Abstract
Potassium sodium copper(II) diphosphate(V), KNaCuP2O7, was synthesized by solid-state reactions. It crystallizes in the α-Na2CuP2O7 structure type in space group P21/n. In the crystal, CuO5 square-pyramids are linked to nearly eclipsed P2O7 groups by sharing corners to build up corrugated layers with composition [CuP2O7]2- that extend parallel to (010). The K+ and Na+ cations reside in the inter-layer space and are connected to nine and seven O atoms, respectively. The structural model was validated by bond-valence-sum (BVS) and charge-distribution (CHARDI) analysis.
Highlights
Several attempts were made to prepare crystals of the hypothetical solid solution K2–xNaxCuP2O7, with x in the range 0 to 2
All of the attempts led to a compound with x = 1, i.e. KNaCuP2O7, the crystal structure of which is reported in this communication
The title compound KNaCuP2O7 crystallizes isotypically with -Na2CuP2O7 (Erragh et al, 1995) and shows resemblance with one form of K2CuP2O7 (ElMaadi et al, 1995). It is built up by corrugated [CuP2O7]2À layers with the alkali cations situated in the interlayer space
Summary
The title compound KNaCuP2O7 crystallizes isotypically with -Na2CuP2O7 (Erragh et al, 1995) and shows resemblance with one form of K2CuP2O7 (ElMaadi et al, 1995) It is built up by corrugated [CuP2O7]2À layers with the alkali cations situated in the interlayer space. Each CuO5 polyhedron shares its vertices with two P2O74À anions, one of which is chelating and the other belongs to two different P2O7 groups (Fig. 2). This linkage leads to layers extending parallel to (010). The second site is smaller (‘S’) and is occupied by Na+ cations Its bond-valence sum is 0.98 valence units (Table 2)
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