Porphyrin analogs bearing exocyclic double bonds at meso-positions: bis(meso-diethylmalonylidene)-(1,4-naphthi)thiaporphyrin

摘要

meso-diethylmalonylidene-(1,4-naphthi)thiaporphyrin containing exocyclic C–C double bonds at meso-positions has been synthesized and characterized. The compound undergoes initial protonation at the α-position of the diethylmalonyl group with large red shifted absorption maxima. The second protonation occurs at a meso-position to give a species with broken cross-conjugation.