Molybdenum (VI) complex, namely molybdenum dioxobis(2,4-pentanedione) [MoO2(acac)2] used as epoxidation catalyst species, was synthesized and characterized by elemental analysis and infrared spectrum. Polystyrene-supp...Molybdenum (VI) complex, namely molybdenum dioxobis(2,4-pentanedione) [MoO2(acac)2] used as epoxidation catalyst species, was synthesized and characterized by elemental analysis and infrared spectrum. Polystyrene-supported molybdenum dioxobis(2,4-pentanedione) [MoO2(acac)2] for synthesis of epoxycyclohexane was prepared by phase transfer catalysis method. Effects of various factors in synthesis of epoxycyclohexane by reaction of cyclohexene and t-BuOOH in the atmosphere of nitrogen catalyzed by polystyrene-supported MoO2(acac)2 were also investigated. Under the following conditions, n(cyclohexene):n(t-BuOOH)=3.5:l (based on 0.1 mol of t-BuOOH), volume of solvent -10ml, reaction temperature -80℃, reaction time -60min, and mass of molybdenum in the catalyst -2.30×0^(-3)g, the yield of epoxycyclohexane on the basis of t-BuOOH is over 99.5%, and the purity of epoxycyclohexane is about 99.9% by gas chromatogram(GC) analysis.展开更多
We first received and examined X-ray and IR （infra red） spectroscopy of uranium complexes with sugars. We proposed a method for direct synthesis of complex organic compounds, uranium chloride UO2Cl2 with various sug...We first received and examined X-ray and IR （infra red） spectroscopy of uranium complexes with sugars. We proposed a method for direct synthesis of complex organic compounds, uranium chloride UO2Cl2 with various sugars （D-glucose, D （＋） maltose, D-sucrose, D-lactose and the polysaccharide Dextran） as potential precursors for the treatment of cancer diseases.展开更多
In this paper detailed studies of the cyclic voltammetry(CV) of trinuclear metal cluster compounds [M_3O_2(O_2CCH_3,)6(H,O),j z+ (M,=Mo3,MoW2,W3) are reported.The result of CV shows that they are similar to each other...In this paper detailed studies of the cyclic voltammetry(CV) of trinuclear metal cluster compounds [M_3O_2(O_2CCH_3,)6(H,O),j z+ (M,=Mo3,MoW2,W3) are reported.The result of CV shows that they are similar to each other.There are a reversible redox peak near-0. 48 V and an irreversible reduced peak near-1.10 V in the scan range of + l.0 V to l. 5 V.It implies that the M_3O_2,clusters might gain one electron to be further reduced.But the two-electron-reduced product of M_3O_2 clusters are instable.The theoretical calculations(EHMO) agree well with the result of the CV experiment.展开更多
A new MeTAMP （thiazolylazo dye ligand 2-[2-（5-methyl thiazolyl）azo]-4-methoxy phenol） was prepared by coupling reaction between 5-methyl thiazolylazonium chloride with 4-methoxy phenol in alkaline alcoholic soluti...A new MeTAMP （thiazolylazo dye ligand 2-[2-（5-methyl thiazolyl）azo]-4-methoxy phenol） was prepared by coupling reaction between 5-methyl thiazolylazonium chloride with 4-methoxy phenol in alkaline alcoholic solution. The structure of azo dye ligand has been characterized by available technique such as 1H-NMR, mass spectrum, FT-IR, UV-vis and elemental analysis. Eight new chelate complexes of Cr（III）, Mn（II）, Fe（II）, Fe（III）, Co（III）, Ni（II）, Cu（II） and Zn（II） ions were prepared and identified by elemental analysis, atomic absorption, magnetic susceptibility, molar conductance measurements, FT-IR and electronic spectra. The spectral and analytical data show that the ligand a tridentate and coordinating with metal ions through the phenolate O, azo N atom which is the farthest of thiazole molecule and with thiazole N atom. The molar ratio （M：L） was also studied which was found 1：1 for Zn（II） and 1：2 for the rest metal ions. Conductivity measurements for prepared complexes showed 1：1 electrolyte for Cr（III）, Fe（IlI）, and Co（llI） complexes and non-electrolyte for rest complexes. Stability constants of complexes were calculated by spectrophotometry. Octahedral configuration suggested for Cr（III）, Mn（II）, Fe（II）, Fe（III）, Co（III）, Ni（II） and Cu（II） but tetrahedral for Zn（IlI） complex. The solid complexes are found to have the general formula IML2]Cl H2O where M = Cr（III）, Fe（III） and Co（IIl） and [ML2] H2O where M = Mn（II）, Fe（II）, Ni（II） and Cu（II） while [MLCI].H20 for Zn（II）-complex. The biological activity of ligand and its complexes against five types of bacteria, Strepto coccus and Staphylococcus aureus as example of gram positive, Pseudomonas, Proteus and Esherichia coli as example of gram negative bacteria by agar plate different technique was studied. The activity was also assayed on molecular level by using PCR in an attempt to monitor DNA banding pattern.展开更多
A facile and user friendly technique to immobilize the late-transition metal complexes on spherical MgCl2/SiO2/THF support has been developed. The spherical MgCl2/SiO2/THF-supported late-transition metal catalysts 2,6...A facile and user friendly technique to immobilize the late-transition metal complexes on spherical MgCl2/SiO2/THF support has been developed. The spherical MgCl2/SiO2/THF-supported late-transition metal catalysts 2,6-bis-[1-(2,6-dimethylphenylimino)ethyl]pyridine iron(II) dichloride(SC-A) and 1,4-bis(2,6-dimethylphenyl)- acenaphthene diimine nickel(II) dibromide(SC-B) for ethylene polymerization has been prepared by spray-drying technique using tetrahydrofuran suspension containing MgCl2, SiO2 and late-transition metal complexes. The catalysts were characterized by BET, XRD, SEM and the polymers were analyzed using GPC, DSC and 13C-NMR. The test results show that spray-drying is a very effective method for immobilizing late-transition metal catalysts for ethylene polymerization. Among six kinds of cocatalysts for olefin polymerization, TMA and TEA were confirmed to be more effective than other compounds for the ethylene polymerization system using the catalyst SC-A. For the case of the catalyst SC-B, DEAC showed the best performance as cocatalysts in ethylene polymerization. The replication of the catalyst morphology was found in the resultant polyethylene.展开更多
Three new iron（Ⅲ） phosphonate cage-like complexes with [Fe4], [Feg] and [Fe14] cores have been synthesized by solvothermal reaction with various starting materials. Magnetic studies show overall antiferromagnetic i...Three new iron（Ⅲ） phosphonate cage-like complexes with [Fe4], [Feg] and [Fe14] cores have been synthesized by solvothermal reaction with various starting materials. Magnetic studies show overall antiferromagnetic interaction presented in these cages.展开更多
The morphology and structure of zinc oxide(ZnO), one of the important semiconductors, are relevant to its properties and applications. The preparation of ZnO with tunable morphology and desired structure is an attract...The morphology and structure of zinc oxide(ZnO), one of the important semiconductors, are relevant to its properties and applications. The preparation of ZnO with tunable morphology and desired structure is an attractive topic in the field of material synthesis. This work reports a facile method for the synthesis of Zn O with controllable morphology and crystal orientation using Zn-based coordination polymer particles(Zn-CPP) as precursors. Using hydrothermal method, Zn-CPP with morphologies of microrod, nanoplate, flower-like, arrow-tipped microsheet, and square cylinder were successfully synthesized via the coordination between metal ions Zn2+ and organic ligand 1,4,5,8-naphthalenetetracarboxylic dianhydride in aqueous solution. Subsequent thermal treatment of the Zn-CPP successfully resulted in the formation of porous Zn O with similar morphology to Zn-CPP. It is also found that the Zn O with enhanced(002) orientation could be obtained from Zn-CPP with preferred(002) orientation. This strategy could be extended for the preparation of other metal oxides with desired shape and structure.展开更多
基金Supported by the Outstanding Personality Innovation Funds of Henan Province(No.0121001900).
文摘Molybdenum (VI) complex, namely molybdenum dioxobis(2,4-pentanedione) [MoO2(acac)2] used as epoxidation catalyst species, was synthesized and characterized by elemental analysis and infrared spectrum. Polystyrene-supported molybdenum dioxobis(2,4-pentanedione) [MoO2(acac)2] for synthesis of epoxycyclohexane was prepared by phase transfer catalysis method. Effects of various factors in synthesis of epoxycyclohexane by reaction of cyclohexene and t-BuOOH in the atmosphere of nitrogen catalyzed by polystyrene-supported MoO2(acac)2 were also investigated. Under the following conditions, n(cyclohexene):n(t-BuOOH)=3.5:l (based on 0.1 mol of t-BuOOH), volume of solvent -10ml, reaction temperature -80℃, reaction time -60min, and mass of molybdenum in the catalyst -2.30×0^(-3)g, the yield of epoxycyclohexane on the basis of t-BuOOH is over 99.5%, and the purity of epoxycyclohexane is about 99.9% by gas chromatogram(GC) analysis.
文摘We first received and examined X-ray and IR （infra red） spectroscopy of uranium complexes with sugars. We proposed a method for direct synthesis of complex organic compounds, uranium chloride UO2Cl2 with various sugars （D-glucose, D （＋） maltose, D-sucrose, D-lactose and the polysaccharide Dextran） as potential precursors for the treatment of cancer diseases.
文摘In this paper detailed studies of the cyclic voltammetry(CV) of trinuclear metal cluster compounds [M_3O_2(O_2CCH_3,)6(H,O),j z+ (M,=Mo3,MoW2,W3) are reported.The result of CV shows that they are similar to each other.There are a reversible redox peak near-0. 48 V and an irreversible reduced peak near-1.10 V in the scan range of + l.0 V to l. 5 V.It implies that the M_3O_2,clusters might gain one electron to be further reduced.But the two-electron-reduced product of M_3O_2 clusters are instable.The theoretical calculations(EHMO) agree well with the result of the CV experiment.
文摘A new MeTAMP （thiazolylazo dye ligand 2-[2-（5-methyl thiazolyl）azo]-4-methoxy phenol） was prepared by coupling reaction between 5-methyl thiazolylazonium chloride with 4-methoxy phenol in alkaline alcoholic solution. The structure of azo dye ligand has been characterized by available technique such as 1H-NMR, mass spectrum, FT-IR, UV-vis and elemental analysis. Eight new chelate complexes of Cr（III）, Mn（II）, Fe（II）, Fe（III）, Co（III）, Ni（II）, Cu（II） and Zn（II） ions were prepared and identified by elemental analysis, atomic absorption, magnetic susceptibility, molar conductance measurements, FT-IR and electronic spectra. The spectral and analytical data show that the ligand a tridentate and coordinating with metal ions through the phenolate O, azo N atom which is the farthest of thiazole molecule and with thiazole N atom. The molar ratio （M：L） was also studied which was found 1：1 for Zn（II） and 1：2 for the rest metal ions. Conductivity measurements for prepared complexes showed 1：1 electrolyte for Cr（III）, Fe（IlI）, and Co（llI） complexes and non-electrolyte for rest complexes. Stability constants of complexes were calculated by spectrophotometry. Octahedral configuration suggested for Cr（III）, Mn（II）, Fe（II）, Fe（III）, Co（III）, Ni（II） and Cu（II） but tetrahedral for Zn（IlI） complex. The solid complexes are found to have the general formula IML2]Cl H2O where M = Cr（III）, Fe（III） and Co（IIl） and [ML2] H2O where M = Mn（II）, Fe（II）, Ni（II） and Cu（II） while [MLCI].H20 for Zn（II）-complex. The biological activity of ligand and its complexes against five types of bacteria, Strepto coccus and Staphylococcus aureus as example of gram positive, Pseudomonas, Proteus and Esherichia coli as example of gram negative bacteria by agar plate different technique was studied. The activity was also assayed on molecular level by using PCR in an attempt to monitor DNA banding pattern.
基金supported by the National Natural Science Foundation of China (Grant No.U1162114)the Science Foundation of Tianjin University of Science & Technology (20090420)
文摘A facile and user friendly technique to immobilize the late-transition metal complexes on spherical MgCl2/SiO2/THF support has been developed. The spherical MgCl2/SiO2/THF-supported late-transition metal catalysts 2,6-bis-[1-(2,6-dimethylphenylimino)ethyl]pyridine iron(II) dichloride(SC-A) and 1,4-bis(2,6-dimethylphenyl)- acenaphthene diimine nickel(II) dibromide(SC-B) for ethylene polymerization has been prepared by spray-drying technique using tetrahydrofuran suspension containing MgCl2, SiO2 and late-transition metal complexes. The catalysts were characterized by BET, XRD, SEM and the polymers were analyzed using GPC, DSC and 13C-NMR. The test results show that spray-drying is a very effective method for immobilizing late-transition metal catalysts for ethylene polymerization. Among six kinds of cocatalysts for olefin polymerization, TMA and TEA were confirmed to be more effective than other compounds for the ethylene polymerization system using the catalyst SC-A. For the case of the catalyst SC-B, DEAC showed the best performance as cocatalysts in ethylene polymerization. The replication of the catalyst morphology was found in the resultant polyethylene.
基金financially supported by Marie Curie International Incoming Fellowship (E.C. Contract No: PIIF-GA-2008-219588)the starting fund of Xi’an Jiaotong University (to YZZ)+1 种基金the Engineering and Physical Science Research Council (UK)the Royal Society for a Wolfson Merit Award (to REPW)
文摘Three new iron（Ⅲ） phosphonate cage-like complexes with [Fe4], [Feg] and [Fe14] cores have been synthesized by solvothermal reaction with various starting materials. Magnetic studies show overall antiferromagnetic interaction presented in these cages.
基金supported by the National Natural Science Foundation of China(21325313)
文摘The morphology and structure of zinc oxide(ZnO), one of the important semiconductors, are relevant to its properties and applications. The preparation of ZnO with tunable morphology and desired structure is an attractive topic in the field of material synthesis. This work reports a facile method for the synthesis of Zn O with controllable morphology and crystal orientation using Zn-based coordination polymer particles(Zn-CPP) as precursors. Using hydrothermal method, Zn-CPP with morphologies of microrod, nanoplate, flower-like, arrow-tipped microsheet, and square cylinder were successfully synthesized via the coordination between metal ions Zn2+ and organic ligand 1,4,5,8-naphthalenetetracarboxylic dianhydride in aqueous solution. Subsequent thermal treatment of the Zn-CPP successfully resulted in the formation of porous Zn O with similar morphology to Zn-CPP. It is also found that the Zn O with enhanced(002) orientation could be obtained from Zn-CPP with preferred(002) orientation. This strategy could be extended for the preparation of other metal oxides with desired shape and structure.
