Excited-state Intramolecular Proton Transfer and Spectroscopy of 2-(2'-Hydroxy phenyl) benzoxazole in Solid Polymer Matrices

Abstract

Abstract: This paper first reports the spectroscopy and the properties of excited-state intramolecular proton transfer(ESIPT) of 2-(2'-hydroxy phenyl) benzoxazole(HBO) in some solid polymer matrices and the matix effects on them,The results show that;(1) The properties of ESIPTand spectra of HBOin the non-polar and weak polar polymer matrices would not be modified compared with those in the solution systems.The matrices,on the other hand,could improve the quantum yield of ESIPTfluorescence,(2) The polymer matrices with strong H-bonding activity and polarity can modify the spectra and the ESIPTefficiency of HBOdue to the formation of H-bonding complex between HBOand the matrix,which,however,could be eliminated effectively by using a special micelle method to isolate HBOfrom the matrices.(3) Thermodynamic equilibrium of the ground state rotamers of HBOin the solid polymer matrices seems to have a tendency which is unfavourable to the formation of the rotamer Ⅰ and Ⅲ.

Key words: 2-(2'-Hydroxy phenyl)benzoxazole, Proton transfer, Electronic spectra, Solid polymer matrix

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TANG Guo-Qing, SHANG Xiao-Ming, ZHANG Gui-Lan, DU Rong-Jian, CHEN Wen-Ju. Excited-state Intramolecular Proton Transfer and Spectroscopy of 2-(2'-Hydroxy phenyl) benzoxazole in Solid Polymer Matrices[J]. Chem. J. Chinese Universities, 1996, 17(6): 906.

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Excited-state Intramolecular Proton Transfer and Spectroscopy of 2-(2'-Hydroxy phenyl) benzoxazole in Solid Polymer Matrices

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