New Quaternary Alkali‐Metal Hypodiphosphate Hydrates: Preparation, Crystal Structure, Vibrational Spectrum, and Thermal Behavior of K₄P₂O₆·8H₂O and Na₂K₂P₂O₆·8H₂O in Comparison to Na₄P₂O₆·10H₂O

Abstract

Single crystals of the alkali-metal hypodiphosphates K 4 P 2 O 6 ·8H 2 O (1) and Na 2 K 2 P 2 O 6 ·8H 2 O (2) could be obtained and their crystal structures determined. The compounds 1 and 2 crystallize isotypic in the orthorhombic space group Pbca (no. 61) with four formula units in the unit cell. The crystal structures are built up by discrete [P 2 O 6 ] 4units in an ethane-like staggered conformation, by the corresponding alkali-metal cations and water molecules. FT-IR/FIR

Preparation, Crystal Structure and Vibrational Spectra of Ca2P2O6·2H2O and [Ca(H2O)3(H2P2O6)]·0.5(C12H24O6)·H2O

“…The hydrogen bond lengths between O atoms of water molecules and O atoms of the [P 2 O 6 ] 4– anions range from 2.652(1) to 2.869(1) Å and the angles O–H ··· O range from 164.2(1) to 166.0(1)° (Table ). These values agree well with those reported for K 4 P 2 O 6 · 8 H 2 O indicating effective hydrogen bonding.…”

“…A considerable number of alkaline metal hypodiphosphates have been characterized in the last few years Up until today the described alkaline metal hypodiphosphates have only academic interest, with the exception of sodium and ammonium dihydrogen hypodiphosphates . Sodium dihydrogen hypodiphosphate finds practical interest in analytical chemistry not only for the quantitative determination of hypodiphosphoric acid, but also for the gravimetric precipitation and immobilization of uranium(IV) as UP 2 O 6 · 4H 2 O and UP 2 O 7 and of other heavy transition metals e.g.…”

Preparation, Crystal Structure, Vibrational Spectra, and Thermal Behavior of Tl2H2P2O6 and Tl4P2O6

“…The P-P central bond links two PO 3 groups with P-O distances from 1.535 to 1.543 Å ( Table 2). The bond lengths and angles are well within the expected ranges and are comparable to those found for the respective hypodiphosphates, Li 4 P 2 O 6 ·6H 2 O, [8] Na 4 P 2 O 6 ·10H 2 O, [17] Na 2 K 2 P 2 O 6 ·8H 2 O, K 4 P 2 O 6 ·8H 2 O, [11] Co 2 P 2 O 6 ·12H 2 O [18] and Ni 2 P 2 O 6 ·12H 2 O. [19] www.zaac.wiley-vch.de ARTICLE Figure 6.…”

“…[2] Furthermore the ferroelectricity of (NH 4 ) 2 P 2 O 6 is recently discovered. [3] On the basis of the acidity of the hypodiphosphoric acid [4] the crystal structures of Na 2 [5][6][7][8][9] as well as those of potassium salts [10,11] and very recently the structure of rubidium salt. [12] Herein, we report the synthesis, the single-crystal structures, the IR/Raman spectra, and thermogravimetric (TG) measurements of thallium hypodiphosphates(IV) Tl 2 H 2 P 2 O 6 (1) and Tl 4 P 2 O 6 (2).…”

Electron density distribution in tetralithium hypodiphosphate hexahydrate, Li4P2O6·6H2O

“…Recently hypodiphosphates have attracted attention due to the discovery of ferroelectric properties in diammonium dihydrogen hypodiphosphate, (NH 4 ) 2 H 2 P 2 O 6 (Szklarz et al, 2011). Although several studies have afforded new structural data on some alkali metal salts [RbH 3 P 2 O 6 and CsH 3 P 2 O 6 , Wu et al, 2012; Na 2 K 2 P 2 O 6 Á8H 2 O and K 4 P 2 O 6 Á8H 2 O, Gjikaj et al, 2012; KH 3 P 2 O 6 , K 2 H 2 P 2 O 6 ÁH 2 O, K 2 H 2 P 2 O 6 Á2H 2 O, K 5 (HP 2 O 6 )-(H 2 P 2 O 6 )Á2H 2 O, K 3 HP 2 O 6 Á4H 2 O and K 4 P 2 O 6 Á4H 2 O, Szafranowska et al, 2012], the overall crystallochemical knowledge of hypodiphosphate compounds is still much less comprehensive than that of closely related (oligo)phosphates. The most remarkable difference between hypodiphosphates and other phosphates is the presence of direct P-P bonds.…”