Physicochemical and Photophysical Studies on Porphyrin-Based Donor−Acceptor Systems: Effect of Redox Potentials on Ultrafast Electron-Transfer Dynamics
作者： D. Amilan Jose , Atindra D. Shukla , G. Ramakrishna , Dipak K. Palit , Hirendra N. Ghosh
DOI: 10.1021/JP0705830
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摘要: We report new polychromophoric complexes, where different porphyrin (P) derivatives are covalently coupled to a redox active Mo center, MoL*(NO)Cl(X) (L* is the face-capping tridentate ligand tris(3,5-dimethylpyrazolyl) hydroborate and X phenoxide/pyridyl/amido derivative of porphyrin). The luminescence quantum yields bichromophoric systems (1, 2, 5) were found be an order magnitude less than those their respective precursors. Transient absorption measurements revealed formation radical cation species (P•+) photoinduced electron transfer from moiety center in 1, 5. Electrochemical studies showed that reduction potentials acceptor centers newly synthesized pyridyl (2; E1/2[MoI/0] = ∼ −1.4 V vs Ag/AgCl) previously reported phenoxy- (1; E1/2[MoII/I] ∼ −0.3 amido- (3; ∼ −0.82 varied over wide range. Thus, stu...
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