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Coleman, F., Dux, D., Erxleben, A
2013
July
Zeitschrift Fur Anorganische Und Allgemeine Chemie
Solvent-dependent switch of magnesium ions between different binding sites in a compartmental Schiff base ligand
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Schiff bases Magnesium X-ray diffraction C-13 CHEMICAL-SHIFTS METAL-COMPLEXES IRON(III) COMPLEXES PROTON-TRANSFER NMR SALEN EQUILIBRIUM EPOXIDATION PRECURSORS DINUCLEAR
639
1584
1589
The coordination behavior of two Schiff base ligands, N,N'-bis(3-carboxysalicylidene)ethylenediamine (H2L1) and N,N'-bis(3-carboxysalicylidene) propylenediamine (H2L2), towards magnesium ions is reported. The ligands show different binding site selectivity for Mg2+ depending on the solvent. In complexes isolated from aqueous or methanolic solutions the metal ion resides in the outer O2O2 compartment. The X-ray analysis of the complex of H2L1 showed the complex to be dimeric with magnesium being coordinated by two phenolate and two carboxylate oxygens, a bridging phenolate oxygen, and a water ligand. In aprotic solvents like dimethylsulfoxide (DMSO) and dimethylformamide (DMF) magnesium migrates to the inner N2O2 binding site. In DMSO solution containing small amounts of water, both isomers co-exist. A similar solvent-dependent site selectivity is not observed for zinc ions.
DOI 10.1002/zaac.201300062
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