The structure of antimony(III) phosphite

Abstract

Abstraet. Sb2(HPO3)3, Pi, a= 9.182 (1), b= 8.353(1), c=7.220(1)A, , =68.21(1), ~= 79.52(1), y=66.47(1) ° at 297 K, Z=2, D o= 3.33 (4) at 296 K, D c = 3.41 Mg m -3. R = 0.020 for 2150 reflexions. The structure consists of isolated HPO 3 tetrahedra and Sb atoms coordinated to four O atoms.Introduction. The title compound was studied as part of an investigation of phosphites. Reaction of antimony trioxide with a concentrated aqueous solution of phosphorous acid (3.5 mmol Sb20 3, 30-150 mmol H3PO 3, and water to 15 ml) gave a voluminous precipitate from which, after standing for more than one year at 298 K, brownish crystals of the title compound were obtained (Vojti~ek, 1979), with well developed faces { 100} and {011 } of maximum prism dimensions 0.3 x 0.3 x 0.5 mm. 4428 intensities were collected (co/20 scan) in the range 3 _< 20 _< 55 ° from a crystal of volume 0.0157 mm 3 on a Stoe four-circle diffractometer with graphite-monochromated Mo Ka radiation (2 = 0.71069A). 2163 reflexions were unique; those with F < 2a(F) were treated as unobserved. The remaining 2150 reflexions were corrected for Lp and absorption effects (/~ = 6.24 mm-~).The

Bis(ammonium) tris(hexaaquamagnesium) tetrakis(hydrogen phosphite)

“…The PÐO bond length of 1.529 (2) A Ê is in good agreement with the distance of 1.519 A Ê obtained from theoretical calculations (Farrar & Trudeau, 1990) for an isolated phosphite anion. The PÐH distances (1.296 and 1.294 A Ê ) compare favourably with the value calculated by statistical evaluation of the geometry of inorganic phosphites (1.30 A Ê ; Loub, 1991). They are also comparable with the PÐH distances in Fe 11 (HPO 3 ) 8 (OH) 6 (1.298 A Ê ) and Mn 11 (HPO 3 ) 8 (OH) 6 (1.29 A Ê ) (Att®eld et al, 1994), and in NaMg(H 2 PO 3 ) 3 ÁH 2 O (1.29 A Ê ; Ouarsal et al, 2003), but are shorter than those found in other phosphites, such as LiTl(HPO 3 ) (1.37 A Ê ; Ra®q et al, 1981) and [Mg(H 2 O) 6 ](HPO 3 ) (1.399 A Ê ; Powell et al, 1994).…”

Synthesis and Structures of a Layered and a Tubular Antimony(III) Phosphonate

“…In all three phosphonate systems, the introduction of a small cation favors a tubular material over a layered material. The small cation could also be necessary for formation of the [SbO E] spiro-5 units: the unit is found in NaSb O (PO ) , while the few reported antimony(III) phosphates/phosphonates/phosphites synthesized hydrothermally in the absence of cations (6,41,42) contain only even-membered rings (Sb P , Sb P , Sb P , 2 ) or edge-sharing odd-membered rings. Certainly, more Sb P rings and [SbO E]-based spiro-5 motifs will be found, though it remains to be seen if the presence of these units will lead to nanoporous open antimony(III) phosphate/phosphonate frameworks.…”

Pb2Cl2(HPO3)(H2O) and Pb3Br2(HPO3)2: Two Phosphite Halides with 3D Structural Networks and Enlarged Birefringence

“…Hence, to improve the birefringence of compounds built by tetrahedral units would be significant for excavating functional crystal materials. Similar to popular phosphate crystalline materials, phosphites also can form diverse tetrahedral units but are less researched than nonlinear optical and birefringent crystals. − Inspired by the achievement of large birefringence in phosphate systems induced by SCALP cations, we have been focused on the phosphites containing cations with lone pair electrons. Up to date, the above inorganic phosphites including Pb 2 (HPO 3 ) 2 , SnHPO 3 , and Pb 2 (HPO 3 )­(NO 3 ) 2 are few, and the birefringence has been less investigated. − …”