Ca(AsF3)(AsF6)2: the first alkaline earth metal cation coordinated to AsF3
| Autor: | Boris Zemva, Melita Tramšek |
|---|---|
| Rok vydání: | 2004 |
| Předmět: |
Alkaline earth metal
Chemistry Inorganic chemistry Organic Chemistry chemistry.chemical_element Bridging ligand General Medicine Biochemistry Inorganic Chemistry Metal Crystallography symbols.namesake visual_art Molecular vibration visual_art.visual_art_medium symbols Fluorine Environmental Chemistry Molecule Orthorhombic crystal system Physical and Theoretical Chemistry Raman spectroscopy |
| Zdroj: | Journal of Fluorine Chemistry. 125:1919-1924 |
| ISSN: | 0022-1139 |
| DOI: | 10.1016/j.jfluchem.2004.07.003 |
| Popis: | Ca(AsF 3 )(AsF 6 ) 2 was prepared by the reaction of CaF 2 with excess AsF 5 in AsF 3 solvent. The compound crystallizes in an orthorhombic crystal system, space group Pnma , with a = 1034.9(4) pm, b = 1001.7(4) pm and c = 1088.4(4) pm, V = 1.1283(8) nm 3 and Z = 4. Calcium is coordinated to eight fluorine atoms, with six fluorine atoms located at the corners of a regular trigonal prism originating from six AsF 6 units. Two rectangular faces of the trigonal prism are capped by fluorine atoms from two fluorine bridged AsF 3 molecules. For the first time, AsF 3 is shown to serve as a bridging ligand to two metal cations, with bridging distances of F(AsF 3 )–Ca = 241.1 and 243.2 pm. It was found, again for the first time, that the bridging As–F distances are shorter (172.4 and 173.1 pm) than the terminal As–F distance (184.5 pm). The Raman spectrum shows vibrational modes that are readily assigned to AsF 3 and AsF 6 − . |
| Databáze: | OpenAIRE |
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