Binuclear CuLn complexes (Ln(III) = Gd, Tb, Dy) of alcohol-functionalized bicompartmental Schiff-base ligand. Hydrogen bonding and magnetic behaviors

Fatima Zohra Chiboub Fellah (1, 2, 3) , Soumia Boulefred (4) , Abdelghani Chiboub Fellah (4) , Bahjat El Rez (2, 3) , Carine Guyard-Duhayon (2) , J.-P. Sutter (2)

1 Laboratoire de Chimie Inorganique et Environnement, Université de Tlemcen
2 LCC - Laboratoire de chimie de coordination
3 UT3 - Université Toulouse III - Paul Sabatier
4 VRE - Laboratoire de Valorisation des Ressources en Eau (V.R.E), Université de Tlemcen

Preparation, crystal structures and magnetic properties of a series of four binuclear Cu-Ln complexes are reported (Ln = Gd-III, Tb-III, and Dy-III). These are based on a bicompartmental Schiff-base ligand formed by condensation of 1,3-diaminopropan-2-ol with ortho-vanillin. This Schiff-base is known to usually involve its deprotonated alcohol group in metal coordination, which is not the case here. Instead the OH unit is engaged in H-bonding interactions. Intra-and inter-molecular H-bonds are formed when the alcohol group is located in axial position of the six-member ring formed by the diamino moiety and the Cu atom. In equatorial position, this group is only involved in intermolecular bonding. The corresponding Cu-Tb derivative is shown to behave as a Single Molecule Magnet with Delta k(B) = 24.6 K and tau(0) = 2.1 x 10(-8) s (HDC = 1.5 kOe).

Domaines: Chimie de coordination

Fatima Zohra Chiboub Fellah, Soumia Boulefred, Abdelghani Chiboub Fellah, Bahjat El Rez, Carine Guyard-Duhayon, et al.. Binuclear CuLn complexes (Ln(III) = Gd, Tb, Dy) of alcohol-functionalized bicompartmental Schiff-base ligand. Hydrogen bonding and magnetic behaviors. Inorganica Chimica Acta, 2016, 439, pp.24-29. ⟨10.1016/j.ica.2015.09.032⟩. ⟨hal-01935873⟩