Tellurium tetrabromide

From Wikipedia, the free encyclopedia
Jump to: navigation, search
Tellurium tetrabromide
Identifiers
CAS number 10031-27-3
PubChem 82311
ChemSpider 74282
Jmol-3D images Image 1
Properties
Molecular formula TeBr4
Molar mass 447.22 g/mol
Appearance yellow-orange crystals
Density 4.3 g/cm3, solid
Melting point 388 °C (730 °F; 661 K)[1]
Boiling point decomposes at 420 °C (788 °F; 693 K)
Structure
Crystal structure monoclinic
Hazards
EU classification not listed
Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
Infobox references

Tellurium tetrabromide (TeBr4) is an inorganic chemical compound. It has a similar tetrameric structure to TeCl4.[2] It can be made by reacting bromine and tellurium.[3] In the vapour TeBr4 dissociates:[2]

TeBr4 → TeBr2 + Br2

It is a conductor when molten, dissociating into the ions TeBr3+ and Br Solutions in benzene and toluene are non conducting and TeBr4 is present as the tetramer, Te4Br16.[2] In solvents with donor properties such as acetonitrile, CH3CN ionic complexes are formed which make the solution conducting:

TeBr4 + 2CH3CN → (CH3CN)2TeBr3+ + Br

References[edit]

  1. ^ Thermochemical Data of Elements and Compounds", M. Binnewies, E. Milke, Wiley-VCH, 2002, ISBN 3-527-30524-6
  2. ^ a b c Inorganic Chemistry,Egon Wiberg, Arnold Frederick Holleman Elsevier 2001 ISBN 0-12-352651-5
  3. ^ Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. ISBN 0080379419.