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Please use this identifier to cite or link to this item: http://hdl.handle.net/1942/939

Title: Characterization and structural study of lanthanum citrate trihydrate [La(C6H5O7)(H2O)2].H2O
Authors: VANHOYLAND, Geert
PAGNAER, John
D'HAEN, Jan
MULLENS, Steven
MULLENS, Jules
Issue Date: 2005
Publisher: Elsevier
Citation: Journal of Solid State Chemistry, 178(1). p. 166-171
Abstract: [La(C6H5O7)(H2O)2]·H2O was synthesized as precursor material for an aqueous solution–gel route to La-containing multimetal oxides. The compound was characterized by means of FTIR, TGA and pycnometry. The crystallographic structure was solved from powder diffraction data. The symmetry is monoclinic [a=17.097(3) Å, b=9.765(2) Å, c=6.3166(8) Å and β=90.42(1)°, Zexp=3.96] with space group P21/n (14). Direct methods were applied and the model was subsequently least-squares refined (RB=5.1% and RwP=12.0%). La3+ is nine-fold coordinated, the LaO9 forming a mono-capped square antiprism. The basic unit is a binuclear entity of two LaO9 polyhedra having one edge in common. These units are connected along the c-axis through citrate molecules. The carboxylate groups of the citrate are coordinated to La3+ in monodentate, bidentate and bridging way. Also the alkoxide group, which carries the proton, is coordinated to La3+. Two water molecules complete the coordination sphere, while the third one can be found inbetween the La3+-citrate network.
URI: http://hdl.handle.net/1942/939
DOI: 10.1016/j.jssc.2004.10.042
ISI #: 000227042200025
ISSN: 0022-4596
Category: A1
Type: Journal Contribution
Validation: ecoom, 2006
Appears in Collections: Research publications

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