In the absence of crystals of suitable quality, the crystal structures of five [MX(2)(bipy)] (M = Ni or Cu; X = Cl or Br; bipy = 4,4'-bipyridyl) phases were determined, nb initio, from powder diffraction data. The nickel compounds contain symmetrically bridging halides and trans-D-4h octahedrally co-ordinated metal atoms; on the contrary, the co-ordination about the copper atoms in [CuBr2(bipy)] is square planar, with long Cu ... Br contacts in the axial direction, due to Jahn-Teller distortion. Interestingly, [CuCl2(bipy)] is dimorphic; both in the orthorhombic and in the monoclinic phases, the copper co-ordination is substantially square planar as in the bromide analogue, but none of the two phases is isomorphous to it.

Ab-initio X-ray powder diffraction structural characterization of co-ordination compounds: Polymeric [{MX2(bipy)}n] complexes (M = Ni or Cu; X = Cl or Br; bipy = 4,4′-bipyridyl) / N. Masciocchi, P. Cairati, L. Carlucci, G. Mezza, G. Ciani, A. Sironi. - In: JOURNAL OF THE CHEMICAL SOCIETY DALTON TRANSACTIONS. - ISSN 0300-9246. - :13(1996), pp. 2739-2746.

Ab-initio X-ray powder diffraction structural characterization of co-ordination compounds: Polymeric [{MX2(bipy)}n] complexes (M = Ni or Cu; X = Cl or Br; bipy = 4,4′-bipyridyl)

L. Carlucci;G. Ciani;A. Sironi
1996

Abstract

In the absence of crystals of suitable quality, the crystal structures of five [MX(2)(bipy)] (M = Ni or Cu; X = Cl or Br; bipy = 4,4'-bipyridyl) phases were determined, nb initio, from powder diffraction data. The nickel compounds contain symmetrically bridging halides and trans-D-4h octahedrally co-ordinated metal atoms; on the contrary, the co-ordination about the copper atoms in [CuBr2(bipy)] is square planar, with long Cu ... Br contacts in the axial direction, due to Jahn-Teller distortion. Interestingly, [CuCl2(bipy)] is dimorphic; both in the orthorhombic and in the monoclinic phases, the copper co-ordination is substantially square planar as in the bromide analogue, but none of the two phases is isomorphous to it.
magnetic-properties; crystal-structure; pyrazine; 4,4'-bipyridine; sheets; refinement; adducts; bridges; cobalt
Settore CHIM/03 - Chimica Generale e Inorganica
JOURNAL OF THE CHEMICAL SOCIETY DALTON TRANSACTIONS
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2434/187279
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