Kristallstruktur und Schwingungsspektren des Thalliumhexathiometadiphosphates Tl2P2S6 / Crystal Structure and Vibrational Spectra of Tl2P2S6

Abstract

Tl₂P₂S₆ crystallizes in the orthorhombic system, space group Immm, Z = 2 with the lattice constants a = 793.2(4) pm, b = 689.2(4) pm, c = 901.9(5) pm. In the structure there are discrete P₂S₆ ^2- -anions. The P₂S₆ ^2- -ion was found to be a hexa-thiometadiphosphate group where the two P atoms are linked by two S bridges. Far infrared, infrared and Raman spectra of this compound have been recorded. The observed frequencies are assigned on the basis of P₂S₆ ^2- units with D_2h symmetry in analogy to the isoelectronic Al₂Cl₆