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The title compound has been prepared by the reaction o f [WCl 4 (NSeCl)] 2  with PPh 4 Cl in CH 2 Cl 2  solution. It forms red crystals, which were characterized by an X-ray structure determination. Space group P2 1 /c, Z = 4, 3856 observed unique reflections, R = 0.073. Lattice dimensions at 25 °C: a = 2266.0(5), b = 1121.0(2), c = 2013.0(4) pm, β = 109.66(3)°. The structure consists o f PPh 4  +  ions and anions [WCl 5 (NSeCl 2 )] 2- , in which the tungsten atom is surrounded in a distorted octahedral way by five chlorine atoms and by the nitrogen atom of the (NSeCl 2 ) 3-  ligand. The W = N = SeCl 2  group is characterized by WN and SeN double bonds; the selenium atom has a pseudo trigonal-bipyramidal coordination with the N atom and two lone pairs in equatorial and the chlorine atoms in axial positions.

zeitschrift für naturforschung b

Synthese und Kristallstruktur des Dichloroselenonitren-Komplexes (PPh 4 ) 2 [WCl 5 (NSeCl 2 )] / Synthesis and Crystal Structure of the Dichloro-selenonitrene Complex (PPh 4 ) 2 [WCl 5 (NSeCl 2 )]