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.

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=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 as PowerPoint slide