Meihua brand supermolecute polyethylene, a product of the Beijing No.2 Assistant Factory, is a chemically resistant thermoplastic for industrial use, grinding, and punching. With a low friction coefficient, it is good...Meihua brand supermolecute polyethylene, a product of the Beijing No.2 Assistant Factory, is a chemically resistant thermoplastic for industrial use, grinding, and punching. With a low friction coefficient, it is good in lubrication and insulauon situations and can be used at under -269 C in liquid展开更多
A novel praseodymium complex [PrCl(H_2O)_3(L)(HL)]_nnCl(1, HL = 3-hydroxy-2-methylquinoline-4-carboxylic acid) has been synthesized through hydrothermal reactions and characterized by single-crystal X-ray diffraction....A novel praseodymium complex [PrCl(H_2O)_3(L)(HL)]_nnCl(1, HL = 3-hydroxy-2-methylquinoline-4-carboxylic acid) has been synthesized through hydrothermal reactions and characterized by single-crystal X-ray diffraction. Complex 1 crystallizes in P2_1 space group of the monoclinic system, with a = 7.3146(2), b = 9.3963(3), c = 17.4872(5) ?, β = 96.818(3)°, V = 1193.40(6) ?~3, C_(22)H_(23)Cl_2N_2O_9Pr, M_r = 671.23, Z = 2, D_c = 1.868 g/cm^3, μ(MoKα) = 2.322 mm^(-1) and F(000) = 668. The praseodymium ion is surrounded by seven oxygen atoms and one chlorine atom to yield a slightly distorted square antiprism. Complex 1 is characterized by a one-dimensional chain-like structure. A two-dimensional supramolecular layer is formed via hydrogen-bonding interactions. Solid-state photoluminescence spectrum reveals that it shows red emission. The emission bands are ascribed to the characteristic emission of the 4 f electron transitions of ~3P_0 → ~3H_J(J = 5 and 6) and ~3P_0 → ~3F_4 of Pr^(3+) ions. Solid-state UV/Vis diffuse reflectance spectroscopy exhibits that it has an optical band gap of 2.75 eV.展开更多
A hydrogen-bonded supermolecular compound [（C6H5N2O）3·Cu1.5]·6H2O was synthesized from picolinamide and Cu（NO3）2·6H2O at the presence of sodium pyrophosphate decahydrate. It crystallizes in triclini...A hydrogen-bonded supermolecular compound [（C6H5N2O）3·Cu1.5]·6H2O was synthesized from picolinamide and Cu（NO3）2·6H2O at the presence of sodium pyrophosphate decahydrate. It crystallizes in triclinic, space group P1^- with a = 1.05947（8）, b = 1.09130（8）, c = 1.11456（8） nm, a = 67.8460（10）, β= 84.497（1）, γ = 74.6210（10）°, C18H27Cu1.5N6O9, Mr = 566.77, V = 1.15077（15） nm^3, Z = 2, Dc = 1.636 g/cm^3, F（000） = 585,μ= 1.461 mm^-1, R1 = 0.0278 and wR2 = 0.0749. In the complex, the Cu（Ⅱ） ion reveals a distorted tetradentate plane-tetragonal geometry. The structure consists of neutral two-dimensional layers via hydrogen bonds O-H...O and N-H...O between the molecules, and the layers are connected by weak interactions of the Cu-Cu, Cu-N, π-π and hydrogen bonds to form a three-dimensional network structure.展开更多
A tetranuclear complex [Co(III)(2)(L)(2)(AcO)(2)(OH)](AcO)(2I). 4H(2)O (L = N-ferrocenylmethyl-1,4,7-triaza-cyclononane) was prepared from ligand L . HI and its crystal structure was determined. The crystal exists in ...A tetranuclear complex [Co(III)(2)(L)(2)(AcO)(2)(OH)](AcO)(2I). 4H(2)O (L = N-ferrocenylmethyl-1,4,7-triaza-cyclononane) was prepared from ligand L . HI and its crystal structure was determined. The crystal exists in P2(1)(/)a space group and its cell parameters are a = 14.285(3)Angstrom, b = 19.888(3)Angstrom, c = 19.133(3)Angstrom; beta = 109.12(2)degrees; V = 5135.8 Angstrom(3); Z = 4. Electrochemical investigation reveals that the oxidation potential of ferrocenyl group in 1 has a 0.11V-positive-shift from that of the ferrocenyl group in L.HI.展开更多
The rapid deactivation of cost-effective MnO_(2)-based catalysts in humid air limits their application in practice,and the identification of the role of water in an oxidation process is significant for developing wate...The rapid deactivation of cost-effective MnO_(2)-based catalysts in humid air limits their application in practice,and the identification of the role of water in an oxidation process is significant for developing water-resistant MnO_(2)-based catalysts.Here,CuMnO_(2)showed a20.3%HCHO conversion in 10 hr at room temperature in humid air with relative humidity of 40%,but deactivated in 3 hr in dry air.The excellent activity and stability of HCHO oxidation in humid air were attributed to the positive effect of H_(2)O on HCHO oxidation to the H_(2)O-HOCH_(2)OH supermolecule assemblies via hydrogen bonds formed on CuMnO_(2).H_(2)O-HOCH_(2)OH supermolecule assemblies tend to be oxidized to carbonate,which is further oxidized to CO_(2).Furthermore,CuMnO_(2)exhibited a much poorer activity of CO oxidation in humid air,but the CO conversion was still 100%in 10 hr in dry air.H_(2)O showed a competitive adsorption effect to CO on CuMnO_(2).CuMnO_(2)could be applied in HCHO elimination in humid air and CO elimination in dry air.展开更多
Metal-free room-temperature phosphorescence(RTP)materials have the characteristics of large Stokes shift,long lifetime,and triplet state transition.They exhibit application potential in various fields,such as bioimagi...Metal-free room-temperature phosphorescence(RTP)materials have the characteristics of large Stokes shift,long lifetime,and triplet state transition.They exhibit application potential in various fields,such as bioimaging,computer display,sensor,and anticounterfeiting and have drawn much research interest.Recent work showed that manipulating intermolecular interactions(e.g.,crystallization,polymerization,and rigid matrix)and host-guest assembly to restrain nonradiative transitions and isolate phosphor from oxygen as much as possible is a feasible way to obtain various types of efficient RTP materials.In some cases,intermolecular interactions also facilitated RTP emission by regulating the triplet state.On the other hand,heavy atoms(Br,I,etc.),heteroatoms(N,O,S,etc.),or carbonyls were introduced to the molecular skeleton through molecular engineering to enhance intersystem crossing,which is important for populating the triplet exciton.By comprehensively using the aforesaid strategies,great progress has been made for RTP materials.In this mini-review,we summarized recent advances in organic RTP materials based on manipulating intermolecular interactions.Typical host-guest assembly,hydrogen-bond assembly,energy transfer process,and exciplex emission system-based RTP materials were well illustrated.In summary,the current challenges and prospects for development in this field were presented.展开更多
Research progresses in the layered double hydroxides [M2+(1-x)M3+x(OH)2]x+An-x/n.mH2O intercalatedwith metal coordinate ions or oxometalates in the last ten years are reviewed. These layered double hydroxides are main...Research progresses in the layered double hydroxides [M2+(1-x)M3+x(OH)2]x+An-x/n.mH2O intercalatedwith metal coordinate ions or oxometalates in the last ten years are reviewed. These layered double hydroxides are mainly intercalated with polyoxometalate (POM) ions, a LiAl-LDH photochemical assembly containing TiO2 and CH3(CH2)12COO- anions, together with Zn(TPPC) (porphy-rin derivate) and macrocyclic ligand-containing porphyrin derivate anions. Emphasis is put on the synthesis methods for intercalation of the anions into the interlayer regions, the characterization techniques and structures for the layeredcompounds and the newest research progress in the fields such as catalysis. The review also forecasts the prospects of the field.展开更多
Until now, to remove the harmful organic dyes from effluents is an outstanding challenge. The design and synthesis of new porous materials capable of selectively adsorbing dyes are critical to the environment and huma...Until now, to remove the harmful organic dyes from effluents is an outstanding challenge. The design and synthesis of new porous materials capable of selectively adsorbing dyes are critical to the environment and human health. Here, a unique cluster-based cationic metal-organic framework, named{[Zn8（BTA）6（L）5Cl2]·（NO3）3}·5 DMF（NUM-4） was synthesized, which displays one-dimensional（1 D）open channels along a axis in its 3 D supramolecular stacking structure. Benefiting from the nature of cationic framework and high surface area/pore volume, NUM-4 shows rapid and selective adsorption of anionic dyes（MO, AO, CR and MB） based on the charge-exclusive effect. Besides, the adsorbed dyes can be easily released in NH4Cl saturated solution of ethanol.展开更多
The supramolecular inclusion compound of β-cyclodextrin (β-CD, host) with (η5-cyclopentadienyl)tricarbonylmanganese [MnCp(CO)3, guest] was obtained in a crystalline state. The host-guest compound is thermally stabl...The supramolecular inclusion compound of β-cyclodextrin (β-CD, host) with (η5-cyclopentadienyl)tricarbonylmanganese [MnCp(CO)3, guest] was obtained in a crystalline state. The host-guest compound is thermally stable and do not liberate the guest on heating at 100$ in vacuum. It was characteried by elemental analysis,1H NMR, differential scanning thermal (DSC) analysis and TLC. Continueous variation plot by NMR method shows that β-CD formed 1:1 inclusion compound with MnCp(CO)3. On the basis of 1H NMR spectra and the model building with Corey Pauling Koltum (CPK) models, the most probable inclusion mode is proposed.展开更多
A {NIT] cluster-substituted sandwich-type phosphotungstate Na10（NH4）4[{（B-a-PW9034）Ni3 （OH）（H20）2（HAle））2Ni].22H20 （1） was synthesized using the conventional aqueous solution method. Compound 1 represents...A {NIT] cluster-substituted sandwich-type phosphotungstate Na10（NH4）4[{（B-a-PW9034）Ni3 （OH）（H20）2（HAle））2Ni].22H20 （1） was synthesized using the conventional aqueous solution method. Compound 1 represents the first nickel-containing sandwich-type polyoxometalate functionalized by bisphosphonate ligands. Further, the sandwich-type polyoxoanions aggregated via the H-bonding interactions into a two-dimensional （2D） suoramolecular framewnrk.展开更多
How to regulate the supramolecular structures in the assembly of graphene quantum dots(GQDs)is still a great challenge to be overcome.Herein,the GQDs of 1-3 layers with high quality are synthesized from the new precur...How to regulate the supramolecular structures in the assembly of graphene quantum dots(GQDs)is still a great challenge to be overcome.Herein,the GQDs of 1-3 layers with high quality are synthesized from the new precursor m-trihydroxybenzene in a green method.More importantly,a strategy for designing the supramolecular structures of GQDs is demonstrated,and the novel supramolecular morphologies of GQDs have been constructed for the first time.Moreover,the supramolecular morphologies of GQDs can be well controlled by regulating the preparation conditions,and the formation mechanism of the branch-like supramolecular structure has been explained by the the diffusion-limited aggregation(DLA)model.This work not only develops a new precoursor to synthesize GQDs,but also opens up an effective route toform the polymorphic supermolecules,thus greatly facilitating their potential applications.展开更多
文摘Meihua brand supermolecute polyethylene, a product of the Beijing No.2 Assistant Factory, is a chemically resistant thermoplastic for industrial use, grinding, and punching. With a low friction coefficient, it is good in lubrication and insulauon situations and can be used at under -269 C in liquid
基金supported by the NNSFC(51363009,21764007)Jiangxi Provincial Department of Education’s Item of Science and Technology(GJJ160745 and GJJ151217)
文摘A novel praseodymium complex [PrCl(H_2O)_3(L)(HL)]_nnCl(1, HL = 3-hydroxy-2-methylquinoline-4-carboxylic acid) has been synthesized through hydrothermal reactions and characterized by single-crystal X-ray diffraction. Complex 1 crystallizes in P2_1 space group of the monoclinic system, with a = 7.3146(2), b = 9.3963(3), c = 17.4872(5) ?, β = 96.818(3)°, V = 1193.40(6) ?~3, C_(22)H_(23)Cl_2N_2O_9Pr, M_r = 671.23, Z = 2, D_c = 1.868 g/cm^3, μ(MoKα) = 2.322 mm^(-1) and F(000) = 668. The praseodymium ion is surrounded by seven oxygen atoms and one chlorine atom to yield a slightly distorted square antiprism. Complex 1 is characterized by a one-dimensional chain-like structure. A two-dimensional supramolecular layer is formed via hydrogen-bonding interactions. Solid-state photoluminescence spectrum reveals that it shows red emission. The emission bands are ascribed to the characteristic emission of the 4 f electron transitions of ~3P_0 → ~3H_J(J = 5 and 6) and ~3P_0 → ~3F_4 of Pr^(3+) ions. Solid-state UV/Vis diffuse reflectance spectroscopy exhibits that it has an optical band gap of 2.75 eV.
文摘A hydrogen-bonded supermolecular compound [（C6H5N2O）3·Cu1.5]·6H2O was synthesized from picolinamide and Cu（NO3）2·6H2O at the presence of sodium pyrophosphate decahydrate. It crystallizes in triclinic, space group P1^- with a = 1.05947（8）, b = 1.09130（8）, c = 1.11456（8） nm, a = 67.8460（10）, β= 84.497（1）, γ = 74.6210（10）°, C18H27Cu1.5N6O9, Mr = 566.77, V = 1.15077（15） nm^3, Z = 2, Dc = 1.636 g/cm^3, F（000） = 585,μ= 1.461 mm^-1, R1 = 0.0278 and wR2 = 0.0749. In the complex, the Cu（Ⅱ） ion reveals a distorted tetradentate plane-tetragonal geometry. The structure consists of neutral two-dimensional layers via hydrogen bonds O-H...O and N-H...O between the molecules, and the layers are connected by weak interactions of the Cu-Cu, Cu-N, π-π and hydrogen bonds to form a three-dimensional network structure.
文摘A tetranuclear complex [Co(III)(2)(L)(2)(AcO)(2)(OH)](AcO)(2I). 4H(2)O (L = N-ferrocenylmethyl-1,4,7-triaza-cyclononane) was prepared from ligand L . HI and its crystal structure was determined. The crystal exists in P2(1)(/)a space group and its cell parameters are a = 14.285(3)Angstrom, b = 19.888(3)Angstrom, c = 19.133(3)Angstrom; beta = 109.12(2)degrees; V = 5135.8 Angstrom(3); Z = 4. Electrochemical investigation reveals that the oxidation potential of ferrocenyl group in 1 has a 0.11V-positive-shift from that of the ferrocenyl group in L.HI.
基金supported by the National Natural Science Foundation of China (Nos. 21976198 and 21777175)the National Key Research and Development Program of China (No. 2018YFA0901200)。
文摘The rapid deactivation of cost-effective MnO_(2)-based catalysts in humid air limits their application in practice,and the identification of the role of water in an oxidation process is significant for developing water-resistant MnO_(2)-based catalysts.Here,CuMnO_(2)showed a20.3%HCHO conversion in 10 hr at room temperature in humid air with relative humidity of 40%,but deactivated in 3 hr in dry air.The excellent activity and stability of HCHO oxidation in humid air were attributed to the positive effect of H_(2)O on HCHO oxidation to the H_(2)O-HOCH_(2)OH supermolecule assemblies via hydrogen bonds formed on CuMnO_(2).H_(2)O-HOCH_(2)OH supermolecule assemblies tend to be oxidized to carbonate,which is further oxidized to CO_(2).Furthermore,CuMnO_(2)exhibited a much poorer activity of CO oxidation in humid air,but the CO conversion was still 100%in 10 hr in dry air.H_(2)O showed a competitive adsorption effect to CO on CuMnO_(2).CuMnO_(2)could be applied in HCHO elimination in humid air and CO elimination in dry air.
基金supported by the National Natural Science Foundation of China(21788102,22125803,22020102006,21871083)Shanghai Municipal Science and Technology Major Project(2018SHZDZX03)+3 种基金the Program of Shanghai Academic/Technology Research Leader(20XD1421300)the“Shu Guang”Project supported by Shanghai Municipal Education Commission and Shanghai Education Development Foundation(19SG26)the Fundamental Research Funds for the Central Universitiesthe China National Postdoctoral Program for Innovative Talents(BX20220106)。
文摘Metal-free room-temperature phosphorescence(RTP)materials have the characteristics of large Stokes shift,long lifetime,and triplet state transition.They exhibit application potential in various fields,such as bioimaging,computer display,sensor,and anticounterfeiting and have drawn much research interest.Recent work showed that manipulating intermolecular interactions(e.g.,crystallization,polymerization,and rigid matrix)and host-guest assembly to restrain nonradiative transitions and isolate phosphor from oxygen as much as possible is a feasible way to obtain various types of efficient RTP materials.In some cases,intermolecular interactions also facilitated RTP emission by regulating the triplet state.On the other hand,heavy atoms(Br,I,etc.),heteroatoms(N,O,S,etc.),or carbonyls were introduced to the molecular skeleton through molecular engineering to enhance intersystem crossing,which is important for populating the triplet exciton.By comprehensively using the aforesaid strategies,great progress has been made for RTP materials.In this mini-review,we summarized recent advances in organic RTP materials based on manipulating intermolecular interactions.Typical host-guest assembly,hydrogen-bond assembly,energy transfer process,and exciplex emission system-based RTP materials were well illustrated.In summary,the current challenges and prospects for development in this field were presented.
基金This work was supported by the National Natural Science Foundation of China (Grant No. 20071007)and the Foundation for University Key Teachers by the Ministry of Education of China.
文摘Research progresses in the layered double hydroxides [M2+(1-x)M3+x(OH)2]x+An-x/n.mH2O intercalatedwith metal coordinate ions or oxometalates in the last ten years are reviewed. These layered double hydroxides are mainly intercalated with polyoxometalate (POM) ions, a LiAl-LDH photochemical assembly containing TiO2 and CH3(CH2)12COO- anions, together with Zn(TPPC) (porphy-rin derivate) and macrocyclic ligand-containing porphyrin derivate anions. Emphasis is put on the synthesis methods for intercalation of the anions into the interlayer regions, the characterization techniques and structures for the layeredcompounds and the newest research progress in the fields such as catalysis. The review also forecasts the prospects of the field.
基金financially supported by the National Natural Science Foundation of China (Nos. 21371102, 21531005 and 21673120)the Natural Science Foundation of Tianjin (Nos. 16JCZDJC36900 and 15JCZDJC38800)
文摘Until now, to remove the harmful organic dyes from effluents is an outstanding challenge. The design and synthesis of new porous materials capable of selectively adsorbing dyes are critical to the environment and human health. Here, a unique cluster-based cationic metal-organic framework, named{[Zn8（BTA）6（L）5Cl2]·（NO3）3}·5 DMF（NUM-4） was synthesized, which displays one-dimensional（1 D）open channels along a axis in its 3 D supramolecular stacking structure. Benefiting from the nature of cationic framework and high surface area/pore volume, NUM-4 shows rapid and selective adsorption of anionic dyes（MO, AO, CR and MB） based on the charge-exclusive effect. Besides, the adsorbed dyes can be easily released in NH4Cl saturated solution of ethanol.
基金Project supported by the State Science and Technology Commission of China,and the National Science Foundation of China.
文摘The supramolecular inclusion compound of β-cyclodextrin (β-CD, host) with (η5-cyclopentadienyl)tricarbonylmanganese [MnCp(CO)3, guest] was obtained in a crystalline state. The host-guest compound is thermally stable and do not liberate the guest on heating at 100$ in vacuum. It was characteried by elemental analysis,1H NMR, differential scanning thermal (DSC) analysis and TLC. Continueous variation plot by NMR method shows that β-CD formed 1:1 inclusion compound with MnCp(CO)3. On the basis of 1H NMR spectra and the model building with Corey Pauling Koltum (CPK) models, the most probable inclusion mode is proposed.
基金supported by the National Natural Science Foundation of China(No.21101022)Fundamental Research Funds for the Central Universities(No.10QNJJ009)
文摘A {NIT] cluster-substituted sandwich-type phosphotungstate Na10（NH4）4[{（B-a-PW9034）Ni3 （OH）（H20）2（HAle））2Ni].22H20 （1） was synthesized using the conventional aqueous solution method. Compound 1 represents the first nickel-containing sandwich-type polyoxometalate functionalized by bisphosphonate ligands. Further, the sandwich-type polyoxoanions aggregated via the H-bonding interactions into a two-dimensional （2D） suoramolecular framewnrk.
基金the work from the National Natural Science Foundation of China(No.21805166)the 111 Project of Hubei Province(No.D20015)Foundation of Science and Technology Bureau of Yichang City(No.A18-302-a07).
文摘How to regulate the supramolecular structures in the assembly of graphene quantum dots(GQDs)is still a great challenge to be overcome.Herein,the GQDs of 1-3 layers with high quality are synthesized from the new precursor m-trihydroxybenzene in a green method.More importantly,a strategy for designing the supramolecular structures of GQDs is demonstrated,and the novel supramolecular morphologies of GQDs have been constructed for the first time.Moreover,the supramolecular morphologies of GQDs can be well controlled by regulating the preparation conditions,and the formation mechanism of the branch-like supramolecular structure has been explained by the the diffusion-limited aggregation(DLA)model.This work not only develops a new precoursor to synthesize GQDs,but also opens up an effective route toform the polymorphic supermolecules,thus greatly facilitating their potential applications.
