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1 Polish Journal of Chemistry

1 1998

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Preparation of cis-[Cr(N3)(bpy)2(H2O)]2(+) complex and studies on a composite mechanism of its aquation stimulated by Cr(2+)(aq)-ions

Katafias A., Kita P., Madej E.

Polish Journal of Chemistry

1998

Vol. 72, nr 3

595-606

Anation of cis-[Cr(bpy)2(H2O)2](3+) ion (bpy=2,2'-bipyridine) in NH3/N3(-) media gives a novel very inert monoazidocomplex whose formula and structure can be proposed as cis-[Cr(N3)(bpy)2(H2O)](2+). This complex decomposes rapidly by addition of Cr(2+)(aq) into a dereated acidic solution. Analysis of the reaction products and the kinetics suggests an electron transfer Cr(II)-Cr(III) via competitive reaction pathways: inner-sphere through Cr(III)-N3-Cr(II) intermediate, outer-sphere and/or perhaps also via a more direct interaction of Cr(II) with pi-ring of the coordinated bipyridine.