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Tantalum(V) bromide : ウィキペディア英語版
Tantalum(V) bromide

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Tantalum(V) bromide is the inorganic compound with the formula Ta2Br10.〔Greenwood, N. N.; & Earnshaw, A. Chemistry of the Elements (2nd Edn.), 1997, Oxford:Butterworth-Heinemann. ISBN 0-7506-3365-4.〕 It is a diamagnetic yellow solid that hydrolyses readily. The compound adopts an edge-shared bioctahedral structure, which means that two square pyramidal TaBr5 subunits are joined by a pair of bridging bromide ligands. The pentachlorides and pentaiodides of Nb and Ta share this structural motif.〔K. Habermehl, I. Pantenburg, G. Meyer "Redetermination of Tantalum Pentabromide, (TaBr5)2" Acta Cryst. 2010, E66, i67. 〕
==Preparation and handling==
The material is usually prepared by the reaction of bromine with tantalum metal (or tantalum carbide) at elevated temperatures in a tube furnace. The bromides of the early metals are sometimes preferred to the chlorides because of the relative ease of handling liquid bromine vs gaseous chlorine. Like other molecular halides, it is soluble in nonpolar solvents such as carbon tetrachloride (1.465 g/100 mL at 30 °C), but it reacts with many other solvents.〔D. H. Nowicki, I. E. Campbell "Tantalum(V) Bromide" Inorganic Syntheses 1953, volume IV, p. 130. 〕

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