Ya-Ping Xu

Synthesis, structure, photoluminescence and theoretical study of (MQ)(CdBr4) with MQ2+ generated In Situ (MQ2+ = N-Me-4,4′-bipyridinium)

A new compound (MQ)(CdBr4) (1; MQ2+ = N-Me-4,4′-bipyridinium), in which the MQ2+ was generated in situ, has been synthesized via hydrothermal reaction. The title compound features an isolated structure, based on discrete MQ2+ moieties and tetrahedral cadmium atoms terminally coordinated by four bromine atoms. The MQ2+ moieties and tetrabromo-cadmium dianions are linked via hydrogen bonds. Photoluminescent investigation reveals that the title compound displays a strong blue-light emission, which is attributed to a ligand-to-ligand charge-transfer (LLCT; from the HOMO of the bromine atoms to the LUMO+1 of the MQ2+ moieties) mechanism probed by molecular orbital (MO) calculations.

Synthesis and structure of [Nd(C6NO2H5)3(H2O)2]2n· (3nHgCl4) · (4nH2O)

Abstract Hydrothermal reaction of NdCl3 · 6 H2O, HgCl2 and isonicotinic acid gave a bimetallic 4f-5d metal-isonicotinato complex [Nd(C6NO2H5)3(H2O)2]2n · (3nHgCl4) · (4nH2O) (1) and an X-ray crystal structure analysis reveals that it features a one-dimensional polycationic chain-like structure. The crystal belongs to the monoclinic, space group C2/c with a = 24.208(1), b = 20.842(1), c = 15.379(1) Å, β = 127.759(1)°, V = 6134.5(7) Å3, Z = 4, C36H46Cl12Hg3N6Nd2O20, Mr = 2198.44, Dc = 2.380 g/cm3, S = 0.986, μ(MoKα) = 9.738 mm–1, F(000) = 4112, R = 0.0384 and wR = 0.0848. The neodymium atom has a distorted square anti-prism geometry, coordinated by eight oxygen atoms. Each mercury atom is bound by four chlorine atoms to form a HgCl42– tetrahedron. The [Nd(C6NO2H5)3(H2O)2]2n6n+ species, HgCl42– anions and lattice water molecules are held together via hydrogen bonds to form a three-dimensional framework.

Syntheses, structures and photoluminescence of a series of transition metal-cyanopyridine polymers

A series of transition metal-n cyanopyridines (i.e. pyridine-n-carbonitrile; n = 2, 3, 4) complexes with one-dimensional (1-D) structures, [CuCl2(pyridine-3-carbonitrile)2] n , [CuCl2(pyridine-4-carbonitrile)2] n and [CoCl2(pyridine-4-carbonitrile)2] n , have been synthesised via hydrothermal reactions and structurally characterised by single-crystal X-ray diffraction. All these complexes feature infinite 1-D chain-like structures. Photoluminescent investigation reveals that the title complexes display strong emissions which may originate from π→π* charge-transfer interaction of the ligands.

Solvothermal Preparation, Crystal Structure, and Photoluminescence of a Cadmium Compound With a Two-Dimensional Supramolecular Layer

By virtue of a solvothermal reaction, a new cadmium-bipyridinium derivative (N,N′-dimethyl-4,4′-bipyridinium)3(CdCl3-HCl-CdCl3)(CdBr4)2 (1) with the N,N′-dimethyl-4,4′-bipyridinium cation obtained in situ, was synthesized and characterized by X-ray single-crystal diffraction method. The title compound is characteristic of an isolated structure. The anions and cations in 1 are connected through hydrogen-bonding interactions to give a two-dimensional (2-D) supramolecular layer. The fluorescence result discovers a wide emission band in the green region.

Photophysical and electrochemical properties of a dysprosium‐zinc tetra(4‐sulfonatophenyl)porphyrin complex

A dysprosium-zinc porphyrin, [DyZn(TPPS)H3O]n (1) (TPPS = tetra(4-sulfonatophenyl)porphyrin), was prepared through solvothermal reactions and structurally characterized by single-crystal X-ray diffraction analyses. Complex 1 features a three-dimensional (3-D) porous open framework that is thermally stable up to 400 °C. Complex 1 displays a void space of 215 Å(3), occupying 9.2% of the unit cell volume. The fluorescence spectra reveal that it shows an emission band in the red region. The fluorescence lifetime is 39 µsec and the quantum yield is 1.7%. The cyclic voltammetry (CV) measurement revealed one quasi-reversible wave with E1/2  = 0.30 V.

A novel terbium-cobalt tetra(4-sulfonatophenyl)porphyrin: Synthesis, structure and photophysical and electrochemical properties

A novel terbium-cobalt porphyrin {[Tb(H2O)3][Co(TPPS)]}n•nH3O (1) (TPPS = tetra(4-sulfonatophenyl)porphyrin) has been synthesized via a hydrothermal reaction and structurally characterized by X-ray single crystal diffraction. Compound 1 is characterized by a three-dimensional (3-D) porous open framework, which is originated from the Co(TPPS) moieties interconnected by the terbium ions. The fluorescence study shows that compound 1 displays an emission band in the blue region. Nanosecond transient spectra reveals that the fluorescence lifetime is 1.14 ms. The cyclic voltammetry (CV) and differential pulse voltammetry (DPV) experiments discovers one reversible wave with E1/2 = -0.80 V.

Photophysical and electrochemical properties of a novel 4f–3d heterometallic porphyrin

A 4f-3d heterometallic porphyrin, [TbCo(TPPS)H3O]n (1) (H2TPPS = tetra(4-sulfonatophenyl)porphyrin), has been synthesized via a hydrothermal reaction and structurally characterized by single crystal X-ray diffraction analysis. The structure of 1 consists of [TbCo(TPPS)H3O]n molecules. The Tb3+ ions are coordinated by eight oxygen atoms from eight sulfonic groups, yielding a distorted square anti-prism geometry. Compound 1 is characterized by a three-dimensional (3-D) porous open framework that is thermally stable up to 350°C. Compound 1 displays a fluorescent emission band in the ultraviolet region and its fluorescence lifetime is 1.14 ms. A slow scan CV curve of compound 1 reveals one reversible wave with E1/2 being equal to -0.78 V, which is close to the value -0.74 V of DPV diagram.

Retraction of articles by H. Zhong et al.

Retraction of 41 articles by H. Zhong et al..

Synthesis and Crystal Structure of (Nd(C6NO2H5)3(H2O)2)nn(ZnCl4)·nCl·2.5nH2O with Novel Poly-Cationic Chain

The title complex, [Nd(C6NO2H5)3(H2O)2]nn[ZnCl4]·nCl·2.5nH2O (1), was obtained by hydrothermal reactions and structurally characterized by X-ray diffraction. The crystal structure analysis reveals that the title complex is characteristic of a novel polycationic [Nd(C6NO2H5)3(H2O)2]n3n+ one-dimensional chain-like structure.

Bis(4H-1,2,4-triazol-3-yl)disulfane

The title compound, C4H4N6S2, was synthesized by the reaction of 3-mercapto-1H-1,2,4-triazole with sodium hydroxide in ethanol. The molecule possesses a crystallographically imposed twofold axis. Intermolecular N—H⋯N hydrogen bonds link the molecules into chains along the c axis.