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Indium tribromide, InBr3

Indium tribromide, InBr3, is prepared by the action of bromine vapour upon heated indium, and may be sublimed in a current of carbon dioxide. It resembles the trichloride in properties. Numerous physical properties of indium tribromide solutions have been measured by Heydweiller. The equivalent conductivities at 18° are as follows: -

v9.97015.00002.00320.99620.50030.2640
1000η0.10030.20000.49921.00381.99863.7875
λ53.8546.7537.0228.6719.8311.04


The double salts K3InBr6.2H2O, (NH4)2InBr5.H2O, Rb2InBr5.H2O, and Cs2InBr5.H2O are isomorphous with the corresponding chlorine compounds.

The following densities (at 20°) and crystallographic constants are given by Wallace: -

Crystal symmetryCompounda:b:cdensity
TetragonalK3InCl6.2H2O
K3InBr6.2H2O
1:0.8173:0.8173:2.483
3.140
Orthorombic(NH4)2InCl5.H2O
Rb2InCl5.H2O
Cs2InCl5.H2O
(NH4)2InBr5.H2O
Rb2InBr5.H2O
Cs2InBr5.H2O
0.9668:1:1.4005
0.9725:1:1.4085
0.9841:1:1.4033

0.9803:1:1.3951
0.9734:1:1.4180
2.281
3.089
3.350
3.167
3.409
3.776

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