CRYSTAL STRUCTURE OF CALCIUM cis(N)-bis(IMINODIACETATO)CHROMATE(III) NONAHYDRATE Ca[Cr(Ida)2]2·9H2O
M. Zabel, V. I. Pavlovskii, A. L. Poznyak
Keywords: crystal structure, bis(iminodiacetato)chromate(III) ion, calcium salt
Pages: 602-604
Abstract
In the crystals of [Ca(H2O)5][Cr(Ida)2]2·4H2O (triclinic symmetry, a = 10.1056(10) Å, b = 13.0077(11) Å, c = 13.1185(13) Å, α = 70.186(11)°, β = 81.248(11)°, γ = 78.996(11)°, Z = 2, space group P1) cyclic centrosymmetric tetramers are present. In them calcium ions are bonded to oxygen atoms of the carboxyl groups of two octahedral complex cis(N)-[Cr(Ida)2]- ions (Ida is the iminodiacetic acid anion). The О atoms of five water molecules complete the Са atom environment to a distorted pentagonal bipyramid. Isolated [Cr(Ida)2]- ions of a similar structure neutralize the positive charge of tetramers.
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