EXCITED-STATE BEHAVIOR OF 1,2-DI(2-PYRIDYL)-1,2-ETHENEDIOL (ALPHA-PYRIDOIN) AND ITS BORIC-ACID COMPLEXES

被引:9
作者
GUDIPATI, MS
机构
[1] Institut für Physikalische Chemie-II, Universität zu Köln, D-50939 Köln
关键词
D O I
10.1021/j100135a012
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
A dihydroxy derivative of trans- 1,2-di-2-pyridylethene, alpha-pyridoin, which exists as a dialcohol, is a nonluminescent molecule in solution due to nonradiative deactivation of the excited species via torsional motions around the central C=C bond. Through the formation of a 1:2 complex with boric acid or by doping in trans-stilbene single crystals, these torsional motions were restricted, resulting in strong fluorescence from the alpha-pyridoin molecules. CNDO/S-SCI predictions of the excitation energies compare well with the observed values. The free dialcohol form shows fluorescence with normal (approximately 70-nm peak to peak) Stokes shift in the trans-stilbene host crystals. The role of excited-state intramolecular proton transfer (ESIPT) in the deactivation of the excited alpha-pyridoin molecules is small, based on the emission maxima and semiempirical calculations.
引用
收藏
页码:8602 / 8607
页数:6
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