A novel supramolecular structural inorganic-organic hybrid [（4-bromoanilimiun）（[18]crown-6）]3[PMo（12）O40]·CH3 CN has been synthesized through standard solvent evaporated method. The structure of the title c...A novel supramolecular structural inorganic-organic hybrid [（4-bromoanilimiun）（[18]crown-6）]3[PMo（12）O40]·CH3 CN has been synthesized through standard solvent evaporated method. The structure of the title compound was determined through single-crystal X-ray diffraction analysis. It crystallizes in monoclinic system with P21/n space group. The crystal data are a = 18.9529（4）, b = 26.4444（5）, c = 19.0985（4） A, β = 90.132（6）o, V = 9572.1（3） A^3, Z = 4, Dc= 2.203 g·cm^（–1）, μ = 14.956 mm^（–1）, F（000） = 6192, S = 1.098, the final R = 0.0859 and w R（I 〉 2σ（I）） = 0.2100. Supramolecular cations are constructed through strong N–H…O hydrogen bonding interaction between the six oxygen atoms of [18]crown-6 molecule and nitrogen atom of（4-bromoanilimiun） cation. Three kinds of different arranged supramolecular cations exist in the title compound, which are filled into the large space formed by [PMo（12）O40] polyoxoanions. Thermogravimentic differential thermal analysis revealed that hydrogen bonding interaction and intermolecular interaction play an important role in maintaining the stability of the title compound.展开更多
Lead(Ⅱ)(Pb2+)ions are toxic heavy metal ions that can accumulate in the human body through water and cause severe health problems,including neurotoxicity,nephrotoxicity,hematological toxicity and even genotoxicity ef...Lead(Ⅱ)(Pb2+)ions are toxic heavy metal ions that can accumulate in the human body through water and cause severe health problems,including neurotoxicity,nephrotoxicity,hematological toxicity and even genotoxicity effects.To remove Pb2+selectively and effectively from aqueous solutions,we develop a novel type of Pb2+-recognizable microgels with excellent adsorption capacity to Pb2+,which are fabri-cated from 4-acrylamidobenzo-18-crown-6(B18C6Am)and N-isopropylmethacrylamide(NIPMAM)monomers by precipitation copolymerization method.The prepared poly(N-isopropylmethacrylamide-co-4-acrylamidobenzo-18-crown-6)(PNMB)microgels exhibit expanded structures,because the electron-donating methyl groups atα-carbon could descend the polarity of C=O in the NIPMAM monomers and thus weaken the polymer segment…segment interactions.The expanded structures of PNMB microgels are beneficial for adsorption of Pb2+due to the low steric hindrance in the polymeric networks.The Pb2+adsorption isotherms of PNMB microgels are consistent with the Langmuir model for monolayer adsorption.The results indicate that the prepared Pb2+-recognizable PNMB microgels are highly promising for the selective removal of lead(Ⅱ)ions from aqueous solutions.展开更多
基金thank the foundation of Wuhan Textile University(No.165002)Hubei Key Laboratory of Biomass Fibers and Eco-dyeing&Finishing for supporting this work
文摘A novel supramolecular structural inorganic-organic hybrid [（4-bromoanilimiun）（[18]crown-6）]3[PMo（12）O40]·CH3 CN has been synthesized through standard solvent evaporated method. The structure of the title compound was determined through single-crystal X-ray diffraction analysis. It crystallizes in monoclinic system with P21/n space group. The crystal data are a = 18.9529（4）, b = 26.4444（5）, c = 19.0985（4） A, β = 90.132（6）o, V = 9572.1（3） A^3, Z = 4, Dc= 2.203 g·cm^（–1）, μ = 14.956 mm^（–1）, F（000） = 6192, S = 1.098, the final R = 0.0859 and w R（I 〉 2σ（I）） = 0.2100. Supramolecular cations are constructed through strong N–H…O hydrogen bonding interaction between the six oxygen atoms of [18]crown-6 molecule and nitrogen atom of（4-bromoanilimiun） cation. Three kinds of different arranged supramolecular cations exist in the title compound, which are filled into the large space formed by [PMo（12）O40] polyoxoanions. Thermogravimentic differential thermal analysis revealed that hydrogen bonding interaction and intermolecular interaction play an important role in maintaining the stability of the title compound.
基金support from the National Natural Science Foundation of China(grant Nos.21991101,22022810).
文摘Lead(Ⅱ)(Pb2+)ions are toxic heavy metal ions that can accumulate in the human body through water and cause severe health problems,including neurotoxicity,nephrotoxicity,hematological toxicity and even genotoxicity effects.To remove Pb2+selectively and effectively from aqueous solutions,we develop a novel type of Pb2+-recognizable microgels with excellent adsorption capacity to Pb2+,which are fabri-cated from 4-acrylamidobenzo-18-crown-6(B18C6Am)and N-isopropylmethacrylamide(NIPMAM)monomers by precipitation copolymerization method.The prepared poly(N-isopropylmethacrylamide-co-4-acrylamidobenzo-18-crown-6)(PNMB)microgels exhibit expanded structures,because the electron-donating methyl groups atα-carbon could descend the polarity of C=O in the NIPMAM monomers and thus weaken the polymer segment…segment interactions.The expanded structures of PNMB microgels are beneficial for adsorption of Pb2+due to the low steric hindrance in the polymeric networks.The Pb2+adsorption isotherms of PNMB microgels are consistent with the Langmuir model for monolayer adsorption.The results indicate that the prepared Pb2+-recognizable PNMB microgels are highly promising for the selective removal of lead(Ⅱ)ions from aqueous solutions.
