23713-49-7Relevant academic research and scientific papers
Mechanism of the Current Doubling Effect. I. The ZnO Photoanode in Aqueous Solution of Sodium Formate
Fujishima, Akira,Kato, Tamihiko,Maekawa, Etsuro,Honda, Kenichi
, p. 1671 - 1674 (1981)
Current doubling mechanism of the photoanodic reaction of sodium formate at the ZnO electrode is re-examined.Quantitative analysis of the reaction products revealed that ZnO electrode corroded during the current doubling reaction, which has not been previously reported.However, zinc ions were formed with about 50percent of current efficiency.Carbon dioxide, instead of oxygen, was formed during the reaction.These experimental observations strongly suggested mechanism proposed by earlier workers were incorrect.A new mechanism is proposed.
Spiropyrans and spirooxazines: 11. Complexation of photochromic 5-(1,3-benzothiazol-2-yl)-substituted 1,3-dihydrospiro[benzo[f]chromene-3,2-indole] with metal ions
Rostovtseva,Chernyshev,Tkachev,Aldoshin,Voloshin,Metelitsa,Makarova,Minkin
, p. 677 - 682 (2015/11/27)
5-(1,3-Benzothiazol-2-yl)substituted 1,3-dihydrospiro[benzo[f]chromene-3,2-indole] forms intensely colored complexes with metal ions in acetone solution in the absence of irradiation. The composition and stability of the complexes were shown to depend on the nature of the metal ion. The molecular structure of the zinc complex was determined by X-ray diffraction. The complexes with diamagnetic ions display negative photochromism associated with their reversible dissociation induced by visible light.
Calorimetric studies on leaching of mechanically activated sphalerite in FeCl3 solution
Xiao, Zhongliang,Chen, Qiyuan,Yin, Zhoulan,Hu, Huiping,Zhang, Pingmin
, p. 5 - 9 (2008/10/09)
The thermal behaviors of the leaching of mechanically activated sphalerite were investigated for the first time by calorimetry. The specific granulometric surface area and the structural disorder sphalerite were also analyzed by X-ray diffraction laser particle size analyzer and X-ray powder diffraction (XRD) analysis, respectively. A new method to measure the mechanically activated storage energy of minerals was proposed by designing a thermochemical cycle that made mechanically activated and non-activated mineral reaching the same final state while leaching in FeCl3 solution. The results indicate that the mechanically activated storage energy of sphalerite rises with the increased grinding time and is closely related to the lattice distortions and crystallite sizes. The calorimetric results of the products from sieved in water or ethanol medium and the products from 2 h treatment of mechanically activated sphalerite under pure argon (99.99 vol.%) at different temperatures indicate that the mechanically activated storage energy of sphalerite is caused mainly by changes of the crystal structure, and the reactivity of mechanically activated sphalerite is difficult to lose.
Establishment of the light-absorption ratio variation approach and application to determination of CO(II) in the ng ml-1 level and novel characterization of Co(II) and Zn(II) complexes with 1,5-di(2-hydroxy-5- sulfophenyl)-3-cyanoformazan
Gao, Hong-Wen,Wang, Hong-Yan,Zhang, Sheng-Yi,Zhao, Jian-Fu
, p. 1649 - 1656 (2007/10/03)
The light-absorption ratio variation approach (LARVA) has been established and applied to the determination of Co on the ng ml-1 level with 1, 5-di(2-hydroxy-5-sulfophenyl)-3-cyanoformazan (DSPCF) at pH 9.33. Competitive replacement complexatio
Copper(II) Complexes of Substitued Macrobicyclic Hexaamines: Combined Trigonal and Tetragonal Distortions
Bernhardt, Paul V.,Bramley, Richard,Engelhardt, Lutz M.,Harrowfield, Jack M.,Hockless, David C. R.,et al.
, p. 3589 - 3599 (2008/10/08)
The hexaamine complexes [M{(NH3)2sar}](4+) and [M{(NMe3)2sar}](4+) (M =Cu(II), Zn(II); sar = 3,6,10,13,16,19-hexaazabicyclo[6.6.6]icosane) have been synthetized and characterized both spectroscopically and structurally. X-ray crystal structural analyses of [Cu{(NH3)2sar}](NO3)4*H2O (monoclinic, P21, a 12.311(3) ?, b 12.338(4) ?, c 8.574 ?, β 93.91(3)°, Z = 2), [Zn{(NH3)2sar}](NO3)4*H2O (monoclinic, P21,a 12.365(4) ?, b 12.396(7) ?, c 8.587(4) ?, β 94.13(3)°, Z = 2), [Cu{(NMe3)2sar}](ClO4)4 (hexagonal P6-2C, a 8.689(2) ?, c 27.927(2) ?, Z = 2), and [Zn{(NMe3)2sar}](ClO4)4 (hexagonal,P6-2C, a 8.669(5) ?, c 27.997 ?, Z = 2) are reported. Visible-near-infrared absorption, circular dichroism, magnetic circular dichroism, and electron paramagnetic resonance spectroscopic studies reveal distorted CuN6 chromophores. Trigonal distortions arise from steric requirements of the ligands, whereas tetragonal distortions result from Jahn-Teller coupling in the Cu(II) complexes. X-ray crystallographic studies of these copper(II) complexes revealed partially averaged ([Cu{(NH3)2sar}](4+)) and completely averaged ([Cu{(NMe3)2sar}](4+)) geometries as a result of both static disorder and dynamic processes throughout each lattice. Partial resolutions of [Cu{(NMe3)2sar}](4+) into its enantiomeric forms was achieved to give the first stable chiral molecule where Cu(II) is the stereogenic atom. In the absence of Jahn-Teller coupling characteristic of their Cu(II) relatives, the analogous Zn(II) complexes exhibited high-symmetry structures both in solution and in the solid state.
Stability of ZnO Particles in Aqueous Suspensions under UV Illumination
Domenech, J.,Prieto, A.
, p. 1123 - 1126 (2007/10/02)
The effect of UV illumination on the stability of ZnO particles in aqueous suspensions is investigated.The quantity of ZnO photodecomposed has been determined by measuring polarographically the resulting Zn(II) concentration in solution at different irrad
