Synthesis and x-ray structural characterization of Cu(I) and Cu(II) derivatives of a new symmetric tripodal ligand N(CH2CH2-py)3, (py = 2-pyridyl)
1982; Elsevier BV; Volume: 64; Linguagem: Inglês
10.1016/s0020-1693(00)90334-7
ISSN1873-3255
AutoresKenneth D. Karlin, Jon C. Hayes, John P. Hutchinson, J. Hyde, Jon Zubieta,
Tópico(s)Metal-Catalyzed Oxygenation Mechanisms
ResumoTo discuss the relationship between the structure and the oxygen reduction reaction (ORR) activity of pyridylmethylamine copper complexes containing carboxy groups, CuII complexes of a N,N-bis(2-pyridylmethyl)phenylmethylamine tridentate ligand (L1) or its carboxy derivatives (2-{[bis(2-pyridylmethyl)amino]methyl}benzoic acid: L2, 3-{[bis(2-pyridylmethyl)amino]methyl}benzoic acid: L3, or 4-{[bis(2-pyridylmethyl)amino]methyl}benzoic acid: L4) were synthesized and characterized. The X-ray crystal structures of mononuclear CuII complexes ligated by L2–L4 were obtained as dichloride complexes, and a crystallographic analysis revealed that all of them have a square pyramidal geometry. The ESR spectroscopy showed that these complexes also had a square pyramidal geometry in a neutral aqueous solution. Cyclic voltammetry analysis in a neutral aqueous solution suggested that only the CuII complex of L2 shows intramolecular interaction between the carboxy group and copper ion in the aqueous solution. The introduction of a carboxy group dramatically increased the amount of the CuII complexes adsorbed on carbon black, which can slightly increase the ORR activity.
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