Crystal Structure of Tetrakis(alaninato)di(μ)aquadicobalt(II) monohydrate

Abstract

The title compound, tetrakis(alaninato)di(μ)aquadicobalt(II)monohydrate, is a three-dimensional hydrogen-bonded supramolecular complex, which crystallizes in the monoclinic space group P2₁/c with unit-cell parameters a = 13.7266(7), b = 4.9866(2), c = 19.4759(10)Å and Z = 2. The Co(II) ion is in an octahedral coordination environment comprising two amino N atoms, two carboxylate O atoms and two O atoms from water molecules. The molecules are linked principally by N-H…O hydrogen bonds involving the amino NH₂ groups and carboxylate O atoms, forming R₂²(8) and R₂²(12) rings that link to give a one-dimensional network of molecules. The N-H…O hydrogen bonding is supported by three different O-H…O hydrogen bonds from the water O atoms to either a carboxylate O atom or water O atoms in neighbouring molecules. The combination of the intermolecular N-H…O and O-H…O hydrogen bonds produce R₂²(4), R₂²(8), R₂²(12) and R₆⁶(32) rings, which lead to three-dimensional polymeric chains.