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以硝酸镉与吡啶-4-甲酸(HIA)为原料在水热条件下合成了配合物[Cd(IA)2(H2O)4],并用红外光谱、元素分析和X射线单晶衍射进行了表征。该配合物属三斜晶系,P-1空间群,晶胞参数为:a=6.4400(5)nm,b=6.9489(6)nm,c=9.4051(8)nm,α=95.2600(10)°,β=104.580(2)°,γ=111.570(2)°,V=0.037079(5)nm3。配合物中Cd(Ⅱ)位于变形八面体环境中,与分属于两个吡啶-4-甲酸根的2个N原子以及来自于四个配位水分子的O原子配位。 相似文献
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《化学世界》2017,(12)
在N,N-二甲基甲酰胺/水(DMF/H_2O)中,以5-(吡啶基-4-亚甲基)氨基间苯二甲酸(H_2L)为配体,通过溶剂/水热反应合成了一个三维的金属有机框架配合物{[(Cd(L)]·(DMF)-(H_2O)}_n(1),并利用X射线单晶衍射仪、红外光谱、元素分析和固体荧光光谱进行了结构和性质表征。结果表明:配合物1属于正交晶系,Aba2空间群,其中Cd(Ⅱ)呈少见的六配位五角锥配位构型,配体L~(2-)的羧基氧原子和吡啶氮原子均参与了配位;配合物1的固体粉末在210~396nm紫外光激发下产生峰位404nm的蓝色强荧光,但其在空气和水中的结构和荧光性质的稳定性较差。 相似文献
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采用常温搅拌法合成了2,3,6-三巯基均三嗪(ttcH3)和4-氨基-3,5-二(3-吡啶基)-1,2,4-三唑(3-bpt)与过渡金属镉的配合物[Cd(ttcH2)2(3-bpt)2]·2H2O,对其结构进行了X-射线单晶衍射、红外光谱、元素分析以及热重分析等表征。X-射线单晶衍射分析显示该配合物为单核,属于三斜晶系,空间群P-1。配合物在氢键作用下拓展为3D超分子网络结构。热重分析显示该配合物的骨架稳定性较好。 相似文献
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利用2-羟基-3-甲氧基苯甲酸(H2MBA)作为配体,在水热条件下与硝酸铕反应,合成了一维Eu(Ⅲ)配合物{NH4·[Eu(HMBA)4]}n。对合成的配合物进行单晶X射线衍射、元素分析、红外光谱、粉末X射线衍射、热重和荧光光谱测试。单晶X射线衍射结果表明:配合物为正交晶系,空间群为Pnna,八个配位氧在Eu(Ⅲ)周围形成一个四方反棱柱配位环境。配合物呈现一维之字链型,在氢键的作用下组装成三维超分子结构。荧光光谱分析发现配合物用394 nm紫外光激发有特征荧光,表明H2MBA配体能较好的敏化Eu3+发射特征荧光。 相似文献
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利用吡唑-3-甲酸为配体,通过溶液法与氯化钴反应合成出一种钴的配合物,用X射线单晶衍射仪对其进行表征。结果显示,该配合物为单斜晶系,空间群为P21/c,a=0.509 94(2)nm,b=1.139 55(5)nm,c=0.936 80(4)nm,β=95.925(5)°。钴与两个配体分子的N、O原子和水分子的氧原子配位,形成八面体结构。利用紫外-可见吸收光谱与荧光光谱研究它与牛血清白蛋白(BSA)的相互作用。结果表明,该配合物与BSA形成稳定的复合物,荧光猝灭属于静态猝灭,猝灭速率常数kq为3.54×1012L/(mol·s),结合常数K=7.06×105L/mol,结合位点n=1.259 5。 相似文献
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由5-溴-2-羟基苯基乙酮和4-硝基苯甲酰肼在乙醇溶剂中反应得到5-溴-2-羟基苯基乙酮-4-硝基苯甲酰腙(H2L),以该酰腙为配体,与吡啶、硝酸锌反应,水热合成制得一个新的双核配合物5-溴-2-羟基苯基乙酮-4-硝基苯甲酰腙吡啶锌(Ⅱ)(CCDC:851546),并培养成单晶。通过元素分析、红外分析和X射线单晶衍射对其结构进行了表征。该配合物晶体属单斜晶系,空间群为P21/c,晶胞参数a=1.179 89(9)nm,b=1.648 05(12)nm,c=1.023 00(8)nm,β=96.967 0(10)°,Dc=1.751 mg/m3。荧光光谱表明,配体和配合物均具有荧光性能,在475.0 nm处配合物的荧光强度得到了明显增强。 相似文献
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Solid solutions of diphosphates of zinc and copper and of zinc and cobalt were synthesized from mixtures of pure diphosphates at temperatures up to 1000°C. Their X-ray diffractometry patterns varied continuously from one end member to the other. Solid solutions of orthophosphates of composition Zn3−x Cox(PO4 )2, with x = 0.4–1.6, were formed at temperatures up to 950°C; all exhibited the structure of γ-Zn3 (PO4 )2. Solid solutions of orthophosphates of composition Zn3−x Cux (PO4 )2 exhibited more-complex behavior. At 1000°C and copper contents of 20–80 mol%, a phase that is related to Cu3 (PO4 )2, termed here the "ε-phase," predominated. At 850°–950°C and in the region from 20 mol% to ∼33 mol% of copper, the solid solutions (the "η-phase") adopted the structure of graftonite. At 800°–900°C and 10–15 mol% of copper, the solid solutions exhibited a new structure (the "δ-phase"), which we found to be related to the mineral sarcopside. At temperatures 950°C, the solutions that contained 5–15 mol% of copper (the "β-phase") had the structure of β-Zn3 (PO4 )2, whereas at 800°–850°C, solutions with 5 mol% of copper (the "-phase") exhibited the structure of γ-Zn3 (PO4 )2. Attempts to synthesize Cu+ ZnPO4 and Cu+ Cu2+ Zn3 (PO4 )3 were unsuccessful. 相似文献
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为了提高油田的生产效率,设计最佳的油气集输处理的工艺流程,更好地完成油气水分离处理的任务。对油气集输工艺技术进行优化,发挥高效油气水分离处理设备的优势,提高油气水处理的质量,保证油气集输工艺顺利实施,获得最佳的油田产量外输。 相似文献
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建设创新型国家是我们中华民族的历史责任。“自主创新、重点突破、支撑发展、引领未来”的16字方针应当成为我们未来创新活动的指南。建设创新型国家把自主创新放在首位,并提出了引领未来的高标准要求。钢铁科技创新必须突出重点,抓住创新成果产业化这个关键,支撑起行业和国民经济的发展。 相似文献
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相比已经完善丰富的开采和勘探技术,油气的运输以及储存却仍然存在不足之处。我国对能源安全提出更加严格要求的同时,对区域经济的发展规划也有足够重视。因此,保障油气管道的安全则成为了我国能源安全战略的重中之重。在阐释油气管道现阶段在储运安全保障技术发展状况的基础上,分析了现存的问题及解决问题的手段,并指出未来可能使用的目标策略,为今后研究者提供一定程度上的借鉴经验。 相似文献
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膜的污染和劣化及其防治对策 总被引:25,自引:0,他引:25
较为系统地介绍了膜污染和劣化的定义和特点,因膜污染和劣化而造成的膜性能变化,以及如何预防、减少或清除膜污染和劣化的一些通用方法。 相似文献
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James L. White David G. Salladay David O. Quisenberry Donald L. MacLean 《应用聚合物科学杂志》1972,16(11):2811-2827
Gel permeation chromatographic (GPC) and thin-layer chromatographic (TLC) studies of polystyrene, polybutadienes (BR), and their copolymers (SBR) have been carried out. GPC primarily separates them on the basis of molecular size, and TLC, on the basis of composition. Methods of obtaining absolute molecular weight distributions for BR and SBR based upon variations of the Strasbourg Universal Calibration procedure are described. In particular, [η]–M relationships in both the GPC solvent (THF) and in a second solvent (toluene) were used; in addition, results of statistical mechanical calculations for \documentclass{article}\pagestyle{empty}\begin{document}$\overline {s^2 }$\end{document} (based on the assumption of negligible steric hindrance and freely rotating bonds) were applied. An experimental comparison of these methods was carried out, and use of the [η]–M relationships for both solvents was found to give satisfactory results. The predictions of the statistical theory were too low. A detailed study of polymer–solvent–gel interaction in the GPC unit was made through investigation of ternary phase equilibrium in the (polystyrene)–THF–(polymer) system. The polymers studied included BR and SBR with varying styrene contents. Experimental techniques for TLC separations of BR, SBR, and polystyrene according to the composition are described. 相似文献