A. N. Chekhlov
Sep 1, 2004
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Journal
Russian Journal of Coordination Chemistry
Abstract
A complex salt, namely, 4,7,13,16,21,24-hexaoxa-1,10-diazoniabicyclo[8.8.8]hexacosane pentaaqua[bis(nitrato-O,O′)]yttrium(III) dichloride nitrate [Y(NO3)2(H2O)5]+[H2(Crypt-222)]2+2Cl–NO–3 (I) was synthesized and structurally characterized by X-ray diffraction analysis (triclinic crystal system, space group P31с, a = 8.443(1) Å, c = 28.110(5) Å, Z = 2). The structure was solved by the direct method and refined by the full-matrix least-squares method in the anisotropic approximation to R = 0.072 from 2000 measured reflections (CAD4 automated diffractometer, λCuKα radiation). The crystal structure of I is highly disordered. All ions are located in crystallographic axes 3 and all but one Cl– ion are disordered. In the [Y(NO3)2(H2O)5]+ complex cation, the coordination polyhedron of the Y atom (C.N. 9) is a distorted pentagonal bipyramid with two O atoms of two nitrato ligands as two bifurcate vertices and five O atoms of five water molecules as the base.