Hexafluorosilicates of sarcosine
- Author(s)
- Michel Fleck, V. V. Ghazaryan, A.M. Petrosyan
- Abstract
Recently we established the existence of an entire class of salts of amino acids with hexafluorosilicateanions. Three types of salts with singly charged cations are formed: 2Aþ$SiF6 2 _, Aþ$(A/Aþ)$SiF6 2 _,2(A/Aþ)$SiF6 2 _, where A and Aþ are amino acids in zwitterionic and singly charged state and (A/Aþ) isdimeric cation with short hydrogen bond. In present work we investigated the systemsarcosine þ H2SiF6 þ H2O. Salts of all three mentioned types are formed in this system: 2Sar$H2SiF6(2Sarþ$SiF6 2 _) (I), 3Sar$H2SiF6$2H2O (Sarþ$(Sar/Sarþ)$SiF6 2 _$2H2O) (II), 4Sar$H2SiF6 (2(Sar/Sarþ)$SiF6 2 _)(III). The crystal and molecular structures at room temperature as well as thermal expansion of all threecrystals are determined. A phase transition near 180 K was found in (II) and the structure below phasetransition point (at 150 K) is determined. In addition to (I) a hydrated sample (Ia) is identified by theinfrared spectrum. Infrared and Raman spectra of (I, II, III) are discussed on the basis of their structures.
- Organisation(s)
- Department of Mineralogy and Crystallography
- External organisation(s)
- National Academy of Sciences of the Republic of Armenia
- Journal
- Solid State Sciences
- Volume
- 14
- Pages
- 952-963
- No. of pages
- 12
- ISSN
- 1293-2558
- Publication date
- 2012
- Peer reviewed
- Yes
- Austrian Fields of Science 2012
- 105116 Mineralogy
- Portal url
- https://ucrisportal.univie.ac.at/en/publications/3e72d56d-fa33-4bb6-815f-a99022da9eda