Novel coordination of a hydroxamic acid
1987; Elsevier BV; Volume: 162; Issue: 3-4 Linguagem: Inglês
10.1016/0022-2860(87)87062-x
ISSN1872-8014
AutoresTuula T. Pakkanen, Tapani A. Pakkanen, Kimmo Smolander, David A. Brown, W.K. Glass, Andrew L. Roche,
Tópico(s)Lanthanide and Transition Metal Complexes
ResumoThe structures of two glycinohydroxamoto (GHA) complexes of Ni(II) and Co(III) have been determined by single-crystal X-ray diffraction methods. The crystals of Ni(GHA)2 are monoclinic with a = 5.360(1), b = 7.315(4), c = 10.194(4) Å, β = 96.57(3)∘, Z = 2, and space group P21/c. The crystals of Co(GHA)3•12 H2O are monoclinic with a = 22.467(19), b = 8.041(4), c = 13.700(11) Å, β = 116.01(7)∘, Z = 8, and space group C2/c. The values of the final residuals R for Ni(GHA)2 and Co(GHA)3•12 H2O are 0.0275 and 0.032, respectvely. The molecular structures of Ni(GHA)2 and Co(GHA)3 consist of a square planar and an octahedral coordination, respectively, with the glycinohydroxamato (NH2CH2CONOH−) ligands coordinating to the metal ion via the N (amino) and the N (NOH−). These two complexes are the first well-established cases of coordination of the NHO− group of a hydroxamic acid to a transition metal via the nitrogen atom.
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