Out-of-plane dimeric MnIII quadridentate Schiff-base complexes: Synthesis, structure and magnetic properties

Four MnIII quadridentate Schiff-base compounds have been prepared and structurally characterized: [Mn(salpn)(CH3OH)2]BPh4 (1), [Mn2(salpn)2(N3)2] (2), [Mn2(salpn)2(NCS)2] (3), [Mn2(salpn)2(H2O)2](H2O)(ClO4)2 (4) (salpn = N,N′-(1,2-propylene)-bis-(salicylideneiminate)). Among them, 1 is a discrete MnIII monomeric complex with a square-bipyramidal geometry. Complexes 2, 3 and 4 form the similar phenolate-bridged out-of-plane dimers. Magnetic susceptibility studies reveal that 2, 3 and 4 all exhibit ferromagnetic intra-dimer coupling between MnIII ions.

Graphical abstractFour new MnIII quadridentate Schiff-base compounds have been reported. Except the monomeric structure of 1, 2, 3 and 4 all form out-of-plane dimeric structure and exhibit ferromagnetic intra-dimer coupling between MnIII ions. The electronic spectra and cyclic voltammogram behavior of the four complexes were also studied.Figure optionsDownload full-size imageDownload as PowerPoint slide