Abstract
Crystalline K2NiP2O7 (I): monoclinic, P21,a=9.230(2),b=17.540(8),c=8.319(9)Å, β=91.44(2)°,Z=8,d calc=3.067 g cm−3, λMoK α=0.71069Å,R/R w=6.5/9.4%, is characterized by the existence of face sharing NiO6 octahedra with Ni−Ni separation of 2.827 Å (Ni−O; 1.93(2)–2.17(2)Å). K+ is seen in sites of seven, six, and fivefold coordination (K−O, averages; 2.83(2), 2.81(2), and 2.77(2)Å, respectively) P2O7 4− groups are observed in semieclipsed conformation. K6Sr2Ni5(P2O7)5 (II) crystallizes in monoclinic space group P21/c;a=11.038(7),b=9.533(13),c=7.438(2)Å, β=100.13(4)°,D calc=3.309 g cm−3,Z=2,R/R w=6.4/8.1%. Nickel atoms are distributed on planes parallel to the crystallographic (100) plane at χ=0 and χ=0.5. On the planes, χ=0, Ni2+ ions form successive linked trimers of edge sharing NiO6 octahedra (Ni−Ni, 3.018(1), 3.008(1)Å; Ni−O, av 2.07(2)Å). The intermediate planes (χ=0.5) contain isolated and six coordinate Ni2+ ions (Ni−O av. 2.09(2)Å). Seven-coordinate potassium ions (K−O, av. 2.74(2)Å) are located on intermediate planes at χ=0.25 and 0.75. P2O7 4− groups are found in eclipsed conformation. Strontium atoms are located between nickel and potassium planes and are surrounded by seven oxygen atoms (Sr−O, av. 2.586(2)Å).
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ElMaadi, A., Boukhari, A. & Holt, E.M. Crystal structures of the new diphosphates, K2NiP2O7 and K6Sr2Ni5(P2O7)5 . J Chem Crystallogr 25, 531–536 (1995). https://doi.org/10.1007/BF01667020
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DOI: https://doi.org/10.1007/BF01667020