Synthesis and Crystal Structure of the Coordination Compound
of Cadmium Diiodide Monohydrate with Quinoxaline

V. V. Kovalev, Yu. E. Gorbunova, G. A. Razgonyaeva, and Yu. V. Kokunov

Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences,
Leninskii pr. 31, Moscow, 119991 Russia

e-mail: kovavlad@igic.ras.ru

Received June 10, 2015

Abstract—The coordination compound [CdI₂(Quinox)₂(H₂O)] has been synthesized by the reaction between
CdI₂ and quinoxaline (Quinox, C₈H₆N₂) in a water–ethanol (1 : 5) solution, and its crystal structure has been
determined. Crystals are orthorhombic, space group Pnma, a = 13.069(1) Å, b = 15.218(1) Å, c = 9.423(1) Å,
V=1874.0(3) ų, _calcd = 2.284 g/cm³, Z = 4. The cadmium atom is located in the plane m and has a distorted
trigonal bipyramidal coordination; two crystallographically nonequivalent iodine atoms and the O(H₂O) atom
are in the equatorial plane, and the two nitrogen atoms of two symmetric Quinox ligands are in the axial vertices
(Cd(1)–N(1), 2.490(3) 2 Å; Cd(1)–I(1), 2.7533(6) Å; Cd(1)–I(2), 2.7280(7) Å). The angles at the cadmium
atom are 157.1 (2) between the axial nitrogen atoms and 107.9(1)–130.8(1) between the equatorial atoms
(maximum value corresponds to the ICdI angle). The complexes are linked into supramolecular strips via O–
H…N hydrogen bonds.

DOI: 10.1134/S0036023615120165

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