[P(NH2)4]Br and [P(NH2)4][NO3] have been prepared by anion exchange in liquid ammonia. Single crystals of [P(NH2)4]Br were obtained from an acetonitrile solution in a temperature gradient between 60 °C and room temperature while attempts to grow single crystals of [P(NH2)4][NO3] yielded [P(NH2)4][NO3](OP(NH2)3). Both crystal structures were determined by single crystal X-ray methods at room temperature ([P(NH2)4]Br: P4/nbm, a = 809.2(1), c = 468.1(1) pm, Z = 2, R1 = 0.042, wR2 = 0.077; [P(NH2)4][NO3](OP(NH2)3): Pna21, Z = 4, a = 1023.4(1), b = 1704.7(1), c = 618.0(1) pm, R1 =0.025, wR2 = 0.067. In the solid [P(NH2)4]Br forms a tetragonally distorted variant of the CsCl type of structure. [P(NH2)4][NO3](OP(NH2)3) consists of [P(NH2)4]+cations, [NO3]- anions, and OP(NH2)3 molecules which are interconnected by a complex system of hydrogen bonds.
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