Thieno-pyrrole-fused 4,4-difluoro-4-bora-3a,4a-diaza-s-indacene-fullerene dyads: utilization of near-infrared sensitizers for ultrafast charge separation in donor-acceptor systems.

Donor-acceptor dyads featuring near-IR sensitizers derived from thieno-pyrrole-fused BODIPY (abbreviated as SBDPiR) and fullerene, C60 have been newly synthesized and characterized. Occurrence of ultrafast photoinduced electron transfer (PET) leading to the formation of charge-separated state in these dyads, capable of harvesting light energy from the near-IR region, is established from femtosecond transient absorption studies.