Indium(I) chloride
Identifiers
Properties
Appearance red and yellow
Density 4.218 g/cm3[1]
Melting point 216 °C (421 °F; 489 K)
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

Indium(I) chloride (also indium monochloride) is the chemical compound with the formula InCl. Indium monochloride occurs as a yellow cubic form below 120 °C and above this temperature as a red orthorhombic form.[2] InCl is one of three known indium chlorides.

Synthesis and structure

InCl can be prepared by heating indium metal with indium trichloride in a sealed tube.[3][4]

According to X-ray crystallography, the structure of the yellow polymorph resembles that of sodium chloride except that the Cl-In-Cl angles are not 90°, but range between 71 and 130°. The red (high T) polymorph crystallizes in the thallium(I) iodide motif.[5][6]

Reactivity

The relatively high energy level of the 5s electrons of the indium center make InCl susceptible to oxidation as well as disproportionation into In(0) and InCl3.[2] Tetrahydrofuran (THF) appears to facilitate the disproptionation of InCl as well as other indium(I) halides.[2]

History

Indium(I) chloride was first isolated in 1926 as part of an investigation on the compounds formed between indium and chlorine.[7]

References

  1. ↑ Van Den Berg, J. M. (1966). "The crystal structure of the room temperature modification of indium chloride, InCl". Acta Crystallographica. 20 (6): 905–910. Bibcode:1966AcCry..20..905V. doi:10.1107/S0365110X66002032.
  2. 1 2 3 Pardoe, Jennifer A. J.; Downs, Anthony J. (2007-01-01). "Development of the Chemistry of Indium in Formal Oxidation States Lower than +3". Chemical Reviews. 107 (1): 2–45. doi:10.1021/cr068027+. ISSN 0009-2665. PMID 17212469.
  3. ↑ Annan, Theodore A.; Chadha, Raj K.; Doan, Peter; McConville, David H.; McGarvey, Bruce R.; Ozarowski, Andrzej; Tuck, Dennis G. (October 1990). "One-electron transfer processes in the reaction of indium(I) halides with substituted o-quinones". Inorganic Chemistry. 29 (20): 3936–3943. doi:10.1021/ic00345a007. ISSN 0020-1669.
  4. ↑ Poland, J. S.; Tuck, D. G. (1972-09-01). "Coordination compounds of indium: XIV. The insertion of indium(I) iodide into carbon-iodide bonds". Journal of Organometallic Chemistry. 42 (2): 315–323. doi:10.1016/S0022-328X(00)90080-9. ISSN 0022-328X.
  5. ↑ Van Der Vorst, C.P.J.M.; Maaskant, W.J.A. (1980). "Stereochemically active (5s)2 Lone Pairs in the Structures of α-InCl and β-InCl". Journal of Solid State Chemistry. 34 (3): 301–313. doi:10.1016/0022-4596(80)90428-4.
  6. ↑ Van Der Vorst, C. P. J. M.; Verschoor, G. C.; Maaskant, W. J. A. (1978). "The Structures of Yellow and Red Indium Monochloride". Acta Crystallographica Section B Structural Crystallography and Crystal Chemistry. 34 (11): 3333–3335. Bibcode:1978AcCrB..34.3333V. doi:10.1107/S056774087801081X.
  7. ↑ Klemm, Wilhelm (1926). "Messungen an Indiumhalogeniden I" [Measurements on indium halides I]. Zeitschrift für Anorganische und Allgemeine Chemie. 152: 252–266. doi:10.1002/zaac.19261520128.


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