Silver tetraiodomercurate(II)
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| Preferred IUPAC name
Silver tetraiodomercurate(II) | |
| Identifiers | |
3D model (JSmol) |
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| ECHA InfoCard | 100.029.132 |
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PubChem CID |
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| UNII | |
CompTox Dashboard (EPA) |
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| Properties | |
| Ag2HgI4 | |
| Molar mass | 923.946 g·mol−1 |
| Hazards | |
| GHS labelling: | |
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| Danger | |
| H300, H310, H330, H373, H410 | |
| P260, P262, P264, P270, P271, P273, P280, P284, P301+P316, P302+P352, P304+P340, P316, P319, P320, P321, P330, P361+P364, P391, P403+P233, P405, P501 | |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references | |
Silver tetraiodomercurate(II), the inorganic chemical having chemical formula Ag2HgI4, is a salt containing silver as cations and the tetraiodomercurate(II) polyatomic metal complex as dianion. This compound is thermochromic, reversibly changing from yellow below 50 °C to orange at higher temperature. This color change is an effect of a change from a highly ordered phase, with the silver ions rigidly held in the crystal structure, to one in which the silver ions are randomly distributed and freely moving.[1] It is polycrystalline material whose free ions give it strong enough electrolyte properties for it to be considered a superionic conductor.[2]
A film of silver tetraiodomercurate (II) wih additional mercurous and silver halide salts changes color in response to moisture in a predictable way, allowing its use for measuring of humidity and sweating.[3][4]
The presence of various additives can alter the phase-transition temperature.[5]
References
- ↑ Raditoiu, Valentin; Radovici, Constantin; Raditoiu, Alina; Nicolae, Cristian Andi; Culita, Daniela Cristina; Fierascu, Radu Claudiu; Amariutei, Viorica; Wagner, Luminita Eugenia (2013-10-01). "Switching behavior of thermochromic copper and silver tetraiodomercurate embedded in silica hybrid materials". Optical Materials. 35 (12): 2565–2572. Bibcode:2013OptMa..35.2565R. doi:10.1016/j.optmat.2013.07.027. ISSN 0925-3467.
- ↑ Paul, T. K.; Rao, S. Eswara; Bhuniya, R. C. (1988). "Electrons and holes in the solid electrolyte Ag2HgI4". Journal of Physics D: Applied Physics. 21 (2): 339–343. Bibcode:1988JPhD...21..339P. doi:10.1088/0022-3727/21/2/014.
- ↑ Cohen, S. D.; Newman, G. A. (1966). "Chemistry and Mechanism of Sivadjian's Hygrophotographic System". The Journal of Photographic Science. 14: 2–8. doi:10.1080/00223638.1966.11737325.
- ↑ Sivadjian, Joseph (2008). "Hygrophotographic Technique for Testing Local Antiperspirant Activity". Pharmacology. 16 (4): 214–216. doi:10.1159/000136769. PMID 345290.
- ↑ Jaw, Huey-Rong C.; Mooney, Margaret M.; Novinson, Thomas; Kaska, William C.; Zink, Jeffrey I. (1987-05-01). "Optical properties of the thermochromic compounds Ag2HgI4 and Cu2HgI4". Inorganic Chemistry. 26 (9): 1387–1391. doi:10.1021/ic00256a011. ISSN 0020-1669.