Experimental and theoretical study of near-infrared absorbing naphthoquinone methide dyes with a nonplanar geometry
作者:Yuji Kubo、Katsuhira Yoshida、Masafumi Adachi、Shinichiro Nakamura、Shuichi Maeda
DOI:10.1021/ja00008a012
日期:1991.4
The bathochromic shift of the near-infrared absorption spectra of naphthoquinone methide dyes has been observed as a function of increased steric hindrance between the quinone imine and aniline segments. This novel shift that results from the loss of planarity has been examined by means of semiempirical INDO/S and AM1 models. Based on the configuration interaction (CI) analysis, the observed transitions in both the near-infrared and UV regions have been assigned. The introduction of an acetylamino group at the 2-position of aniline ring has caused a bathochromic shift with a remarkable increase in molecular extinction coefficient. In order to interpret these results, both an electronic factor and a steric effect have been analyzed. This interesting color-structure relationship of a nonplanar chromophoric system has been elucidated.