共查询到20条相似文献,搜索用时 62 毫秒
1.
A new kind of Anderson-type chromium-molybdates containing the rare earth elements are synthesized, which have the general molecular formula of (NH4)6[CrMo5Ln(OH2)2O24H6]·xH2O (Ln=La,Ce,Pr,Nd,Sm,Gd and Yb). The components of these heteropoly complexes are determined by chemical elemental analysis, ICP and TG-DTA. And IR, UV, ESR,XPS and 1H NMR are also applied to characterize the complexes as well. The results indicate that the structures of these complexes are Anderson B type and the rare earth elements are in the inner sphere of the heteropoly salts. The thermal stabilities of these complexes studied by TG-DTA show that the range of pyrolysis temperature is between 490℃ and 500℃. 相似文献
2.
稀土与β-二酮及2-(2-吡啶)苯并咪唑三元配合物的研究 总被引:2,自引:0,他引:2
As useful fluorescent reagent, rare earth complexes with β-diketones have been extensively studied. Four new rare earth (La, Eu) ternary complexes with β-diketones, (benzoylacetone (Hbza), 2-thenoyltrifluoroacetone, (HTTA)) and organic base (2-(2-pyridyl) benzimidazole, (Hpbi)) have been synthesized and characterized by elemental analysis, IR, NMR. The general formulae of these complexes are [Ln(bza)3(Hpbi)] and[Ln(TTA)3(Hpbi)]. The effects of coordinated base on UV, especially on fluorescent properties of the complexes were discussed. The results showed that the dehydro-Hpbi, pbi-, strongly enhances the fluorescence of the complexes. 相似文献
3.
Four new ternary rare earth complexes RE(NTA)2AA (RE=Sm3+, Eu3+, Tb3+, Dy3+) have been synthesized by the reaction of rare earth chloride(RECl3·6H2O) with Acrylic Acid (HAA) and 4,4,4-trifluoro-1-(3-pyridyl)-1,3-butanedione(NTA) in alcohol. The copolymerization of the complexes RE(NTA)2AA (RE=Sm3+, Eu3+) with methyl methacrylate (MMA) has been studied by 2, 2-azobis-isobutyronitrile as an initiator. Influence of adding Eu(Ⅲ) and 2,2′-bipyridine(bipy) into copolymer Eu(NTA)2AA-co-MMA on fluorescence property of the Eu copolymer was investigated. The compositions of the complexes and copolymer were characterized by means of elemental analysis and FTIR. The heat decomposing behaviors of the complexes were determined by TG-DTA. The glass transition temperature and molecular weight were obtained by DSC and GPC. The results of fluorescence properties show that the Eu, Sm complexes and Eu copolymer can efficiently emit fluorescence, but the Tb and Dy complexes only emit the fluorescence of β-diketone ligand. 相似文献
4.
微波辐射固相法合成缩二脲铜配合物 总被引:5,自引:0,他引:5
The copper(Ⅱ) complexes of biuret have been synthesized by solid phase reaction with microwave irradiation. The compositions and structures of the complexes are characterized by elemental analysis, molar conductance, in-frared spectra, electronic spectra, magnetic susceptibility, thermogravimetric and differential thermal analysis, X-ray powder diffraction. The two complexes have the compositions of [Cu(bi)2]Cl2(A) and [Cu(bi)2](NO3)2(B)(bi=NH2CONHCONH2) and the molecular formulae of CuC4H10O4N6Cl2 and CuC4H10O10N8, respectively. The molar conductance data show that the complexes are 1∶2 electrolyte. Infrared spectra of the complexes show oxygen atoms have been coordinated with divalent copper ion. The thermal decomposition processes of the complexes show that the final residues are all cupper oxide. The results of indexes to the X-ray powder diffraction data indicate that the crystal structure of the complexes belong to monoclinic system, the lattice parameters are: a=0.6976nm,b=1.1546 nm,c=2.1689nm,β=96.80°,V=1.7346nm3 for A; and a=0.7096nm,b=1.1359 nm,c=2.1002 nm,β=97.05°,V=1.6800nm3 for B, respectively. 相似文献
5.
金刚烷胺邻香兰素Schiff碱稀土配合物的合成、表征及抗菌活性研究 总被引:3,自引:0,他引:3
The new solid complexes [LnL2(NO3)2]NO3 (L=C18H23NO2, N-2-hydroxy-3-methoxy-benzaldehyde-1-aminoadamanantane, Ln=La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Y) of rare earth nitrates with Schiff base derived from o-vanillin and adamantaneamine have been synthesized in non-aqueous system and characterized by elemental analysis, molar conductance, infrared spectra, 1H NMR spectra, thermal analysis. The coordination modes of the bonding in these complexes were discussed and the possible structure were proposed. Every central Ln(Ⅲ) ion in the complexes coordinates with both two Schiff base ligands via four oxygen atoms of the phenol hydroxy groups and methoxy groups and two nitrates via their four oxygen atoms. Their coordination numbers are eight. In addition, the antibacterial activity of the Schiff base ligand and the complexes were studied. 相似文献
6.
4-(3-吲哚基)-3-丁烯-2-酮苯甲酰腙Schiff碱过渡金属配合物的合成、表征及生物活性研究 总被引:4,自引:0,他引:4
A Schiff base ligand 4-[indol-3-yl]-but-3-en-2-one benzoyl hydrazone (HL), and its four transition metal complexes (ML2,M=Cu(Ⅱ), Ni(Ⅱ), Zn(Ⅱ) and Co(Ⅱ)) have been prepared and characterized by means of elemental analysis, EI-MS, molar conductivity, IR, UV-Vis and 1H NMR. The results showed that HL as a bidentate ligand coordinated with transition metal ions to form four-coordination complexes. The antibacterial activity was studied by using the filter scraps diffusion method, and the results indicated that the ligand and the complexes had a low bacteriostatic activity against S. Aureu, P. Aeruginosa and E. Coli. The low in vitro antitumor activity of the title complexes was also observed by using MTT method against KB, A2780, Bel7402 and HELF. 相似文献
7.
A novel coordination polymer [NaGa(dipic)2(H2O)2]n was synthesized by the reaction of gallium(Ⅲ) trichloride with Na-salt of 2,6-pyridinedicarboxylic acid and its crystal structure was determined by X-ray diffraction method. The crystal belongs to monoclinic, space group Cc; the unit cell parameters are a=1.502 9(3), b=1.228 1(3) and c=0.872 38(17) nm, β=92.85(3)°, and Z=4, V=1.608 2(6) nm3, F(000)=920. Infrared, electronic absorption, 1H NMR spectra, as well as the thermal behavior are reported. The antibacterial activity of the gallium(Ⅲ) complex has been studied against Escherichia coli, Bacillus subtilis and Staphylococcus aureus in order to check its potential for chemotherapy agent. The activity is notable and higher than that of the H2L. CCDC: 240619. 相似文献
8.
鼓形有机锡氧簇合物[nBuSn(O)(NNA)]6的合成、晶体结构及生物活性 总被引:2,自引:2,他引:0
The title complex [nBuSn(O)(NNA)]6(1), was synthesized by the reaction of nBuSn(O)OH with naphthalene acetic acid in 1∶1 molar radio, where HNNA=naphthalene acetic acid. The complex was characterized by IR, 1H NMR spectra and elemental analysis. The crystal structure was determined by X-ray diffraction method. It crystallizes in monoclinic system with space group P21/n. The crystal data are: a=2.647 1(5) nm, b=1.412 9(3) nm, c=2.805 7(6) nm, β=116.185(3)°, Z=4, V=9.417(3) nm3, Dc=1.595 g·cm-3, μ=1.632 mm-1, F(000)=4 512, R1=0.050 3, wR2=0.131 2. The structure shows a distorted octahedral configuration with six-coordination for the central tin atom. The bioactivity test shows that the Sn(Ⅳ) complex has selective antibacterial property. CCDC: 752497. 相似文献
9.
Study on the extraction and separation of rare earth with new extractants is important in the rare earth chemistry and nuclear reprocessing. In this work, the extraction of Ce(Ⅲ) with N,N,N′,N′-tetrabutylmalonamide (TBMA) in toluene from nitrate media has been investigated. The effect of the concentration of nitric acid, TBMA and salt-ing-out agent (LiNO3) and also the temperature on the distribution ratios was examined. The stoichiometries of the extracted complexes were determined to be Ce(NO3)3·3TBMA and Ce(NO3)3·4TBMA, respectively. The ap-parent extraction constants and the enthalpy of the extraction were calculated based on the extraction data, which are logKex1=3.97, logKex2=4.75 and ΔrHm?=-31.25kJ·mol-1, respectively. The IR spectra of the loaded organic phase supported the suggested extraction mechanism. 相似文献
10.
5-Chloro-2-methoxybenzoates of heavy lanthanides and yttrium were obtained as di- or tetrahydrates with a metal to ligand
ratio of 1:3 and general formula: Ln(C8H6ClO3)3⋅nH2O, where n=2 for Ln=Tb, Dy, Y and n=4 for Ln=Ho, Er, Tm, Yb, Lu. The complexes were characterized by elemental analysis, IR and FIR spectra,
thermogravimetric studies, X-ray diffraction and magnetic measurements. The carboxylate group appears to be a symmetrical,
bidentate, chelating ligand. All complexes are polycrystalline compounds. Their thermal stabilities were determined in air
and in nitrogen atmospheres. When heated they dehydrate to form anhydrous salts which next in air are decomposed to the oxides
of the respective metals while in nitrogen to the mixtures of carbon and oxides or carbon and oxychlorides of respective metals.
The complexes are more stable in air than in nitrogen.
The solubilities of yttrium and heavy lanthanide 5-chloro-2-methoxybenzoates in water at 293 K are of the order of 10–3 mol dm–3
The magnetic moments of the complexes were determined over the range 77–298 K. They obey the Curie–Weiss law. The values of
μeff calculated for all compounds are close to those obtained for Ln3+ by Hund and Van Vleck. The results indicate that there is no influence of the ligand field of 4f electrons on lanthanide
ions and the metal ligand bonding is mainly electrostatic in nature.
This revised version was published online in August 2006 with corrections to the Cover Date. 相似文献
11.
利用手持技术改进测定乙醇分子结构实验 总被引:1,自引:0,他引:1
利用压强传感器代替排水集气法,改进测定乙醇分子结构实验的仪器装置,并探索最佳反应条件。另外,设计两个空白实验,结合压强变化曲线对实验误差进行相关讨论。 相似文献
12.
13.
14.
15.
Mustafa R. Ibrahim Zacharia A. Fataftah Paul von Ragu Schleyer Peter D. Stout 《Journal of computational chemistry》1987,8(8):1131-1138
Sets of hydrogen molecule equivalents have been developed which permit the calculation of hydrogenation of different types of carbon-carbon bonds from ab initio total energies (3-21G and 6-31G* basis sets, and, to a more limited extent, for MP2/6-31G* data) of reactants and products. The calculated enthalpies of hydrogenation are in good agreement with experiment for unstrained molecules, with average errors on the order of 2 kcal/mol. The 6-31G* equivalents allow the enthalpies for strained molecules to be calculated accurately, but the 3-21G equivalents do not. The equivalents for both basis sets have been tested by calculating the enthalpies of hydrogenation of carbon-carbon bonds in nitrogen- and oxygen-containing organic molecules, free radicals, and classical carbocations. The results are in good agreement with experiment in most cases. 相似文献
16.
V. I. Bol'shakova L. I. Demenkova É. N. Shmidt V. A. Pentegova 《Chemistry of Natural Compounds》1989,24(6):691-694
The compositions of the neutral diterpenoids of the oleoresins of five species of conifers growing in the Transcarpathia have been studied. It has been found that the oleoresins ofAbies alba M.,Larix decidua M., andPicea excelsa L. contain more than 50% of neutral diterpenoids. The group and qualitative compositions of the oxygen-containing diterpenoids have been determined. In the oleoresins ofAbies alba,Picea excelsa, andPicea abies tertiary alcohols — cis-abienol and isocembrol — predominate, while inLarix decidua the main component is the hydroxy ester larixyl acetate. Primary alcohols related to the resin acids have been found in all the oleoresins investigated. Features of the distribution of diterpenoids according to the species of conifers have been revealed. The results obtained are necessary for the chemotaxonomy of conifers of the family Pinceae.Novosibirsk Institute of Organic Chemistry, Siberian Branch, Academy of Sciences of the USSR. Translated from Khimiya Prirodynkh Soedinenii, No. 6, pp. 812–816, November–December, 1988. 相似文献
17.
18.
V. I. Bol'shakova L. I. Demenkova É. N. Shmidt V. A. Pentegova 《Chemistry of Natural Compounds》1988,24(6):691-694
The compositions of the neutral diterpenoids of the oleoresins of five species of conifers growing in the Transcarpathia have been studied. It has been found that the oleoresins ofAbies alba M.,Larix decidua M., andPicea excelsa L. contain more than 50% of neutral diterpenoids. The group and qualitative compositions of the oxygen-containing diterpenoids have been determined. In the oleoresins ofAbies alba,Picea excelsa, andPicea abies tertiary alcohols — cis-abienol and isocembrol — predominate, while inLarix decidua the main component is the hydroxy ester larixyl acetate. Primary alcohols related to the resin acids have been found in all the oleoresins investigated. Features of the distribution of diterpenoids according to the species of conifers have been revealed. The results obtained are necessary for the chemotaxonomy of conifers of the family Pinceae. 相似文献
19.
由于石化行业的生产需要,其材质的使用具有多样性和广泛性,经常会出现顾客委托的测试样品的一个或几个元素跨越光谱仪现有测试程序测量范围的情况。本法通过对光谱仪测试原理的认识,根据光谱仪的测试能力及标样的采集,实现了一个或几个元素测量范围的扩展,并对其测量的影响因素进行了研究。 相似文献