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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 | Source: | 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. | Keywords: | Metal Oxide nanomaterials;Physical Analysis and Characterisation | Document URI: | http://hdl.handle.net/1942/939 | ISSN: | 0022-4596 | e-ISSN: | 1095-726X | DOI: | 10.1016/j.jssc.2004.10.042 | ISI #: | 000227042200025 | Category: | A1 | Type: | Journal Contribution | Validations: | ecoom 2006 |
Appears in Collections: | Research publications |
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