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1INTRODUCTION The construction of metal-organic coordination polymers based on covalent interactions[1]or supra-molecular contacts such as hydrogen-bonding and/orπ-πinteractions)[2]is now of great interest not only due to the enormous variety of intriguing structural topologies themselves,but also to their unexpected physical and chemical properties for potential prac-tical applications as functional materials.Many N-containing ligands,such as4,4?-bipyridine,2,2?-bi-pyridine and1,10-phen… 相似文献
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1 INTRODUCTION Trinuclear molybdenum complexes with Mo3(3-S)(-O)n(-S)3n (n = 0~3) cores have been extensively studied on their diversified reactions towards various organic ligands and many metals. Many derivatives with Mo3S4 core have been rationally synthesized from the cation precursor [Mo3S4(H2O)9]4+ and its neutral derivative Mo3(3-S)(-S)3(DTP)4(H2O)[1]. However, due to their structural lability, complexes with Mo3(3-S)(-O)n(-S)3n (n = 1~3) cores have been reported limitedl… 相似文献
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1 INTRODUCTION Self-assembly of coordination polymers fromthe basic building blocks is of considerable interestdue to their intriguing diverse architectures and po-tential applications in catalysis and advanced mater-ials, such as magnetic, optical a… 相似文献
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1INTRODUCTIONTherehasbeenconsiderableattentionfocusedonthestudyofpalladiumcomplexinorganicsynthesis,catalyticprocesses,chemicalreactivity,spectroscopyandstructuralanalysisandfunctionalmaterials[1].Manypalladacycleshavebeenappliedinthepreparationofliquid-crystallinecomplexes[2],andsomeofthemshowantitumoractivity.Theincreasingimportanceofsuchcyclo-organometalliccomplexleadsustoinvestigatethecyclicPdcomplexeswithenhancedchemicalandthermalstability,fromwhichdetailedspectroscopicandstructuralc… 相似文献
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水合法合成樟脑副产油中异莰烷的分离和鉴定 总被引:1,自引:0,他引:1
樟脑的工业生产通常采用同分异构法。1985年南开大学研制成功树脂催化莰烯直接水合制异龙脑的新工艺,福建省武平林产化工厂引进该技术,用自行研制的9^#催化剂处理异龙脑脱氢后的副产物,提高了副产物与樟脑分离效率。但采用水合法合成樟脑,每生产1t樟脑仍然产生约0.2t副产油,经济效益较低,采用我们的开发的分离回收工艺,可有效地回收副产油中的二甲苯、莰烯(三环烯)、樟脑和未知组分A与B的混合物,水合法生产樟脑的脱氢事国产油中含有有两个主要未知组分(A、B),其总含量约占副产油的29%,沸点及在气相色谱的保留时间十分接近,经过60个塔板数的精馏塔分离可得总含量约90%的混合物,经二次分馏,可分别收集A与B不同质量比的馏分。利用气相色谱、质谱、核磁共振等分析方法,鉴定出A和B分别是外-2,2,3-三甲基双环[2,2,1]庚烷(外异莰烷)和内-2,2-3-三甲基双环[2,2,1]庚烷(内异莰烷)。 相似文献
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等度反相高效液相色谱法测定茶多酚中的儿茶素和咖啡因 总被引:17,自引:1,他引:16
介绍一种简便的等度反相高效液相色谱分析茶多酚中 5种儿茶素和咖啡因的快速方法。样品总的分析时间在 0 5h内。色谱柱为ResolveC18;流动相为水 体积分数为 85 %的磷酸水溶液 乙腈 N ,N 二甲基甲酰胺 (DMF)(体积比为 85 9∶1∶12 0∶2 0 ) ;柱温为 43℃ ;紫外检测波长为 2 80nm。研究了流动相中改良剂DMF与容量因子的关系。被测组分的含量与其峰面积有良好的线性关系 (r =0 .9992~ 0 .9999) ;加标回收率在 83.33%~ 10 4.42 %(RSD在 0 .74%~ 1.43% )。 相似文献
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A novel 2-D sheet inorganic-organic hybrid cadmium polymer,[CdBr2(bpdo)]n (bpdo=N,N'-O,O-4,4'-bipyridine) has been hydrothermally synthesized and characterized by elemental analysis,IR and single-crystal X-ray diffraction. The crystal crystallizes in monoclinic,space group C2/c,with a=16.336(3),b=3.9904(5),c=18.479(3),β=91.640(6)°,Mr= 460.40,V=1204.1(3)3,Z=4,Dc=2.540 g/cm3,μ=8.439 mm-1,F(000)=864,R=0.0314 and wR=0.0733 for 1069 observed reflections (I > 2σ(I)). X-ray diffraction reveals that the title compound consists of the 2-D inorganic-organic hybrid sheet constructed from [CdBr2]n chains and bpdo bridges in the packing motif of…ABAB….The title compound exhibits intense blue photoluminescence in the solid state at room temperature. 相似文献
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