A new modification of diammonium hexafluorosilicate, (NH4)(2)SiF6

Authors
Fabry, J Chval, J Petricek, V
Citation
J. Fabry et al., A new modification of diammonium hexafluorosilicate, (NH4)(2)SiF6, ACT CRYST E, 57, 2001, pp. I90-I91
Citations number
10
Categorie Soggetti
Physical Chemistry/Chemical Physics
Journal title
ACTA CRYSTALLOGRAPHICA SECTION E-STRUCTURE REPORTS ONLINE
ISSN journal
16005368 → ACNP
Volume
57
Year of publication
2001
Part
10
Pages
I90 - I91
Database
ISI
SICI code
1600-5368(200110)57:<I90:ANMODH>2.0.ZU;2-R
Abstract
A hexagonal modification (P6(3)mc) of (NH4)(2)SiF6 was grown accidentally. This new modification has the unit-cell c parameter doubled with respect to a previously reported trigonal form (P (3) over bar m1) of the title compo und. The H atoms in the present structure are ordered. Three or even four F atoms are hydrogen-bond acceptors for each H atom. The structure is isostr uctural with modifications of (NH4)(2)MnF6, K2GeF6 and Rb2GeF6.