ELECTRONIC SPECTRA OF DIANTHRYLOPOLY-YNES
Loading...
Date
1964
Journal Title
Journal ISSN
Volume Title
Publisher
Ohio State University
Abstract
Recently, Akiyama and Nakagawa reported that in $1, 1^{\prime}$-dianthrylpoly-ynes, $C_{14}H_{9}-(C\equiv C)_{n}-C_{14}H_{9}$, a fine linear relation was obtained by plotting the absorption maxima, $\lambda_{\max}$, of the longest wavelength absorption band against $n^{2} (\lambda_{\max}\propto n^{2})$, which forms a striking contrast with a well known relation that in the series of polyenes and poly-ynes the square of $\lambda_{\max}$ varies linearly with the number of the conjugated multiple bonds $(\lambda^{2}_{\max} \propto n)$. In order to elucidate this interesting relation, we have carried out some MO calculations on the electronic structures of 1,$1^{\prime}$-dianthrylpoly-ynes. According to the present theory the existence of $\lambda_{\max} \propto n^{2}$ relation indicates that the contribution of ionic configuration to the ground state of 1, $1^{\prime}$-dianthrylpoly-yne should linearly increase with increasing the number of triple bonds, n. The electronic spectra of 9, $9^{\prime}$-dianthrylpoly-ynes have also been studied theoretically.
Description
Author Institution: Mellon Institute; Osaka City University; Osaka University