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An X-ray Diffraction Study on Zinc(II) Complexes with α-Alaninate Ion in Aqueous Solution

1990; Oxford University Press; Volume: 63; Issue: 12 Linguagem: Inglês

10.1246/bcsj.63.3420

1348-0634

Tamás Radnai, Kenta Inoue, Hitoshi Ohtaki,

Crystal structures of chemical compounds

Abstract The structures of mono(α-alaninato)zinc(Il), bis(α-alaninato)zinc(II), and tris(α-alaninato)zincate(II) complexes in aqueous solutions were determined by the X-ray diffraction method. All the three complexes have the octahedral structure in the form [Zn(α-ala)(H2O)4]+, [Zn(α-ala)2(H2O)2], and [Zn(α-ala)3]−. The structures of the complexes were different from those of the glycinato complexes of zinc(II) ion, which were all regular octahedral. The length of the Zn–O bond in the α-alaninato complexes was shorter than that of the Zn–N bond due to the inductive effect of the substituted methyl group at the α-carbon on the oxygen atom in the amino acid. The lengths of the Zn–O and Zn–N bonds in the complexes determined are, respectively, as follows: [Zn(α-ala)(H2O)4]+, 202 and 214 pm; [Zn(α-ala)2(H2O)2], 203 and 214 pm; [Zn(α-ala)3]−, 202 and 213 pm.