Spectroscopic, Electrochemical, and Photochemical Studies of Self-Assembled via Axial Coordination Zinc Porphyrin−Fulleropyrrolidine Dyads

Autor:	Melvin E. Zandler, Francis D'Souza, Asiri B. Perera, Michael J. VanStipdonk, Vu T. Hoang, Osamu Ito, Gollapalli R. Deviprasad, Mohamed E. El-Khouly, Mamoru Fujitsuka, Arkady Klykov
Rok vydání:	2002
Předmět:	chemistry.chemical_classification Supramolecular chemistry chemistry.chemical_element Electron donor Zinc Electron acceptor Photochemistry chemistry.chemical_compound chemistry Stability constants of complexes Pyridine Proton NMR Imidazole Physical and Theoretical Chemistry
Zdroj:	The Journal of Physical Chemistry A. 106:3243-3252
ISSN:	1520-5215 1089-5639
DOI:	10.1021/jp013165i
Popis:	Spectroscopic, redox, and photochemical behavior of self-assembled donor−acceptor dyads formed by axial coordination of zinc tetraphenylporphyrin, (TPP)Zn, and fulleropyrrolidine bearing either pyridine or imidazole coordinating ligands were investigated. The UV−vis, 1H NMR, and ESI-mass spectral studies, as well as computational studies, revealed supramolecular 1:1 dyad formation between the electron donor [(TPP)Zn] and the electron acceptor, fulleropyrrolidine entities. The determined formation constant K values followed the order o-pyridyl ≪ m-pyridyl ≃ p-pyridyl ≪ N-phenyl imidazole entities of the fulleropyrrolidine. The evaluated thermodynamic parameters revealed stable complexation with complex dissociation enthalpies ranging between 26 and 32 kJ mol-1. The 1H NMR studies revealed axial coordination of the pyridine or imidazole ligands to the central zinc of (TPP)Zn, while the ESI-Mass spectral studies performed in CH2Cl2 matrix revealed the expected molecular ion peak of the self-assembled dyads. ...
Databáze:	OpenAIRE
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