[ReCl2(NS)(NSCl)(Pyridin)2], ein Thionitrosyl-chlorthio-nitrenkomplex des Rheniums

[ReCl₂(NS)(NSCl)(Pyridine)₂], a Thionitrosyl-chlorothionitrene Complex of Rhenium The title compound was obtained by the reaction of pyridine with either [ReCl₃(NSCl)₂POCl₃] or [ReCl₃(NSCl)₂]₂ · (μ-N₂S₂) under the reducing action of dichloromethane. It is slightly soluble in CH₂Cl₂, from which it can be obtained in form of black crystals. The IR spectrum is reported. The crystal structure of [ReCl₂(NS)(NSCl)(Pyridine)₂] was determined by X-ray diffraction (R = 0.027 for 2105 observed reflexions). Crystal data: a = 1551.6, b = 694.9, c = 1513.2 pm, β = 96.50°, space group P2₁/c, Z = 4. In the monomer molecules, each rhenium atom has a distorted octahedral coordination of two cis-chlorine atoms, two cis-nitrogen atoms of the pyridine ligands and two cis-nitrogen atoms of the thionitrosyl and chloro thionitrene ligands. One of the pyridine groups is in trans position to the nearly linear thionitrosyl group (angle ReNS 176°) with distances ReN of 177 pm and NS of 152 pm. However, in the trans position of the chlorothionitrene group (angle ReNS 159°, distances ReN 189 pm, NS 149 pm) a chlorine atom is found.