Structural investigations of two bismuth‐ammonium condensed phosphates: BiHNH4P3O10 and BiNH4(PO3)4

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Abstract
Chemical preparations and crystal structures are described for two new bismuth salts: BiHNH4P3O10 and BiNH4(PO3)4. The first one is a new type of tripolyphosphate, while the second one, a long chain polyphosphate, is isostructural with RbNd(PO3)4 and some other MILn(PO3)4 compounds.BiHNH4P3O10 is triclinic, P1, with a = 7.032(8), b = 7.696(4), c = 8.659(3) Å, α = 106.20(4), β = 105.86(4), γ = 82.78(4)°, Z = 2, V = 432.3 Å3, Dx = 3.694.BiNH4(PO3)4 is monoclinic, P21/n, with a = 10.925(9), b = 9.034(8), c = 10.438(9) Å, β = 106.18(4), Z = 4, V = 989.4 Å3, Dx = 3.644.The crystal structure of BiHNH4P3O10 has been solved by using 4253 independent reflexíons with a final R value of 0.056. The unit cell contains two P3O105− groups related by an inversion center while bismuth atoms in a eightfold coordination build infinite chains of edge‐sharing BiO8 polyhedra running parallel to the a axis. The crystal structure of BiNH4(PO3)4 has been solved using 4330 independent reflexions with a final R value of 0.047. Infinite (PO3)∞ chains spread along the [101] direction, alternating with isolated BiO8 polyhedra.

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