A Study of Conformation Equilibrium and Interaction of Porphyrin Dimers

Abstract

Abstract: Aseries of porphyrin dimers and their zinc complex covalently linked with _O(CH₂)-nO_ chain were synthesized and characterized. Their steady state fluorescence spectra show the existence of intramolecular energy transfer processes in these free base porphyrin dimers. C₄free dimer has the greatest efficiency of energy transfer. By using IR and ¹HNMR methods, the relationship between the conformation equilibrium and the length of the alkoxyl chain, the metal complexation was studied. With the increase of the length of the chain, the conformation equilibrium of porphyrin dimers moves to the closed conformation, the chain length of C₄dimer was suitable to form the closed conformation. The metallation with zinc ion increases the magnitude of π-π interaction of two porphyrin rings while it does not affect the conformation equilibrium of porphyrin dimers.

Key words: Porphyrin dimer, Conformation equilibrium, NMR, Chemical shift

CLC Number:

O614.33

TrendMD:

REN Qi-Zhi, HUANG Jin-Wang, LIN Cui-Wu, JI Liang-Nian . A Study of Conformation Equilibrium and Interaction of Porphyrin Dimers[J]. Chem. J. Chinese Universities, 1999, 20(3): 333.

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A Study of Conformation Equilibrium and Interaction of Porphyrin Dimers

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