TEMPERATURE AND SOLVENT DEPENDENCES OF THE ZERO-FIELD SPLITTINGS AND CHARACTER OF THE TRIPLET-STATES OF METHYLPYRAZINES

被引：6

作者：

KAMEI, T ^{[1
]}

TERAZIMA, M ^{[1
]}

YAMAUCHI, S ^{[1
]}

HIROTA, N ^{[1
]}

机构：

[1] KYOTO UNIV,FAC SCI,DEPT CHEM,KYOTO 606,JAPAN

来源：

JOURNAL OF PHYSICAL CHEMISTRY | 1994年 / 98卷 / 33期

关键词：

D O I：

10.1021/j100084a008

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：

Temperature and solvent dependences of the zero-field splittings (zfs) of the excited triplet states of methylpyrazines are investigated. There seems to be a correlation between the temperature dependence of the zfs and that of the triplet decay. The zfs varies markedly with temperature in the systems in which the triplet decay rate constants increase rapidly at relatively low temperatures. A detailed study of the temperature dependence of the zfs of 2,6-dimethylpyrazine (DMP) indicates the presence of a (3) pi pi(*) state in the vicinity of the T-1(n pi(*)) state. Solvent dependence of the zfs was studied in the case of DMP and trimethylpyrazine(TMP). In nonpolar solvents the T-1 state of DMP is 3n pi(*) in character, but in TMP the T-1 state has dominant pi pi(*) character.

引用

页码：7963 / 7966

页数：4

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[2]

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