Beryllium iodide

• Beryllium ( II) iodide
• Berylliumdiiodid

White needles

Fixed

4.325 g · cm -3 ( 20 ° C)

510 ° C

590 ° C

• Reacts violently with water
• Soluble in ethanol

Risk

-192.5 KJ / mol

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Berylliumiodid is the Berylliumsalz of hydriodic acid with the ratio formula BeI2. The hygroscopic, highly toxic substance forms tetragonal or rhombic white needles and reacts violently with water.

Production

Berylliumiodid can be prepared from the elements at 500-700 ° C.

Also, the reaction of hydrogen iodide, and beryllium in the gas phase (nitrogen) at 600-700 ° C is possible.

The wet chemical synthesis is possible.

Properties

Berylliumiodid is a very hygroscopic white powder, which reacts with water violently with formation of hydrogen iodide.

The iodine in Berylliumiodid is easily displaced by other halogens: fluorine arise beryllium fluoride and various Iodfluoride, with chlorine and bromine to form beryllium and Berylliumbromid. With oxidizing agents such as potassium permanganate or potassium iodide is oxidized in a violent reaction of elemental iodine. In the vapor phase Berylliumiodid exists as a dimer. At 1200 ° C, the vapor decomposes into the elements. The enthalpy of formation of Berylliumiodid is 21.80 kJ / mol, the enthalpy of vaporization of 70.5 kJ / mol. From Berylliumiodid three different crystal structures are known.

Lattice parameters of the different modifications of Berylliumiodid