Synthesis and polymer structure of [Zn(4,4′-bipy){(i-PrO)2PS2}2]n and thermal properties of ZnL{(i-PrO)2PS2}2 (L = phen, 2,2′-bipy, 4,4′-bipy)

A new mixed-ligand complex, Zn(4,4′-bipy){(i-PrO)₂PS₂}₂, was synthesized. Single crystals were grown,and the structure of the complex was determined by X-ray diffraction (CAD-4 diffractometer, MoK_α radiation, 14807 F_hkl, R =0.0391. The crystals are monoclinic with unit cell dimensions a-17.569(2), b = 26.253(5), c = 27.915(3) Å, ß =100.70(1)°, V = 12652(3) ų, Z = 16, d_valc = 1.361 g/cm³, space group P2₁/n. The structure is formed from infinite zigzag polymer chains stretched along the a axis. The coordination polyhedron of the Zn atom is a distorted tetrahedron formed by two S atoms of two monodentate diisopropyldithiophosphate ligands and two N atoms of two bridging bidentate 4,4′-bipy molecules. When heated in vacuum, the compounds ZnL{(i-PrO)₂PS₂}₂ (L) =phen, 2,2′-bipy, 4,4′-bipy are volatile.     

Mixed-Ligand Coordination Compounds CdL{(i-C4H9)2PS2}2(L = Phen, 2,2"-Bipy,and 4,4"-Bipy): Synthesis,Structure, and Thermal Properties. Polymeric Structure of [Cd(4,4"-Bipy){(i-C4H9)2PS2}2]n

Volatile mixed-ligand compounds of Cd(i-Bu₂PS₂)₂with Phen, 2,2"-Bipy, and 4,4"-Bipy were synthesized. Their single crystals were grown. X-ray diffraction data (a CAD4 diffractometer, MoK radiation, 2140 F _hkl, R=0.0251) were used to determine the structure of [Cd(4,4"-Bipy)(i-Bu₂PS₂)₂]. The crystals are mono-clinic: a= 14.678(3) Å, b= 11.866(2) Å, c= 19.655(4) Å, = 102.17(3)°, V= 3346(1) ų, Z= 4, _calcd= 1.364 g/cm³, space group C2/c. The structure is built from linear polymeric chains arranged along the [010] direction. The coordination polyhedron of the Cd atom is a distorted octahedron (4S + 2N). The thermal properties of these compounds, studied both in air and in vacuo, allow one to use them for preparing CdS films by chemical precipitation from the gas phase.     

High efficiency ZnO nano sensor,fabrication and characterization

Ultra fine thin films of pure and SnO doped ZnO nanosensor were grown on gold digitated ceramic substrate from bis(2, 4- pentanedionate)dimethylethanolamine zinc (II) using bis(2, 4-pentanedionate) tin(II) chloride as a dopant by ultrasonic aerosol assisted chemical vapor deposition technique (UAACVD) at temperature range of 400–450 °C under oxygen atmosphere at 5 Pa pressure. The sensitivity, selectivity, fast recovery, and reliability test performed on nanosensor suggested that both doped and undoped ZnO thin films are suitable for detecting ethanol vapor in the temperature range of at 60 to 150 °C, whereas at room temperature (25 °C) response and recovery time of the sensor increases many folds compared to 60 °C. Sensitivity of the ZnO sensor shows linear relationship with the increase of gas concentration. Electrical properties show that 1 % SnO doped ZnO enhanced the sensitivity of the film drastically and thus improved its detecting efficiency. Physico-chemical techniques like, CHNS-O, atomic absorption analyzer, and infra red and multinuclear nuclear magnetic resonance spectrometers were used for precursor characterization. X-ray diffractometer, scanning electron microscope, sigma scan analyzer and energy dispersive x-ray techniques were used for thin film characterization.