TRIPLET SPIN ALIGNMENT OF STRETCHED PORPHYCENES

被引：13

作者：

BERMAN, A

LEVANON, H

VOGEL, E

JUX, N

机构：

[1] HEBREW UNIV JERUSALEM,FARKAS CTR LIGHT INDUCED PROC,IL-91904 JERUSALEM,ISRAEL

[2] UNIV COLOGNE,INST ORGAN CHEM,W-5000 COLOGNE 41,GERMANY

来源：

CHEMICAL PHYSICS LETTERS | 1993年 / 211卷 / 06期

关键词：

D O I：

10.1016/0009-2614(93)80141-B

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 states of 22pi and 26pi acetylene-cumulene porphycenes (''stretched porphycenes'') were investigated by time-resolved continuous wave electron paramagnetic resonance spectroscopy. Experiments were carried out in isotropic (toluene) and anisotropic (a nematic liquid crystal) matrices. These porphyrinoid compounds exhibit a red-shift in the absorption spectra as a function of molecular length and compared to the 18pi porphycene. On the other hand, the zero-field splitting parameter, D, does not exhibit a dependence on the molecular length. This anomaly is interpreted in terms of the sign and magnitude of D, resulting from triplet spin alignment in the molecular plane.

引用

页码：549 / 554

页数：6

共 8 条

[1] MONOMERIC BACTERIOCHLOROPHYLL IS REQUIRED FOR THE TRIPLET ENERGY-TRANSFER BETWEEN THE PRIMARY DONOR AND THE CAROTENOID IN PHOTOSYNTHETIC BACTERIAL REACTION CENTERS [J].