Silver tetraiodomercurate (II)

Structural formula
	No drawing available
General
Surname	Silver tetraiodomercurate (II)
Molecular formula	Ag 2 HgI 4
Brief description	yellow solid
External identifiers / databases
EC number	232-045-9
ECHA InfoCard	100.029.132
PubChem	20040762
Wikidata	Q15730236
properties
Molar mass	923.94 g mol −1
Physical state	firmly
density	6.02 g cm −3
Melting point	158 ° C (decomposition)
solubility	practically insoluble in water; soluble in alkali iodide or alkali cyanide solutions;
safety instructions
H and P phrases	H: 300-310-330-373-410
	P: 301 + 310-304 + 340-320-330-405-501
	As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Silver tetraiodomercurate (II) is a chemical complex compound which has thermochromic properties. At 40–50 ° C it changes its color from yellow to a bright orange.

Extraction and presentation

Silver tetraiodomercurate (II) can be made from Neßler's reagent and silver nitrate .

${\ displaystyle {\ ce {K2 [HgI4] + 2 AgNO3 -> Ag2 [HgI4] + 2KNO3}}}$

Alternatively, it can be made from soluble silver and mercury salts , precipitated by iodide ions.

${\ displaystyle {\ ce {2Ag + + Hg ^ 2 + + 4I- -> Ag2 [HgI4]}}}$

use

Silver tetraiodomercurate (II) was previously used as an indicator of temperature changes due to its thermochromic properties. However, due to its toxicity, it has been largely replaced by.

Individual evidence

↑ ^a ^b ^c ^d ^e ^f ^g Dale L. Perry: Handbook of Inorganic Compounds, Second Edition . Taylor & Francis US, 2011, ISBN 1-4398-1462-7 , pp. 371 ( limited preview in Google Book search).
↑ ^a ^b Data sheet silver tetraiodomercurate (II) from AlfaAesar, accessed on June 7, 2018 ( PDF )(JavaScript required) .
^ Silver Tetraiodomercurate (II). Retrieved June 6, 2018 .
↑ Valentin Raditoiu, Constantin Radovici, Alina Raditoiu, Cristian Andi Nicolae, Daniela Cristina Culita, Radu Claudiu Fierascu, Viorica Amariutei, Luminita Eugenia Wagner: Switching behavior of thermochromic copper and silver tetraiodomercurate embedded in silica hybrid materials. In: Optical Materials. 35, 2013, p. 2565, doi : 10.1016 / j.optmat.2013.07.027 .
↑ Random Experiments - Experiments and Syntheses: Representation and Properties of Silver Tetraiodomercurate. August 31, 2017, accessed June 6, 2018 .
^ Doug's Lab: Thermochromism ft Silver Tetraiodomercurate. January 21, 2018, accessed June 6, 2018 .
^ Silver Tetraiodomercurate (II). Retrieved June 6, 2018 .

[Dale_L._Perry-1] ↑ ^a ^b ^c ^d ^e ^f ^g Dale L. Perry: Handbook of Inorganic Compounds, Second Edition . Taylor & Francis US, 2011, ISBN 1-4398-1462-7 , pp. 371 ( limited preview in Google Book search).

[Alfa-2] Data sheet silver tetraiodomercurate (II) from AlfaAesar, accessed on June 7, 2018 ( PDF )(JavaScript required) .

[3] Silver Tetraiodomercurate (II). Retrieved June 6, 2018 .

[DOI10.1016/j.optmat.2013.07.027-4] Valentin Raditoiu, Constantin Radovici, Alina Raditoiu, Cristian Andi Nicolae, Daniela Cristina Culita, Radu Claudiu Fierascu, Viorica Amariutei, Luminita Eugenia Wagner: Switching behavior of thermochromic copper and silver tetraiodomercurate embedded in silica hybrid materials. In: Optical Materials. 35, 2013, p. 2565, doi : 10.1016 / j.optmat.2013.07.027 .

[5] Random Experiments - Experiments and Syntheses: Representation and Properties of Silver Tetraiodomercurate. August 31, 2017, accessed June 6, 2018 .

[6] Doug's Lab: Thermochromism ft Silver Tetraiodomercurate. January 21, 2018, accessed June 6, 2018 .

[7] Silver Tetraiodomercurate (II). Retrieved June 6, 2018 .