MODELS FOR THE PHOTOSYNTHETIC REACTION CENTER - SYNTHESIS AND STRUCTURE OF PORPHYRIN DIMERS WITH CIS-ETHENE AND TRANS-ETHENE AND SKEWED HYDROXY-METHYLENE BRIDGES
Mo. Senge et al., MODELS FOR THE PHOTOSYNTHETIC REACTION CENTER - SYNTHESIS AND STRUCTURE OF PORPHYRIN DIMERS WITH CIS-ETHENE AND TRANS-ETHENE AND SKEWED HYDROXY-METHYLENE BRIDGES, Angewandte Chemie, International Edition in English, 32(5), 1993, pp. 750-753
TiCl3-induced coupling of meso-formylporphyrins provides cofacial porp
hyrin dimers such as 1 (M = Cu, Ni) with bridging CH = CH units. These
compounds show strong interactions between the porphyrin rings; in th
e case of M = Ni, the dimer can be easily transformed into the corresp
onding trans isomer. Similar reactions with beta-formylporphyrins lead
to a third type of dimer, a skewed hydroxymethylene-bridged bisporphy
rin. These dimeric compounds are models for the photosynthetic reactio
n center and should facilitate studies on the influence of the dimer g
eometry on the photophysical properties.