Mei-Qin Zha

Synthesis, photoluminescence, catalysis and multilayer film assembly of an ethynylpyridine platinum compound

An alkynyl platinum(II) compound of [Pt(CCPy)2(dppe)] (1) was prepared by reaction of [PtCl2(dppe)] and 4-ethynylpyridine hydrochloride in the presence of base and CuI (dppe = 1,2-bis(diphenylphosphino)ethane). Single crystal X-ray diffraction analysis reveals that compound 1 crystallizes in a monoclinic system and Cc space group with a = 17.8507(7), b = 21.4219(7), c = 9.0526(5) A, β = 108.98(2)°. Thermogravimetric analysis (TGA), powder X-ray diffraction (PXRD), UV-vis spectra, photoluminescence, and catalysis properties of 1 are discussed. The multilayer films formed with ruthenium trichloride by a layer-by-layer self-assembly method were characterized by UV-vis spectra, atomic force microscopy (AFM) images and cyclic voltammograms (CV).

catena-Poly[cadmium-bis-(μ-N,N-dimethyl-dithio-carbamato-κS,S':S)].

In the title compound, [Cd(C3H6NS2)2]n, the CdII atom, lying on a twofold rotation axis, is coordinated by six S atoms from four different N,N-dimethyldithiocarbamate ligands in a distorted octahedral geometry. The bridging of S atoms of the ligands leads to the formation of a one-dimensional structure along [001].

Self-assembly of metal–organic frameworks: From packing helical channels to 2-fold interpenetration helical layers

Two new 2D metal–organic frameworks were assembled in different conditions. Single X-ray diffraction analyses reveal that complex 1 possesses packing of large helical channels filled by guest water molecules; and 2 has a 2-fold interpenetration layer-like structure with relatively petite helical channels, with guest water molecules residing in the void spaces between neighboring helical layers. The diverse structures may result from dissimilar crystal growth mechanisms with distinct thermal stable energies confirmed by theoretical calculation. Photoluminescent spectra, thermogravimetric analyses and power X-ray diffraction analyses were performed.

Bis(μ-2-phenyl-quinoline-4-carboxyl-ato)bis-[aqua-(1,10-phenanthroline)(2-phenyl-quinoline-4-carboxyl-ato)manganese(II)] dihydrate.

In the centrosymmetric dinuclear title complex, [Mn2(C16H10NO2)4(C12H8N2)2(H2O)2]·2H2O, the MnII cation is in a distorted octahedral coordination geometry defined by two N atoms from a 1,10-phenanthroline ligand, one water O atom and three O atoms from three 2-phenylquinoline-4-carboxylate anions. A pair of 2-phenylquinoline-4-carboxylate anions bridge two Mn cations, forming the dinuclear molecule. An intramoleculr O—H⋯O hydrogen bond occurs. Intermolecular O—H⋯O and O—H⋯N hydrogen bonds are present in the crystal structure.

Syntheses, structures, and fluorescence of two cadmium compounds [Cd2(pqc)4(phen)2(H2O)2] · 2H2O and {[Cd(pqc)2(bpy)(H2O)2] · 2H2O} n

Assembly of 2-phenylquinoline-4-carboxylic acid and Cd(CH3COO)2 · 2H2O or CdSO4 · 8H2O gave two new complexes [Cd2(pqc)4(phen)2(H2O)2] · 2H2O (1) and {[Cd(pqc)2(bpy)(H2O)2] · 2H2O} n (2) (pqcH = 2-phenylquinoline-4-carboxylic acid, phen = 1,10-phenanthroline, bpy = 4,4′-bpy). Complexes 1 and 2 have been characterized by single-crystal X-ray diffraction, IR, powder X-ray diffraction, thermogravimetric analyses, and fluorescence spectra. Structural analyses reveal that 1 is binuclear; the binuclear Cd(II) units are linked by intermolecular hydrogen bonds and π–π interactions to generate a supramolecular structure. Complex 2 possesses a 1-D infinite chain with chains further assembled into a 3-D supramolecular network by π–π, H-bonding, and C–H ··· π interactions.

Synthesis, Photoluminescent, and Magnetic Properties of Two Lanthanide Sulfosalicylate Complexes

Self-assembly reactions of 5-sulfosalicylic acid (ssa) and lanthanide oxides under hydrothermal condition gave rise to two hybrid polymeric complexes, namely [Nd(ssa)(H2O)]n (1) and {[Tb(ssa)(H2O)2]·H2O}n (2). X-ray diffraction analyses reveal that complex 1 holds a three-dimensional framework and complex 2 possesses a two-dimensional network with the asymmetric unit comprising one Tb(III) ion, one sulfosalicylate ligand, and two coordinated and one free water molecule. The Fourier transform infrared spectra, thermogravimetric analyses, magnetic susceptibility, and fluorescent measurements for the complexes have been performed. Supplemental materials are available for this article. Go to the publishers online edition of Synthesis and Reactivity in Inorganic, Metal-Organic, and Nano-Metal Chemistry to view the supplemental file.

Synthesis, Crystal Structure and Magnetic Properties of a Mn(II) Fluorenedicarboxylate Complex

A new Mn(II) metal-organic framework, [Mn(DFDC)(phen)]n (1) (where H2DFDC=9,9- diethylfluorene-2,7-dicarboxylic acid, phen=1,10-phenanthroline), was solvothermally synthesized and characterized by single-crystal and powder X-ray diffraction (PXRD), elemental and thermal analysis, IR, UV=Vis spectroscopy, fluorescence and magnetic measurements. Single-crystal X-ray analysis reveals that 1 exhibits a three-dimensional coordination polymer structure. The compound crystallizes in the orthorhombic space group Pnna with a=9.1215(9), b=26.436(3), c=10.2428(10) Å, V =2469.9(4) Å3, Z =4, final wR2=0.1323 for 2825 reflections. The Mn(II) ion is coordinated by four oxygen atoms from four different H2DFDC ligands and two nitrogen atoms from one phen ligand in an octahedral coordination geometry. The compound shows ferromagnetic coupling behavior and has high thermal stability up to 420 °C Graphical Abstract Synthesis, Crystal Structure and Magnetic Properties of a Mn(II) Fluorenedicarboxylate Complex

Bis(1,10-phenanthroline-κ2N,N′)[2-(4-sulfonato­anilino)acetato-κO]copper(II) dihydrate

In the title compound, [Cu(C8H7NO5S)(C12H8N2)2]·2H2O, the CuII ion is coordinated by four N atoms from two 1,10-phenanthroline (phen) ligands and one O atom from a 2-(4-sulfonatoanilino)acetate (spia) ligand in a distorted square-pyramidal geometry. Intermolecular N—H⋯O and O—H⋯O hydrogen bonds, as well as π–π interactions between phen ligands and between phen and spia ligands [centroid–centroid distances = 3.663 (3), 3.768 (3) and 3.565 (3) Å], result in a three-dimensional supramolecular structure.

(μ-4,4′-Bipyridine-κ2 N:N′)bis­[bis­(N,N-dimethyl­dithio­carbamato-κ2 S,S′)zinc(II)]

The title dinuclear ZnII complex, [Zn2(C3H6NS2)4(C10H8N2)], is centrosymmetric; the mid-point of the C—C bond linking the two pyridine rings is located on an inversion center. The pyridine N atom coordinates to the ZnII cation, which is also chelated by two dimethyldithiocarbamate anions, giving a trigonal-bipyramidal ZnNS4 geometry. Weak intermolecular C—H⋯S hydrogen bonding is present in the crystal structure.

(μ-4,4′-Bipyridine-κ2N:N′)bis[bis(N,N-dimethyldithiocarbamato-κ2S,S′)zinc(II)]

The title dinuclear ZnII complex, [Zn2(C3H6NS2)4(C10H8N2)], is centrosymmetric; the mid-point of the C—C bond linking the two pyridine rings is located on an inversion center. The pyridine N atom coordinates to the ZnII cation, which is also chelated by two dimethyldithiocarbamate anions, giving a trigonal-bipyramidal ZnNS4 geometry. Weak intermolecular C—H⋯S hydrogen bonding is present in the crystal structure.