Chemistry:Methylammonium halide
Methylammonium halides are organic halides with a formula of [CH
3NH
3]+
X−
, where X is F for methylammonium fluoride, Cl for methylammonium chloride, Br for methylammonium bromide, or I for methylammonium iodide. Generally they are white or light colored powders.
Applications
These salts are components of perovskite solar cells, which are being evaluated for commercialization.[1] The iodide is the most commonly used. Magneto-optical data storage concepts are also being testing based on various ammonium halides.[2]
Production
These compounds are usually prepared by combining equimolar amounts of methylamine with the appropriate halide acid. For instance methylammonium iodide is prepared by combining methylamine and hydrogen iodide at 0 °C for 120 minutes followed by evaporation at 60 °C, yielding crystals of methylammonium iodide.[3]
- CH
3NH
2 + HI → [CH
3NH
3]I
Crystallography
These compounds' crystallography has been the subject of much investigation. J.S. Hendricks published an early paper on them in 1928.[4] Methylammonium chloride was investigated again in 1946[5] and methylammonium bromide in 1961.[6]
See also
References
- ↑ Li, Hangqian. (2016). "A modified sequential deposition method for fabrication of perovskite solar cells". Solar Energy 126: 243–251. doi:10.1016/j.solener.2015.12.045. Bibcode: 2016SoEn..126..243L.
- ↑ Náfrádi, Bálint (24 November 2016). "Optically switched magnetism in photovoltaic perovskite CH3NH3(Mn:Pb)I3". Nature Communications 7: 13406. doi:10.1038/ncomms13406. PMID 27882917. Bibcode: 2016NatCo...713406N.
- ↑ Qiu, Jianhang; Qiu, Yongcai; Yan, Keyou; Zhong, Min; Mu, Cheng; Yan, He; Yang, Shihe (2013), "All-solid-state hybrid solar cells based on a new organometal halide perovskite sensitizer and one-dimensional TiO2 nanowire arrays", Nanoscale 5 (8): 3245–3248, doi:10.1039/C3NR00218G, PMID 23508213, Bibcode: 2013Nanos...5.3245Q
- ↑ Hendricks, J.S. (1928), "The crystal structures of the monomethyl ammonium halides", Z. Kristallogr. 67 (1): 106–118, doi:10.1524/zkri.1928.67.1.106
- ↑ Hughes, Edward W.; Lipscomb, William N. (1946), "The Crystal Structure of Methylammonium Chloride", J. Am. Chem. Soc. 68 (10): 1970–1975, doi:10.1021/ja01214a029
- ↑ Gabe, E.J. (1961), "The crystal structure of methylammonium bromide", Acta Crystallogr. 14 (12): 1296, doi:10.1107/S0365110X6100382X
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