Synthesis, crystal structure and magnetic properties of two new manganese Schiff base complexes [Mn2(L1)2(NCS)2] and [Mn(L2)(N3)(H2O)] [{L1H = C13H10N2O2}; {L2H2 = C19H22N2O4}]

A μ2-dicarboxylato bridged dinuclear manganese(II) Schiff base complex [Mn2(L1)2(NCS)2] (1), {L1=C13H9N2O2-} and a mononuclear manganese(III) Schiff base complex [Mn(L2)(N3)(H2O)] (2), {L2=C19H20N2O4-2} have been synthesised and characterised by elemental analysis, IR and UV–Vis spectra (only complex 2). Structures of both the complexes are established by single crystal X-ray analysis. A variable temperature magnetic susceptibility measurement study has been performed for complex 1 and the result indicates there is a very weak antiferromagnetic interaction (J = −0.41 ± 0.02 cm−1) between the two manganese(II) centres. Complex 2 forms a dimer through strong hydrogen bonding and the room temperature magnetic moment value shows there is no significant interaction between the low spin manganese(III) centres connected through hydrogen bonds.

Graphical abstractA μ2-dicarboxylato bridged dinuclear manganese(II) Schiff base complex [Mn2(L1)2(NCS)2] (1), {L1=C13H9N2O2-} and a mononuclear manganese(III) Schiff base complex [Mn(L2)(N3)(H2O)] (2), {L2=C19H22N2O4-2} have been synthesised and characterised by elemental analysis, IR and UV–Vis spectra. Structures of both complexes have been established by single crystal X-ray analysis. Complex 1 shows a very weak antiferromagnetic interaction. Complex 2 forms a dimer through a H-bonding interaction.Figure optionsDownload full-size imageDownload as PowerPoint slide