Three stable coordination polymers(CPs)assembled by 3,5-(carboxybenzyloxy)-benzoic acid(H3L)and 1,10-phenanthroline(phen),namely,[Zn(HL)(phen)]n(1),[Cd(HL)(phen)]n(2)and[Co(HL)(phen)]n(3),have been synthesized under h...Three stable coordination polymers(CPs)assembled by 3,5-(carboxybenzyloxy)-benzoic acid(H3L)and 1,10-phenanthroline(phen),namely,[Zn(HL)(phen)]n(1),[Cd(HL)(phen)]n(2)and[Co(HL)(phen)]n(3),have been synthesized under hydrothermal conditions.Their structures have been determined by single-crystal X-ray diffraction analyses and further characterized by elemental analyses,infrared(IR)spectroscopy and powder X-ray diffraction(PXRD).Investigation on crystal structure indicates that complexes 1-3 exhibit similar architecture.In these complexes,metal ions coordinate with H3L and phen ligands,forming infinite ID chains.Then the adjacent chains combine together through intramolecular hydrogen-bonding interactions,generating 2D supramolecular architectures.In addition,complexes 1~3 present excellent thermal stabilities and 1 and 2 exhibit strong luminescent emission bands at room temperature.展开更多
A new compound 2-(3,5-di-tert-butyl-2-hydroxyphenyl)-2-(3,4-dimethylphenyl) acetic acid dimethylamine salt ([NH2(CH3)2][C24H31O3]) was synthesized and structurally determined. It is of monoclinic system, space...A new compound 2-(3,5-di-tert-butyl-2-hydroxyphenyl)-2-(3,4-dimethylphenyl) acetic acid dimethylamine salt ([NH2(CH3)2][C24H31O3]) was synthesized and structurally determined. It is of monoclinic system, space group P21/c with a = 14.731(2), b = 10.1185(10), c = 17.065(2) A^°, β = 98.293(10)° ,Z = 4, V = 2517.0(6)A^°^3, Dc = 1.091 g/cm^3, F(000) = 904 and Mr= 413.58. The dihedral angle defined by two benzene rings is 98.23°.展开更多
Solvothermal reactions of 3,5-dimethyl-2,6-bis(3-(pyrid-2-yl)-1,2,4-triazolyl) pyridine (L), 1,4-benzendicarboxylic acid (H2bdc), and transitional metal cations of M11 (M = Mn, Co, Cd) in the presence of oxa...Solvothermal reactions of 3,5-dimethyl-2,6-bis(3-(pyrid-2-yl)-1,2,4-triazolyl) pyridine (L), 1,4-benzendicarboxylic acid (H2bdc), and transitional metal cations of M11 (M = Mn, Co, Cd) in the presence of oxalic acid (H2ox) afford three novel supramolecular polymers (CPs), namely, {[M2(ox)(L)2][bdc][M2(Hox)2(OH)(H2O)4]·3H2O}n (M = Mn for 1, Co for 2, Cd for 3). Single-crystal X-ray diffraction analysis reveals that complexes 1-3 are isostructural and the 3D supramolecular structure was connected through non-covalent interactions. With the help of H2ox, the L ligands cheated with center atoms forming a butterfly [M2(ox)(L)2]2+ building block. The bdc2- ligand linked with the unprecedented [M2(Hox)2(OH)2(H2O)4] units through strong O-H...O hydrogen bonds forming a zigzag chain, which are further connected through π-π interactions between L and bdc2- ligands to form a 3D supramolecular structure. Moreover, elemental analyses, IR, thermogravimetric, PXRD and luminescence have been investigated.展开更多
Two new complexes[Co_(2)(L)(4,4´-bip)(H_(2)O)_(3)]_(n)(1)and{[Co(L´)_(2)(phen)]·2H_(2)O)}_(n)(2)(H_(4)L=1-(3,5-dicarboxybenzyl)-3,5-pyrazole dicarboxylic acid,H_(3)L´=1-(3,5-dicarboxybenzyl)-3-pyra...Two new complexes[Co_(2)(L)(4,4´-bip)(H_(2)O)_(3)]_(n)(1)and{[Co(L´)_(2)(phen)]·2H_(2)O)}_(n)(2)(H_(4)L=1-(3,5-dicarboxybenzyl)-3,5-pyrazole dicarboxylic acid,H_(3)L´=1-(3,5-dicarboxybenzyl)-3-pyrazole carboxylic acid,4,4´-bip=4,4´-bis(1-imidazolyl)biphenyl,phen=1,10-phenanthroline)were synthesized.Complexes 1 and 2 have been characterized by IR spectrography,X-ray single-crystal diffraction,elemental analysis and thermogravimetry.1 crystallizes in monoclinic system,space group P2_(1/c).Complex 2 crystallizes in monoclinic system,space group I2/a.It is remarkable that in situ hydrothermal decarboxylation was observed during preparing complex 2.In addition,magnetic analysis indicates that antiferromagnetic interaction exists among Co(Ⅱ)ions in complexes 1 and 2.展开更多
本研究探讨金银花花蕾中3,5-二咖啡酰奎宁酸(3,5-DCQA)对α-葡萄糖苷酶的抑制作用。通过色谱方法从金银花花蕾50%甲醇提取物中分离获得3,5-DCQA,并用质谱与核磁等光谱分析对其化学结构进行鉴定。分别选取大鼠小肠I型及酿酒酵母、面包酵...本研究探讨金银花花蕾中3,5-二咖啡酰奎宁酸(3,5-DCQA)对α-葡萄糖苷酶的抑制作用。通过色谱方法从金银花花蕾50%甲醇提取物中分离获得3,5-DCQA,并用质谱与核磁等光谱分析对其化学结构进行鉴定。分别选取大鼠小肠I型及酿酒酵母、面包酵母、嗜热脂肪芽孢杆菌的II型α-葡萄糖苷酶研究3,5-DCQA对不同α-葡萄糖苷酶抑制活性的选择性,结果表明该物质对α-葡萄糖苷酶的抑制作用与酶的来源有关,并选择性地抑制小肠α-葡萄糖苷酶的麦芽糖水解活性。动力学实验结果揭示3,5-DCQA非竞争性地抑制小肠麦芽糖酶活性(Ki:0.22 m M)。此外,物质结构与活性关系(SAR)的研究显示,3,5-DCQA中咖啡酰氧基团数目与活性有关,其中所含两个咖啡酰氧基团对α-葡萄糖苷酶的抑制活性起关键性作用。因此金银花花蕾中的3,5-DCQA可用于辅助降低餐后高血糖类功能食品的开发与利用。展开更多
目的建立同时测定银菊浸膏中绿原酸、木犀草苷、3,5-O-二咖啡酰基奎宁酸含量的高效液相色谱法,优选最佳提取溶剂。方法色谱条件:Ultimate PLUS C18色谱柱(4.6 mm×250 mm,5μm),以乙腈(A)-0.1%磷酸水溶液(B)为流动相梯度洗脱...目的建立同时测定银菊浸膏中绿原酸、木犀草苷、3,5-O-二咖啡酰基奎宁酸含量的高效液相色谱法,优选最佳提取溶剂。方法色谱条件:Ultimate PLUS C18色谱柱(4.6 mm×250 mm,5μm),以乙腈(A)-0.1%磷酸水溶液(B)为流动相梯度洗脱,流速1.0 m L·min^-1,柱温40℃,波长348 nm,比较不同提取溶剂对浸膏中3种成分的影响。结果绿原酸、木犀草苷、3,5-O-二咖啡酰基奎宁酸分别在0.077-1.920,0.082-3.288,0.141-5.624μg内线性关系良好,平均加样回收率为100.8%(RSD=2.3%),101.5%(RSD=0.7%),97.6%(RSD=0.6%);银菊浸膏乙醇提取显著优于水提取,且40%乙醇提取最佳。结论该法简便、准确,可用于银菊浸膏提取工艺优选与质量控制。展开更多
基金Supported by the NNSFC(No.21576112)NSF of Jilin Province(20180623042TC,20180101181JC,20150623024TC-19)+2 种基金the Project of Education Department of Jilin Province(JJKH20180775KJ)the Project of Human Resources and Social Security Department of Jilin Province(2017956)the Opening Project of Key Laboratory of Polyoxometalate Science of Ministry of Education
文摘Three stable coordination polymers(CPs)assembled by 3,5-(carboxybenzyloxy)-benzoic acid(H3L)and 1,10-phenanthroline(phen),namely,[Zn(HL)(phen)]n(1),[Cd(HL)(phen)]n(2)and[Co(HL)(phen)]n(3),have been synthesized under hydrothermal conditions.Their structures have been determined by single-crystal X-ray diffraction analyses and further characterized by elemental analyses,infrared(IR)spectroscopy and powder X-ray diffraction(PXRD).Investigation on crystal structure indicates that complexes 1-3 exhibit similar architecture.In these complexes,metal ions coordinate with H3L and phen ligands,forming infinite ID chains.Then the adjacent chains combine together through intramolecular hydrogen-bonding interactions,generating 2D supramolecular architectures.In addition,complexes 1~3 present excellent thermal stabilities and 1 and 2 exhibit strong luminescent emission bands at room temperature.
基金supported by the Technology Risk Innovation Fund of PetroChina Company Ltd.
文摘A new compound 2-(3,5-di-tert-butyl-2-hydroxyphenyl)-2-(3,4-dimethylphenyl) acetic acid dimethylamine salt ([NH2(CH3)2][C24H31O3]) was synthesized and structurally determined. It is of monoclinic system, space group P21/c with a = 14.731(2), b = 10.1185(10), c = 17.065(2) A^°, β = 98.293(10)° ,Z = 4, V = 2517.0(6)A^°^3, Dc = 1.091 g/cm^3, F(000) = 904 and Mr= 413.58. The dihedral angle defined by two benzene rings is 98.23°.
基金supported by the National Natural Science Foundation of China (No. 21101097)Natural Science Foundation of Shandong Province (ZR2010BQ023)the State Key Laboratory of Solid Lubrication (No. 0701)
文摘Solvothermal reactions of 3,5-dimethyl-2,6-bis(3-(pyrid-2-yl)-1,2,4-triazolyl) pyridine (L), 1,4-benzendicarboxylic acid (H2bdc), and transitional metal cations of M11 (M = Mn, Co, Cd) in the presence of oxalic acid (H2ox) afford three novel supramolecular polymers (CPs), namely, {[M2(ox)(L)2][bdc][M2(Hox)2(OH)(H2O)4]·3H2O}n (M = Mn for 1, Co for 2, Cd for 3). Single-crystal X-ray diffraction analysis reveals that complexes 1-3 are isostructural and the 3D supramolecular structure was connected through non-covalent interactions. With the help of H2ox, the L ligands cheated with center atoms forming a butterfly [M2(ox)(L)2]2+ building block. The bdc2- ligand linked with the unprecedented [M2(Hox)2(OH)2(H2O)4] units through strong O-H...O hydrogen bonds forming a zigzag chain, which are further connected through π-π interactions between L and bdc2- ligands to form a 3D supramolecular structure. Moreover, elemental analyses, IR, thermogravimetric, PXRD and luminescence have been investigated.
基金the National Natural Science Foundation of China(No.21373178)。
文摘Two new complexes[Co_(2)(L)(4,4´-bip)(H_(2)O)_(3)]_(n)(1)and{[Co(L´)_(2)(phen)]·2H_(2)O)}_(n)(2)(H_(4)L=1-(3,5-dicarboxybenzyl)-3,5-pyrazole dicarboxylic acid,H_(3)L´=1-(3,5-dicarboxybenzyl)-3-pyrazole carboxylic acid,4,4´-bip=4,4´-bis(1-imidazolyl)biphenyl,phen=1,10-phenanthroline)were synthesized.Complexes 1 and 2 have been characterized by IR spectrography,X-ray single-crystal diffraction,elemental analysis and thermogravimetry.1 crystallizes in monoclinic system,space group P2_(1/c).Complex 2 crystallizes in monoclinic system,space group I2/a.It is remarkable that in situ hydrothermal decarboxylation was observed during preparing complex 2.In addition,magnetic analysis indicates that antiferromagnetic interaction exists among Co(Ⅱ)ions in complexes 1 and 2.
文摘本研究探讨金银花花蕾中3,5-二咖啡酰奎宁酸(3,5-DCQA)对α-葡萄糖苷酶的抑制作用。通过色谱方法从金银花花蕾50%甲醇提取物中分离获得3,5-DCQA,并用质谱与核磁等光谱分析对其化学结构进行鉴定。分别选取大鼠小肠I型及酿酒酵母、面包酵母、嗜热脂肪芽孢杆菌的II型α-葡萄糖苷酶研究3,5-DCQA对不同α-葡萄糖苷酶抑制活性的选择性,结果表明该物质对α-葡萄糖苷酶的抑制作用与酶的来源有关,并选择性地抑制小肠α-葡萄糖苷酶的麦芽糖水解活性。动力学实验结果揭示3,5-DCQA非竞争性地抑制小肠麦芽糖酶活性(Ki:0.22 m M)。此外,物质结构与活性关系(SAR)的研究显示,3,5-DCQA中咖啡酰氧基团数目与活性有关,其中所含两个咖啡酰氧基团对α-葡萄糖苷酶的抑制活性起关键性作用。因此金银花花蕾中的3,5-DCQA可用于辅助降低餐后高血糖类功能食品的开发与利用。
文摘目的建立同时测定银菊浸膏中绿原酸、木犀草苷、3,5-O-二咖啡酰基奎宁酸含量的高效液相色谱法,优选最佳提取溶剂。方法色谱条件:Ultimate PLUS C18色谱柱(4.6 mm×250 mm,5μm),以乙腈(A)-0.1%磷酸水溶液(B)为流动相梯度洗脱,流速1.0 m L·min^-1,柱温40℃,波长348 nm,比较不同提取溶剂对浸膏中3种成分的影响。结果绿原酸、木犀草苷、3,5-O-二咖啡酰基奎宁酸分别在0.077-1.920,0.082-3.288,0.141-5.624μg内线性关系良好,平均加样回收率为100.8%(RSD=2.3%),101.5%(RSD=0.7%),97.6%(RSD=0.6%);银菊浸膏乙醇提取显著优于水提取,且40%乙醇提取最佳。结论该法简便、准确,可用于银菊浸膏提取工艺优选与质量控制。