Another Example for the Ability of the $\rm SbS^{3-}_{3}$ Anion to act as a Bidentate Ligand: Solvothermal Synthesis,Crystal Structure,Calculated and Experimental Raman Spectra of [Cr(tren)SbS3]·H2O

The new charge neutral complex Cr(tren)SbS₃]·H₂O was synthesized under solvothermal conditions applying CrCl₃·6H₂O, Sb₂S₃, and S as starting material in an aqueous tren solution (tren = tris(2‐aminoethyl)amine)). The compound crystallizes in the non‐centrosymmetric space group P2₁2₁2₁ with a = 8.7779(15), b = 10.7122(17), c = 15.4286(18) Å, V = 1450.8(4) ų. In the structure the Cr³⁺ ion is surrounded by four N atoms of the amine molecules and by two S atoms of a trigonal pyramidal SbS₃]^3? group, i.e., the latter acts as a bidentate ligand. A three‐dimensional network is formed via hydrogen bonds between the complexes and water molecules. The main resonances in the Raman spectrum can be explained on the basis of calculated data. The most intense band is due to the Sb‐S stretching vibration. The thermal properties were investigated by DTA‐TG measurements. On heating Cr(tren)SbS₃]·H₂O decomposes in two distinct steps. The first step corresponds to the removal of the water molecules and the second step to the loss of the tren ligand.