[M(Hdapsc)]-[Cr(CN)] (M = Mn, Co) Chain and Trimer Complexes: Synthesis, Crystal Structure, Non-Covalent Interactions and Magnetic Properties.

Four new heterometallic complexes combining [M(Hdapsc)] cations with the chelating Hdapsc {2,6-diacetylpyridine-bis(semicarbazone)} Schiff base ligand and [Cr(CN)] anion were synthesized: {[M(Hdapsc)]Cr(CN)K(HO)(EtOH)}·1.2(HO), M = Mn () and Co (), {[Mn(Hdapsc)]Cr(CN)(HO)}Cl·HO () and {[Co(Hdapsc)]Cr(CN)(HO)}Cl·2EtOH·3HO (). In all the compounds, M(II) centers are seven-coordinated by NO atoms of Hdapsc in the equatorial plane and N or O atoms of two apical -CN/water ligands. Crystals and are isostructural and contain infinite negatively charged chains of alternating [M(Hdapsc)] and [Cr(CN)] units linked by CN-bridges. Compounds and consist of centrosymmetric positively charged trimers in which two [M(Hdapsc)] cations are bound through one [Cr(CN)] anion. All structures are regulated by π-stacking of coplanar Hdapsc moieties as well as by an extensive net of hydrogen bonding. Adjacent chains in and interact also by coordination bonds via a pair of K ions. The compounds containing Mn (, ) and Co (, ) show a significant difference in magnetic properties. The ac magnetic measurements revealed that complexes and behave as a spin glass and a field-induced single-molecule magnet, respectively, while and do not exhibit slow magnetic relaxation in zero and non-zero dc fields. The relationship between magnetic properties and non-covalent interactions in the structures - was traced.