the adjacent phenyl-pyrazine chromophores. © 1990.

引用

页码：187 / 199

页数：13

共 31 条

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