화학공학소재연구정보센터
Journal of the American Chemical Society, Vol.139, No.39, 13950-13956, 2017
Flattened Calixarene-like Cyclic BODIPY Array: A New Photosynthetic Antenna Model
A cyclic BODIPY array, characterized by a rigid flattened calixarene-like conformation, acts as a photosynthetic antenna mimic. The system in question, triBODIPY, is a better antenna than the corresponding BF2-free ligand. On the basis of absorption spectral studies and supporting calculations, it is concluded that exciton coupling between the BODIPY subunits occurs readily. TriBODIPY supports a complex with Li+@C-60 that bring an antenna-like light absorber into close proximity to an electronic acceptor without the need for linking spacers. As inferred from X-ray diffraction analyses of complexes between triBODIPY and C-60, it is inferred that the fullerene complexes are stabilized via convex concave donor acceptor interactions. Steady state absorption/fluorescence, time-correlated single photon counting, and transient absorption measurements have allowed a complete characterization of the complexes in both the ground and excited states, including the host-guest recognition features; fluorescence quenching effects, and charge separation/recombination dynamics.