Germanium (IV) iodide

Crystal structure
__ Ge 4+      __ I -
Crystal system	cubic
Space group	Pa 3 (No. 205)
Lattice parameters	a = 11.89 Å
General
Surname	Germanium (IV) iodide
other names	Germanium tetraiodide Tetraiodgerman
Ratio formula	GeI 4
Brief description	orange-red solid
External identifiers / databases
CAS number 13450-95-8 EC number 236-613-7 ECHA InfoCard 100.033.271 PubChem 83479 Wikidata Q4202655
properties
Molar mass	580.26 g mol −1
Physical state	firmly
density	4.32 g cm −3 (25 ° C)
Melting point	146 ° C
boiling point	348 ° C
safety instructions
GHS labeling of hazardous substances danger H and P phrases H: 314 P: 280-305 + 351 + 338-310
Thermodynamic properties
ΔH f 0	−142 kJ mol −1
As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Germanium (IV) iodide is an inorganic chemical compound of germanium from the group of iodides .

Extraction and presentation

Germanium (IV) iodide can be obtained by reacting germanium (IV) oxide with boiling hydriodic acid or germanium with iodine at temperatures above 220 ° C.

${\displaystyle {\ce {GeO2 + 4HI -> GeI4 + 2H2O}}}$

${\displaystyle {\ce {Ge + 2I2 -> GeI4}}}$

properties

Germanium (IV) iodide is an orange-red crystalline solid that hydrolyzes in water . It is soluble in carbon disulfide and benzene , but less soluble in carbon tetrachloride and trichloromethane . It begins to break down into germanium (II) iodide and iodine above the melting temperature. Germanium (IV) iodide crystallizes in the cubic crystal system , space group Pa 3 (space group no. 205) , with the lattice parameter a = 11.89 Å . The crystal structure consists of tetrahedral GeI ₄ molecules.

Individual evidence

1. ↑ ^{a b c} Georg Brauer (ed.), With the collaboration of Marianne Baudler a . a .: Handbook of Preparative Inorganic Chemistry. 3rd, revised edition. Volume I, Ferdinand Enke, Stuttgart 1975, ISBN 3-432-02328-6 , p. 726.
2. ↑ ^{a b c d e} data sheet Germanium (IV) iodide, 99.99% trace metals basis from Sigma-Aldrich , accessed on January 19, 2014 ( PDF ).
3. ^ William M. Haynes: CRC Handbook of Chemistry and Physics, 93rd Edition . CRC Press, 2012, ISBN 1-4398-8049-2 , pp. 4–65 ( limited preview in Google Book Search).
4. ^ AF Holleman , N. Wiberg : Inorganische Chemie . 103rd edition. Volume 1: Basics and main group elements. Walter de Gruyter, Berlin / Boston 2016, ISBN 978-3-11-049585-0 , p. 1171 (reading sample: Part A - Basics of the chemistry of hydrogen. Google book search ).
5. ^ AF Holleman , E. Wiberg , N. Wiberg : Textbook of Inorganic Chemistry . 101st edition. Walter de Gruyter, Berlin 1995, ISBN 3-11-012641-9 , p. 957.
6. ^ FM Jaeger, P. Terpstra, HGK Westenbrink: On the crystal structure of germanium-tetraiodide. In: Proceedings of the Koninklijke Nederlandse Academie van Wetenschappen , 28, 1925, pp. 747-766.