The Alkali Hypophosphites KH₂PO₂, RbH₂PO₂ and CsH₂PO₂.

Abstract

Structure Structure D 2000The Alkali Hypophosphites KH 2 PO 2 , RbH 2 PO 2 and CsH 2 PO 2 . -The structures of the title compounds are determined by single crystal XRD. KH 2 PO 2 crystallizes in the monoclinic space group C2/c with Z = 4 and the isomorphous compounds RbH2PO2 and CsH2PO2 crystallize in the orthorhombic space group Pnma with Z = 4. All three compounds adopt layer structures of alkali cations and hypophosphite anions. The latter bridge four cations within the same layer. The H 2 anion has distorted tetrahedral geometry. -(NAUMOVA, M. I.; KURATIEVA, N. V.; PODBEREZSKAYA, N. V.; NAUMOV*, D. Y.; Acta Crystallogr., Sect. C: Cryst. Struct. Commun. 60 (2004) 5, i53-i55; Inst. Inorg. Chem., Sib. Branch, Russ. Acad. Sci., Novosibirsk 630090, Russia; Eng.) -Schramke 33-012 PO -2

NaCo(H2PO2)3: Crystal structure and physical study

“…We found reports on several hypophosphites of transition metals and lanthanides [1e7], and few mixed hypophosphites: NaCa(H 2 PO 2 ) 2 [8] and Co 0.5 (H 2 O) 6 Ni 0.5 (H 2 PO 2 ) 2 [9]. Several other simple phases are known, e.g., AH 2 PO 2 , A ¼ K, Rb, Cs [10], Mg(H 2 O) 6 (H 2 PO 2 ) 2 [11], Mn(H 2 PO 2 ) 2 .H 2 O [12], Co(H 2 O) 6 (H 2 PO 2 ) 2 [9,13], and Cu(H 2 PO 2 ) 2 [14]. Some powder crystallographic data are also known: M(H 2 PO 2 ) 2, Co(H2PO2)2.0.53H2O [15], and VO(H 2 PO 2 ) 2 .H 2 O [16].…”