Spectral Studies of H-Aggregate of D-π-A Molecule

Abstract

Abstract: D-π-Amolecules bearing strong electron donor and acceptor, 5-(4-N,N-dimethyl amino-benzylidene)-(1H,3H)-2,4,6-pyrimidinetrione(AB₁) and 5-(4-N,N-dioctadecylaminobenzylidene)-(1H,3H)-2,4,6-pyrimidinetrione(AB₁₈) were synthesized and their spectral properties were investigated. For AB₁ and AB₁₈, their UV-visible absorption spectra in cyclohexane and surface photovoltage spectra show peaks at 450 nm due to the formation of H-aggregate, which underwent a blue-shift about 30 nm than that of monomer intramolecular charge transfer(ICT) band in chloroform. The fluorescence emission band of excimer of H-aggregate in solid and at a high concentration in chloroform solution occurs at 620 nm and near 610 nm, respectively. The band at 620 nm underwent a red-shift about 3000 cm^-1 than that of monomer. In addition, intermolecularπ-π interactions of such D-π-Amolecules possesing strong electron donor and acceptor are discussed.

Key words: D-π-A molecules, H-aggregate, Excimer, Fluorescence emission spectra, ICT excited state

CLC Number:

O641

TrendMD:

CHEN Si-Guang, JIANG Yue-Shun, LU Ran, YANG Wen-Sheng, YANG JI-Hua, LI Tie-Jin, DU Zu-Liang. Spectral Studies of H-Aggregate of D-π-A Molecule[J]. Chem. J. Chinese Universities, 2001, 22(2): 245.

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Spectral Studies of H-Aggregate of D-π-A Molecule

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