4D-pi-1A type beta-substituted Zn-II-porphyrins: ideal green sensitizers for building-integrated photovoltaics

Two novel green beta-substituted Zn-II-porphyrins, G1 and G2, based on a 4D-pi-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.