A γ - type of layered zirconium hydrogen phosphate, Zr(HPO 4) 2·2H 2O( γ ZrP), was synthesized under hydrothermal conditions and characterized by powder X ray diffraction and thermogravimetric analysis....A γ - type of layered zirconium hydrogen phosphate, Zr(HPO 4) 2·2H 2O( γ ZrP), was synthesized under hydrothermal conditions and characterized by powder X ray diffraction and thermogravimetric analysis. The temperature dependence of the proton conductivity in γ ZrP was investigated in a temperature range of 23￣413 ℃ by ac impedance spectroscopy. The variation of the conductivity with water loss and phase transitions was observed. The best proton conductivity in γ ZrP is 6×10 -4 S·cm -1 at 60 ℃. The proton conductivities in the dehydrated sample are ￣10 -5 at 150 ℃ and ￣10 -4 S·cm -1 at 350 ℃, respectively. The conductivities as a function of humidity in the temperature range of 120￣200 ℃ were measured.展开更多
A series of aluminium-containing α-type hydrated zirconium hydrogen phosphates,Zr_(1-x)Alx (H_(1+x/2)PO_4 )_2 with x=0-0.06,were hydrothermally synthesized and characterizedby means of X-ray diffraction,differential ...A series of aluminium-containing α-type hydrated zirconium hydrogen phosphates,Zr_(1-x)Alx (H_(1+x/2)PO_4 )_2 with x=0-0.06,were hydrothermally synthesized and characterizedby means of X-ray diffraction,differential thermal analysis and thermogravimetric analysis.The proton conductivity,1.2×10￣(-4) S·cm￣(-1)at 180℃ was found in Zr_(0.98)Al_(0.02)(H_(1.01)PO_4)_2·H_2O.Humidity-sensing measurements were carried out at 120℃ and 140℃ respectively.Even a limited substitution of Al for Zr can enhance both proton conductivity and humidity sensitivity.展开更多
A new coordination polymer, {[Cd(OPY)(tdc)(HO)]·H2 O}n(OPY = 4,4?-(oxybis(4,1-phenylene))dipyridine, H2 tdc = thiophene-2,5-dicarboxylic acid), has been synthesized hydrothermally based on a V-shaped ligand OPY. ...A new coordination polymer, {[Cd(OPY)(tdc)(HO)]·H2 O}n(OPY = 4,4?-(oxybis(4,1-phenylene))dipyridine, H2 tdc = thiophene-2,5-dicarboxylic acid), has been synthesized hydrothermally based on a V-shaped ligand OPY. The structure was fully characterized by elemental analysis, FT-IR spectroscopy, and X-ray single-crystal diffraction analysis. In1, two OPY ligands and one water molecule acted as terminal ligands coordinating to Cdcation to form [Cd(OPY)HO]units, which are then linked by tdc2-ligands to generate a one-dimensional chain. Every two adjacent chains linked by extensive O–H···O hydrogen bonds constitute one-dimensional double-chains, and such chains are extended into two-dimensional layers via O–H···N hydrogen bonds. These layers are further connected to form a three-dimensional supramolecular architecture via π-π stacking interactions. In addition, the thermal stability and solid state fluorescence property of 1 were also investigated.展开更多
A new Zn（II） complex, [Zn（L）（IPP）（H2O）]＇2H2O（1, H2L = 3-carboxy-l-car- boxymethyl-2-oxidopyridinium and IPP = 2-（1H-imidazo[4,5-f][1,10]phenanthrolin-2-yl）phenol）, was synthesized under hydrothermal condi...A new Zn（II） complex, [Zn（L）（IPP）（H2O）]＇2H2O（1, H2L = 3-carboxy-l-car- boxymethyl-2-oxidopyridinium and IPP = 2-（1H-imidazo[4,5-f][1,10]phenanthrolin-2-yl）phenol）, was synthesized under hydrothermal conditions and its structure was determined by single-crystal X-ray diffraction. It crystallizes in triclinic, space group Pi with a = 8.5023（17）, b = 9.945（2）, c = 15.573（3） A, a = 95.87（3）, β = 102.56（3）, y = 100.73（3）°, V= 1248.7（4） A3, Z= 2, C27H22N5O9Zn, Mr= 625.87, Dc = 1.665 g/cm^3, F（000） = 642, μ（MoKa） = 1.053 mm^-1, R = 0.0474 and wR = 0.1352. In 1, one L2-, one 1PP and one water molecule coordinate to the same Zn（II） atom to give a discrete complex with two lattice water molecules. Adjacent [Zn（L）（IPP）（H20）].2H20 molecules interact through π-π stacking between two IPP ligands to form a supramolecular chain. The N-H…O and O-H…N hydrogen bonds further stabilize the supramolecular chain structure of 1. The solid state luminescent property of 1 was also studied.展开更多
Molecular structure of a naphthyridine and pyrazine amine ligand, N2,N7-di（pyrazin-2-yl）-1,8-naphthyri-dine-2,7-diamine（H2dpznda 1） was studied, and a three-dimensional supramolecular network with a double helix c...Molecular structure of a naphthyridine and pyrazine amine ligand, N2,N7-di（pyrazin-2-yl）-1,8-naphthyri-dine-2,7-diamine（H2dpznda 1） was studied, and a three-dimensional supramolecular network with a double helix chain structure through intermolecular hydrogen bonds and π-π interactions between the naphthyridine and pyrazine rings was depicted. Through ligand 1, [Co2（μ2-dpznda）2（μ2-CH3OH）2]（2） was obtained and two ligands coordinate to two Co2＋）as tetradentate bridging ligands. Single crystal and magnetism study on 2 revealed that the complex exhibited weak yet significant metal-metal interaction.展开更多
为了提高ZnSnO3的氢敏性能,以共沉淀法制备ZnSnO3并对其进行了贵金属Pd2+掺杂.采用X射线衍射仪(X-ray diffraction,XRD)及透射电镜(transmission electron microscopy,TEM)对制备的气敏材料进行结构及形貌表征,并使用静态配气法测试了...为了提高ZnSnO3的氢敏性能,以共沉淀法制备ZnSnO3并对其进行了贵金属Pd2+掺杂.采用X射线衍射仪(X-ray diffraction,XRD)及透射电镜(transmission electron microscopy,TEM)对制备的气敏材料进行结构及形貌表征,并使用静态配气法测试了掺杂前后ZnSnO3的氢敏性能.结果表明:掺杂Pd2+可显著提高ZnSnO3的氢敏性能.在工作温度为240℃、浓度为300×10-6的条件下,Pd2+掺杂纳米ZnSnO3对氢气的灵敏度为12,是未掺杂时的3倍.基于第一性原理探讨气敏机理,计算结果表明:Pd2+掺杂改变了ZnSnO3能带间的电子运动状态,使ZnSnO3费米能级由0.725 eV移动到1.035 eV,在费米能级附近产生新的电子峰,使其电导性能在气敏反应过程中改变更为明显.Pd2+掺杂还使ZnSnO3表面吸附氧的能力显著增加,对提高氢敏性能起到了关键作用.展开更多
A novel coordination polymer, namely [Zn2（CAPA）（DMA）（H2O）]2n·n（H2O）（1,H4CAPA = 5-（bis（4-carboxybenzyl） amino） isophthalic acid, DMA = N,N-dimethylacetamide） has been synthesized through a solvotherm...A novel coordination polymer, namely [Zn2（CAPA）（DMA）（H2O）]2n·n（H2O）（1,H4CAPA = 5-（bis（4-carboxybenzyl） amino） isophthalic acid, DMA = N,N-dimethylacetamide） has been synthesized through a solvothermal method and characterized by single-crystal X-ray diffraction, elemental analysis, infrared spectra, and thermogravimetric analyses. The crystal structure is of monoclinic, space group P21/n with a = 8.0585（5）, b = 18.9733（10）, c = 20.2044（14） A^°3, β = 101.144（7）°, V = 3030.9（3） ？~3, C56H54Zn4N4O21, Mr = 1378.58, Z = 2）. The compound forms a three-dimensional（3D） supramolecular framework by linking adjacent layers via hydrogen bonds and π···π interactions. It is interesting that the crystal structure is much related to the flexibility and configuration of the ligand. In addition, the thermal stability and luminescence properties for the compound have also been investigated.展开更多
The title complex,[Zn（ip）2（H2O）2][ZnCl4]·H2O·2DMF 1（ip=imidazo[4,5-f][1,10] phenanthroline）,has been synthesized via the slow evaporation of concentrated reaction solution at room temperature.It was ch...The title complex,[Zn（ip）2（H2O）2][ZnCl4]·H2O·2DMF 1（ip=imidazo[4,5-f][1,10] phenanthroline）,has been synthesized via the slow evaporation of concentrated reaction solution at room temperature.It was characterized by single-crystal X-ray diffraction.Crystal data for C32H36Cl4N10O5Zn2：white prism,0.17mm×0.15mm×0.10mm,monoclinic,space group P2/c,a=11.928（8）,b=9.868（6）,c=16.520（11）,β=104.879（12）°,V=1879（2）3,Z=2,Mr=913.25,Dc=1.614 g/cm3,F（000）=932,μ=1.616 mm-1,λ（MoKα）=0.71073,GOOF=1.045,R=0.0710 and wR=0.1755 for 3055 observed reflections with I 〉 2σ（I）. X-ray diffraction study reveals that the title complex has an interesting 3D architecture via hydrogen bonding interactions and π-π interactions. The IR, TGA, XRD and luminescent properties of complex 1 were also studied.展开更多
Linear bis-urea D230 series and branched tris-urea T403 series of supramolecular monomers were syn- thesized using low molecular weight polyetheramine D230, T403 and isocyanates with diverse functional groups. Rheolog...Linear bis-urea D230 series and branched tris-urea T403 series of supramolecular monomers were syn- thesized using low molecular weight polyetheramine D230, T403 and isocyanates with diverse functional groups. Rheological tests reveal that the materials possess special thermal and mechanical properties due to the strong hydrogen bonding interactions between terminal urea groups and the high flexibility of the polyetheramine middle segments. By enhancing the hydrogen bonding interactions through electronic effects of the substituted urea groups, the mechanical properties of the bulk material can be increased. Moreover, the branched T403 series with higher hy- drogen bonding density also shows better performance against D230 series with the same substituted urea groups. The presence of π-π stacking between the phenyl groups in samples with phenylurea residues, which complements the hydrogen bonding, was also confirmed by fluorescence spectroscopy, therefore resulting in a stronger supramolecular polymer network.展开更多
文摘A γ - type of layered zirconium hydrogen phosphate, Zr(HPO 4) 2·2H 2O( γ ZrP), was synthesized under hydrothermal conditions and characterized by powder X ray diffraction and thermogravimetric analysis. The temperature dependence of the proton conductivity in γ ZrP was investigated in a temperature range of 23￣413 ℃ by ac impedance spectroscopy. The variation of the conductivity with water loss and phase transitions was observed. The best proton conductivity in γ ZrP is 6×10 -4 S·cm -1 at 60 ℃. The proton conductivities in the dehydrated sample are ￣10 -5 at 150 ℃ and ￣10 -4 S·cm -1 at 350 ℃, respectively. The conductivities as a function of humidity in the temperature range of 120￣200 ℃ were measured.
文摘A series of aluminium-containing α-type hydrated zirconium hydrogen phosphates,Zr_(1-x)Alx (H_(1+x/2)PO_4 )_2 with x=0-0.06,were hydrothermally synthesized and characterizedby means of X-ray diffraction,differential thermal analysis and thermogravimetric analysis.The proton conductivity,1.2×10￣(-4) S·cm￣(-1)at 180℃ was found in Zr_(0.98)Al_(0.02)(H_(1.01)PO_4)_2·H_2O.Humidity-sensing measurements were carried out at 120℃ and 140℃ respectively.Even a limited substitution of Al for Zr can enhance both proton conductivity and humidity sensitivity.
基金Supported by the National Natural Science Foundation of China(Nos.21361023 and 21461023)
文摘A new coordination polymer, {[Cd(OPY)(tdc)(HO)]·H2 O}n(OPY = 4,4?-(oxybis(4,1-phenylene))dipyridine, H2 tdc = thiophene-2,5-dicarboxylic acid), has been synthesized hydrothermally based on a V-shaped ligand OPY. The structure was fully characterized by elemental analysis, FT-IR spectroscopy, and X-ray single-crystal diffraction analysis. In1, two OPY ligands and one water molecule acted as terminal ligands coordinating to Cdcation to form [Cd(OPY)HO]units, which are then linked by tdc2-ligands to generate a one-dimensional chain. Every two adjacent chains linked by extensive O–H···O hydrogen bonds constitute one-dimensional double-chains, and such chains are extended into two-dimensional layers via O–H···N hydrogen bonds. These layers are further connected to form a three-dimensional supramolecular architecture via π-π stacking interactions. In addition, the thermal stability and solid state fluorescence property of 1 were also investigated.
基金Supported by the Institute Foundation of Siping City(No.2013036)
文摘A new Zn（II） complex, [Zn（L）（IPP）（H2O）]＇2H2O（1, H2L = 3-carboxy-l-car- boxymethyl-2-oxidopyridinium and IPP = 2-（1H-imidazo[4,5-f][1,10]phenanthrolin-2-yl）phenol）, was synthesized under hydrothermal conditions and its structure was determined by single-crystal X-ray diffraction. It crystallizes in triclinic, space group Pi with a = 8.5023（17）, b = 9.945（2）, c = 15.573（3） A, a = 95.87（3）, β = 102.56（3）, y = 100.73（3）°, V= 1248.7（4） A3, Z= 2, C27H22N5O9Zn, Mr= 625.87, Dc = 1.665 g/cm^3, F（000） = 642, μ（MoKa） = 1.053 mm^-1, R = 0.0474 and wR = 0.1352. In 1, one L2-, one 1PP and one water molecule coordinate to the same Zn（II） atom to give a discrete complex with two lattice water molecules. Adjacent [Zn（L）（IPP）（H20）].2H20 molecules interact through π-π stacking between two IPP ligands to form a supramolecular chain. The N-H…O and O-H…N hydrogen bonds further stabilize the supramolecular chain structure of 1. The solid state luminescent property of 1 was also studied.
基金supported by the Natural Science Foundation of Shaanxi Province(No.2013JM2005)the National Science Council of China and the Full-Time Master Innovation Fund of Xi’an Shiyou University(No.2015cx140735)
文摘Molecular structure of a naphthyridine and pyrazine amine ligand, N2,N7-di（pyrazin-2-yl）-1,8-naphthyri-dine-2,7-diamine（H2dpznda 1） was studied, and a three-dimensional supramolecular network with a double helix chain structure through intermolecular hydrogen bonds and π-π interactions between the naphthyridine and pyrazine rings was depicted. Through ligand 1, [Co2（μ2-dpznda）2（μ2-CH3OH）2]（2） was obtained and two ligands coordinate to two Co2＋）as tetradentate bridging ligands. Single crystal and magnetism study on 2 revealed that the complex exhibited weak yet significant metal-metal interaction.
基金supported by the “Strategic Priority Research Program” of the Chinese Academy of Sciences(XDA07070200,XDA09030102)the Science Foundation of Fujian Province(2006l2005)
文摘A novel coordination polymer, namely [Zn2（CAPA）（DMA）（H2O）]2n·n（H2O）（1,H4CAPA = 5-（bis（4-carboxybenzyl） amino） isophthalic acid, DMA = N,N-dimethylacetamide） has been synthesized through a solvothermal method and characterized by single-crystal X-ray diffraction, elemental analysis, infrared spectra, and thermogravimetric analyses. The crystal structure is of monoclinic, space group P21/n with a = 8.0585（5）, b = 18.9733（10）, c = 20.2044（14） A^°3, β = 101.144（7）°, V = 3030.9（3） ？~3, C56H54Zn4N4O21, Mr = 1378.58, Z = 2）. The compound forms a three-dimensional（3D） supramolecular framework by linking adjacent layers via hydrogen bonds and π···π interactions. It is interesting that the crystal structure is much related to the flexibility and configuration of the ligand. In addition, the thermal stability and luminescence properties for the compound have also been investigated.
基金supported by 973 (2006CB932900)NNSFC (20571074)NSF of Fujian Province (2007J172)
文摘The title complex,[Zn（ip）2（H2O）2][ZnCl4]·H2O·2DMF 1（ip=imidazo[4,5-f][1,10] phenanthroline）,has been synthesized via the slow evaporation of concentrated reaction solution at room temperature.It was characterized by single-crystal X-ray diffraction.Crystal data for C32H36Cl4N10O5Zn2：white prism,0.17mm×0.15mm×0.10mm,monoclinic,space group P2/c,a=11.928（8）,b=9.868（6）,c=16.520（11）,β=104.879（12）°,V=1879（2）3,Z=2,Mr=913.25,Dc=1.614 g/cm3,F（000）=932,μ=1.616 mm-1,λ（MoKα）=0.71073,GOOF=1.045,R=0.0710 and wR=0.1755 for 3055 observed reflections with I 〉 2σ（I）. X-ray diffraction study reveals that the title complex has an interesting 3D architecture via hydrogen bonding interactions and π-π interactions. The IR, TGA, XRD and luminescent properties of complex 1 were also studied.
基金Supported by the National Natural Science Foundation of China（No.21574074）, the National Basic Research Program of China（No.2014CB932202） and the Fund of Key Laboratory of Advanced Materials of the Ministry of Education, China （No.2017AML08）.
文摘Linear bis-urea D230 series and branched tris-urea T403 series of supramolecular monomers were syn- thesized using low molecular weight polyetheramine D230, T403 and isocyanates with diverse functional groups. Rheological tests reveal that the materials possess special thermal and mechanical properties due to the strong hydrogen bonding interactions between terminal urea groups and the high flexibility of the polyetheramine middle segments. By enhancing the hydrogen bonding interactions through electronic effects of the substituted urea groups, the mechanical properties of the bulk material can be increased. Moreover, the branched T403 series with higher hy- drogen bonding density also shows better performance against D230 series with the same substituted urea groups. The presence of π-π stacking between the phenyl groups in samples with phenylurea residues, which complements the hydrogen bonding, was also confirmed by fluorescence spectroscopy, therefore resulting in a stronger supramolecular polymer network.
