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SPECTRAL STUDY ON A NEW 3d_z^2 TYPE COPPER(Ⅱ)COMPLEX OF PHENOLIC POLYMERIC CROWN ETHER
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作者 Jian Bo LIU Yong LI Jin Liang GUO DEPARTMENT OF CHEMISTRY,TSINGHUA UNIVERSITY,BEIJING,100084 《Chinese Chemical Letters》 SCIE CAS CSCD 1993年第8期745-748,共4页
ESR and IR measurements have been carried out for a copper(Ⅱ)complex of phenolic polymeric crown ether,As a result,the triplet ESR spectrum(S=1)of 3d_z2 ground state copper(Ⅱ)ions was first observed for the powder s... ESR and IR measurements have been carried out for a copper(Ⅱ)complex of phenolic polymeric crown ether,As a result,the triplet ESR spectrum(S=1)of 3d_z2 ground state copper(Ⅱ)ions was first observed for the powder sample.It indicated that there existed intramolecular spin-spin interaction betweeen 3d_Z2 ground state copper(Ⅱ)and copper(Ⅱ)ions.In this binuclear triplet cluster,the axial ligntion of one water molecule in a sandwich position to two adjacent copper(Ⅱ) ions was also confirmed by IR spectra,All things considered,a possible structure for the complex was proposed. 展开更多
关键词 spectral study ON A NEW 3d_z~2 TYPE COPPER COMPLEX OF PHENOLIC POLYMERIC CROWN ETHER Cu
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SPECTRAL CHARACTERISTICS OF ELECTRORETINOGRAM IN X-LINKED DICHROMATS-A PRELIMINARY STUDY
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作者 Nong Tian De-Zheng Wu Shi-zhou Huang Jiong-ji Liang Zhongshan Ophthalmic Center Sun Yat-sen University of Medical Sciences Guangzhou 510060, China. 《眼科学报》 1991年第3期146-150,共5页
Spectral characteristics of X-linked Dichromats(13 protanopes, 20 deuteranopes) were studied with spectral ERG. The results are as follows: The maximal spectral response of the b-wave in protanopes tended to shift tow... Spectral characteristics of X-linked Dichromats(13 protanopes, 20 deuteranopes) were studied with spectral ERG. The results are as follows: The maximal spectral response of the b-wave in protanopes tended to shift toward the short wavelength side and the sensitivity to long wavelengths decreased obviously. The ratio value of the amplitude in 500nm and in 620nm(500/620) was greater in the protanope than that in the normal subject. Like the normals, the maximal response of the b-wave in deuteranopes appea... 展开更多
关键词 spectral CHARACTERISTICS OF ELECTRORETINOGRAM IN X-LINKED DICHROMATS-A PRELIMINARY study
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Structural and Spectral Studies of Some Geometric Isomers of N-Pivaloyl-Nˊ-dichlorophenyl Thiourea
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作者 Muhammad Khawar Rauf Masahiro Ebihara +1 位作者 Sarwat Sultana Amin Badshah 《Chinese Journal of Structural Chemistry》 SCIE CAS CSCD 2013年第3期349-356,共8页
N-pivaloyl-Nˊ-(3,4-dichlorophenyl)thiourea (1): monoclinic, P21/a, a=11.57(1), b=9.278(8), c=13.51(1), β=103.85(1)°, V=1408(2)3 , Z=4, μ=0.598 mm-1 ; N-pivaloyl-N'-(3,5- dichlorophenyl)thiour... N-pivaloyl-Nˊ-(3,4-dichlorophenyl)thiourea (1): monoclinic, P21/a, a=11.57(1), b=9.278(8), c=13.51(1), β=103.85(1)°, V=1408(2)3 , Z=4, μ=0.598 mm-1 ; N-pivaloyl-N'-(3,5- dichlorophenyl)thiourea (2): monoclinic, P21/a, a=7.176(2), b=16.441(4), c=11.923(2), β=92.48(1)°, V=1405.3(6)3 , Z=4, μ=0.600 mm-1 ; N-pivaloyl-Nˊ-(2,6-dichlorophenyl)thiourea (3): orthorhombic, Pnma, a=26.79(1), b=8.780(4), c=5.955(3), V=1400.7(11)3 , Z=4, μ=0.601 mm-1 . All three complexes have an intramolecular hydrogen bond between NˊH and the carbonyl oxygen. Solution 1H NMR studies (CDCl3) show the NH resonance considerable downfield for each thiourea and their positions, as well as that of NH, is affected by substituents on the phenyl ring. 展开更多
关键词 pivaloyl thioureas single-crystal XRD-studies hydrogen bonds spectral studies mirror plane
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Analytical, Spectral, Thermal and Molecular Modeling Studies of Hg2+-2,3-Butanedionemonoxime Girard’s T Hydrazone Complex and Its Application
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作者 Najlaa S. Al-Radadi Magda M. Akl +1 位作者 Mohamed A. Elbeshlawi Mohsen M. Mostafa 《Open Journal of Inorganic Chemistry》 2016年第1期1-14,共14页
The coordination behavior of 2,3-butanedionemonoxime Girard’s T hydrazone (L<sup>1</sup>) towards Hg<sup>2+</sup> ion has been investigated. The structure of Hg<sup>2+</sup> comple... The coordination behavior of 2,3-butanedionemonoxime Girard’s T hydrazone (L<sup>1</sup>) towards Hg<sup>2+</sup> ion has been investigated. The structure of Hg<sup>2+</sup> complex, [Hg(L<sup>1</sup>)Cl]Cl·5H<sub>2</sub>O, is elucidated using elemental analyses, spectral (IR, UV-visible, 1H-NMR and mass) and TGA measurements. IR spectrum suggests that L<sup>1</sup> behaves in a bidentate manner through the azomethine groups. The molecular modeling of L<sup>1</sup> and its Hg<sup>2+</sup> complex has been investigated. The bond lengths, bond angles, HOMO and LUMO have been calculated. The thermal behavior and kinetic parameters are determined using Coats-Redfern method. The use of L<sup>1</sup> for preconcentration and separation via flotation of Hg<sup>2+</sup> complex and determination using cold vapor atomic spectrometry (CVAAS) is described. The effects on the percentage of recovered Hg<sup>2+</sup> by pH of sample solutions, oleic acid (HOL) concentration, Hg<sup>2+</sup> and L<sup>1</sup> concentrations are studied in details. The method is applied for the determination of the total Hg<sup>2+</sup> (mg·mL<sup>-1</sup>) in natural water samples. 展开更多
关键词 Mercury Complex 2 3-Butanedionemonoxime Girard’s T Hydrazone Modeling spectral Studies Separation Using Flotation Method
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Removal of Pollutants of Landfill Leachate by Recirculation 被引量:1
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作者 LI Ye WANG Lina ZHENG Shizhong 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2008年第2期281-284,共4页
SAfter leached from municipal solid waste landfill was treated by recirculation, the concentration of pollutants decreases greatly, and the moisture content of the solid waste in landfill site was increased and waste ... SAfter leached from municipal solid waste landfill was treated by recirculation, the concentration of pollutants decreases greatly, and the moisture content of the solid waste in landfill site was increased and waste stabilization rate was accelerated. Compared with traditional treatment methods, this method offers more important practical values, including short investment, enhanced treatment efficiency and facilitated operation and management. The experimental results indicated that a 99.9% removal of ammonia nitrogen and an 80.5% removal of COD were obtained, when hydraulic power surface load is 15.92 L/m^2·d, and organic surface load is 25.54 g/m^2·d. 展开更多
关键词 heteropolyoxometalates molybdotungstosilicic acid cetyltrimethylammonium bromide IR spectral and thermal study
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Preparation and Properties of the Heteropolyoxometalates of Large Organic Cation with Molybdotungstosilicic Acids
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作者 WANG Dunjia FANG Zhengdong WEI Xianhong 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2008年第2期198-203,共6页
Some new heteropolyoxometalates of large organic cations with molybdotungstosilicic acids (general formula: (CTMA)4SiMoxW12-xO40·mH2O·nDMF, x=0,2,4,6,8,10,12) were prepared by the reaction of cetyltrime... Some new heteropolyoxometalates of large organic cations with molybdotungstosilicic acids (general formula: (CTMA)4SiMoxW12-xO40·mH2O·nDMF, x=0,2,4,6,8,10,12) were prepared by the reaction of cetyltrimethylammonium bromide (CTMAB,C16H33N(CH3)3Br) with H4SiMoxW12-xO40(x=0,2,4,6,8,10,12) in aqueous solution and recrystallization in DMF, and characterized by elemental analysis, IR spectra,TG- DTA and XRD techniques. The IR spectrum confirms the presence of Keggin structure and organic cations in these compounds, and it is indicated that the stretching vibration of the M-Od, M-Ob-M and Si-Oa becomes more red-shifted when molybdenum is gradually substituted for the tungsten atom. In particular, the thermal decomposition of the heteropolyoxometalates was studied in nitrogen atmosphere. The TG-DTA curves show that their thermal behaviors not only contain the release of water molecule, DMF molecule, CTMA and its fragments but also contains simultaneous collapse of Keggin anion. Their end products of the thermal decomposition are the mixture of WO3, MoO3 and SiO2. And from the final decomposition temperature of view, it is found that the thermal stability of these compounds gradually is decreased when the number of molybdenum atoms is increased. 展开更多
关键词 heteropolyoxometalates molybdotungstosilicic acid cetyltrimethylammonium bromide IR spectral and thermal study
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Study on the key technology of spectral reflectivity reconstruction based on sparse prior by a single-pixel detector 被引量:1
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作者 Leihong Zhang Dong Liang +4 位作者 Bei Li Yi Kang Zilan Pan Dawei Zhang Xiuhua Ma 《Photonics Research》 SCIE EI 2016年第3期115-121,共7页
By studying the traditional spectral reflectance reconstruction method, spectral reflectance and the relative spectral power distribution of a lighting source are sparsely decomposed, and the orthogonal property of th... By studying the traditional spectral reflectance reconstruction method, spectral reflectance and the relative spectral power distribution of a lighting source are sparsely decomposed, and the orthogonal property of the principal component orthogonal basis is used to eliminate basis; then spectral reflectance data are obtained by solving a sparse coefficient. After theoretical analysis, the spectral reflectance reconstruction based on sparse prior knowledge of the principal component orthogonal basis by a single-pixel detector is carried out by software simulation and experiment. It can reduce the complexity and cost of the system, and has certain significance for the improvement of multispectral image acquisition technology. 展开更多
关键词 study on the key technology of spectral reflectivity reconstruction based on sparse prior by a single-pixel detector
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Studies on the Growth and Characterization of L-Arginine Maleate Dihydrate Crystal Grown from Liquid Diffusion Technique
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作者 K. Ramya C. Ramachandra Raja 《Journal of Minerals and Materials Characterization and Engineering》 2016年第2期143-153,共11页
Nonlinear optical crystals of L-Arginine maleate dihydrate were grown from liquid diffusion method. The lattice parameters of the crystal were identified using single crystal and powder crystal X-ray diffraction analy... Nonlinear optical crystals of L-Arginine maleate dihydrate were grown from liquid diffusion method. The lattice parameters of the crystal were identified using single crystal and powder crystal X-ray diffraction analyses. Fourier transform infrared spectroscopy and Fourier transform Raman spectroscopy were made to study the vibrational functional groups in the grown crystal. Optical absorption and transmission ranges were measured from UV-VIS-NIR spectrum. The molecular structure of the crystal is established through <sup>1</sup>H-NMR and <sup>13</sup>C-NMR studies. Thermal stabilities and decomposition of the grown crystal were studied from TG/DTA and DSC analyses. Nonlinear optical property of the crystal was determined by Kurtz and Perry powder technique. 展开更多
关键词 Amino Acids Liquid Diffusion Method NMR spectral Studies Nonlinear Optical Material
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Chemical Constituents from Caesalpinia férrea:Identification and ^(1)H and ^(13)C Resonance Assignment
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作者 Islay Lima Magalhaes Francisco Chagas Lima Pinto +3 位作者 Raimundo Braz Filho Daniele Alves Ferreira Telma Leda Gomes de Lemos Francisco José Queiroz Monte 《American Journal of Analytical Chemistry》 2014年第10期688-694,共7页
In a phytochemical investigation of Caesalpinia ferrea (Leguminosae), four aromatic compounds (1-4) have been isolated and identified. Their structures have been assigned based on data provided by spectroscopic techni... In a phytochemical investigation of Caesalpinia ferrea (Leguminosae), four aromatic compounds (1-4) have been isolated and identified. Their structures have been assigned based on data provided by spectroscopic techniques, including 2D NMR experiments. Compounds 3 and 4 are being reported for the first time for Cesalpina ferrea. 展开更多
关键词 Caesalpinia ferrea LEGUMINOSAE Aromatic Compounds spectral Studies
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Parametric study of a new HOS-CFD coupling method 被引量:9
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作者 Yuan Zhuang De-cheng Wan 《Journal of Hydrodynamics》 SCIE EI CSCD 2021年第1期43-54,共12页
This paper presents a developed new coupled method which combined our in-house CFD solver naoe-FOAM-SJTU and naoe-FOAM-os with a potential theory High Order Spectral method(HOS).A parametric study of nonlinear wave pr... This paper presents a developed new coupled method which combined our in-house CFD solver naoe-FOAM-SJTU and naoe-FOAM-os with a potential theory High Order Spectral method(HOS).A parametric study of nonlinear wave propagation in computational fluid dynamics(CFD)zone is considered.Mesh convergence,time step convergence,time discretization scheme and length of relaxation zone are all carried out.Those parametric studies verify the steady of this new combined method and give better choice for wave propagation.The dissipation in propagation of nonlinear regular wave can be lower than 3%in static mesh,and less than 2%in overset grid mesh.Meanwhile,a LNG FPSO is put into the viscous wave tank to study the suitable size of CFD zone.To achieve a better solution with least calculating resources and best numerical results,the length of CFD zone is discussed.These parametric studies can give reference upon employment of the potential-viscous coupled method and validation of the coupled method. 展开更多
关键词 High Order spectral method(HOS)parametric study naoe-FOAM-SJTU solver potential-viscous coupled method
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Preparation, Characterization, Biological Activity and 3D Molecular Modeling of Mn(Ⅱ), Co(Ⅱ), Ni(Ⅱ), Cu(Ⅱ), Pd(Ⅱ) and Ru(Ⅲ) Complexes of Some Sulfadrug Schiff Bases 被引量:1
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作者 EL-Ghamry,H.A. Sakai,K. +2 位作者 Masaoka,S. EI-Baradie,K.Y Issa,R.M. 《Chinese Journal of Chemistry》 SCIE CAS CSCD 2012年第4期881-890,共10页
Mn(Ⅱ), Co(Ⅱ), Ni(Ⅱ), Cu(Ⅱ), Pd(Ⅱ) and Ru(Ⅲ) complexes of Schiff bases derived from the condensation of sulfaguanidine with 2,4-dihydroxy benzaldehyde (HL1), 2-hydroxy-l-naphthaldehyde (HL2) and ... Mn(Ⅱ), Co(Ⅱ), Ni(Ⅱ), Cu(Ⅱ), Pd(Ⅱ) and Ru(Ⅲ) complexes of Schiff bases derived from the condensation of sulfaguanidine with 2,4-dihydroxy benzaldehyde (HL1), 2-hydroxy-l-naphthaldehyde (HL2) and salicylaldehyde (HL3) have been synthesized. The structures of the prepared metal complexes were proposed based on elemental analysis, molar conductance, thermal analysis (TGA, DSC and DTG), magnetic susceptibility measurements and spectroscopic techniques (IR, UV-Vis, and ESR). In all complexes, the ligand bonds to the metal ion through the azomethine nitrogen and a-hydroxy oxygen atoms. The structures of Pd(Ⅱ) complex 8 and Ru(Ⅲ) complex 9 were found to be polynuclear. Two kinds of stereochemical geometries; distorted tetrahedral and distorted square py- ramidal, have been realized for the Cu(Ⅱ) complexes based on the results of UV-Vis, magnetic susceptibility and ESR spectra whereas octahedral geometry was predicted for Co(Ⅱ), Mn(Ⅱ) and Ru(Ⅲ) complexes. Ni(Ⅱ) com- plexes were predicted to be square planar and tetrahedral and Pd(Ⅱ) complexes were found to be square planar. The antimicrobial activity of the ligands and their metal complexes was also investigated against the gram-positive bac- teria Staphylococcus aures and Bacillus subtilis and gram-negative bacteria, Escherichia coli and Pesudomonas aeruginosa, by using the agar dilution method. Chloramphenicol was used as standard compound. The obtained data revealed that the metal complexes are more or less, active than the parent ligand and standard. The X-ray crys- tal structure of HL3 has been also reported. 展开更多
关键词 sulfaguanidine transition metal complexes spectral studies biological activity crystal structure mo- lecular modeling
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