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O.V. Nesterova, S. Petrusenko, D. Nesterov, V. Kokozay, B.W. Skelton, J. Jezierska, W. Linert, A. Ozarowski:
"A Cu(II)-Ni(I)I Complex with Ethylenediamine: Crystal Structure and Ferromagnetic Behaviour of an Aqua-Bridged Heterometallic Chain Containing Ambidentate Ni(OAc)42- Blocks";
European Journal of Inorganic Chemistry, 22 (2010), S. 3529 - 3535.

A one-pot reaction of copper powder and nickel and ammo- nium acetates in a CH3OH solution of ethylenediamine (en) yields a unique 1D aqua-bridged polymer [Cu(en)2(μ2-H2O)2- Ni(OAc)4]n·4nH2O (1) with an ambidentate Ni(OAc)42- frag- ment that has not been previously characterized. The basic structural motif of 1 contains a previously unreported hetero- metallic M(μ2-H2O)M􏰀 aqua-bridge chain with alternating metal atoms. A complex system of N/O-H···O hydrogen bonds strengthens the polymeric chains and links them into a supramolecular three-dimensional network. Variable-tem- perature magnetic susceptibility measurements of 1 revealed a weak ferromagnetic coupling (J = 1.1 cm-1) between the paramagnetic copper(II) and nickel(II) ions, which is trans- mitted through the oxygen bridges.

Copper / Nickel / Chain structures / Direct synthesis / Ferromagnetic behaviour / High-field EPR spectroscopy

http://dx.doi.org/10.1002/ejic.201000212