Preparation and crystallographic characterization of the polyphosphate TlPO3

Chemical preparation and crystallographic data are specified for thallium polyphosphate. TlPO₃ crystallizes in the monoclinic system, space group P2₁/n, with the following unit-cell parameters: a = 12.270(7) Å; b = 4.263(2) Å; c = 6.328(4) Å; β = 96°.72(3); Z = 4. This compound is isotypic with two previously described polyphosphates, namely RbPO₃ and CsPO₃.