Changyan Sun

Synthesis and optical properties of zinc phosphate microspheres

Monodisperse zinc phosphate microspheres were synthesized by a facile solvothermal method in the presence of oleic acid. X-ray powder diffraction (XRD), Fourier transform infrared spectrum (FT-IR), emission scanning electron microscopy (SEM), and energy dispersive X-ray spectrum (EDX) were used to characterize the microstructures and morphologies of the as-obtained zinc phosphate samples. The experimental results indicate that the zinc phosphate products are well crystallized, and the morphologies of the samples can be easily controlled by the elaborate choice of oleic acid addition and the content of NaOH. Furthermore, self-activated luminescent properties of the products are observed. The as-obtained samples show an intense blue emission under a long-wavelength UV light excitation of 400 nm. The possible luminescent mechanism may be ascribed to the carbon-related surface impurities or defects.

3,3'-[Biphenyl-4,4'-diylbis(-oxy)]diphthalic acid.

In the title molecule, C28H18O10, the two central benzene rings form a dihedral angle of 31.0 (1)°. In the phthalic acid fragments, the carboxy groups in the meta positions are approximately coplanar with the attached benzene rings, being inclined to their planes at 2.7 (1) and 10.3 (1)°, while the carboxy groups in the ortho positions are twisted from the benzene ring planes by 83.5 (1) and 75.4 (1)°. In the crystal, O—H⋯O hydrogen bonds link the molecules into layers parallel to the bc plane. Weak C—H⋯O hydrogen bonds and π–π interactions between the aromatic rings [centroid–centroid distance = 3.7674 (3) Å] further consolidate the crystal packing.

catena-Poly[[diaqua­bis­[2-(3-oxo-1,3-di­hydro-2-benzofuran-1-yl)acetato-κO]cobalt(II)]-μ-1,2-bis­(pyridin-4-yl)ethane-κ2N:N′]

In the title complex, [Co(C10H7O4)2(C12H12N2)(H2O)2]n, the CoII ion is located on a crystallographic centre of symmetry and is six-coordinated by two N atoms from two 1,2-bis(4-pyridyl)ethane ligands, two carboxylate O atoms from two 1,3-dihydro-3-oxo-1-isobenzofuranacetate ligands and two terminal water ligands. The 1,2-bis(4-pyridyl)ethane ligands act as bidentate ligands, and bridge the CoII ions into infinite chains extending parallel to [010]. In these chains, there are intra-molecular O—H⋯O hydrogen bonding between the coordination water molecules and carboxylate groups. Inter-molecular O—H⋯O hydrogen bonding between the adjacent chains and π⋯π stacking interactions result in the formation of a three-dimensional supramolecular network.