@article{li_ambroise_yang_diers_seth_wack_bocian_holten_lindsey_1999, title={Template-directed synthesis, excited-state photodynamics, and electronic communication in a hexameric wheel of porphyrins}, volume={121}, ISSN={["0002-7863"]}, DOI={10.1021/ja991730d}, abstractNote={To investigate new architectures for molecular photonics applications, a shape-persistent cyclic hexameric architecture (cyclo-Zn3Fb3U-p/m) has been prepared that is comprised of three free base (Fb) porphyrins and three zinc porphyrins linked at the meso-positions via diphenylethyne units. The synthesis involves the Pd-mediated coupling of a p/p-substituted diethynyl Zn porphyrin and a m/m-substituted diiodo Fb porphyrin, forming p/m-substituted diphenylethyne linkages. The isolated yield of cyclo-Zn3Fb3U-p/m is 5.3% in the presence of a tripyridyl template. The array has C3v symmetry, 108 atoms in the shortest path, and a face-to-face distance of ∼35 A across the cavity. The excited-state lifetime of the Zn porphyrin in cyclo-Zn3Fb3U-p/m is 17 ps, giving a rate of energy transfer to each adjacent Fb porphyrin of ktrans = (34 ps)-1 and a quantum efficiency of Φtrans = 99.2%. This rate is comparable to that in a dimer (ZnFbU-p/m) having an identical linker, but slower than that of a p/p-linked ZnFb dimer,...}, number={38}, journal={JOURNAL OF THE AMERICAN CHEMICAL SOCIETY}, author={Li, JZ and Ambroise, A and Yang, SI and Diers, JR and Seth, J and Wack, CR and Bocian, DF and Holten, D and Lindsey, JS}, year={1999}, month={Sep}, pages={8927–8940} }