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Reaction of Non-Symmetric Schiff Base Metallo-Ligand Complexes Possessing an Oxime Function with Ln Ions

1
Laboratoire de Chimie de Coordination du CNRS, 205, route de Narbonne, BP 44099, Toulouse CEDEX 4 F-31077, France
2
Université de Toulouse, UPS, INPT, Toulouse CEDEX 4 F-31077, France
3
Petru Poni, Institute of Macromolecular Chemistry, Aleea Grigore Ghica Voda 41A, Iasi 700487, Romania
4
Departamento de Química, Facultad de Ciencias, Universidad de Burgos, Plaza Misael Bañuelos s/n, Burgos 09001, Spain
*
Author to whom correspondence should be addressed.
Inorganics 2018, 6(1), 33; https://doi.org/10.3390/inorganics6010033
Received: 29 January 2018 / Revised: 19 February 2018 / Accepted: 23 February 2018 / Published: 9 March 2018
(This article belongs to the Special Issue Schiff-Base Metal Complexes)
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Abstract

The preparation of non-symmetric Schiff base ligands possessing one oxime function that is associated to a second function such as pyrrole or phenol function is first described. These ligands, which possess inner N4 or N3O coordination sites, allow formation of cationic or neutral non-symmetric CuII or NiII metallo-ligand complexes under their mono- or di-deprotonated forms. In presence of Lanthanide ions the neutral complexes do not coordinate to the LnIII ions, the oxygen atom of the oxime function being only hydrogen-bonded to a water molecule that is linked to the LnIII ion. This surprising behavior allows for the isolation of LnIII ions by non-interacting metal complexes. Reaction of cationic NiII complexes possessing a protonated oxime function with LnIII ions leads to the formation of original and dianionic (Gd(NO3)5)2− entities that are well separated from each other. This work highlights the preparation of well isolated mononuclear LnIII entities into a matrix of diamagnetic metal complexes. These new complexes complete our previous work dealing with the complexing ability of the oxime function toward Lanthanide ions. It could open the way to the synthesis of new entities with interesting properties, such as single-ion magnets for example. View Full-Text
Keywords: non-symmetric Schiff bases; synthesis; oxime function; 3d–4f complexes; structural determinations non-symmetric Schiff bases; synthesis; oxime function; 3d–4f complexes; structural determinations
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Costes, J.-P.; Dahan, F.; Dupuis, A.; Shova, S.; Tojal, J.G. Reaction of Non-Symmetric Schiff Base Metallo-Ligand Complexes Possessing an Oxime Function with Ln Ions. Inorganics 2018, 6, 33.

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