The Conditions of Formation of Heterometallic Complexes
in the GeCl₄ (SnCl₄)Citric AcidM(CH₃COO)₂H₂O Systems.
The Crystal and Molecular Structures
of [M(H₂O)₆][Ge(HCit)₂] 4H₂O (M = Mg, Mn, Co, Cu, Zn)
and [M(H₂O)₆][Sn(HCit)₂] 4H₂O (M = Mg, Co, Ni)

E. E. Martsinko^a, L. Kh. Minacheva^b, E. A. Chebanenko^a, I. I. Seifullina^a,
V. S. Sergienko^b, and A. V. Churakov^b

^a Mechnikov University, ul. Petra Velikogo 2, Odessa, 270100 Ukraine

^b Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences,
Leninskii pr. 31, Moscow, 117907 Russia

Received November 16, 2012

Abstract—Fourteen bis(citrato)germanates(IV) and bis(citrato)stannates(IV) were prepared, in particular,
[M(H₂O)₆][Ge(HCit)₂] 4H₂O (M = Mg (I), Mn (II), Fe (III), Co (IV), Ni (V), Cu (VI), Zn (VII)) and
[M(H₂O)₆][Sn(HCit)₂] nH₂O (M = Mg, n = 4 (VIII); Mn, n = 2 (IX); Fe, n = 4 (X); Co, n = 4 (XI); Ni, n= 4
(XII); Cu, n = 4 (XIII); Zn, n = 3 (XIV)) (H₄Cit is citric acid). The purity and the composition of the products
were determined by a set of physicochemical methods including elemental analysis, thermogravimetry, and IR
spectroscopy. The structures of I, II, IV, VI, VII, VIII, XI, and XII were determined by X-ray diffractometry.
All eight crystals composed of centrosymmetrical octahederal [M(H₂O)₆]²⁺ cations, [Ge(HCit)₂]^2– (or
[Sn(HCit)₂]^2–) anions, and crystal water molecules are isostructural. The structural units in I, II, IV, VI, VII,
VIII, XI, and XII are connected by systems of hydrogen bonds to form a three-dimensional framework.

DOI: 10.1134/S003602361305015X

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