Shuyun Niu

Syntheses, crystal structures and photophysical properties of Ag(I) coordination complexes.

Three Ag(I) coordination complexes, [Ag(pyzca)]n (1) (Hpyzca=pyrazine-2-carboxylic acid), Ag[(HNA)(NA)(H2O)4] (2) (HNA=nicotinic acid) and [Ag1Ag2-(2,3-pydc)]n (3) (H2pydc=pyridine-2, 3-dicarboxylic acid) have been synthesized by the hydrothermal method. Their structures are determined by single-crystal X-ray diffractometer. Complex 1 possesses the 3D infinite structure. Complex 2 is a mononuclear coordination complex and exhibits one 3D infinite network by a large number of hydrogen bonds. In complex 3, two crystallographic independent Ag(I) ions exist, i.e., Ag1 is three-coordinate and Ag2 is two-coordinate, forming the 2D layer structure. At room temperature in the solid state, the IR, FP and UV-Vis spectra of all complexes were measured and investigated in detail. The emission and absorption spectra of the three complexes and their corresponding ligands are compared and analyzed.

Synthesis and Luminescent Properties of Microsheets Europium Doped La(TTA)3Phen Coordination Polymer Prepared by Interfacial Self-Crystal Growth

A three-dimensional sheet-like micromaterial Eu0.15La0.85 (TTA)3phen has been synthesized by the oil-water interfacial self-crystal growth method at room temperature without the assistance of any surfactant, catalyst, or template. The resulting micromaterial consists of uniform microsheets with a length of 500–800 nm, width of 300–400 nm, and thickness of ∼80 nm. The appropriate overlap between absorption of ligand TTA and excitation of the microsheets indicated that TTA can efficiently transfer the absorbed energy to Eu3+. Furthermore, the maximum intensity peak was located at 613 nm, which shows the microsheets show pure red emission.

Spectroscopic properties of a series of Co(II) coordination polymers and the influence of Co(II) coordination environment on photoelectric property

Four Co(II) coordination polymers, [Co(suc)]n 1, [Co(pdc)]n 2, {[Co7(suc)4(OH)6(H2O)3]·8H2O}n 3, {[Co(bdc)(phen)(H2O)]·H2O}n 4 (H2suc=succinic acid, H2pdc=pyridine-3,4-dicarboxylic acid, H2bdc=1,2-benzenedicarboxylic acid, phen=1,10-phenanthroline) were hydrothermally synthesized and characterized by X-ray single-crystal diffraction, surface photovoltage spectroscopy (SPS), electrical conductivity, thermogravimetric analysis (TG), ultraviolet visible and near-infrared absorption spectrum (UV-Vis-NIR), infrared spectrum (IR), and elemental analysis. The structural analyses indicate that the coordination numbers of the Co(II) ions are 4, 5, 6 and 6 for the polymers 1-4, respectively. And polymers 1 and 2 exhibit 3D structure formed by suc(2-) and pdc(2-) anions bridging Co(II) ions, respectively. Polymer 3 exhibits a 2D structure with suc(2-) anions bridging seven-nuclear [Co7(OH)6(H2O)3](3-) unit and polymer 4 is a 1D structure bridged by bdc(2-) anions. The surface photoelectric properties of the cobalt polymers were mainly studied by SPS. The results of SPS reveal that all polymers possess certain photoelectric conversion property in the range of 300-800 nm. The influences of the structure, coordination micro-environment of central metal ion and structural dimensionality on response bands of SPS were discussed.

Synthesis and Crystal Structure of a New Co(II) Complex With Surface Photoelectric Property

A new cobalt(II) complex [Co(bidc)(H2O)2]n (H2bidc = Benzimidazole-5,6- dicarboxylic acid) has been synthesized by hydrothermal method and characterized by single-crystal X-ray diffraction, IR, UV-Vis, and surface photovoltage spectroscopy (SPS). Structural analysis indicated that the complex is a 1D chain structure and further connected to a 3D supramolecular architectures by hydrogen bonds. The SPS of the complex was analyzed emphatically. The result of SPS indicates that there are obvious response bands in the range of 300∼600 nm showing a certain level of photoelectric properties. There are good corresponded relationships between the SPS and UV-Vis spectra.