A process for in situ synthesis of terbium complex with salicylic acid by a two-step solgel method in silica matrix has been proposed. The luminescence properties of the silica gelscodoped with terbium and salicylic a...A process for in situ synthesis of terbium complex with salicylic acid by a two-step solgel method in silica matrix has been proposed. The luminescence properties of the silica gelscodoped with terbium and salicylic acid have also been discussed with respect to that of the geldoped with terbium and that of pure terbium complex with salicylic acid.展开更多
Nano-sized polyacrylonitrile （PAN） particles were prepared under the catalytic effect of in situ developed CoCl2/EDTA complex with ammonium persulfate as the initiator in the absence of any added emulsifier. The emu...Nano-sized polyacrylonitrile （PAN） particles were prepared under the catalytic effect of in situ developed CoCl2/EDTA complex with ammonium persulfate as the initiator in the absence of any added emulsifier. The emulsion polymerization was studied at varying concentrations of the initiator, monomer, complex and solvent over a temperature range of 30-70℃. The overall activation energy （Ea, 49.79 kJ/mol）, energy of dissociation of initiator （Ed, 82.68 kJ/mol）, number of micelles （0.163 × 10^18） and the viscosity average molecular weight of the polymer were computed. The distribution of particle sizes was determined by transmission electron microscopy （TEM）. It was found that the oil-in-water polymerization was stabilized by the presence of the CoCl2/EDTA in situ complex reducing the particle size into the nano order. The average diameters of PAN nano particles, obtained by TEM, were in the range of 50-150 nm at the maximum conversion. The experimental particle size was mainly dependent on the concentration of the complex and temperature.展开更多
One new polyoxometalate （POM）-based inorganic-organic hybrid [Cdn3~HPO4）（Hbpp）（H20）2]{CdII[P4_ Mo6028H3.s（OH）312}.（H4tpb）.7H20 （1） （bpp = 1,3-bis-（4-pyridyl）propane, tpb = 1,2,4,5-tetra（4-pyridyl）- b...One new polyoxometalate （POM）-based inorganic-organic hybrid [Cdn3~HPO4）（Hbpp）（H20）2]{CdII[P4_ Mo6028H3.s（OH）312}.（H4tpb）.7H20 （1） （bpp = 1,3-bis-（4-pyridyl）propane, tpb = 1,2,4,5-tetra（4-pyridyl）- benzene） constructed from reduced molybdophosphate [P4Mo6028H3.5（OH）3]s＇5- （P4Mo6）, trinuclear Cdn-phosphate-Hbpp fragment and protonated tpb has been hydrothermally synthesized and structurally characterized by IR, elemental analyses and single crystal X-ray diffraction. The complex 1 crystallizes in the monoclinic system with the space group P21]c and cell parameters of a=15.672（12）A, b=23.839（19）A, c=27.654（2）,~, fl=115.850（10）~, V=9297.9（12） ~3, Z=4, R1 ~0.0534 and wR2 ~0.1135. In complex 1, the P4Mo6 units are bridged by CdII ions to form the classic sandwich-type [Cd（P4Mo6）2] dimers, which are further connected into a two dimensional network via the trinuclear Cdn subunits. The tpb is synthesized in situ from the bpp ligands and connects the adjacent 2D layers into a 3D supramolecular framework through hydrogen bonding interactions. The electrochemical and fluorescent properties of complex 1 have been investigated.展开更多
文摘A process for in situ synthesis of terbium complex with salicylic acid by a two-step solgel method in silica matrix has been proposed. The luminescence properties of the silica gelscodoped with terbium and salicylic acid have also been discussed with respect to that of the geldoped with terbium and that of pure terbium complex with salicylic acid.
文摘Nano-sized polyacrylonitrile （PAN） particles were prepared under the catalytic effect of in situ developed CoCl2/EDTA complex with ammonium persulfate as the initiator in the absence of any added emulsifier. The emulsion polymerization was studied at varying concentrations of the initiator, monomer, complex and solvent over a temperature range of 30-70℃. The overall activation energy （Ea, 49.79 kJ/mol）, energy of dissociation of initiator （Ed, 82.68 kJ/mol）, number of micelles （0.163 × 10^18） and the viscosity average molecular weight of the polymer were computed. The distribution of particle sizes was determined by transmission electron microscopy （TEM）. It was found that the oil-in-water polymerization was stabilized by the presence of the CoCl2/EDTA in situ complex reducing the particle size into the nano order. The average diameters of PAN nano particles, obtained by TEM, were in the range of 50-150 nm at the maximum conversion. The experimental particle size was mainly dependent on the concentration of the complex and temperature.
基金Financial supports of this research by the National Natural Science Foundation of China(Nos.21171025 and 21101015)New Century Excellent Talents in University(No.NCET-09-0853)+1 种基金Natural Science Foundation of Liaoning Province(No.201102003)Program of Innovative Research Team in University of Liaoning Province(No.LT2012020)
文摘One new polyoxometalate （POM）-based inorganic-organic hybrid [Cdn3~HPO4）（Hbpp）（H20）2]{CdII[P4_ Mo6028H3.s（OH）312}.（H4tpb）.7H20 （1） （bpp = 1,3-bis-（4-pyridyl）propane, tpb = 1,2,4,5-tetra（4-pyridyl）- benzene） constructed from reduced molybdophosphate [P4Mo6028H3.5（OH）3]s＇5- （P4Mo6）, trinuclear Cdn-phosphate-Hbpp fragment and protonated tpb has been hydrothermally synthesized and structurally characterized by IR, elemental analyses and single crystal X-ray diffraction. The complex 1 crystallizes in the monoclinic system with the space group P21]c and cell parameters of a=15.672（12）A, b=23.839（19）A, c=27.654（2）,~, fl=115.850（10）~, V=9297.9（12） ~3, Z=4, R1 ~0.0534 and wR2 ~0.1135. In complex 1, the P4Mo6 units are bridged by CdII ions to form the classic sandwich-type [Cd（P4Mo6）2] dimers, which are further connected into a two dimensional network via the trinuclear Cdn subunits. The tpb is synthesized in situ from the bpp ligands and connects the adjacent 2D layers into a 3D supramolecular framework through hydrogen bonding interactions. The electrochemical and fluorescent properties of complex 1 have been investigated.
