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The structure of hydro-trans-diiodobis(2,3-butanedione dioximato)cobaltate(III), H(CoI 2 (dmg) 2 ) (dmg -  = dimethylglyoximate) has been determined by single crystal X -ray diffraction at ambient temperature. The crystals are monoclinic, space group C 2/c, C 8 H 15 CoI 2 N 4 O 4 , M r  = 543.98; a = 15.714(6), b = 7.408(3), c = 13.944(5) Å; β = 107.76(3)°; V = 1545.85 Å 3 ; Z = 4; D c  = 2.34 Mg m  -3 . The com pound is best visualized as a monobasic acid. The molecules are linked together into two-dimensional network, where linkage parallel to the ac plane is effected by weak intermolecular iodine interactions (I ···I = 3.826 Å), and linkage along the b axis by symmetric intermolecular O - H - O bridges (O - O intermol  = 2.499 Å) involving the acidic protons. Each molecule contains two equivalent intramolecular O - H - O bridges (O ··· O intrarnol  = 2.603 Å). The coordination geometry around Co is a distorted (4+2) octahedron of four chelating equatorial N atoms and two apical iodine atoms. The rectilinear I- Co- I triads are arranged in infinite, faintly zigzagged heteroatomic chains propagating parallel to the ac plane.

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Pseudo-Polymerization via Symmetric O -H -O Bonding of the Cobaloximatic Acid, Hydro-trans-Diiodobis(2,3-butanedione dioximato(1-)-N ,N′)cobaltate(III). X-Ray Crystal and Molecular Structure