A tetranuclear hydroxo-bridged copper(II) complex with primary N-acylamidines as ligands: Preparation, structural, and magnetic characterisation

Eberhardt JK, Glaser T, Hoffmann RD, Frohlich R, Wurthwein EU (2005)
European Journal of Inorganic Chemistry 2005(6): 1175-1181.

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Abstract
The reaction of N-pivaloylbenzamidine (1a) and tetrakis(acetonitrile)copper(1) hexafluorophosphate in the presence of air yields a hydroxo-bridged copper(II) complex (4). The product was characterised by X-ray diffraction analysis and found to be a cubane-like dimeric complex consisting of two square dimers with the formula [{(1a)2Cu(2)(OH)(2)}(2)](PF6)(4)center dot 4CH(2)Cl(2) (4(.)4 CH2Cl2) with cupric ions and hydroxyl oxygen atoms at alternating vertices of a cube. The complex can be described as consisting of two [ligand-Cu-(OH)(2)-Cu-ligand] units held together by long out-of-plane Cu-O bonds, creating a tetrameric entity with a Cu-4(OH)4 core. Each cupric ion is essentially square-pyramidally coordinated, being bound to three OH bridges, one N atom of the amidine and one N-acylamidme 0 atom. The magnetic properties of this compound have been studied in the 2-300 K temperature range. The measurements revealed that the cupric ions in the cube are anti-ferromagnetically coupled. This observation has been rationalised on the basis of the structural data. (c) Wiley-VCH Verlag GmbH T Co.
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Eberhardt JK, Glaser T, Hoffmann RD, Frohlich R, Wurthwein EU. A tetranuclear hydroxo-bridged copper(II) complex with primary N-acylamidines as ligands: Preparation, structural, and magnetic characterisation. European Journal of Inorganic Chemistry. 2005;2005(6):1175-1181.
Eberhardt, J. K., Glaser, T., Hoffmann, R. D., Frohlich, R., & Wurthwein, E. U. (2005). A tetranuclear hydroxo-bridged copper(II) complex with primary N-acylamidines as ligands: Preparation, structural, and magnetic characterisation. European Journal of Inorganic Chemistry, 2005(6), 1175-1181.
Eberhardt, J. K., Glaser, T., Hoffmann, R. D., Frohlich, R., and Wurthwein, E. U. (2005). A tetranuclear hydroxo-bridged copper(II) complex with primary N-acylamidines as ligands: Preparation, structural, and magnetic characterisation. European Journal of Inorganic Chemistry 2005, 1175-1181.
Eberhardt, J.K., et al., 2005. A tetranuclear hydroxo-bridged copper(II) complex with primary N-acylamidines as ligands: Preparation, structural, and magnetic characterisation. European Journal of Inorganic Chemistry, 2005(6), p 1175-1181.
J.K. Eberhardt, et al., “A tetranuclear hydroxo-bridged copper(II) complex with primary N-acylamidines as ligands: Preparation, structural, and magnetic characterisation”, European Journal of Inorganic Chemistry, vol. 2005, 2005, pp. 1175-1181.
Eberhardt, J.K., Glaser, T., Hoffmann, R.D., Frohlich, R., Wurthwein, E.U.: A tetranuclear hydroxo-bridged copper(II) complex with primary N-acylamidines as ligands: Preparation, structural, and magnetic characterisation. European Journal of Inorganic Chemistry. 2005, 1175-1181 (2005).
Eberhardt, J. K., Glaser, Thorsten, Hoffmann, RD, Frohlich, R, and Wurthwein, EU. “A tetranuclear hydroxo-bridged copper(II) complex with primary N-acylamidines as ligands: Preparation, structural, and magnetic characterisation”. European Journal of Inorganic Chemistry 2005.6 (2005): 1175-1181.
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