Add time:08/31/2019         Source:sciencedirect.com

The process of oxidative dehydrogenation of the pentadentate amine ligand 2,10-bis-(2′-pyridyl)-3,6,9-triazaundecane (L1am) mediated by Cu(II) in the absence of an external oxidant led to the Cu(I) mono-imine complex, [CuIL1im](BPh4). This complex was quite sensitive towards air oxidation, leading to the corresponding Cu(II) mono-imine complex. The complexes were characterized by C, H, N analysis, IR, NMR, and cyclic voltammetry. The structures of the Cu(II) mono-imine complexes, [CuIIL1im(X)](BPh4)2 (X = CH3COCH3, CH3SOCH3, or CH3CN), and of the Cu(II) amine complex [CuIIL1am](BPh4)(NO3), were solved by X-ray crystallography. These complexes carried each a Cu(II)N5 site, with five nitrogen atoms provided by either L1im (2 sp3 amino N, 1 sp2 imino N, 2 sp2 pyridine N), or L1am (3 sp3 amino N, 2 sp2 pyridine N). The Cu(II) promoted oxidative dehydrogenation of amine ligand L1am did not require an external base in contrast to related Fe(III)/Fe(II) systems.

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