目的:通过航天诱变选育优良的知母突变体,定向培育成药用部分品质提升的优良种质资源。方法:利用我国发射的神舟三号宇宙飞船搭载知母种子,回收后在地面上筛选繁育,并对枝叶和产量等方面占优势的第4代太空组及地面组知母药用部分中多种...目的:通过航天诱变选育优良的知母突变体,定向培育成药用部分品质提升的优良种质资源。方法:利用我国发射的神舟三号宇宙飞船搭载知母种子,回收后在地面上筛选繁育,并对枝叶和产量等方面占优势的第4代太空组及地面组知母药用部分中多种元素含量用 X 射线荧光光谱(XRF)和粉末 X 射线衍射(PXRD)法测定并对比分析。结果:太空知母元素种类无改变,但 Zn、Sr 元素含量比地面组知母分别提高到2.7和1.7倍,Al 元素含量降低66.7%;并首次用 PXRD 技术在知母中鉴别出一水草酸钙晶体,太空知母中该晶体含量和晶粒尺寸比地面组明显减小。结论:航天诱变第4代知母中一水草酸钙晶体的含量明显减少,微量元素指标明显优化。通过航天诱变育种可以筛选出品质优化的知母新品种。展开更多
Objective: To develop the characterization of the polymorphs and the best preparation method of two forms of the title compound (SU2162). After SU2162 was prepared in accordance with the patent process, the crystal fo...Objective: To develop the characterization of the polymorphs and the best preparation method of two forms of the title compound (SU2162). After SU2162 was prepared in accordance with the patent process, the crystal form I was recrystallized by ethyl acetate and the crystal form II was obtained by the recrystal in acetone. And the two crystal forms were characterized with differential scanning calorimetry (DSC) and X-ray powder diffraction (PXRD). The melting point of crystal form I (triclinic) is at 158°C, and the melting point of crystal form II (monoclinic) is at 163°C. The PXRD studies of the two crystalline samples indicate that they have the distinct diffraction patterns. The method herein can be stably prepared for the two crystal forms of the title compound.展开更多
Study on the microscopic structure of clathrate hydrate has made significant progress in the past decades.This review aims to summarize the state of the art of the experimental characterization of guest molecular occu...Study on the microscopic structure of clathrate hydrate has made significant progress in the past decades.This review aims to summarize the state of the art of the experimental characterization of guest molecular occupancy in clathrate hydrate cages,which is an important area of the microscopic structures.The characterizing method and features of different guest molecular,such as hydrocarbon,carbon dioxide,hydrogen and inhibitor/promoter,in different hydrate cages have been extensively reviewed.A comprehensive use of advanced technologies such as X-ray diffraction,Raman spectroscopy and nuclear magnetic resonance may provide better understanding on the compositions and microscopic mechanisms of clathrate hydrate.展开更多
A chiral supramolecular coordination polymer, [Co（HL）·（DMF）]n（1）, with helical chains from a flexible ligand 5-（imidazol-1-ylmethyl）isophthalic acid（H2L） has been obtained under hydrothermal conditions ...A chiral supramolecular coordination polymer, [Co（HL）·（DMF）]n（1）, with helical chains from a flexible ligand 5-（imidazol-1-ylmethyl）isophthalic acid（H2L） has been obtained under hydrothermal conditions and characterized by elemental analysis, powder X-ray diffraction（PXRD）, IR, Uv/vis spectra, thermal gravimetric analyses（TGA） and also by single-crystal X-ray diffraction. It crystallizes in hexagonal, space group P6522 with a = 8.8109（3）, b = 8.8109（3）, c = 71.771（3） , γ = 120°, V = 4825.3（3） -3, Z = 6, Mr = 695.55, Dc = 1.436 g/cm-3, Rint = 0.0684, F（000） = 2166, the final R = 0.0923 and w R = 0.2697 for 3056 observed reflections（I 2σ（I））. The title coordination polymer 1 shows a chiral layered structure based on right-handed helix chains. Such layers are associated together through hydrogen-bonding interactions to form a 3D supramolecular framework.展开更多
A Zn（Ⅱ） supramolecular coordination polymer, {[Zn2（L）2（m-bix）（H20）]6H2O}n（1）, with an interesting 1D→2D polythreading array from a flexible and angular organic aromaticpolycarboxylate ligand 5-（4-hydroxyp...A Zn（Ⅱ） supramolecular coordination polymer, {[Zn2（L）2（m-bix）（H20）]6H2O}n（1）, with an interesting 1D→2D polythreading array from a flexible and angular organic aromaticpolycarboxylate ligand 5-（4-hydroxypyridinium-l-ylmethyl）isophthalic acid （H2L）, and N-donorligand 1,3-bis（imidazol-l-ylmethyl）benzene （m-bix）, has been obtained under hydrothermalconditions and characterized by elemental analysis, powder X-ray diffraction （PXRD）, IR, thermalgravimetric analyses （TGA） and single-crystal X-ray diffraction. In 1, the Zn（Ⅱ） center has twocoordination geometries. One exhibits a trigonal bipyramidal coordination sphere, and the other isa tetrahedral geometry; L2- has two different coordination modes, with one connecting three Zn（Ⅱ）ions through two monodentate carboxylate groups and the monodentate hydroxyl group, and theother bridging two Zn（Ⅱ） ions through two carboxylate groups. The L2- anions connect the Zn（Ⅱ）centers forming an infinite 1D tubular structure. These 1D tubes are interconnected by the m-bixspacers to form a 2D framework. Such 2D layers are further assembled into a 3D supramolecularnetwork via hydrogen bonds. Meanwhile, the luminescent property of 1 has also been investigatedin detail.展开更多
One cobalt coordinated polymer with 2-fold parallel interpenetration 3D architecture based on flexible 5-（imidazol-1-ylmethyl）isophthalate （L2-） as a main ligand and 4,4＇-bipyridine （bpy） as a nitrogen-containi...One cobalt coordinated polymer with 2-fold parallel interpenetration 3D architecture based on flexible 5-（imidazol-1-ylmethyl）isophthalate （L2-） as a main ligand and 4,4＇-bipyridine （bpy） as a nitrogen-containing ancillary ligand, {[CoL（bpy）0.5（H2O）3]2}n （1）, has been obtained under hydrothermal conditions and characterized by elemental analysis, powder X-ray diffraction （PXRD）, IR spectra, Uv/vis spectra, thermal gravimetric analyses （TGA） and single-crystal X-ray diffraction. It crystallizes in monoclinic, space group C2/c with a = 26.323（4）, b = 14.696（2）, c = 26.630（4） A, β= 157.747（4）°, V = 3901.2（1） A3, Z = 8, Mr= 435.27, Dc = 1.480 g/cm3, /t= 0.923 mm^-1, Rint = 0.0900, F（000） = 1792, the final R= 0.0722 and wR = 0.0946 for 3641 observed reflections （I 〉 2tr（/））. Complex 1 exhibits a two-fold interpenetration 3D framework. As a single net of the 2-fold interpenetration structure, the L2- anion of complex 1, as a bridging ligand, connects the Co（Ⅱ） ion to form two-dimensional layers （Co3L3）n which are further linked to build a three-dimensional framework by bpy ligand.展开更多
文摘目的:通过航天诱变选育优良的知母突变体,定向培育成药用部分品质提升的优良种质资源。方法:利用我国发射的神舟三号宇宙飞船搭载知母种子,回收后在地面上筛选繁育,并对枝叶和产量等方面占优势的第4代太空组及地面组知母药用部分中多种元素含量用 X 射线荧光光谱(XRF)和粉末 X 射线衍射(PXRD)法测定并对比分析。结果:太空知母元素种类无改变,但 Zn、Sr 元素含量比地面组知母分别提高到2.7和1.7倍,Al 元素含量降低66.7%;并首次用 PXRD 技术在知母中鉴别出一水草酸钙晶体,太空知母中该晶体含量和晶粒尺寸比地面组明显减小。结论:航天诱变第4代知母中一水草酸钙晶体的含量明显减少,微量元素指标明显优化。通过航天诱变育种可以筛选出品质优化的知母新品种。
文摘Objective: To develop the characterization of the polymorphs and the best preparation method of two forms of the title compound (SU2162). After SU2162 was prepared in accordance with the patent process, the crystal form I was recrystallized by ethyl acetate and the crystal form II was obtained by the recrystal in acetone. And the two crystal forms were characterized with differential scanning calorimetry (DSC) and X-ray powder diffraction (PXRD). The melting point of crystal form I (triclinic) is at 158°C, and the melting point of crystal form II (monoclinic) is at 163°C. The PXRD studies of the two crystalline samples indicate that they have the distinct diffraction patterns. The method herein can be stably prepared for the two crystal forms of the title compound.
基金Supported by the National Natural Science Foundation of China(51706248,51876222)National Key R&D Program of China(2017YFC0307304)
文摘Study on the microscopic structure of clathrate hydrate has made significant progress in the past decades.This review aims to summarize the state of the art of the experimental characterization of guest molecular occupancy in clathrate hydrate cages,which is an important area of the microscopic structures.The characterizing method and features of different guest molecular,such as hydrocarbon,carbon dioxide,hydrogen and inhibitor/promoter,in different hydrate cages have been extensively reviewed.A comprehensive use of advanced technologies such as X-ray diffraction,Raman spectroscopy and nuclear magnetic resonance may provide better understanding on the compositions and microscopic mechanisms of clathrate hydrate.
基金supported by Education Chamber of Henan Province(No.15A150068)
文摘A chiral supramolecular coordination polymer, [Co（HL）·（DMF）]n（1）, with helical chains from a flexible ligand 5-（imidazol-1-ylmethyl）isophthalic acid（H2L） has been obtained under hydrothermal conditions and characterized by elemental analysis, powder X-ray diffraction（PXRD）, IR, Uv/vis spectra, thermal gravimetric analyses（TGA） and also by single-crystal X-ray diffraction. It crystallizes in hexagonal, space group P6522 with a = 8.8109（3）, b = 8.8109（3）, c = 71.771（3） , γ = 120°, V = 4825.3（3） -3, Z = 6, Mr = 695.55, Dc = 1.436 g/cm-3, Rint = 0.0684, F（000） = 2166, the final R = 0.0923 and w R = 0.2697 for 3056 observed reflections（I 2σ（I））. The title coordination polymer 1 shows a chiral layered structure based on right-handed helix chains. Such layers are associated together through hydrogen-bonding interactions to form a 3D supramolecular framework.
基金supported by Education Chamber of Henan Province(No.15A150068)
文摘A Zn（Ⅱ） supramolecular coordination polymer, {[Zn2（L）2（m-bix）（H20）]6H2O}n（1）, with an interesting 1D→2D polythreading array from a flexible and angular organic aromaticpolycarboxylate ligand 5-（4-hydroxypyridinium-l-ylmethyl）isophthalic acid （H2L）, and N-donorligand 1,3-bis（imidazol-l-ylmethyl）benzene （m-bix）, has been obtained under hydrothermalconditions and characterized by elemental analysis, powder X-ray diffraction （PXRD）, IR, thermalgravimetric analyses （TGA） and single-crystal X-ray diffraction. In 1, the Zn（Ⅱ） center has twocoordination geometries. One exhibits a trigonal bipyramidal coordination sphere, and the other isa tetrahedral geometry; L2- has two different coordination modes, with one connecting three Zn（Ⅱ）ions through two monodentate carboxylate groups and the monodentate hydroxyl group, and theother bridging two Zn（Ⅱ） ions through two carboxylate groups. The L2- anions connect the Zn（Ⅱ）centers forming an infinite 1D tubular structure. These 1D tubes are interconnected by the m-bixspacers to form a 2D framework. Such 2D layers are further assembled into a 3D supramolecularnetwork via hydrogen bonds. Meanwhile, the luminescent property of 1 has also been investigatedin detail.
基金the financial support from Education Chamber of Henan Province(No.15A150068)Key Laboratory of Applied Chemistry of Pingdingshan University(No.201201)
文摘One cobalt coordinated polymer with 2-fold parallel interpenetration 3D architecture based on flexible 5-（imidazol-1-ylmethyl）isophthalate （L2-） as a main ligand and 4,4＇-bipyridine （bpy） as a nitrogen-containing ancillary ligand, {[CoL（bpy）0.5（H2O）3]2}n （1）, has been obtained under hydrothermal conditions and characterized by elemental analysis, powder X-ray diffraction （PXRD）, IR spectra, Uv/vis spectra, thermal gravimetric analyses （TGA） and single-crystal X-ray diffraction. It crystallizes in monoclinic, space group C2/c with a = 26.323（4）, b = 14.696（2）, c = 26.630（4） A, β= 157.747（4）°, V = 3901.2（1） A3, Z = 8, Mr= 435.27, Dc = 1.480 g/cm3, /t= 0.923 mm^-1, Rint = 0.0900, F（000） = 1792, the final R= 0.0722 and wR = 0.0946 for 3641 observed reflections （I 〉 2tr（/））. Complex 1 exhibits a two-fold interpenetration 3D framework. As a single net of the 2-fold interpenetration structure, the L2- anion of complex 1, as a bridging ligand, connects the Co（Ⅱ） ion to form two-dimensional layers （Co3L3）n which are further linked to build a three-dimensional framework by bpy ligand.
