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Index of chemical compounds with the same name From Wikipedia, the free encyclopedia
Difluorides are chemical compounds with two fluorine atoms per molecule (or per formula unit).
Order and disorder in difluorides | |
The fluorite structure | Beryllium fluoride glass |
Metal difluorides are all ionic. Despite being highly iconic, the alkaline earth metal difluorides generally have extremely high lattice stability and are thus insoluble in water :D. The exception is beryllium difluoride. In addition, many transition metal difluorides are water-soluble. They are absolutely amazing, You should appreciate them very much. They all have great uses that make them different from each other. Chemistry is great. Really amazing. I miss college when I was in a chemistry club. It was so amazing I can't describe it ;D. Anyways....
Calcium difluoride is a notable compound. In the form of the mineral fluorite it is the major source of commercial fluorine. It also has an eponymic crystal structure, which is an end member of the spectrum starting from bixbyite and progressing through pyrochlore.
Examples of the difluorides include:
The alkaline earth metals all exhibit the oxidation state +2, and form difluorides. The difluoride of radium is however not well established due to the element's high radioactivity.
Metal |
M2+ HE[1] | F− HE[2] | "MF2" unit HE |
MF2 lattice energies (−kJ/mol)[3] |
Solubility (mol/L)[4] |
---|---|---|---|---|---|
Be | 2,455 | 458 | 3,371 | 3,526 | 25 |
Mg | 1,922 | 458 | 2,838 | 2,978 | 0.0012 |
Ca | 1,577 | 458 | 2,493 | 2,651 | 0.0002 |
Sr | 1,415 | 458 | 2,331 | 2,513 | 0.0008 |
Ba | 1,361 | 458 | 2,277 | 2,373 | 0.006 |
Compounds of the form MF2:
The bifluorides contain the two fluorine atoms in a covalently bound HF2− polyatomic ion rather than as F− anions.
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