4D–π–1A type β-substituted ZnII-porphyrins: ideal green sensitizers for building-integrated photovoltaics

Abstract

Two novel green β-substituted Zn^II-porphyrins, G1 and G2, based on a 4D–π–1A type substitution pattern have been synthesized. Their enhanced push–pull character, by reduction of H–L energy gaps, promotes broadening and red-shifting of absorption bands. The effective synthetic pathway and the remarkable spectroscopic properties make G2 ideal for BIPV application.