Abstract
Two new compounds KTiPS5and RbTIPS5have been synthesized through reactions of the elements with alkali metal halide fluxes. KTiPS5crystallizes in the space groupC32h−C2/mof the monoclinic system with four formula units in a cell of dimensionsa= 17.678(8),b= 7.080(4),c= 6.325(3) Å, β = 97.99(4)°. RbTiPS5crystallizes in the space groupC32h−C2/mof the monoclinic system with eight formula units in a cell of dimensionsa= 18.159(7),b= 7.081(3),c= 15.352(6) Å, β = 124.07(2)°. The structures of both compounds have been determined by single crystal X-ray techniques. Both structures consist of one-dimensional1∞[TiPS−5] chains separated from one another by K+or Rb+cations. The linear chains are built up from the basic repeating unit, [Ti2(PS4)2S2−2], which is composed of two edge-shared TiS6octahedra and two PS4tetrahedra. There is no interchain bonding except the van der Waals interactions. The classical charge of the two compounds can be represented by [A+][Ti4+][PS3−4][S2−] (A= K or Rb).
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