Effects of high magnetic field on the intramolecular exciplex fluorescence of chain-linked phenanthrene and dimethylaniline

被引：27

作者：

Cao, H ^{[1
]}

Miyata, K ^{[1
]}

Tamura, T ^{[1
]}

Fujiwara, Y ^{[1
]}

Katsuki, A ^{[1
]}

Tung, CH ^{[1
]}

Tanimoto, Y ^{[1
]}

机构：

[1] HIROSHIMA UNIV,FAC SCI,DEPT CHEM,HIGASHIHIROSHIMA 739,JAPAN

来源：

JOURNAL OF PHYSICAL CHEMISTRY A | 1997年 / 101卷 / 04期

关键词：

D O I：

10.1021/jp961542z

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：

The effects of high magnetic field (less than or equal to 13 T) on the intramolecular exciplex fluorescence generated from a chain-linked phenanthrene (Phen) and dimethylaniline (DMA) system (Phen-(CH2)(n)O(CH2)(2)-DMA, n = 4-12) were studied in N,N-dimethylformamide by means of photostationary and laser-induced fluorescence. With increasing the magnetic field from 0 to ca. 1 T, the exciplex fluorescence for the molecules with n = 6-12 increases steeply in intensity and then decreases gradually up to ca. 9 T. Their mean lifetimes exhibit similar magnetic field dependence (less than or equal to 13 T). The reversal of the effects is observed in high magnetic field (> 1 T). This is interpreted in terms of the Delta g mechanism in which a high magnetic field enhances the singlet-triplet intersystem crossing in an intramolecular Phen anion and DMA cation radical pair intervening in the reaction. The Delta g value is estimated to be about 0.000 022.

引用

页码：407 / 411

页数：5

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