Physicochemical insights in non-covalent interaction of a newly designed triporphyrin with fullerenes C_60 and C_70 in solution

摘要

The present paper reports the synthesis of free-base (H_2-1) and zinc-triporphyrins Zn-1, and their supramolecular complexes with C_(60) and C_(70) in toluene. While UV-Vis studies reveal ground state interaction between fullerenes and triporphyrins, steady state fluorescence measurements establish quenching of fluorescence of triporphyrins by fullerenes. Binding constants data evoke that Zn-1 may be employed as an efficient tweezers for C_(70) in toluene. Time resolved emission studies establish relatively long-lived charge separated state for the C_(70)/triporphyrin complexes. Molecular mechanics force field calculations in vacuo interpret the stability difference between C_(60)/and C_(70)/complexes of triporphyrin.