ISSN:
0044-2313
Keywords:
Cesium Lutetium(III) Acetate
;
Synthesis
;
Crystal Structure
;
Thermolysis
;
Evolved Gas Aalysis (EGA)
;
Chemistry
;
Inorganic Chemistry
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Description / Table of Contents:
Ternary Acetates of the Lanthanides with Cesium: Dimers in CsLu(CH3COO)4 and Trimers in Cs2[Lu3(CH3COO)10(OH)(H2O)]. Synthesis, Crystal Structures, ThermolysisSingle crystals of CsLu(CH3COO)4 and Cs2[Lu3(CH3COO)10(OH)(H2O)] were obtained from an aqueous solution of lutetium and cesium acetate in a 1:1 molar ratio. The crystal structures (CsLu(CH3COO)4: monoclinic, P21/n (no. 14), Z = 8, a = 1 293.1(2), b = 1 323.8(2), c = 1 622.5(3) pm, β = 92.01(2)°, Vm = 208.97(6) cm3/mol, R = 0.056, Rw = 0.034; Cs2[Lu3(CH3COO)10(OH)(H2O)]: monoclinic, C2/c (no.15), Z = 4, a = 2 138.5(6), b = 1 378.0(3), C = 1 482.9(4) pm, β = 106.15(2)°, Vm = 632.0(3) cm3/mol, R = 0.049, Rw = 0.036) were determined from four-circle-diffractometer data. The structures consist of dimers and trimers, respectively, that are built by bridging acetate groups. These units are fragments of the infinite chains of the Ho(CH3COO)3 type of structure. The isotypic compounds CsM(CH3COO)4 with M=Eu—Lu were synthesized and characterized by the X-ray Guinier technique. The thermal decomposition of CsLu(CH3COO)4 was examined with thermoanalytical methods (TG/DSC with coupled gas analysis) and the Guinier-Simon technique: it decomposes at 260°C in an endothermic reaction to Lu2O3 and Cs2CO3.
Notes:
Die Verbindungen CsLu(CH3COO)4 und Cs2[Lu3(CH3COO)10(OH)(H2O)] konnten aus wäßriger Lösung von Cs(CH3COO) und Lu(CH3COO)10 (OH)(H2O) dargestellt werden. Ihre Kristallstrukturen (CsLu(CH3COO)4: monoklin, P21/n (Nr. 14), Z = 8, a = 1293,1(2), b = 1323,8(2), c = 1 622,5(3) pm, β = 92,01(2)°, Vm = 208,97(6) cm3/mol, R = 0,056, Rw = 0,034; Cs2[Lu3(CH3COO)10(OH)(H2O)]: monoklin, C2/c (Nr. 15), Z = 4, a = 2138,5(6), b = 1378,0(3), C = 1 482,9(4) pm, β = 106,15(2)°, Vm = 632,0(3) cm3/mol, R = 0,049, Rw = 0,036) wurden anhand von Vierkreisdiffraktometerdaten bestimmt. In den Kristallstrukturen liegen zwei- bzw. dreikernige Baueinheiten vor, die durch verbrückende Acetatgruppen aufgebaut werden und Fragmente der unendlichen Ketten im Ho(CH3COO)3-Typ darstellen. Die isotypen Verbindungen CsM(CH3COO)4, M=Eu—Lu, wurden hergestellt und mittels Pulver-Röntgenmethoden charakterisiert. Das thermische Verhalten von CsLu(CH3COO)4 wurde mittels TG/DSC und simultaner Gasanalyse (EGA) einerseits und mit Hilfe der Guinier-Simon-Technik andererseits untersucht: Es zersetzt sich ab 260°C in Cs2CO3 und Lu2O3.
Additional Material:
6 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/zaac.19936190824
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