 A simple route to dinuclear complexes of a sulfonamide ligand with a potential interest in the catalysis field Jesús Sanmartín-Matalobos,* Cristina Portela-García, Matilde Fondo and Ana M. García-Deibe Dpto. de Química Inorgánica, Fac. de Química, Univ. de Santiago de Compostela, Campus Vida, E-15782 Santiago de Compostela, Spain. E-mail: jesus.sanmartin@usc.es Abstract: We report here the straightforward synthesis of some d-block metal dimers of a Schiff base ligand obtained by condensation of 2-tosylaminomethylaniline with 4- formyl-3-hydroxybenzoic acid (H 2 L). The easy bideprotonation of both -OH and -HNSO 2 - groups, as well as a suitable N,N,O binding domain that can simultaneously bind two metal ions through μ 2 -N sulfonamido bridges have been considered during the design step of the Schiff base ligand. All the compounds synthesised were characterised by a combination of mass spectrometry, infrared spectroscopy, elemental analysis and, when applicable, by 1 H NMR spectroscopy. We have used NOESY experiments for structure elucidation of H 2 L and (NH 4 ) 2 [Pd 2 L 2 ]·2H 2 O in solution. Keywords Dinuclear complexes / d-block metals / Schiff bases / enolimines Introduction Our research efforts to synthesise dinuclear metal complexes of sulfonamide ligands with a potential interest in the catalysis field arises from the reported use of Zn 2 L 2 Et 2 (Fig. 1) as an efficient catalyst in the synthesis of poly(L-lactide)-Vitamin E TPGS nanoparticles (TPGS = tocopheryl polyethylene glicol succinate) [1]. One might note that the tridentate Schiff base ligand used to obtain Zn 2 L 2 Et 2 derives from the mono-condensation of a salicylaldehyde derivative and 2-tosylaminobenzylamine, which has been first synthetised by us [2].