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2005
Chromium
I 5500
35- 020
Synthesis, Crystal Structure, and Properties of Chromium(III) Trimetaphosphinate Heptahydrate, Cr(PO2NH)3�2O. ? The title compound precipitates from an
aqueous solution of Cr(NO3)3 and Na3(PO 2NH)3. The growth of single crystals by a gelatine diffusion technique is described. Cr(PO2NH)3�2O crystallizes in the monoclinic space group P21/n with Z = 4. The P3N3 rings of the [(PO2NH)3]3- ions are present as
mixture of boat and twist conformations in the ratio 1:1. The Cr3+ ions are octahedrally
coordinated by six water molecules. The arrangement of the [Cr(OH2)6]3+ octahedra and
the [(PO2NH)3]3- units can be described as a distorted variant of the CsCl structure type.
? (CORRELL, S.; SEDLMAIER, S.; SCHNICK*, W.; Z. Anorg. Allg. Chem. 631
(2005) 8, 1359-1364; Lehrstuhl Anorg. Festkoerperchem., Ludwig-MaximiliansUniv., D-81377 Muenchen, Germany; Ger., Abstr. Eng.) ? Schramke
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