Acta Crystallographica Section C

Crystal Structure Communications

Volume 58, Part 6 (June 2002)

Acta Cryst. (2002). C58, m330-m333    [doi:10.1107/S010827010200690X]

New structures in the bipyridine-copper(II) nitrate-methanol system: [(bpy)₂Cu(NO₃)]NO₃·CH₃OH and [(bpy)₂Cu(NO₃)]NO₃

P. Y. Zavalij, B. L. Burton and W. E. Jones

Abstract: Reaction of 2,2'-bipyridine (bpy) and copper(II) nitrate in methanol results in two complexes, namely light-blue bis(2,2'-bipyridine)nitratocopper(II) nitrate methanol solvate, [Cu(NO₃)(C₁₀H₈N₂)₂]NO₃·CH₃OH, (I), which is unstable in air, and the product of its decomposition, catena-poly[[[bis(2,2'-bipyridine)copper(II)]--nitrato-O:O'] nitrate], {[Cu(NO₃)(C₁₀H₈N₂)₂]NO₃}_n, (II). The crystal structures of both compounds were determined from one crystal at room temperature. Later, the structure of (I) was redetermined at low temperature. In (I) and (II), the Cu atom is coordinated by two bpy and one or two nitrate ions, respectively. The second nitrate ion in (I), along with the methanol solvent molecule, is found in the outer coordination sphere, not bonded to Cu. The nitrate in (I) is chelating, while in (II), it bridges (bpy)₂Cu complexes, forming a one-dimensional chain structure. The Cu cation in (II) lies on a twofold axis and the uncoordinated NO₃^- ion is located close to a twofold axis and is therefore disordered. Compound (I) converts into (II) upon loss of solvent.

Formula: [Cu(NO₃)(C₁₀H₈N₂)₂]NO₃·CH₄O and [Cu(NO₃)(C₁₀H₈N₂)₂]NO₃

Online 11 May 2002

	Structure factor file (CIF format) (326.7 kbytes) Contains datablock I
	Structure factor file (CIF format) (81.2 kbytes) Contains datablock II

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