New platinum(II) complexes with benzo­thia­zole ligands

Four new platinum(II) complexes, namely tetra­ethyl­ammonium tri­bromido­(2-methyl-1,3-benzo­thia­zole-κN)platinate(II), [NEt(4)][PtBr(3)(C(8)H(7)NS)] (1), tetra­ethyl­ammonium tri­bromido­(6-meth­oxy-2-methyl-1,3-benzo­thia­zole-κN)platinate(II), [NEt(4)][PtBr(3)(C(9)H(9)NOS)] (2), tetra­ethyl­ammonium tri­bromido­(2,5,6-trimethyl-1,3-benzo­thia­zole-κN)platinate(II), [NEt(4)][PtBr(3)(C(10)H(11)NS)] (3), and tetra­ethyl­ammonium tri­bromido­(2-methyl-5-nitro-1,3-benzo­thia­zole-κN)platinate(II), [NEt(4)][PtBr(3)(C(8)H(6)N(2)O(2)S)] (4), have been synthesized and structurally characterized by single-crystal X-ray diffraction techniques. These species are precursors of compounds with potential application in cancer chemotherapy. All four platinum(II) complexes adopt the expected square-planar coordination geometry, and the benzo­thia­zole ligand is engaged in bonding to the metal atom through the imine N atom (Pt—N). The Pt—N bond lengths are normal: 2.035 (5), 2.025 (4), 2.027 (5) and 2.041 (4) Å for complexes 1, 2, 3 and 4, respectively. The benzo­thia­zole ligands are positioned out of the square plane, with dihedral angles ranging from 76.4 (4) to 88.1 (4)°. The NEt(4) cation in 3 is disordered with 0.57/0.43 occupancies.