ChemInform Abstract: The Metal-Promoted Hydration of Di-2-pyridyl Ketone: UV-VIS Spectra of Cu(II) and Cr(III) in Aqueous Solution with Di-2-pyridyl Ketone and the X-Ray Structure Analysis of Bis-2,2′,N,N′-bipyridyl Ketone Hydrate Chromium(III) Chloride a

ChemInform ◽  
1990 ◽  
Vol 21 (39) ◽  
Author(s):  
S. SOMMERER ◽  
W. P. JENSEN ◽  
R. A. JACOBSON
Keyword(s):  
Aqueous Solution ◽  
Structure Analysis ◽  
X Ray

Die Kristallstruktur von Kalium-bis(hexamethylentetramin)-tris-(isothiocyanato)cuprat(II)-dihydrat, K[Cu(C6H12N4)2(NCS)3] · 2 H2O, einem trigonal-bipyramidalen Kupfer(II) -Komplex / The Crystal Structure of Potassium-bis(hexamethylenetetramine)-tris-(isothiocyanato) cuprate(II )-dihydrate, K[Cu(C6H12N4)2(NCS)3] · 2 H2O, a Trigonal Bipyramidal Cupric Complex

1981 ◽  
Vol 36 (5) ◽  
pp. 649-650 ◽  
Author(s):  
Joachim Pickardt
Keyword(s):  
Crystal Structure ◽  
Aqueous Solution ◽  
Structure Analysis ◽  
Title Compound ◽  
X Ray ◽  
Trigonal Bipyramidal Geometry ◽  
Trigonal Bipyramidal ◽  
Cupric Acetate

From an aqueous solution of cupric acetate containing an excess of KSCN and hexamethy- lenetetramine crystals of the title compound could be obtained. An X-ray structure analysis showed that the cuprate(II) anion has trigonal bipyramidal geometry. The three equatorial positions are occupied by NCS groups, the axial positions by the hexamethylenetetramine molecules

Xanes Investigation of Molybdate Catalysts Supported on Titania

1992 ◽  
Vol 57 (12) ◽  
pp. 2465-2474 ◽  
Author(s):  
Lukas M. J. von Hippel ◽  
Frank Hilbrig ◽  
Helmut Schmelz ◽  
Bruno Lengeler ◽  
Helmut Knözinger
Keyword(s):  
Aqueous Solution ◽  
Air Pollution ◽  
Structure Analysis ◽  
Pollution Control ◽  
Petroleum Industry ◽  
Air Pollution Control ◽  
Ammonium Heptamolybdate ◽  
X Ray ◽  
X Ray Absorption ◽  
Physical Mixtures

Molybdenum oxide supported on titania is an important material for catalytic processes in petroleum industry as well as in air pollution control. A structure analysis by means of X-ray absorption spectroscopy (XANES) is reported for sample prepared by spreading of MoO3 in physical mixtures with the support as well as by impregnation from aqueous solution. Analysis of the XANES region of the Mo K edge indicated that the surface molybdate has a structure similar to ammonium heptamolybdate.

Metallkomplexe mit biologisch wichtigen Liganden, CXIX [1]. Ein tetraedrischer Zink-Komplex (L-terf-Leucin)2ZnCl2 mit Carboxylat-koordiniertem L-terf-Leucin in der / Zwitterform Metal Complexes of Biologically Important Ligands, CXIX [1]. A Tetrahedral Zinc Complex (L-terf-Leucine)2ZnCl2 of Carboxylate Coordinated L-terr-Leucine in the Zwitterionic Form

1999 ◽  
Vol 54 (6) ◽  
pp. 734-736 ◽  
Author(s):  
Winfried Hoffmüller ◽  
Kurt Polborn ◽  
Wolfgang Beck
Keyword(s):  
Aqueous Solution ◽  
Amino Acid ◽  
Metal Complexes ◽  
Structure Analysis ◽  
Zinc Complex ◽  
Carboxylate Group ◽  
Tetrahedral Structure ◽  
X Ray ◽  
Zwitterionic Form

From an aqueous solution of ZnCl2 and L-terMeucine the complex (L-terr-Leucine)2ZnCl2 · 2 CH3OH with a distorted tetrahedral structure is formed in which, according to an X-ray structure analysis, the zwitterionic form o f the amino acid is coordinated through the carboxylate group

Copper Complexes with the Ligand [Cp2MoH2]

1999 ◽  
Vol 54 (3) ◽  
pp. 337-340 ◽  
Author(s):  
Henri Brunner ◽  
Manfred Muschiol ◽  
Thomas Neuhierl ◽  
Bernhard Nuber
Keyword(s):  
Aqueous Solution ◽  
Structure Analysis ◽  
Copper Complexes ◽  
Chloride Ion ◽  
Molar Ratio ◽  
Fourier Methods ◽  
Polymeric Structure ◽  
X Ray ◽  
Difference Fourier ◽  
Hydride Ligands

The reaction of CuCl with [CP2MoH2] yields the complex [Cu(Cp2MoH2)2Cl]. An X-ray structure analysis shows that the coordination of the copper(I) ion by two [CP2MoH2] ligands and the chloride ion is pseudo-trigonal planar. The hydride ligands were located by using difference Fourier methods. A manifold of reactions took place when an aqueous solution of CUSO4 was treated with a solution of [Cp2MoH2] in dichloromethane in a 1:2 molar ratio. The X-ray structure analysis established a polymeric structure of the complex [Cu(Cp2MoH2)2Cu(Cp2MoH2)SO4]n with two different copper centers.

scholarly journals An extended X-ray absorption fine structure analysis of the local structure for zirconium(IV) in acidic aqueous solution.

1986 ◽  
Vol 35 (8) ◽  
pp. 785-788 ◽  
Author(s):  
Nobuaki OGAWA ◽  
Hideto SAKANE ◽  
Takashi MIYANAGA ◽  
Nobuyuki MATSUBAYASHI ◽  
Shigero IKEDA
Keyword(s):  
Aqueous Solution ◽  
Fine Structure ◽  
Structure Analysis ◽  
Local Structure ◽  
Acidic Aqueous Solution ◽  
X Ray ◽  
Absorption Fine ◽  
Fine Structure Analysis ◽  
X Ray Absorption

scholarly journals Pentanuclear Hetero-bimetallic 3d-4f Complexes of the Ln2Ni3 type: Pr2Ni3 and Gd2Ni3

2018 ◽  
Author(s):  
Jana König ◽  
Alexandra Kelling ◽  
Uwe Schilde ◽  
Peter Strauch ◽  
Andreas Taubert
Keyword(s):  
Aqueous Solution ◽  
Ir Spectroscopy ◽  
Single Crystal ◽  
Structure Analysis ◽  
Powder Diffraction ◽  
Lanthanide Ions ◽  
Bimetallic Complexes ◽  
Space Group ◽  
X Ray

In aqueous solution planar bis(1,2-dithiooxalato)nickelates(II), [Ni(dto)2]2- react with lanthanide ions (Ln3+) to form pentanuclear, hetero-bimetallic complexes of the general composition [{Ln(H2O)n}2{Ni(dto)2}3] · x H2O (n = 4 or 5; x = 9 - 12). Two complexes of this series, [{Pr(H2O)5}2{Ni(dto)2}3] · 11 H2O, Pr2Ni3 1 and [{Gd(H2O)5}2{Ni(dto)2}3] · 11 H2O, Gd2Ni3 2 were synthesized and characterized by single crystal X-ray structure analysis, X-ray powder diffraction, and IR spectroscopy. All Ln2Ni3 complexes crystallize as monoclinic crystals in the space group P21/c.

Structural Study of a new Compound Based on Acid 1,4-Cyclohexanedicarboxylic (1,4-CDC)

2010 ◽  
Vol 6 (1) ◽  
pp. 891-896
Author(s):  
Manel Halouani ◽  
M. Dammak ◽  
N. Audebrand ◽  
L. Ktari
Keyword(s):  
Aqueous Solution ◽  
Water Molecules ◽  
Carboxyl Group ◽  
X Ray Diffraction ◽  
Compound I ◽  
Unit Cell Parameters ◽  
Monoclinic System ◽  
X Ray ◽  
Cell Parameters ◽  
Cyclohexanedicarboxylic Acid

One nickel 1,4-cyclohexanedicarboxylate coordination polymers, Ni2 [(O10C6H4)(COO)2].2H2O  (I), was hydrothermally synthesized from an aqueous solution of Ni (NO3)2.6H2O, (1,4-CDC) (1,4-CDC = 1,4-cyclohexanedicarboxylic acid) and tetramethylammonium nitrate. Compound (I) crystallizes in the monoclinic system with the C2/m space group. The unit cell parameters are a = 20.1160 (16) Å, b = 9.9387 (10) Å, c = 6.3672 (6) Å, β = 97.007 (3) (°), V= 1263.5 (2) (Å3) and Dx= 1.751g/cm3. The refinement converged into R= 0.036 and RW = 0.092. The structure, determined by single crystal X-ray diffraction, consists of two nickel atoms Ni (1) and Ni (2). Lots of ways of which is surrounded by six oxygen atoms, a carboxyl group and two water molecules.

Heterogeneous Fenton Catalytic Removal of Organic Pollutant in Aqueous Solution by using Coal Gangue as a Catalyst

2019 ◽  
Vol 12 (4) ◽  
pp. 312-325
Author(s):  
Jiwei Zhang ◽  
Jingjing Xu ◽  
Shuaixia Liu ◽  
Baoxiang Gu ◽  
Feng Chen ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Hydrogen Peroxide ◽  
Hydroxyl Radical ◽  
Removal Rate ◽  
Organic Pollutant ◽  
Coal Gangue ◽  
Ion Leakage ◽  
Heterogeneous Fenton ◽  
Solution Ph ◽  
X Ray

Background: Coal gangue was used as a catalyst in heterogeneous Fenton process for the degradation of azo dye and phenol. The influencing factors, such as solution pH gangue concentration and hydrogen peroxide dosage were investigated, and the reaction mechanism between coal gangue and hydrogen peroxide was also discussed. Methods: Experimental results showed that coal gangue has the ability to activate hydrogen peroxide to degrade environmental pollutants in aqueous solution. Under optimal conditions, after 60 minutes of treatment, more than 90.57% of reactive red dye was removed, and the removal efficiency of Chemical Oxygen Demand (COD) up to 72.83%. Results: Both hydroxyl radical and superoxide radical anion participated in the degradation of organic pollutant but hydroxyl radical predominated. Stability tests for coal gangue were also carried out via the continuous degradation experiment and ion leakage analysis. After five times continuous degradation, dye removal rate decreased slightly and the leached Fe was still at very low level (2.24-3.02 mg L-1). The results of Scanning Electron Microscope (SEM), energy dispersive X-Ray Spectrometer (EDS) and X-Ray Powder Diffraction (XRD) indicated that coal gangue catalyst is stable after five times continuous reuse. Conclusion: The progress in this research suggested that coal gangue is a potential nature catalyst for the efficient degradation of organic pollutant in water and wastewater via the Fenton reaction.

Absolute Stereochemistry of (-)-Wieland-Miescher Ketone as Established by the X-ray Crystallographic and CD Exciton Chirality Methods

1992 ◽  
Vol 57 (7) ◽  
pp. 1459-1465 ◽  
Author(s):  
Nobuyuki Harada ◽  
Tatsuo Sugioka ◽  
Hisashi Uda ◽  
Takeo Kuriki
Keyword(s):  
Structure Analysis ◽  
Absolute Configuration ◽  
X Ray ◽  
The Absolute ◽  
Absolute Stereochemistry

The 8aR absolute stereochemistry of Wieland-Miescher ketone (-)-I was established by the X-ray structure analysis of its bis(4-bromobenzoate) derivatives (1R,6R,8aR)-(+)-IV and (1R,6S,8aR)-(-)-V. The absolute configuration of (-)-I was corroborated further by the application of the CD exciton chirality method to bis(4-bromobenzoates) (+)-IV and (-)-V.

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