STRUCTURES OF TRANSIENT SPECIES IN THE PHOTOCHROMIC REACTION OF 1',3',3'-TRIMETHYLSPIRO[2H-1-BENZOPYRAN-2,2'-INDOLINE] - TIME-RESOLVED RESONANCE RAMAN-STUDY OF ISOTOPICALLY SUBSTITUTED ANALOGS

被引：3

作者：

YUZAWA, T ^{[1
]}

EBIHARA, K ^{[1
]}

HIURA, H ^{[1
]}

OHZEKI, T ^{[1
]}

TAKAHASHI, H ^{[1
]}

机构：

[1] WASEDA UNIV,SCH SCI & ENGN,DEPT CHEM,TOKYO 169,JAPAN

来源：

SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY | 1994年 / 50卷 / 8-9期

关键词：

D O I：

10.1016/0584-8539(94)E0059-J

中图分类号：

O433 [光谱学];

学科分类号：

0703 ; 070302 ;

摘要：

Time-resolved resonance Raman spectra of seven kinds of isotopically substituted analogues of 1,'3',3'-trimethylspiro[2H-1-benzopyran-2,2'-indoline] in the photomerocyanine form have disclosed that only the vibrations of the cleaved benzopyran part are resonance enhanced significantly in cyclohexane and in acetonitrile solutions with 460-390 nm probe light. Dramatic changes in the resonance Raman spectra of the photomerocyanine on going from non-hydrogen-bond donor solvents to hydrogen-bond donor solvents can be interpreted as being due to changes in the relative contribution of ortho-quinoidal and zwitterionic forms in the resonance hybrid structure of the photomerocyanine: in cyclohexane and in acetonitrile the contribution of the ortho-quinoidal form is substantial, while in methanol the zwitterionic form is stabilized by hydrogen bonding with the solvent and the photomerocyanine takes an almost zwitterionic structure.

引用

页码：1487 / 1498

页数：12

共 11 条

[1] RAMAN-SPECTRA OF ISOTOPIC DERIVATIVES OF PARA-BENZOQUINONE - REVISED VIBRATIONAL ASSIGNMENTS [J].