Influence of Hindered Molecular Structure on Luminesence Behavior of 2,4,6-Triphenyl Pyrylium Salt

Abstract

Abstract: The photophysical properties of 2,4,6-triphenyl pyrylium salts(compounds 1 and 2) were investigated.It was found that the intramolecular charge transfer in excited state of compound 2,in which the rotation of 4-phenyl is hindered,is stronger than that of compound 1,in which the rotation of 4-phenyl is free.The quantum yields of compound 1 increased with increasing viscosity of solvents,while the quantum yields of compound 2 decreased under the same condition.It was also shown that the hindered rotation of 4-phenyl in the molecule of 2,4,6-triphenyl pyrylium salt is unfavorable to its fluorescence emission.

Key words: Pyrylium salt, Hindered rotation, Intramolecular charge transfer, Fluorescence emission

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CHEN Yi, WU Shi-Kang. Influence of Hindered Molecular Structure on Luminesence Behavior of 2,4,6-Triphenyl Pyrylium Salt[J]. Chem. J. Chinese Universities, 1996, 17(10): 1622.

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Influence of Hindered Molecular Structure on Luminesence Behavior of 2,4,6-Triphenyl Pyrylium Salt

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