μ-Phenolato-μ-acetato-bridged Dinuclear Copper(II) Complex with Dinucleating Schiff-base Ligand Having Three Phenolate Groups

Magnetostructural Properties of Some Doubly-Bridged Phenoxido Copper(II) Complexes

“…Dinuclear copper(II) complexes in which the Cu(II) ions are bridged by a phenolate oxygen atoms (L-O) and an exogenous bridging atom X with the coordination core Cu(µ-L-O)(µ-X) Cu (X = L-O, OH − , OR − , O 2− , OAc − , N 3 − and Cl − ) have been reported for a number of ligands with different skeletons frames [ 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 ]. Some of these complexes have served as cooperative model systems to mimic the active sites in metalloproteins, such as hemocyanin [ 12 , 13 , 14 , 15 , 16 ], metalloenzymes, such as tyrosinase [ 16 , 17 , 18 ], galactose oxidase (GOase) [ 19 , 20 , 21 , 22 , 23 , 24 ], superoxide dismutase (SOD) [ 25 , 26 , 27 ], and as artificial nucleases for promoting the cleavage of DNA [ 5 , 6 , 28 , 29 ] as well as anticancer agents [ 30 , 31 ].…”

“…Different strategies have been employed in the design of this class of compounds. The first approach was achieved though the interaction Cu(II) salts with tridentate ligand-based phenolates in their skeletons [ 34 , 35 , 36 , 37 , 38 , 39 , 40 , 41 ], and the second approach was via the design of bicompartmental phenolates bearing two pendent arms of N-donor groups [ 1 , 2 , 3 , 4 , 5 , 6 , 42 , 43 ]. A third approach was also used through the design of tripodal pyridyl tetradentate ligands containing one or two phenolate arms [ 12 , 14 , 15 , 20 , 29 , 44 , 45 , 46 , 47 , 48 , 49 , 50 , 51 ].…”

Crystal Structure of a μ-Phenolato-μ-oxido-bridged Dinuclear Manganese(III) Complex with Dinucleating Schiff-base Ligand Having Three Phenolate Groups

“…[1][2][3][4][5][6][7] Previously, we reported unique dinuclear copper(II) complexes with a Schiffbase ligand having three phenolate donor atoms: 2-(5-chloro-2hydroxyphenyl)-1,3-bis(2-(5-chloro-2-hydroxybenzylideneamino)ethyl)imidazolidine (H3LCl), [Cu2(μ-LCl)(μ-CH3CO2)]•CH3CN• H2O and [Cu2(μ-LCl)(μ-C6H5CO2)]•H2O, where each copper atom is coordinated by phenolato-oxygen, imino-and imidazolidine-nitrogen atoms of LCl 3in a meridional fashion and the two copper atoms are bridged by the third phenolatooxygen of LCl 3and a μ-carboxylato group to form a squarepyramidal geometry. 8,9 As far as we know, there are no reports on a manganese complex with this type of Schiff-base ligands having three phenolate donor atoms. In this study, we isolated a new manganese complex by using an analogous Schiff-base ligand, 2-(5-nitro-2-hydroxyphenyl)-1,3-bis(2-(5-nitro-2-hydroxybenzylideneamino)ethyl)imidazolidine (H3LNO2), as single crystals, and determined the crystal structure, which shows a μ-phenolato-μ-oxido-bridged dinuclear manganese(III) complex with a distorted octahedral geometry, as shown in Fig.…”

“…2. In the dinuclear molecule, the two manganese atoms (Mn1 and Mn1′) are bridged by a phenolato-oxygen atom (O6) of LNO2 8,9 The elongated Mn1-N3 distance corresponds to the elongated Cu-N (imidazolidine) distances in the dinuclear copper(II) complexes, 8,9 and thus, the elongation may be due to the steric constraint imposed by the Schiff-base ligand. The elongation in the Mn1-O6 and Mn1-Cl1 bonds may reflect the pseudo Jahn-Teller distortion of the high-spin Mn(III) state.…”

“…The coordination mode is similar to the dinuclear copper(II) complexes with the analogous Schiff-base ligand; however, the oxidation state and the coordination geometry are different from the copper(II) cases. 8,9…”