Tellurium tetraiodide

Tellurium (IV ) iodide

Gray to black solid with acrid odor

Fixed

5.403 g · cm -3

280 ° C

Decomposition in water

Risk

Template: Infobox chemical / molecular formula search available

Tellurtetraiodid is an inorganic chemical compound of tellurium from the group of iodides.

Production and representation

Tellurtetraiodid can be obtained by reaction of telluric acid with hydrogen iodide.

You may also be obtained by reaction of tellurium and iodine, also Tellurdiiodid and Tellurmonoiodid can arise depending on the reaction conditions.

Properties

Tellurtetraiodid is an iron- gray solid, which slowly decomposes in cold water in warm water quickly tellurium dioxide and hydrogen iodide. It is also resistant to humid air and decomposes on heating iodine delivery. It is soluble in hydroiodic acid to form H [ TeI5 ], and slightly soluble in acetone. Of Tellurtetraiodid 5 modifications are known, all of which are composed of tetrameric molecules. The δ - form is the thermodynamically most stable form. This leads (as well as the α -, β - and γ - form) structurally on the ε - form, which has a structure of the Kuban - type, can be described as composed of four linked via halide bridges TeI3 I units. Where the individual forms differ in that a TeI3 corner of the cube is moved.