Crystal structure of triethanolammonium bis(1-hydroxyethane-1,1-diphosphonato)diaquazincate pentahydrate, [(OHCH2CH2)(3)NH][Zn(H2O)(2)(H2.5L)(2)]center dot 5H(2)O

The crystal structure of [(HOCH2CH2)(3)NH][Zn(H2O)(2)(H2.5L)(2)] . 5H(2)O, where H4L is 1-hydroxyethane-1,1-diphosphonic acid, was determined by X-ray diffraction. The anionic complex has a cis-octahedral structure. The zinc atom is coordinated by four O atoms of two bidentate chelate H2.5L1.5- liga nds and two O atoms of water molecules. The Zn-O(L) bond lengths range betw een 2.050 and 2.175 Angstrom, and the Zn-O(H2O) bond lengths are 2.105 and 2.133 Angstrom. The anionic complexes, triethanolammonium cations, and mole cules of crystallization water are interlinked by an extensive network of h ydrogen bonds. The crystallographic data for isostructural complexes of cob alt and nickel are given. (C) 2000 MAIK "Nauka/Interperiodica".