The unexpected tridentate role of the tripodal ligand N-(carbamoylmethyl)iminodiacetato(2−) (ADA) in a new mixed-ligand nickel(II) complex with 2,2′-bipyridine (bipy) as secondary ligand: structure of [Ni(ADA)(bipy)(H2O)]·4H2O
作者： E Bugella-Altamirano , J.M González-Pérez , D Choquesillo-Lazarte , R Carballo , A Castiñeiras
DOI: 10.1016/S1387-7003(02)00552-X
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摘要: Abstract The crystal structure of a new mixed-ligand nickel(II) complex N-(carbamoylmethyl)iminodiacetato(2−) (ADA) and 2,2′-bipyridine (bipy), with formula [Ni(ADA)(bipy)(H2O)]·4H2O (compound 3), reveals an unexpected tridentate ADA ligand, free N-(2-amidomethyl) arm, in contrast all other known structures metal–ADA chelates which have ADA2− as tripodal–tetradentate ligand. This finding is explained on the basis structural comparison compounds [Ni(ADA)(H2O)2] (1) [ Ni ( )( Him H 2 O )]·1.5 (2, Him = imidazole) significant changes Ni–N(amino tertiary) Ni–O(amide) bond lengths well denticity ligand conformation concerning iminodiacetato(2−) moiety (IDA) these Ni(II) chelates. ADA-ligand mer-IDA + O(amide), fac-IDA + O(amide) or only fac-IDA-tridentate 1, 3 respectively.
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