The heteronuclear metal oxide complexes are of great significance in heterogeneous catalytic oxidation of CO. However, previous studies are mainly focused on the composition of metal oxide, charge state, the support and the active oxygen species, with little attention paid to adsorbed CO ligands. Herein, the ligand-mediated reactivity in CO oxidation of niobium-nickel monoxide carbonyl complexes has been successfully identified. The NbNiO(CO) n- ( n = 5-6) anions are determined to be O-bridged complexes. In contrast, the NbNiO(CO) n- ( n = 7-8) anions are characterized to be η2-CO2-tagged complexes. The crucial roles of the multiply adsorbed CO molecules that can facilitate not only the competitive binding with bridging oxygen atom to the transition metal centers but also the electron accumulation of transition metal atoms have been discovered. The fascinating results are of substantial importance to understand the mechanisms of CO oxidation over heteronuclear metal oxide under CO-rich feed condition.

An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.

An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.

This paper reports the syntheses of two new complexes, [Co(L1)(H2O)2] (1) and [{Zn(L2)(μ-OAc)Zn(n-PrOH)}2] (2), from asymmetric halogen-substituted Salamo-type ligands H2L1 and H3L2, respectively. Investigation of the crystal structure of complex 1 reveals that the complex includes one Co(II) ion, one (L1)2− unit and two coordinated water molecules. Complex 1 shows slightly distorted octahedral coordination geometry, forming an infinite 2D supramolecular structure by intermolecular hydrogen bond and π–π stacking interactions. Complex 2 contains four Zn(II)ions, two completely deprotonated (L2)3− moieties, two coordinated μ-OAc− ions and n-propanol molecules. The Zn(II) ions in complex 2 display slightly distorted trigonal bipyramidal or square pyramidal geometries.

An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.

C19H15NO3, monoclinic, P2(1)/n, alpha = 9.1811(4)angstrom, b = 16.0396(6)angstrom, c = 10.1330(5)angstrom, beta = 98.640(5)degrees V = 1475.27(11)angstrom(3), Z = 4, R-gt(F) = 0.0539, w(Rref)(F-2) = 0.1373, T = 294.29(10) K.

A new Cu(II) complex with asymmetric Salamo-type ligand (H2L, 4-bromo-6'-ethoxy-2,2'-[ethylenedioxybis(nitrilomethylidyne)] diphenol) has been synthesized and characterized structurally. The X-ray crystal structure of the Cu(II) complex shows it to be a binuclear complex, in which each Cu(II) atom is in a distorted square-pyramidal geometry. The Cu(II) complex crystallizes in the monoclinic system, space group P2(1)/c, with unit cell parameters a = 14.7109(1), b = 8.6254(7), c = 30.124(3) angstrom, beta = 100.7400(1), and Z = 4. The Cu(II) complex consists of two Cu(II) atoms, and two L-2-units, and each Cu(II) complex molecule links four other molecules into an infinite 2D-layer supramolecular structure. Meanwhile, the Cu(II) complex exhibits emission with the maximum emission wavelength lambda(max) = 443 nm when excited at lambda(ex) = 340 nm.

A new Cu(II) complex with asymmetric Salamo-type ligand, 6-ethoxy-4',6'-dichloro-2,2'-[ethylenedioxybis(nitrilomethylidyne)]diphenol (H2L) has been synthesized and characterized by elemental analyses, FT-IR, UV-visible spectra and single crystal X-ray crystallography. The X-ray crystal structure of the Cu(II) complex reveals it to be a mononuclear structure, which contains one Cu(II) atom and one deprotonated L-2-unit. The center Cu(II) atom is tetra-coordinated, showing that the coordination sphere can be described as a square planar geometry distorted tetrahedrally by 33.07(4)degrees. In addition, the Cu(II) complex is linked to form an infinite 2D layer supramolecular structure through intermolecular C-H center dot center dot center dot O and C-H center dot center dot center dot Cl hydrogen bonds and pi-pi stacking interactions.

Three new Salamo-type bisoxime compounds H2L1-H2L3 have been synthesized from 2-hydroxy-4-methoxybenzaldehyde and 1,5-bis(aminooxy)pentane, 1,6-bis(aminooxy)hexane or 1,9-bis(aminooxy)nonane in hot ethanol medium, respectively and characterized by elemental analysis, IR and H-1 NMR spectroscopy.

A Ni(II) complex with 5-methoxy-4'-bromo-2,2'-[ethylenedioxybis(nitrilomethylidyne)] diphenol (H2L) has been synthesized, with the formula {[NiL(n-butanol)(mu-OAc)](2)Ni} u n-butanol. The crystal of the Ni(II) complex belongs to triclinic, space group P-1 with cell dimensions a = 10.897(1) angstrom, b = 12.439(1) angstrom, c = 12.518(1) angstrom and Z = 1. In the Ni(II) complex, there are three Ni(II) atoms, two deprotonated L-2-moieties which provide N2O2 donors, two acetate anions, two coordinated and one non-coordinated n-butanol molecules, which result in the formation of a slightly distorted octahedral coordination geometry around each Ni(II) atom, respectively.

A novel trinuclear Co(II) complex, fiCoL(PrOH)](2)Co(H2O)).-PrOH, has been synthesized with 6-ethoxy-6'-hydroxy-2,2'-[ethylenedioxybis(nitrilomethylidyne)]diphenol (H3L), and characterized by elemental analyses, FT-IR, UV-Vis, molar conductance and X-ray crystallographic analysis. Two n-propanol molecules and one water molecule coordinate to three Co(II) ions and four y-phenoxo oxygen atoms from two [CoL(CH3CH2CH2OH)] units also coordinating to Co(II) ion. All the penta-coordinated Co(II) ions of the Co(II) complex have a slightly distorted trigonal bipyramidal coordinated polyhedron. Meanwhile, the y-phenoxo bridges play important roles in assembling Co(II) ions and L3- units, which is different from the normal trinuclear Co(II) complexes with the Salamo-type ligands reported early. (C) 2014 Elsevier B.V. All rights reserved.

Five bisoxime chelating ligands L 1 -L 5 have been synthesized from 2-naphthaldehyde and 1,2-bis(aminooxy)ethane, 1,3-bis(aminooxy)propane, 1,4-bis(aminooxy)butane, 1,5-bis(aminooxy)pentane and 1,6-bis(aminooxy)hexane in hot ethanolic medium, respectively and characterized by elemental analyses, IR, UV-visible spectra and 1 H NMR spectroscopy.The bisoxime chelating ligands L 1 -L 5 may be promising units for the construction of supramolecular metal complexes.

A novel Co(II) dimer, [Co(HL)](2), has been synthesized by the reaction of H3L and Co(CH3COO)(2)center dot 4H(2)O in acetonitrile/methanol solution. X-Ray crystallographic analysis reveals that the Co(II) complex crystallizes in the triclinic system, space group P-1. The Co(II) atom is five-coordinated by four donor atoms of N2O2 coordination sphere and one O atom from other [Co(HL)] unit. Both of Co(II) atoms followed trigonal bipyramidal geometry. The complex molecule links with four other molecules into an infinite 2D-layer supramolecular structure on the bc crystallographic plane via intermolecular O-H-O, C-H-Br and C-H-O hydrogen-bonding interactions.

An asymmetrical Salamo-type compound 5-methoxy-4'-chloro-2,2'-[ethylenedioxybis(nitrilomethylidyne)]diphenol have been synthesized and characterized by single crystal X-ray crystallography. The crystal structure shows that the compound adopts an L-shaped configuration, in which the benzene rings are approximately perpendicular, making a dihedral angle of 84.09(3)degrees. And the molecule contains abundant intramolecular and intermolecular hydrogen bonding interactions. Thus, each molecule links six other molecules into an infinite 3D supramolecular structure by intermolecular hydrogen bonding interactions.

A novel Cu(II) dimer, [CuL](2), has been synthesized via the complexation of Cu(II) acetate monohydrate with 6-ethoxy-4',6'-dibromo2,2'-[ethylenedioxybis(nitrilo-methylidyne)] diphenol (H2L) in methanol/acetone mixed solution and characterized structurally by X-ray diffraction method. X-ray crystallographic analysis reveals that the Cu: L is 2: 2 in one dimer molecule and the coordination numbers of copper(II) atoms are four and five, resulting in slightly distorted square-planar and square-pyramidal geometries, respectively. With the help of intermolecular C1-H1A center dot center dot center dot O9, C19-H19B center dot center dot center dot O4, C20-H20B center dot center dot center dot O5 and C25-H25 center dot center dot center dot O6 hydrogen-bonding interactions, a self-assembled 2D-layer supramolecular structure is formed.

A series of bisoxime compounds have been synthesized by the reaction of 2,2'-(ethylenedioxy)bisbenzaldebyde with hydroxylamine hydrochloride, methoxyamine hydrochloride, ethyoxylamine hydrochloride or 3-aminoacetophenone oxime,in hot ethanol medium, respectively and characterized by elemental analyses, IR, UV-visible spectra and H-1 NMR spectroscopy.

Two copper(I) complexes, [Cu(L)] ClO4 (1) and [Cu(L) Cl]center dot C2H5OH (2), have been synthesized by the reaction of copper(II) perchlorate hexahydrate and copper(II) chloride dihydrate with N, N'-(1,2-dimethylene) bisbenzoylthiourea (L), respectively and characterized by elemental analyses as well as IR spectra and TG-DTA analyses. Antibacterial activity assays exhibit MIC50 values of the two copper(I) complexes comparable to standard drugs for both Gram-positive and Gram-negative bacteria, both of them show stronger antibacterial activity.

An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.

A new Cu(II) complex has been synthesized by the reaction of a new Salamo-type ligand of 2,2'-[ ethylenedioxybis(nitrilomethylidyne)]dinaphthanol (H2L) with Cu(II) acetate monohydrate in acetone/methanol solution and characterized by X-ray diffraction methods. The X-ray crystallography of the Cu(II) complex shows it to be a mononuclear complex, in which the Cu(II) atom is in a distorted square-planar geometry and the center Cu(II) atom is tetra-coordinated lying in the N2O2 coordination sphere. The Cu(II) complex crystallizes in the triclinic system, space group P-1. The unit cell contains two crystallographically independent but chemically identical mononuclear Cu(II) complex (molecules A and B). And every complex molecule links four other molecules into an infinite 2D-layer supramolecular structure.