The hexagonal silica mesoporous material SBA-15 with ordered 2-dimensional channel structure was used as a suppport to the immobilization of emzyme. α-Chymotrypsin, an enzyme, was assembled in the channel of SBA-15 b...
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The hexagonal silica mesoporous material SBA-15 with ordered 2-dimensional channel structure was used as a suppport to the immobilization of emzyme. α-Chymotrypsin, an enzyme, was assembled in the channel of SBA-15 by immersion method. The absorbed amount of enzyme in SBA-15 and the activity of the immobilized enzyme were studied. It was found that there was more absorbed enzyme in SBA-15 than in other carrier and the activity of the immobilized α-chymotrypsin was increased compared with the free enzyme. It suggests that silica mesoporous material SBA-15 is a good support for immobilization of enzyme.
The synthesis and properties of a novel room-temperature ionic liquid hexaalkylguanidium salts 4 and 5 were reported. The reaction of 1,3-dimethyl-2-imidazolidinon with POCl 3 and n-BuNH 2 afforded to pentaalkyl-guani...
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The synthesis and properties of a novel room-temperature ionic liquid hexaalkylguanidium salts 4 and 5 were reported. The reaction of 1,3-dimethyl-2-imidazolidinon with POCl 3 and n-BuNH 2 afforded to pentaalkyl-guanidine(2), which reacted with CH 3I, generated hexaalkylguanidium(3). The hexaalkylguanidium salts 4 and 5 were synthesized by the reaction of hexaalkylguanidium(3) with KPF 6, AgBF 4 respectively. The results showed that both compounds 4 and 5 were room-temperature ionic liquids. The structures of these compounds were determined by 1H NMR, 13C NMR, IR and MS spectra data. Compounds 4 and 5 were found to have better solublities in organic solvents and better thermal stabilities.
A new Co 2(HPO 4) 2·H 2O has been hydrothermally synthesized firstly. Single crystal X-ray analysis indicates that this compound crystallizes in a hexagonal system, space group P6 5 with a=1.048 31(15) nm, b=1.04...
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A new Co 2(HPO 4) 2·H 2O has been hydrothermally synthesized firstly. Single crystal X-ray analysis indicates that this compound crystallizes in a hexagonal system, space group P6 5 with a=1.048 31(15) nm, b=1.048 31(15) nm, c=1.496 3(3) nm, α=90°, β=90°, γ=120°, V= 1.424 1(4) nm 3, μ=3.849 mm -1, Z=6, F(000)=960, D c=2.294 g/cm 3, R=0.072 1, wR= 0.212 1, S=1.182, Δρ max=1.671×10 3 e·nm -3 and (Δρ) min=-1.210×10 3 e·nm -3. Co 2(HPO 4) 2·H 2O is characterized by 1D 12-ring helical channels. Tetrahedral primary structure-building units of CoO 4 and PO 4 indicates the title compound has a zeotype framework.
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