Rotational Isomerization of (E)-(2-Anthryl) ethenes. A Consideration Why Are the s-cis Rotamers More Stable than the s-trans Rotamers in the Excited State and Less …

…, H Itoh, N Yoshikawa, A Kitamura, K Tokumaru

Index: Karatsu, Takashi; Itoh, Hajime; Yoshikawa, Nobuko; Kitamura, Akihide; Tokumaru, Katsumi Bulletin of the Chemical Society of Japan, 1999 , vol. 72, # 8 p. 1837 - 1849

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Citation Number: 9

Abstract

Rotational isomerism between s-cis and s-trans rotamers of (E)-1-(2-anthryl)-2- phenylethene (E-2APE) and (E)-1-(2-anthryl)-3, 3-dimethyl-1-butene (E-2ADB) were investigated by comparing the absorption, emission and transient absorption spectra with those of the model compounds. The s-trans isomer is more stable than the s-cis rotamer in the ground state; however, the s-cis isomer is more stable than the s-trans rotamer in the ...