Dynamics of the triplet state of a dithiophene in different solid matrixes studied by transient and pulse EPR techniques

被引：19

作者：

Barbon, A

Bortolus, M

Brustolon, M

Comotti, A

Maniero, AL

Segre, U

Sozzani, P

机构：

[1] Univ Padua, Dipartimento Chim Fis, I-35131 Padua, Italy

[2] Univ Milan, Dipartimento Sci Mat, I-20125 Milan, Italy

[3] Univ Modena, Dipartimento Chim, I-41100 Modena, Italy

来源：

JOURNAL OF PHYSICAL CHEMISTRY B | 2003年 / 107卷 / 14期

关键词：

D O I：

10.1021/jp026214f

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 photoexcited triplet state of a 4-4'-disubstituted dithiophene has been investigated by time-resolved electron paramagnetic resonance in two different solid matrixes-glassy toluene which acts as an amorphous isotropic medium and a spirocyclophosphazene inclusion compound-which provides an ordered confining structure to the guest molecules. Different spectral line shapes with different temperature dependence have been obtained using continuous-wave or spin-echo detection. This behavior was attributed to spin relaxation due to modulation of the zero-field splitting tensor induced by fast librational motion of the dithiophene triplet. Moreover, differences between line shapes in the two matrixes were reproduced considering a librational motion occurring preferentially around different molecular axes.

引用

页码：3325 / 3331

页数：7

共 48 条

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