Synthesis and photophysical properties of “center-to-edge” type phosphorus(V) porphyrin arrays

Abstract

The synthesis, characterization and photophysical properties of a series of “center-to-edge” type phosphorus(V) porphyrin arrays in which the central phosphorus atom of one phosphorus(V) porphyrin is connected to the meso-phenoxy edge of the other phosphorus(V) porphyrin(s) are described. The conformation of the porphyrin arrays is estimated from the NMR data on the basis of the porphyrin ring current model. From the structural assignments and absorption properties of the arrays it is suggested that the electronic coupling between the porphyrin rings in the arrays is small. Nevertheless, solvent-polarity dependence of the excited-state properties indicates an enhancement of the nonradiative decay via the charge transfer state.