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[摘要]：Porphyrins, which consist of four pyrrolic subunits, are a ubiquitous class of naturally occurring compd. with versatile photophys. properties. As an extension of the basic structure of the porphyrin macrocycle, there have been a multitude of approaches to synthesize expanded porphyrins with more than four pyrrole rings, leading to the modification of the macrocyclic ring size, planarity, no. of p-electrons and aromaticity. However, the relationship between the photophys. properties and the structures of expanded porphyrins has not been systematically investigated. The main purpose of this article is to describe the structure-property relationships of a variety of expanded porphyrins based on exptl. and theor. results, which include steady-state and time-resolved spectroscopic characterizations, non-linear absorption ability and nucleus-independent chem. shift calcns. |
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