Cyano‐Bridged ‘Oximato’ Complexes: Synthesis, Structure, and Catalase‐Like Activities

摘要: The reaction of the ‘oximato’-ligand precursor A (Fig. 1) and metal salts with KCN gave two mononuclear complexes [ML(CN)(H2O)n](ClO4) (1 2; L={N-(hydroxy-κO)-α-oxo-N′-[(pyridin-2-yl-κN)methyl[1,1′-biphenyl]-4-ethanimidamidato-κN′}; M=CoII (1), CuII (2); n=2 for CoII, n=0 CuII; Figs. 2 3). new cyano-bridged pentanuclear ‘oximato’ [{ML(H2O)n(NC)}4M1(H2O)x](ClO4)2 (3–6) trinuclear [{ML(H2O)n(NC)}2M1L](ClO4) (7–10) ([M1=MnII, x=2 MnII, x=0 CuII] were synthesized from characterized by elemental analyses, magnetic susceptibility, molar conductance, IR thermal analysis. four [ML(CN)(H2O)n]+ moieties are connected a metal(II) ion in complexe 3–6, each one involving cyano bridging ligands (Fig. 4). central displays square-planar or octahedral geometry, forming equatorial plane. axial positions occupied aqua case Mn-atom. an ligand 7–10, (Fig. 5). ions display distorted square-pyramidal donor atoms tridentate ligand. Moreover catalytic activities disproportionation hydrogen peroxide (H2O2) also investigated presence 1H-imidazole. homopolynuclear 6 10 displayed eficiency disproportion reactions H2O2 producing H2O dioxygen thus showing catalase-like activity.