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types of mononuclear complexes [M(HL)]ϩ and [ML]
[M = CuII or NiII] with a N3OM chromophore, the oxygenated
end (OH and O) of the oxime group remaining uncomplexed.
Owing to the strong ligand field, the neutral complexes [ML]
are not involved in a self-assembling process but can function
as ‘ligand complexes’ to afford homo- and hetero-di- and
tri-nuclear complexes.
(ii) The structural study of a dinuclear complex of the [LCu-
CuLn] type (Ln being an auxiliary ligand) shows that the CuL
moiety actually behaves as a bridging bidentate ligand for the
second copper ion, co-ordinating at an equatorial site via the
oxygen atom of the deprotonated oxime group and an axial site
via the ketonic oxygen.
(iii) Generalizing the structure of the Cu[O,NO]Cu core to
the CuIINiII, CuIICrIII and CuIIMnII pairs leads to a explan-
ation of the magnetic properties and, more particularly, the
unexpected antiferromagnetic behaviour of the CuIICrIII pair.
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Acknowledgements
We thank Dr. A. Mari for his contribution to the magnetic
measurements, Dr. A. Bousseksou for providing the fitting pro-
gram used in this work and Dr. S. Richelme (Service Commun
de Spectroscopie de Masse) for her help with the mass spectral
measurements.
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Received 20th November 1997; Paper 7/08374B
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J. Chem. Soc., Dalton Trans., 1998, Pages 1307–1314