Characterization and structural study of lanthanum citrate trihydrate [La(C{sub 6}H{sub 5}O{sub 7})(H{sub 2}O){sub 2}].H{sub 2}O
- Laboratory of Inorganic and Physical Chemistry, IMO, Limburgs Universitair Centrum, B-3590 Diepenbeek (Belgium)
- IMEC VZW, division IMOMEC, Wetenschapspark 1, B-3590 Diepenbeek (Belgium)
- VITO NV, Boeretang 200, B-2400 Mol (Belgium)
[La(C{sub 6}H{sub 5}O{sub 7})(H{sub 2}O){sub 2}].H{sub 2}O 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)A, b=9.765(2)A, c=6.3166(8)A and {beta}=90.42(1){sup o}, Z{sub exp}=3.96] with space group P2{sub 1}/n (14). Direct methods were applied and the model was subsequently least-squares refined (R{sub B}=5.1% and R{sub wP}=12.0%). La{sup 3+} is nine-fold coordinated, the LaO{sub 9} forming a mono-capped square antiprism. The basic unit is a binuclear entity of two LaO{sub 9} 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 La{sup 3+} in monodentate, bidentate and bridging way. Also the alkoxide group, which carries the proton, is coordinated to La{sup 3+}. Two water molecules complete the coordination sphere, while the third one can be found in between the La{sup 3+}-citrate network.
- OSTI ID:
- 20721681
- Journal Information:
- Journal of Solid State Chemistry, Vol. 178, Issue 1; Other Information: DOI: 10.1016/j.jssc.2004.10.042; PII: S0022-4596(04)00589-4; Copyright (c) 2004 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); ISSN 0022-4596
- Country of Publication:
- United States
- Language:
- English
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