1983 Volume 56 Issue 12 Pages 3635-3641
The structures of mono(glycinato)nickel(II) and tris(glycinato)nickelate(II) complexes in aqueous solution were determined by the X-ray diffraction method. From the analysis of the radial distribution curve of solution A, in which the hexaaqua- and mono(glycinato)nickel(II) ions coexisted (the mole ratio Cgly/CNi=0.792, where Ci denotes the total concentration of species i), we found that the mono(glycinato)nickel(II) complex combined with four water molecules at the distance of (2.08±0.01) Å, the bond being longer than the Ni–OH2 bond (2.04 Å) within the [Ni(OH2)6]2+ ion. The Ni–O and Ni–N bond lengths within the mono(glycinato)nickel(II) complex were essentially the same and (2.09±0.02) Å. Therefore, the mono(glycinato)nickel(II) ion has a practically regular octahedral structure. The nonbonding Ni···C distance was also determined to be (2.87±0.02) Å. The X-ray scattering data of solutions having the Cgly/CNi mole ratio of 3.24 (solution B) and 3.94 (solution C), in both of which almost all nickel(II) ions formed the [Ni(gly)3]− complex, showed that the tris(glycinato)nickelate(II) complex had a slightly distorted octahedral structure with the Ni–O and Ni–N bond lengths of (2.03±？.01) Å and (2.14±？.01) Å, respectively. The nonbonding Ni···C(COO), Ni···C(CH2) and Ni···O(O=C) distances were (2.82±？.02) Å, (2.96±？.02) Å, and (4.07±？.03) Å, respectively.
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