Weakly conjugated bacteriochlorin-bacteriochlorin dyad: Synthesis and photophysical properties

Dyads containing two near-infrared absorbing and emitting bacteriochlorins with distinct spectral properties have been prepared characterized by absorption, emission, transient-absorption spectroscopies. The dyads exhibit ultrafast ([Formula: see text]3 ps) energy transfer from the bacteriochlorin higher-energy S 1 state to at longer wavelength. strong fluorescence relatively long excited lifetimes text]4 ns) in both non-polar polar solvents, which indicates negligible photoinduced electron between dyads. These are thus attractive for development of light-harvesting arrays fluorophores vivo bioimaging.