Ammonium dipotassium hydrogen di­fluoro­phosphate at room temperature

✍ Scribed by Fábry, Jan ;Krupková, Radmila ;Císařová, Ivana

• Publisher: International Union of Crystallography
• Year: 2003
• Tongue: English
• Weight: 283 KB
• Volume: 59
• Category: Article
• ISSN: 1600-5368
• DOI: 10.1107/s160053680300117x

✦ Synopsis

NH 4 ) 0.926 K 2.074 [H(PO 3 F) 2 ] crystallized from aqueous solution after mixing stoichiometric amounts of (NH 4 ) 2 PO 3 F and K 2 PO 3 F in a 1:1 ratio. The structure contains two sites that are occupied by symmetry-independent cations; one site is occupied by potassium and ammonium in an approximate 1:1 ratio, while the other cation site is occupied exclusively by K. The anions are connected by a very short symmetry-restricted OÁ Á ÁHÁ Á ÁO hydrogen bond ($2.47 A Ê ) into pairs [H(PO 3 F) 2 ] 3À . Ammonium is connected to anion O atoms by two-and three-centred NÐHÁ Á ÁO hydrogen bonds. Fluorines do not take part in the hydrogen-bond pattern.