A new mononuclear Cu(II) complex, [Cu(L)] (H2L = 4,4′,6,6v-tetrabromo-2,2′- [ethylenedioxybis(nitrilomethylidyne)]diphenol), has been synthesized and structurally characterized. X-ray crystal structure of th...A new mononuclear Cu(II) complex, [Cu(L)] (H2L = 4,4′,6,6v-tetrabromo-2,2′- [ethylenedioxybis(nitrilomethylidyne)]diphenol), has been synthesized and structurally characterized. X-ray crystal structure of the complex reveals that the Cu(Ⅱ) ion is four-coordinated by two oxygen atoms and two nitrogen atoms from L2- unit. Crystallographic data: monoclinic, space group P21/n with a = 14.076(2), b = 6.9801(14), c = 19.858 (2) A, β= 107.613(2)°, C16n10Br4CuN2O4, Mr = 677.44, V = 1859.6(5) A3, Dc = 2.420 g/cm3,μ = 9.796 mm^-1, F(000) = 1284, Z = 4, the final R = 0.0516 and wR = 0.0938 for 1879 observed reflections with I 〉 2σ(/). The dihedral angel between the two coordination planes of Cu(1)-N(2)--O(4) and Cu(1 )-N( 1 )-O(3)) is 30.08(6)°.展开更多
Trans-2,2?,4,4?-tetramethyl-6,6?-dinitro azobenzene (C16H16N4O4, Mr = 328.32) was isolated from benzene extract of the leaves of Aconitum sungpanense Hand. Mazz. as a new compound, and characterized by spectral method...Trans-2,2?,4,4?-tetramethyl-6,6?-dinitro azobenzene (C16H16N4O4, Mr = 328.32) was isolated from benzene extract of the leaves of Aconitum sungpanense Hand. Mazz. as a new compound, and characterized by spectral methods and X-ray diffraction analysis. It crystallizes in monoclinic system, space group P21/c with a = 8.544(1), b = 13.997(2), c = 7.161(1) ? ?= 112.97(1), V = 788.4(2) ?, Z = 4, Dc = 1.383 g/cm3, F(000) = 344 and ?MoKa) = 0.102 mm-1. The final R = 0.0395 and wR = 0.1140 for 1913 independent reflections with Rint = 0.0109 and 1329 observed reflections with I > 2s(I). The molecule is composed of two phenyl rings through trans N=N.展开更多
Rhodium complex in situ formed by (R)PPhos (4,4’,6,6’tetramethoxy2,2’bis(diphenylphosphino)1,1’bipyridine) with the available rhodium precursors are used for the asymmetric hydroformylation of styren...Rhodium complex in situ formed by (R)PPhos (4,4’,6,6’tetramethoxy2,2’bis(diphenylphosphino)1,1’bipyridine) with the available rhodium precursors are used for the asymmetric hydroformylation of styrene.Effects of total pressure,temperature and the ratio of phosphine/rhodium on catalytic activity,chemoand enantioselectivity are discussed.(R)PPhosRh shows higher activity and regioselectivity and the enantioselectivity is as much as that catalyzed by (S)BINAPRh in the in situ asymmetric hydroformylation of styrene.展开更多
A new 3D Cd(II) coordination polymer, [Cd2L(dpe)]n (1, HaL = 6,6"-dinitro-2,2",4, 4"-biphenyltetracarboxylic acid, dpe = 1,2-di(4-pyridyl)ethylene), has been synthesized using the hydrothermal method and ch...A new 3D Cd(II) coordination polymer, [Cd2L(dpe)]n (1, HaL = 6,6"-dinitro-2,2",4, 4"-biphenyltetracarboxylic acid, dpe = 1,2-di(4-pyridyl)ethylene), has been synthesized using the hydrothermal method and characterized by single-crystal X-ray diffraction, elemental analysis, IR, thermogravimetric analysis, and photoluminescent analysis. Complex 1 crystallizes in the monoclinic system, space group C2/c with a = 8.0006(15), b = 23.900(5), c = 14.836(3) A, fl = 95.723(3)°, V = 2822.7(10) A3, Z = 8, Dc = 1.937 Mg.m3, p = 1.581 mm-1, F(000) = 1608, the final R = 0.0231 and wR = 0.0629 for 2239 observed reflections with I 〉 2a(/). Complex 1 is a 3D pillared bilayer (4,5,7)-connected net with the Schlfli symbol of (4^14·6^7) (4^2·6^5·8^3) (4^4·6^2) topology. The photoluminescent property of 1 is also investigated.展开更多
The understanding of the photolysis process of 2,2’,4,4’,6,6’-hexanitrostillbene(HNS,an insensitive high-energy explosive)is very important not only for enhancing the detonation performance but also for its lifetim...The understanding of the photolysis process of 2,2’,4,4’,6,6’-hexanitrostillbene(HNS,an insensitive high-energy explosive)is very important not only for enhancing the detonation performance but also for its lifetime prediction.In this work,UV-Vis light-induced photolysis of nano HNS was studied by different spectroscopic methods.Nano HNS was found to be sensitive to UV-Vis lights at 365 and 470 nm.The photolysis route of nano HNS was mostly the same as its bulk counterpart,which was likely to be the combination of the isomerization of-NO_(2)to-ONO and the breaking of the C-N bond in Ar-NO_(2)(Ar=Aromatic ring).In addition,the possible mechanism of UV-Vis-induced visible color change was explored for the first time.展开更多
A mononuclear Cobalt(Ⅱ) complex [CoL(H2O)2]n (H2L:4,4′,6,6′-Tetrabromo-2,2′-[ethylenedioxybis(nitrilomethylidyne)]diphenol), has been synthesized and structurally characterized by elemental analysis, IR and X-ray ...A mononuclear Cobalt(Ⅱ) complex [CoL(H2O)2]n (H2L:4,4′,6,6′-Tetrabromo-2,2′-[ethylenedioxybis(nitrilomethylidyne)]diphenol), has been synthesized and structurally characterized by elemental analysis, IR and X-ray diffraction single crystal structure analysis. The crystal of the complex belongs to monoclinic space group P21/c with a=2.516 8(3) nm, b=1.023 43(18) nm, c=0.789 17(14) nm, β=91.375(2)°, V=2.032 1(5) nm3, Z=4, Dc=2.317 Mg·m-3, μ(Mo Kα)=8.747 mm-1, F(000)=1 356, R1=0.049 7, wR2=0.110 4. The crystal structure of [CoL(H2O)2]n indicates that the complex consists of one cobalt(Ⅱ) atom, one L2-unit and two coordinated water molecules, and the coordination number of the cobalt(Ⅱ) atom is six. One-dimensional chain supramolecular structure is formed by intermolecular hydrogen bonds and π-π stacking of neighboring benzene rings. CCDC:652649.展开更多
基金This work was supported by the Foundation of Education Department of Gansu Province (No. 0604-01)the 'Qing Lan' Talent Engineering Funds of Lanzhou Jiaotong University (No. QL-03-01A)
文摘A new mononuclear Cu(II) complex, [Cu(L)] (H2L = 4,4′,6,6v-tetrabromo-2,2′- [ethylenedioxybis(nitrilomethylidyne)]diphenol), has been synthesized and structurally characterized. X-ray crystal structure of the complex reveals that the Cu(Ⅱ) ion is four-coordinated by two oxygen atoms and two nitrogen atoms from L2- unit. Crystallographic data: monoclinic, space group P21/n with a = 14.076(2), b = 6.9801(14), c = 19.858 (2) A, β= 107.613(2)°, C16n10Br4CuN2O4, Mr = 677.44, V = 1859.6(5) A3, Dc = 2.420 g/cm3,μ = 9.796 mm^-1, F(000) = 1284, Z = 4, the final R = 0.0516 and wR = 0.0938 for 1879 observed reflections with I 〉 2σ(/). The dihedral angel between the two coordination planes of Cu(1)-N(2)--O(4) and Cu(1 )-N( 1 )-O(3)) is 30.08(6)°.
基金This work was supported by the Natural Science Foundation of Shaanxi Province (No. 01JK080 and 02JS40).
文摘Trans-2,2?,4,4?-tetramethyl-6,6?-dinitro azobenzene (C16H16N4O4, Mr = 328.32) was isolated from benzene extract of the leaves of Aconitum sungpanense Hand. Mazz. as a new compound, and characterized by spectral methods and X-ray diffraction analysis. It crystallizes in monoclinic system, space group P21/c with a = 8.544(1), b = 13.997(2), c = 7.161(1) ? ?= 112.97(1), V = 788.4(2) ?, Z = 4, Dc = 1.383 g/cm3, F(000) = 344 and ?MoKa) = 0.102 mm-1. The final R = 0.0395 and wR = 0.1140 for 1913 independent reflections with Rint = 0.0109 and 1329 observed reflections with I > 2s(I). The molecule is composed of two phenyl rings through trans N=N.
文摘Rhodium complex in situ formed by (R)PPhos (4,4’,6,6’tetramethoxy2,2’bis(diphenylphosphino)1,1’bipyridine) with the available rhodium precursors are used for the asymmetric hydroformylation of styrene.Effects of total pressure,temperature and the ratio of phosphine/rhodium on catalytic activity,chemoand enantioselectivity are discussed.(R)PPhosRh shows higher activity and regioselectivity and the enantioselectivity is as much as that catalyzed by (S)BINAPRh in the in situ asymmetric hydroformylation of styrene.
基金supported by the National Natural Science Foundation of China(No.21373178)the Open Foundation of Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education(338080043)
文摘A new 3D Cd(II) coordination polymer, [Cd2L(dpe)]n (1, HaL = 6,6"-dinitro-2,2",4, 4"-biphenyltetracarboxylic acid, dpe = 1,2-di(4-pyridyl)ethylene), has been synthesized using the hydrothermal method and characterized by single-crystal X-ray diffraction, elemental analysis, IR, thermogravimetric analysis, and photoluminescent analysis. Complex 1 crystallizes in the monoclinic system, space group C2/c with a = 8.0006(15), b = 23.900(5), c = 14.836(3) A, fl = 95.723(3)°, V = 2822.7(10) A3, Z = 8, Dc = 1.937 Mg.m3, p = 1.581 mm-1, F(000) = 1608, the final R = 0.0231 and wR = 0.0629 for 2239 observed reflections with I 〉 2a(/). Complex 1 is a 3D pillared bilayer (4,5,7)-connected net with the Schlfli symbol of (4^14·6^7) (4^2·6^5·8^3) (4^4·6^2) topology. The photoluminescent property of 1 is also investigated.
基金financially supported by National Natural Science Foundation of China(22006121,21677117)
文摘The understanding of the photolysis process of 2,2’,4,4’,6,6’-hexanitrostillbene(HNS,an insensitive high-energy explosive)is very important not only for enhancing the detonation performance but also for its lifetime prediction.In this work,UV-Vis light-induced photolysis of nano HNS was studied by different spectroscopic methods.Nano HNS was found to be sensitive to UV-Vis lights at 365 and 470 nm.The photolysis route of nano HNS was mostly the same as its bulk counterpart,which was likely to be the combination of the isomerization of-NO_(2)to-ONO and the breaking of the C-N bond in Ar-NO_(2)(Ar=Aromatic ring).In addition,the possible mechanism of UV-Vis-induced visible color change was explored for the first time.
文摘A mononuclear Cobalt(Ⅱ) complex [CoL(H2O)2]n (H2L:4,4′,6,6′-Tetrabromo-2,2′-[ethylenedioxybis(nitrilomethylidyne)]diphenol), has been synthesized and structurally characterized by elemental analysis, IR and X-ray diffraction single crystal structure analysis. The crystal of the complex belongs to monoclinic space group P21/c with a=2.516 8(3) nm, b=1.023 43(18) nm, c=0.789 17(14) nm, β=91.375(2)°, V=2.032 1(5) nm3, Z=4, Dc=2.317 Mg·m-3, μ(Mo Kα)=8.747 mm-1, F(000)=1 356, R1=0.049 7, wR2=0.110 4. The crystal structure of [CoL(H2O)2]n indicates that the complex consists of one cobalt(Ⅱ) atom, one L2-unit and two coordinated water molecules, and the coordination number of the cobalt(Ⅱ) atom is six. One-dimensional chain supramolecular structure is formed by intermolecular hydrogen bonds and π-π stacking of neighboring benzene rings. CCDC:652649.