TRIPLET ELECTRON-PARAMAGNETIC RESONANCE DETECTION OF PORPHYRINOIDS IN FLUID LIQUID-CRYSTALS AT ELEVATED-TEMPERATURES

被引：43

作者：

REGEV, A

LEVANON, H

MURAI, T

SESSLER, JL

机构：

[1] HEBREW UNIV JERUSALEM,FRITZ HABER RES CTR MOLEC DYNAM,IL-91904 JERUSALEM,ISRAEL

[2] ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439

[3] UNIV TEXAS,DEPT CHEM,AUSTIN,TX 78712

来源：

JOURNAL OF CHEMICAL PHYSICS | 1990年 / 92卷 / 08期

关键词：

D O I：

10.1063/1.457689

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 two porphyrinoids, H2TTP and a Cd complex of Texaphyrin (Cd-TxP), oriented in liquid crystals were examined by time-resolved electron paramagnetic resonance (EPR) spectroscopy as a function of temperature. The low probability of molecular tumbling in the liquid crystalline phase allows the detection of triplets by fast EPR, at temperatures (300 K) which are above the hosts' melting points, and where the fluid properties of the matrices are maintained. Line shape and kinetic analyses of the triplet spectra provide data on spin relaxation rates, interchromophore interactions, and on the dynamic behavior of the liquid crystalline hosts, driven by the external magnetic field. © 1990 American Institute of Physic.

引用

页码：4718 / 4723

页数：6

共 16 条

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