A novel 1-D Cd( coordination polymer, [Cd( p-BDOA)·2H2O]n (I) ( p-BDOA2-=benzene-1,4-dioxyacetate dianion) has been synthesized and characterized by elemental analysis, IR, PL, TG and X-ray single crystal diffraction. The Crystal crystallizes in monoclinic system, the space group is C2/c, with the crystal cell parameters a=1.175 1(1) nm, b=0.551 0(1) nm, c=1.827 7(2) nm, β=96.14(2)°, and V=1.176 6(3) nm3,, Mr=372.60, R=0.045 9, wR=0.127 9. The Cd( ion has a trigonal prism coordination configuration that defined by four carboxyl O atoms from two different p-BDOA2- ligands and two water molecules. Adjacent Cd( ions are linked by carboxylate groups with the bidentate coordination mode, giving rise to a chain structure with the adjacent Cd...Cd distance of 1.526 3(5) nm. Furthermore, such chains are linked by hydrogen bonds to form supramolecular network. The results of PL and TG show that the complex exhibits intense fluorescent emissions and its chain skeleton is thermally stable up to 419 K. CCDC: 220443.
The silicate oxyapatites Ca2-3xLa8+2x□x（SiO4）6O2 （x=0, 0.17, 0.33, 0.50, 0.67） was synthesized via a sol-gel method at low temperature. The apatite phases have been characterised by X-ray diffraction （XRD）, conducting properties was studied by electrical chemistry impedance spectroscopy （EIS）. The conductivity of La9.33□0.67（SiO4）6O2 is 1.58 × 10-3 S·cm-1 at 700 ℃, it is higher about 4 270 times than that of Ca2La8（SiO4）6O2, the activation energy is decreasing from 1.37 eV to 0.84 eV. With cation vacancies increasing,the conducting mechanism is gradually translation from a direct linear pathway free oxygen ion conduction to a curve pathway interstitial oxygen ion conduction. The electrical conductivities is almost independent of the oxygen partial pressure, this suggests that the oxyapatites exhibited almost pure O2- ion conduction over a wide range of oxygen partial pressure.
