Abstract
Triplet state characteristics of monomer and dimer of two core modified thiaporphyrins (STPPS and S2TPPS) are reported. Introduction of heavy sulfur atom(s) into the porphyrin core does not alter the zero-field splitting parameters significantly and the ESP pattern remains the same as in analogous H2TPPS. This is possibly due to similarities in the structures of the porphyrin core of STPPS, S2TPPS and H2TPPS. However, there is a strong dimerization effect on the D value similar to those observed for dimerization of H2TPPS.
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