ELECTRONIC STATES AND (PI,PI-STAR) ABSORPTION AND EMISSION CHARACTERISTICS OF STRONGLY COUPLED PORPHYRIN DIMERS - SANDWICH COMPLEXES OF HF(IV) AND SR(IV)

被引:53
作者
BILSEL, O [1 ]
BUCHLER, JW [1 ]
HAMMERSCHMITT, P [1 ]
RODRIGUEZ, J [1 ]
HOLTEN, D [1 ]
机构
[1] TH DARMSTADT,INST ANORGAN CHEM,W-6100 DARMSTADT,GERMANY
基金
美国国家卫生研究院;
关键词
D O I
10.1016/0009-2614(91)90100-N
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
Time-resolved and steady state optical measurements are reported for the sandwich complexes consisting of two tetraphenylporphyrin macrocycles held within 3 angstrom by either a Zr(IV) or Hf(IV) ion. Compared to monoporphyrins and weakly coupled bisporphyrins, the transition-metal sandwich complexes show new features in both the ground and excited state absorption spectra as well as a broad fluorescence red-shifted to almost-equal-to 1-mu-m. A model is presented that describes the electronic states responsible for these optical features. The states arise from strong interactions between the porphyrin macrocycles and contain significant charge resonance character.
引用
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页码:415 / 421
页数:7
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