A specific intramolecular interaction in a bis(2-thienyl)maleimide derivativeстатья
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Дата последнего поиска статьи во внешних источниках: 2 сентября 2014 г.
Аннотация:3,4-Bis(4-ethoxycarbonyl-3-hydroxy-5-methyl-2-thienyl)-1-phenyl-1H-pyrrole-2,5-dione shows no photochromism in the crystalline state, despite its typical “photochromic” structure (X-ray diffraction data): the anti-parallel orientation of the thienyl fragments relative to the plane of pyrrole-2,5-dione and a short distance between potential reactive sites (C(3′)...C(3′A), 3.27 Å). The absence of photochromism was explained by a specific attractive interaction between the O atoms of the maleimide ring and the thiophene S atoms, which can preclude UV-induced photocyclization.