Tris[di(chloromethyl)phosphinate]lanthanum Dihydrate:
Crystal Structure

G. G. Aleksandrov*, V. S. Sergienko*, and E. G. Afonin**

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

** Laboratory of Chemical Technology, Kaluga, Russia

Received May 11, 2000

Abstract—The X-ray crystal structure of LaL₃ · 2H₂O, where HL is di(chloromethyl)phosphinic acid, is deter-
mined. Two crystallographically nonequivalent atoms, La(1) and La(2) are each coordinated in the vertexes of
a pentagonal bipyramid by six O(P) atoms of six L^– anions, which behave as bidentate ₂-bridging ligands, and
the O(w) atom of a water molecule. The La(H₂O)L₃ species of both types are linked in polymeric chains run-
ning along the x axis of the crystal. The chains are linked by O–H···O hydrogen bonds between coordinated and
crystal water molecules and by short Cl···Cl contacts. A polycrystalline sample of the complex is shown by
Xray powder diffraction to be single-phase.

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