The title complex was synthesized by reaction of 2,2′-bipyridine(bipy) and zinc sulfate heptahrdrate in water-methanol solution.The crystal structure was determined by elemental analysis and X-ray diffraction.The res...The title complex was synthesized by reaction of 2,2′-bipyridine(bipy) and zinc sulfate heptahrdrate in water-methanol solution.The crystal structure was determined by elemental analysis and X-ray diffraction.The results show that the title complex belongs to monoclinic system with space group Cc and cell parameter: a = 1.5420(2) nm,b = 1.2696(2) nm,c = 0.6704(1) nm.β= 102.178(2)°.V = 1.2830(3) nm3,Z = 4,Dc = 1.831 g/cm3,μ= 2.104 mm-1,F(000) = 720.The Zn(Ⅱ) is coordinated by one bipy,two water molecules and one SO42-.At the same time,the Zn(Ⅱ) formed a distorted tetrasquare pyramid structure.The complex formed 1D straight chain by SO42-anion,and 1D chain assembled into double-stranded chain by π-π stacking interactions(ca:0.335(1) nm),furthmore,double-stranded chain extended to 2D network by O-H…O hrdrogen bonds,2D network constructed 3D supramolecular structure by C-H…O hrdrogen bonds.展开更多
Pure zinc blende structure GaAs/AlGaAs axial heterostructure nanowires （NWs） are grown by metal organic chemical vapor deposition on GaAs（111） B substrates using Au-catalyzed vapor-liquid-solid mechanism. Al adato...Pure zinc blende structure GaAs/AlGaAs axial heterostructure nanowires （NWs） are grown by metal organic chemical vapor deposition on GaAs（111） B substrates using Au-catalyzed vapor-liquid-solid mechanism. Al adatom enhances the influence of diameters on NWs growth rate. NWs are grown mainly through the contributions from the direct impingement of the precursors onto the alloy droplets and not so much from adatom diffusion. The results indicate that the droplet acts as a catalyst rather than an adatom collector.展开更多
A novel complex [Zn（FcCOO）2（2,2＇-bipy）（H2O）]2-H2O （Fc = （η^5-C5H5）Fe（η^5-CsH4）, 2,2＇-bipy = 2,2＇-bipyridine） has been synthesized and characterized by elemental analysis, IR and X-ray diffraction. It ...A novel complex [Zn（FcCOO）2（2,2＇-bipy）（H2O）]2-H2O （Fc = （η^5-C5H5）Fe（η^5-CsH4）, 2,2＇-bipy = 2,2＇-bipyridine） has been synthesized and characterized by elemental analysis, IR and X-ray diffraction. It crystallizes in monoclinic system, space group P21/c with a = 6.8187（4）, b = 21.7155（13）, c = 19.7411（12） A, a = 90, β = 97.7420（10）, γ = 90°, CtaHssFe4Zn2N4O11, Mr = 1413.28, V = 2896.4（3）A^3, Dc = 1.620 g/cm^3, Z = 2, F（000） = 1444,μ（MoKa） = 1.857 mm^-1, R = 0.0523 and wR = 0.0982 for 3219 observed reflections （I 〉 2σ（I））. Structural analysis shows that the zinc atom is coordinated with three oxygen atoms from two ferrocenemonocarboxylates and one water molecule together with two nitrogen atoms from 2,2＇-bipyridine, giving a distorted square-pyramidal coordination geometry. The complex molecules are linked to form an infinite one-dimensional chain by both intermolecular hydrogen bonds and π-π stacking interactions of the bipyridine rings.展开更多
文摘The title complex was synthesized by reaction of 2,2′-bipyridine(bipy) and zinc sulfate heptahrdrate in water-methanol solution.The crystal structure was determined by elemental analysis and X-ray diffraction.The results show that the title complex belongs to monoclinic system with space group Cc and cell parameter: a = 1.5420(2) nm,b = 1.2696(2) nm,c = 0.6704(1) nm.β= 102.178(2)°.V = 1.2830(3) nm3,Z = 4,Dc = 1.831 g/cm3,μ= 2.104 mm-1,F(000) = 720.The Zn(Ⅱ) is coordinated by one bipy,two water molecules and one SO42-.At the same time,the Zn(Ⅱ) formed a distorted tetrasquare pyramid structure.The complex formed 1D straight chain by SO42-anion,and 1D chain assembled into double-stranded chain by π-π stacking interactions(ca:0.335(1) nm),furthmore,double-stranded chain extended to 2D network by O-H…O hrdrogen bonds,2D network constructed 3D supramolecular structure by C-H…O hrdrogen bonds.
基金supported by the National Basic Research Program of China (No. 2010CB327600)the National High Technology R&D Program of China (No. 2009AA03Z417)+3 种基金the National Natural Science Foundation of China (No. 61020106007)the Program for New Century Excellent Talents in University of Ministry of Education of China (NCET-08-0736)the Chinese Universities' Scientific Fund (BUPT2009RC0409, BUPT2009RC0410)the 111 Program of China (No. B07005)
文摘Pure zinc blende structure GaAs/AlGaAs axial heterostructure nanowires （NWs） are grown by metal organic chemical vapor deposition on GaAs（111） B substrates using Au-catalyzed vapor-liquid-solid mechanism. Al adatom enhances the influence of diameters on NWs growth rate. NWs are grown mainly through the contributions from the direct impingement of the precursors onto the alloy droplets and not so much from adatom diffusion. The results indicate that the droplet acts as a catalyst rather than an adatom collector.
基金Project supported by the National Natural Science Foundation of China (No. 20461001) the Research Fund of Shangrao Normal College (No. 0607)
文摘A novel complex [Zn（FcCOO）2（2,2＇-bipy）（H2O）]2-H2O （Fc = （η^5-C5H5）Fe（η^5-CsH4）, 2,2＇-bipy = 2,2＇-bipyridine） has been synthesized and characterized by elemental analysis, IR and X-ray diffraction. It crystallizes in monoclinic system, space group P21/c with a = 6.8187（4）, b = 21.7155（13）, c = 19.7411（12） A, a = 90, β = 97.7420（10）, γ = 90°, CtaHssFe4Zn2N4O11, Mr = 1413.28, V = 2896.4（3）A^3, Dc = 1.620 g/cm^3, Z = 2, F（000） = 1444,μ（MoKa） = 1.857 mm^-1, R = 0.0523 and wR = 0.0982 for 3219 observed reflections （I 〉 2σ（I））. Structural analysis shows that the zinc atom is coordinated with three oxygen atoms from two ferrocenemonocarboxylates and one water molecule together with two nitrogen atoms from 2,2＇-bipyridine, giving a distorted square-pyramidal coordination geometry. The complex molecules are linked to form an infinite one-dimensional chain by both intermolecular hydrogen bonds and π-π stacking interactions of the bipyridine rings.
