SE2NBR3, SE2NCL5, SE2NCL6- - NEW NITRIDE HALIDES OF SELENIUM(III) ANDSELENIUM(IV)

Se2NBr3, a planar molecule shaped liked dividers, was formed by the re action of SeBr4 with N(SiMe(3))(3), which reduced the selenium to the trivalent state. Under the same conditions, Se2NCl5 was obtained by th e reaction of SeCl4 with N(SiMe(3))(3), retaining the tetravalent stat e of selenium. The molecule is formed by two edge-sharing pseudotrigon al bipyramids with selenium as their central atoms. Se2NCl5 reacts wit h PPh(4)Cl to form the Se2NCl6- ion by the addition of a Cl- ion to on ly one of the two selenium atoms, resulting in pseudooctahedral coordi nation of this atom. Ab initio calculations for all the compounds repo rted confirm the experimentally determined structures.