Original scientific paper

The Crystal Structure of trans(N02, N = C-CHl)-(N-ethylidene- ethylenediamine)glycylglycinatonitrocobalt(III) Monohydrate, [Co(glygly)N02(CH3CH =en)]· H20

Bogdan V. Prelesnik ; Laboratory of Solid State Physics and Radiation Chemistry, »Boris Kidric« Institute, 11001 Belgrade, P. 0. Box 522, Yugoslavia
Rajna M. Herak ; Laboratory of Solid State Physics and Radiation Chemistry, »Boris Kidric« Institute, 11001 Belgrade, P. 0. Box 522, Yugoslavia

Abstract

The crystal structure of trans(N02, N = C-CH3) - (N-ethylideneethylenediamine)
glycylglycinatonitrocobalt(III) monohydrate
has been determined from 2519 diffractometric data. The crystals
are monoclinic, space group Pc, with a = 788.4(2), b = 1514.9(2),
c = 1220.6(2) pm, fJ = 120.82(4), M = 339.19, Z = 2, D,,, = 1790, Dx =
= 1800 kg m-3• The structure wais solved by the heavy-atom
method and refined by the full-matrix least-squares technique to
ct final R = 0.057. The crystal structure consists of enantiomeric
pairs of complex molecules and molecules of water. There are two
crystallographically independent but chemically equivalent complex
molecules, which differ only in conformation. The coordination
around cobalt atoms is distorted octahedral. The glycylglycinato
ligand is tridentate and bonded to the metal atom through carboxylato
oxygen, amino nitrogen and peptide nitrogen atoms, forming
two fused chelate rings, which are equatorially disposed. The
diamine ligand is bidentate and contains the N-ethylidene group
in the trans-position with respect to the nitro group. The methyl
group of the aldehyde residue is in the syn-position with respect
to the ethylenediamine residue.

Keywords

Hrčak ID:

194126

URI

https://hrcak.srce.hr/194126

Publication date:

20.10.1984.

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