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二(环戊二烯基)氯化镨的合成已知的二(环戊二烯基)稀土氯化物(C_5H_5)_2LnCl(Ln=Sm~Lu)均为重稀土化合物.曾有人试图合成二(环戊二烯基)轻稀土(Ln=La~Nd)氯化物但未获成功,认为是由于镧系收缩和轻稀土配位的不饱和性.然而,用取代环戊二烯基和茚基或含螯合物为配位体却可以合成轻稀土的化合物.我们采用 NdCl_3·2THF 和环戊二烯钠在 THF 溶液中室温下反应制得了(C_5H_5)_2NdCl·THF.它具有二聚体的结构,属单斜晶系,空间群为 P2_1/c,该化合物在抽空加热下脱 THF,得到组成符合(C_5H_5)_2NdCl 的残余物. 相似文献
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由于镧系收缩和配位不饱和性,导致长期不能合成轻稀土环戊二烯基氯化物。陈文启等借严格控制氯化稀土与环戊二烯基钠的摩尔比为1:0.5,制备了环戊二烯基轻稀土二氯化物(Pr、Ce、Nd),但即使将这一摩尔比调整为1:0.25也不能得到类似的镧的化合物。李毅等以LnCl_3—LiCl(Ln=La、Nd)的四氢呋喃溶液和等摩尔的C_5H_5Na反应,以比较高的收率制备了[Li(THF)_2]_2(μ-Cl)_4C_5Ln·THF,并测定了其晶体结构。我们 相似文献
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铁羰基化合物的研究(η~5-C_5H_5)Fe(CO)_2CH_2COOR的合成 总被引:1,自引:0,他引:1
在我们实验室里采用环戊二烯基羰基铁的钠盐[(η~5-C_5H_5)Fe(CO)_2]Na和氯代乙酸酯ClCH_2COOR(R=C_2H_5,C_3H_7,C_4H_9,C_5H_(11))直接反应合成了铁羰基化合物(η~5-C_5H_5)Fe(CO)_2CH_2COOR(Ⅰ).并通过IR、~1H NMR、~(13)C NMR以及MS的分析,确定了(Ⅰ)的结构.η~5-环戊二烯基(2-烷氧基-2-氧代乙基)二羰基合铁(Ⅰ)的合成路线如下: 相似文献
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含金属—金属键的金属有机化合物在理论和应用上都有重要意义.我们曾报道了含稀土元素—铁键和含稀土元素—锡键的金属有机化合物的合成和结构研究.本工作由(DBM)_2EuOAc(1)(DBM=二苯甲酰甲烷负离子,下同)合成了五个新的含铕—金属键的化合物:(DBM)_2Eu—P(C_6H_5)_2(2),(DBM)_2Eu—Sn(C_6H_5)_3(3),(DBM)_2Eu—Fe(CO)_2(C_5H_5)(4),(DBM)_2Eu—Mo(CO)_3(C_5H_5)(5)和(DBM)_2Eu—W(CO)_3(C_5H_5)(6).通过它们的~(151)Eu 相似文献
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1978年Lappert等人首先合成了二(三甲硅基环戊二烯基)稀土氯化物[Li(THF)](Me_3SiC_5H_4)_2LnCl] (Ln=Y,Yb)和Yb(C_5H_4SiMe_3)_2。三甲硅基环戊二烯基稀土二氯化物,则未见报导.采用三甲硅基环戊二烯作为合成稀土金属有机化合物的配体,不仅可以增加所合成的稀土化合物在非极性溶剂中的溶解度,而且在反应过程中可以减小歧化反应的发生,得到所要求的产物.我们探索了三甲硅基环戊二烯基稀土二氯化物的合成,并对所得到的产物进行了鉴定. 相似文献
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Nd、Er—氟哌酸配合物的合成、结构及其抗菌活性 总被引:8,自引:0,他引:8
引言 氟哌酸(norfloxacin),属于含氟喹诺酮类化合物,是一种八十年代发展起来的广谱抗菌药。在临床上,它已被广泛用于尿道感染、肠道感染等领域,疗效显著。此外,在烧伤领域及对性病的治疗中也得到了应用。为了考察金属离子对氟哌酸抗菌作用的影响,探测氟哌酸抗菌作用的本质,我们合成了氟哌酸与Nd~(3+)、Er~(3+)形成的固体配合物(它们在水和甲醇中的溶解度都明显优于氟哌酸),并对其结构进行了初步探讨,又将它们分别对革兰氏阴性菌(大肠杆菌、痢疾杆菌)和革兰氏阳性菌(金黄色葡萄球菌)采用纸片扩散法进行了抗菌活性实验。 相似文献
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本文报道了一些单立方烷化合物MFe_3S_4(S_2CNR_2)_5(M=Mo,W;R_2=Me_2,Et_2,C_4H_8,OC_4H_8,C_5H_(10))的~1H NMR谱研究,结果表明与铁原子相连的配体的α-H产生了相当大的各向同性位移,它随温度升高而减少,基本上服从居里定律。本文还讨论了化合物中的配体间交换反应以及簇骼中金属原子间耦合作用对配体的NMR的影响。 相似文献
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Dunbar AD Richardson TH McNaughton AJ Hutchinson J Hunter CA 《The journal of physical chemistry. B》2006,110(33):16646-16651
The visible absorption spectra of various substituted porphyrin compounds both in chloroform solution and as Langmuir-Blodgett (LB) solid-state films have been investigated. The porphyrin compounds examined were the Zn, Sn, Mg, and free base derivatives of 5,10,15,20-tetrakis[3,4-bis(2-ethylhexyloxy)phenyl]-21H,23H-porphine (EHO). Changes in the absorption spectra of these materials induced by their exposure to various organic compounds are reported with a view toward determining whether this is a useful approach toward an optical gas sensor. 相似文献
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Two dehydroabietic acid-based arylamines have been synthesized and characterized by FTIR, 1H NMR, 13C NMR, MS spectra and elemental analysis. Their spatial structures were determined by X-ray diffraction analysis. UV-Vis absorption and fluorescence spectral characteristics of these compounds in methanol were investigated. Their fluorescence emission spectra in different polarity solvents were further evaluated. Fluorescent properties and structural relationship of the compounds showed that fluorescence intensity and quantum yield inversely increase with the non-coplanar degree. In addition, the solvent polarity has different effects on the fluorescence emission spectra of two compounds. 相似文献
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XU Liang-zhong ZHANG Shu-sheng ** GAO Hong-rong JIAO Kui . College of Chemistry Chemical Engineering Ocean University of China Qingdao P. R. China . Colloge of Chemistry Molecule Engineering Qingdao University of Science Technology Qingdao P. R. China 《高等学校化学研究》2003,19(4):437-441
IntroductionAs an important type of fungicides,triazolecompounds are highly efficient,low poisonous andinward absorbents[1— 4] .At present,the studies ontriazole derivatives have mainly been concentratedon the compounds with triazole group as the onlyactive group.The report of triazloe compoundsthat contain both a triazole group and other activegroups in a single molecule has rarely been found.Some pyrimidines have been used as high efficientand low poisonous fungicides[5] in control of pow-d… 相似文献
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6,7-Methylenedioxy-3-thia-1(2H,4H)acridone and the related acridine-fused quinolines and pyridines,andalso their flavylium-perchlorates were synthesized.The structures of all these compounds prepared are characterizedby elemental analysis.IR and H-NMR spectra. 相似文献
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The influence of lithium, sodium, potassium, rubidium and cesium on the electronic system of 2-aminonicotinic acid (2-ANA) was studied by the methods of molecular spectroscopy. The vibrational (FT-IR, FT-Raman) and NMR (1H and 13C) spectra of 2-aminonicotinic acid and its alkali metal salts were recorded. Characteristic shifts and changes in intensities of bands along the metal series were observed. The changes of chemical shifts of protons (1H NMR) and carbons (13C NMR) in the series of studied alkali metal 2-aminonicotinates (2-AN) were observed too.Optimized geometrical structures of the studied compounds were calculated by the B3LYP method using the 6-311++G** basis set. Aromaticity indices, atomic charges, dipole moments and energies were also calculated. The theoretical chemical shifts in 1H and 13C NMR spectra and theoretical wavenumbers and intensities of IR and Raman spectra were determined. The calculated parameters were compared to the experimental characteristics of the studied compounds. 相似文献