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SYNTHESIS AND CHARACTERIZATION OF RARE EARTH METAL COMPLEXES WITH PIPERONAL ISONICOTINOYL HYDRAZONE
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作者 Ming Xiong WAN Han Qiu DEAN (Department of Chemistry,Hubei University,Wuhan,430062)Wei Da SHAN Pei Zhi CHEN (Laboratory Center,Hubei University,Wuhan,430062) 《Chinese Chemical Letters》 SCIE CAS CSCD 1991年第7期587-588,共2页
Complexes of La(Ⅲ),Nd(Ⅲ),Sm(Ⅲ),Eu(Ⅲ),Gd(Ⅲ),Dy(Ⅲ), Er(Ⅲ),Yb(Ⅲ)and Y(Ⅲ)with piperonal isonicotinoyl hydrazone(HPIN) have been synthesized in DMF and EtOH.The complexes have been characte- rized by elemental ana... Complexes of La(Ⅲ),Nd(Ⅲ),Sm(Ⅲ),Eu(Ⅲ),Gd(Ⅲ),Dy(Ⅲ), Er(Ⅲ),Yb(Ⅲ)and Y(Ⅲ)with piperonal isonicotinoyl hydrazone(HPIN) have been synthesized in DMF and EtOH.The complexes have been characte- rized by elemental analysis,molar conductance,i.r.,UV and^1H n.m.r. spectra,magnetic measurements,X-ray powder diffraction and DTA. 展开更多
关键词 SYNTHESIS AND CHARACTERIZATION OF RARE earth metal complexes WITH PIPERONAL ISONICOTINOYL HYDRAZONE EU
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Study on Adsorption Behavior of Rare Earth Complexes on Nanometer-Size Titanium Dioxide with ICP-AES 被引量:3
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作者 梁沛 江祖成 +1 位作者 胡斌 秦永超 《Journal of Rare Earths》 SCIE EI CAS CSCD 2003年第4期474-477,共4页
A new method of using nanometer TiO 2 as solid phase extractant coupled with ICP AES was proposed for speciation of rare earth elements. The adsorption behavior of rare earth complexes on nanometer TiO 2 was inves... A new method of using nanometer TiO 2 as solid phase extractant coupled with ICP AES was proposed for speciation of rare earth elements. The adsorption behavior of rare earth complexes on nanometer TiO 2 was investigated. Effect of pH value, contact time, elution solution and interfering ions on the recovery of the rare earth complexes were studied. A quantitative recovery (>90%) was found in the pH range of 4~9.0 for Eu citric, 4.5~9.0 for Eu oxine and Eu HIBA, and 6.5~9.0 for Eu 3+ . Eu EDTA can not be adsorbed in the pH range studied. There is large difference in the adsorption behavior on nanometer TiO 2 between rare earth element and its complexes. The possibility of application of nanometer TiO 2 on the speciation of rare earth element was explored. 展开更多
关键词 inorganic metallic materials nanometer TiO 2 Eu complexes adsorption SPECIATION rare earths
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Microcalorimetric study on host-guest complexation of naphtho-15-crown-5 with four ions of alkaline earth metal 被引量:1
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作者 宋明芝 朱兰英 +2 位作者 高希柯 窦建民 孙德志 《Journal of Zhejiang University-Science B(Biomedicine & Biotechnology)》 SCIE EI CAS CSCD 2005年第1期69-73,共5页
Thermodynamic parameters of complexation of naphto- 15-crown-5 with four alkaline earth ions in aqueous media was determined using titration microcalorimetry at 298.15 K. The stability of the complexes, thermal effect... Thermodynamic parameters of complexation of naphto- 15-crown-5 with four alkaline earth ions in aqueous media was determined using titration microcalorimetry at 298.15 K. The stability of the complexes, thermal effect and entropy effect of the complexation is discussed on the basis of the guest ions structure and the solvent effect. The stability constants tendency to vary with ion radius was interpreted. Complex of naphtha-15-crown-5 with calcium ion is very stable due to the synergism of static electric interaction and size selectivity between the host and the guest. 展开更多
关键词 MICROCALORIMETRY Host-guest complexation Naphtho-15-crown-5 Alkaline earth metal Molecular recognition
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Structure and Bonding in Some Gd(Ⅲ) Metal Complexes Studied by Three-Dimensional X-Ray Analysis and ^(155)Gd Mssbauer Spectroscopy
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作者 王军虎 Takahashi Masashi +1 位作者 Kitazawa Takafumi Takeda Masuo 《Journal of Rare Earths》 SCIE EI CAS CSCD 2007年第6期647-653,共7页
Some functional lanthanide metal complexes, such as acetylacetonato complexes, ethylenediaminetetraacetato complexes, were successfully applied for diagnostic technique. The authors are interested in investigating the... Some functional lanthanide metal complexes, such as acetylacetonato complexes, ethylenediaminetetraacetato complexes, were successfully applied for diagnostic technique. The authors are interested in investigating the structure and bonding in lanthanide and actinide metal complexes using 166Er, t55Gd, and 237Np Mtissbauer spectroscopies in connection with single-crystal and/or powder X-ray diffraction, making clear the differences on their structures as well as the differences in the participation of 4f and 5f orbitals in the chemical bonds. In this article, the crystal structures of two novel Gd(Ⅲ) acetylacetonato complexes, Gd(pta)3 · 2H2O (pta = 1,1,1 -trifluoro-5,5-dimethy 1-2,4-hexanedione) and Gd(bfa)3 · 2H2O (bfa = 1, 1, 1 -trifluoro-4-phenyl-2-4-butanedione) were reported. Though both of them were dihydrate and had distorted square antiprismatical structure, Gd(pta)3 · 2H2O crystallizes in the P 2 1/n (#14) monoclinic space group and its lattice parameters are a = 1.4141(6) nm, b = 1.0708(3) nm, c =2.2344(4) nm, β =952.4(2)°, and Gd(bfa)3· 2H2O crystallizes in P 212121 orthorhombic space group and its lattice parameters were a = 1.322 (1) nm, b = 2.295 (1) nm, c = 1. 0786(8) nm. In the meantime, the authors had finished a systematic investigation on the ^155Gd Mossbauer isomer shift (δ) of various Gd(Ⅲ) metal complexes having a different coordination number (C.N.) and different ratios coordinating oxygen to nitrogen. A tendency for the 6 value to decrease with an increase in the C.N, and the number of the nitrogen atom coordinating to Gd was confirmed. This indicated that the Gd-O and/or Gd-N bond in the investigated Gd(Ⅲ) metal complexes had a small covalent contribution, which was possible to be deduced from the O and/or N atoms of the lisands donating electrons to 6s, 5d, and 4f orbitals of Gd. 展开更多
关键词 Gd(Ⅲ) metal complex crystal structure bonding ^155Gd Mossbauer spectroscopy three-dimensional X-ray analysis covalent contribution rare earths
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Synthesis of Heterometallic Rare Earth(Ⅲ)-Cobalt(Ⅱ)Complexes and Their Application in Alternating Copolymerization of Cyclohexene Oxide and Carbon Dioxide 被引量:3
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作者 Yanping Song Kuan Yin +5 位作者 Yongjie Chen Bei Zhao Yong Zhang Xuehua Zhu Dan Yuan Yingming Yao 《Chinese Journal of Chemistry》 SCIE CAS CSCD 2023年第7期805-813,共9页
Comprehensive Summary Four heterometallic rare earth(Ⅲ)-cobalt(Ⅱ)complexes(rare earth=Y(1),Sm(2),Nd(3),La(4))stabilized by an o-phenylenediamine-bridged tris(phenolato)ligand(L)have been synthesized and characterize... Comprehensive Summary Four heterometallic rare earth(Ⅲ)-cobalt(Ⅱ)complexes(rare earth=Y(1),Sm(2),Nd(3),La(4))stabilized by an o-phenylenediamine-bridged tris(phenolato)ligand(L)have been synthesized and characterized.In these tetranuclear complexes,one polydentate L coordinates to one rare earth(Ⅲ)ion,and one cobalt(Ⅱ)ion,respectively,while two rare earth ions are bridged by four acetate groups.These complexes were applied in the copolymerization of cyclohexene oxide and CO_(2),which showed good activity(TON up to 440)and high poly(cyclohexene carbonate)selectivity(>99%).Kinetic studies determined the equation as rate=k[CHO]1[CO_(2)]0[initiator]1,which proves a first-order dependence on initiator concentrations and implies a synergistic mechanism with rare earth and cobalt ions cooperating in epoxide ring-opening and chain propagation. 展开更多
关键词 Carbon dioxide Rare earth metal Heterometallic complexes Poly(cyclohexene carbonate) Crystal structure
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Syntheses and Characterization of Two New Alkaline Earth Metal-organic Topological Frameworks with 3-Amino-1H-1,2,4-triazole-5-carboxylate
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作者 陈友存 许军军 +1 位作者 汪快兵 王彦 《Chinese Journal of Structural Chemistry》 SCIE CAS CSCD 2011年第6期799-804,共6页
Two new alkaline earth metal coordination polymers constructed from the deriva-tive of 1,2,4-triazole are presented herein,namely,{[Sr(AmTAZAc)2(H2O)]}(1) and {[Ba(AmTAZAc)2(H2O)]}(2)(AmTAZAc = 3-amino-1H... Two new alkaline earth metal coordination polymers constructed from the deriva-tive of 1,2,4-triazole are presented herein,namely,{[Sr(AmTAZAc)2(H2O)]}(1) and {[Ba(AmTAZAc)2(H2O)]}(2)(AmTAZAc = 3-amino-1H-1,2,4-triazole-5-carboxylate),which have been synthesized by using the layering method and structurally characterized by elemental analysis,IR,and single-crystal X-ray diffraction.Complexes 1 and 2 are isostructural,and both crystallize in the orthorhombic system,space group Fdd2.X-ray structural analysis shows that 1 or 2 has an intriguing 3-D infinite network of(318.438.510) topology based on a 2-D sheet structure of(4,4) net.The result shows that noncovalent interactions play an important role in strengthening the whole structures of the compounds. 展开更多
关键词 coordination polymer alkaline earth metal complex topological frameworks 3-amino-1H-1 2 4-triazole-5-carboxylate
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Photoabsorption cross sections of the alkaline-earth-metal elements under strong interaction conditions
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作者 刘萌萌 马晓光 《Chinese Physics B》 SCIE EI CAS CSCD 2011年第6期441-446,共6页
The strong interatomic interaction effects on photoabsorption cross sections of a private atom have been interpreted by the contribution of both the real and imaginary parts of atomic polarizability in the present wor... The strong interatomic interaction effects on photoabsorption cross sections of a private atom have been interpreted by the contribution of both the real and imaginary parts of atomic polarizability in the present work. Some unresolved differences between the photoabsorption cross sections of isolated atoms and those of condensed atoms, especially near thresholds and resonances, probably could be interpreted by the competition between the imaginary and real parts of atomic frequency-dependent polarizabilities. 展开更多
关键词 condensed-phase photoabsorption complex polarizability alkaline-earth-metal elements
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Blue-emissions Modulated by Packing Forces in Alkaline-earth Metal OrganicFrameworks Based on Thiophene-2,5-dicarboxylic: Structures and Theoretical Calculations
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作者 陈家越 《Chinese Journal of Structural Chemistry》 SCIE CAS CSCD 2018年第12期1960-1970,1846,共12页
Solvothermal reactions of Ca(NO), Sr(NO)with thiophene-2,5-dicarboxylic in DMF afforded two new inorganic-organic hybrid frameworks, [M(TDC)(DMF)]n(M = Ca(1), Sr(2), TDC = thiophene-2,5-dicarboxylic, DMF = N,N?-dimeth... Solvothermal reactions of Ca(NO), Sr(NO)with thiophene-2,5-dicarboxylic in DMF afforded two new inorganic-organic hybrid frameworks, [M(TDC)(DMF)]n(M = Ca(1), Sr(2), TDC = thiophene-2,5-dicarboxylic, DMF = N,N?-dimethylformamide), which have been characterized by single-crystal X-ray diffraction, powder X-ray diffraction, elemental analysis and IR spectra. Both compounds feature three-dimensional(3D) frameworks based on the versatile coordinated modes(μ-η~2:η~2, μ-η~2:η~1, μ-η~2:η~1) of carboxylic groups in tdc ligands. C–H···S hydrogen bonds and C–H···π interactions contribute to the stabilization of the structures. They exhibit weaker packing force compared with their literature isomers. Consequently, blue and blue/green luminescence of two compounds has been observed. Their luminescence mechanism can be ascribed to ligand-to-metal charge transfer(LMCT) compared with the ligand-centered luminescence in their isomers. Electronic structural calculations illustrate that under the condition of weaker packing forces, larger gaps can be achieved, which facilitate the LMCT. This work suggests that the introduction of S-heteroatom can result in more electrons rich in the metal centers, thus giving rise to metal-involved luminescence. 展开更多
关键词 alkaline-earth metal complex thiophene-2 5-dicarboxylic photoluminescence theoretical calculation
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东昆仑大格勒地区稀有和稀土矿化碱性杂岩体的发现及意义 被引量:11
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作者 李五福 王涛 +16 位作者 王秉璋 张新远 谭运鸿 袁博武 王春涛 韩晓龙 金婷婷 郑英 曹锦山 王泰山 张焜 付长垒 陈健 刘建栋 李青 张启龙 陈丽娟 《大地构造与成矿学》 EI CAS CSCD 北大核心 2024年第1期38-49,共12页
稀有、稀土元素由于其特殊的属性对国民经济、国家安全和科技发展具有重要的战略意义。与碱性岩类相关的稀有、稀土矿产资源储量十分丰富,近年来对其勘探和开发越来越受到重视。青海省地质调查院在东昆仑中段大格勒地区首次发现了稀有... 稀有、稀土元素由于其特殊的属性对国民经济、国家安全和科技发展具有重要的战略意义。与碱性岩类相关的稀有、稀土矿产资源储量十分丰富,近年来对其勘探和开发越来越受到重视。青海省地质调查院在东昆仑中段大格勒地区首次发现了稀有和稀土矿化碱性杂岩体,岩石类型主要为含尖晶石磷灰石蛇纹石化橄榄岩、含磷灰石金云母霞石单斜辉石岩、橄榄辉长岩、含磷灰石金云母角闪石岩、磁铁矿化含橄榄石磷灰石碳酸岩等,其中含矿岩石为碳酸岩、橄榄岩、辉石岩等。矿石矿物主要为烧绿石、铌钽铁矿、磷灰石、独居石、钛铁矿。现初步圈定Nb、P矿体一条,矿体厚3.8~56.56 m,Nb_(2)O_(5)品位最高6.9%,平均0.71%;P_(2)O_(5)品位最高14.5%,平均品位5.6%,Ta和REE也伴有矿化,显示了很好的含矿性。这一发现大大拓展了青藏高原稀有、稀土矿的找矿空间,为发现新的、优质的稀有稀土矿产提供重要启示,具有重要的找矿和战略意义。 展开更多
关键词 碱性杂岩体 稀有金属 稀土矿 大格勒 东昆仑
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富含间规聚苯乙烯链段的乙烯/苯乙烯共聚物的合成及力学性能
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作者 曾玺文 何盼 《高分子材料科学与工程》 EI CAS CSCD 北大核心 2024年第9期19-25,共7页
文中采用半夹芯型稀土金属配合物催化乙烯和苯乙烯共聚,合成了一系列具有不同共聚单体组成、富含间规聚苯乙烯链段的乙烯/苯乙烯共聚物。通过控制苯乙烯的投入量调控共聚物中乙烯的插入率,研究了乙烯插入率对共聚物熔点和力学性能的影... 文中采用半夹芯型稀土金属配合物催化乙烯和苯乙烯共聚,合成了一系列具有不同共聚单体组成、富含间规聚苯乙烯链段的乙烯/苯乙烯共聚物。通过控制苯乙烯的投入量调控共聚物中乙烯的插入率,研究了乙烯插入率对共聚物熔点和力学性能的影响。结果表明,当乙烯插入率从9.6%升高到27.6%,共聚物中间规苯乙烯连续链段变短,熔点从256.3℃逐渐降低至241.4℃;当乙烯摩尔分数为72.9%时,表现出类似乙烯的熔点126.3℃。随着乙烯插入率的升高,材料的拉伸强度、弯曲强度逐渐降低,断裂伸长率、冲击强度逐渐升高,将乙烯插入间规聚苯乙烯链段有效改善了材料的脆性。当共聚物中乙烯摩尔分数为22.0%时,拉伸强度和冲击强度分别为54.3 MPa和20.4 kJ/m^(2)。文中合成的乙烯/苯乙烯共聚物强度大、熔点高,并具有一定的韧性。 展开更多
关键词 稀土金属配合物 乙烯/苯乙烯共聚物 配位聚合 间规聚苯乙烯 力学性能
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硫醚与2-甲基-1,5-己二烯反应的机理研究
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作者 李青益 石云 +7 位作者 刘国魁 冷霞 李云志 韦瑶瑶 王佳祺 周慧敏 周广丽 夏其英 《原子与分子物理学报》 北大核心 2024年第3期41-44,共4页
采用密度泛函理论对硫醚与2-甲基-1,5-己二烯的反应机理进行了详细的理论探究.计算结果表明,该反应历程主要包含活性物种的生成、2-甲基-1,5-己二烯的插入、另一分子的硫醚的碳氢键活化三部分.在2-甲基-1,5-己二烯插入步骤中,发现其采用... 采用密度泛函理论对硫醚与2-甲基-1,5-己二烯的反应机理进行了详细的理论探究.计算结果表明,该反应历程主要包含活性物种的生成、2-甲基-1,5-己二烯的插入、另一分子的硫醚的碳氢键活化三部分.在2-甲基-1,5-己二烯插入步骤中,发现其采用6-5-re-插入时需要克服的活化能垒最低,反应时更为占优,在进行烯烃分子内碳碳双键插入完成闭环反应时相对比较容易.通过能量对比探明硫醚的C-H键活化需要克服的能垒最高,为该反应的速控步. 展开更多
关键词 稀土金属配合物 碳氢键活化 密度泛函理论
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Recent Advances in Photocatalytic CO2 Reduction Using Earth-Abundant Metal Complexes-Derived Photocatalysts 被引量:11
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作者 Yanfei Zhao Zhimin Liu 《Chinese Journal of Chemistry》 SCIE CAS CSCD 2018年第5期455-460,共6页
Photochemical reduction of CO2 with H20 into energy-rich chemicals using inexhaustible solar energy is an appealing strategy to simultaneously address the global energy and environmental issues. Earth-abundant metal c... Photochemical reduction of CO2 with H20 into energy-rich chemicals using inexhaustible solar energy is an appealing strategy to simultaneously address the global energy and environmental issues. Earth-abundant metal complexes show promising application in this field due to their easy availability, rich redox valence and tunable property. Great progress has been seen on catalytic reduction of CO2 under visible light illumination employing earth-abundant metal complexes and their hybrids as key contributors, especially for producing CO and HCOOH via the two-electron reduction process. In this minireview, we will summarize and update advances on earth-abundant metal complex-derived photocatalytic system for visible-light driven CO2 photoreduction over the last 5 years. Homogeneous earth-abundant metal complex photocatalysts and earth-abundant metal complex derived hybrid photocatalysts were both presented with focus on efficient improvement strategy. 展开更多
关键词 CO2 reduction visible light earth-abundant metal complexes homogeneous catalysis heterogeneous catalysis
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Syndiotactic Polymerization of Styrene and Copolymerization with Ethylene Catalyzed by Chiral Half-sandwich Rare-earth Metal Dialkyl Complexes 被引量:1
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作者 De-Qian Peng Xin-Wen Yan +1 位作者 Shao-Wen Zhang Xiao-Fang Li 《Chinese Journal of Polymer Science》 SCIE CAS CSCD 2018年第2期222-230,共9页
The syndiotactic polymerization of styrene(St) and the copolymerization of St with ethylene(E) were carried out by using a series of chiral half-sandwich rare-earth metal dialkyl complexes(Cp^x*) as the catalys... The syndiotactic polymerization of styrene(St) and the copolymerization of St with ethylene(E) were carried out by using a series of chiral half-sandwich rare-earth metal dialkyl complexes(Cp^x*) as the catalysts. The complexes are Ln(CH2SiMe3)2(THF)(1-4: Ln = Sc(1), Ln = Lu(2), Ln = Y(3), Ln = Dy(4)) bearing chiral cyclopentadienyl ligand containing bulky cylcohexane derivatives in the presence of activator and AliBu3. For the St polymerization, a high activity up to 3.1 × 10^6 g of polymer mol Ln^-1·h^-1 and a high syndiotactic selectivity more than 99% were achieved. The resulting syndiotactic polystyrenes(sPSs) have the molecular weights(Mn) ranging from 3700 g·mol^-1 to 6400 g·mol^-1 and the molecular weight distributions(Mw/Mn) from 1.40 to 5.03. As for the copolymerization of St and E, the activity was up to 2.4 × 10^6 g of copolymer mol Sc^-1·h^-1·MPa^-1, giving random St-E copolymers containing syndiotactic polystyrene sequences with different St content in the range of 15 mol%-58 mol%. These results demonstrate that the bulky cyclopentadienyl ligands of the chiral half-sandwich rare-earth metal complexes effectively inhibit the continued insertion of St monomers into the(co)polymer chain to some extent in comparison with the known half-sandwich rare-earth metal complexes. 展开更多
关键词 HALF-SANDWICH Rare-earth metal complex Syndiotacti cpolymerization COPOLYMERIZATION STYRENE ETHYLENE
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SYNTHESIS AND CHARACTERISTICS OF HOMOBINUCLEAR MACROCYCLIC COMPLEXES OF RARE EARTH METAL ISOTHIOCYANATE AND PHENOLIC SCHIFF BASES
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作者 阎世平 程鹏 +3 位作者 高焱 廖代正 姜宗慧 王耕霖 《Science China Chemistry》 SCIE EI CAS 1992年第8期936-941,共6页
Eleven homobinuclear macrocyclic rare earth metal ions complexes are obtained as com-pounds of 2:2 Schiff base formed by condensing 2,6-diformyl-4-tert-Butylphenol and triethy-lenetetramine by a template procedure usi... Eleven homobinuclear macrocyclic rare earth metal ions complexes are obtained as com-pounds of 2:2 Schiff base formed by condensing 2,6-diformyl-4-tert-Butylphenol and triethy-lenetetramine by a template procedure using rare earth metal isothiocyanates. These complexesare characterized by elemental analyses, FABMS, IR, conductivity and magnetic susceptibility.The variable-temperature magnetic susceptibility (4--300K) of complexes of Gd(Ⅲ) and Tb(Ⅲ) has been determined. A satisfactory fit to theoretical curve derived from spin Hamil-tonian operator was obtained by least squares method. The exchange interaction parameters areJ =-0.220 cm^(-1) for Gd, ,ZJ~?=-0.052 cm^(-1) for Tb. The results indicate a very weak anti-ferromagnetic interaction between Gd^(3+)-Gd^(3+), Tb^(3+)-Tb^(3+) ions. 展开更多
关键词 BINUCLEAR complex MACROCYCLIC complex rare earth metal MAGNETISM
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NMR and IR Investigations of Ternary Inclusion Complexes among β-Cyclodextrin, Rare Earth Metal Ions, and Naphthalenediamines
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作者 JIANG Huiming ZHANG Shufen +1 位作者 SHI Qi JIA Ying 《Wuhan University Journal of Natural Sciences》 CAS 2009年第3期252-256,共5页
Ternary inclusion complexes β-cyclodextrin (β-CD), rare earth metal ions (YbC13, YC13), and 1,8-naphthalene- diamine/ 1,5-naphthalenediamine are synthesized in basic aqueous media, which are characterized via IH... Ternary inclusion complexes β-cyclodextrin (β-CD), rare earth metal ions (YbC13, YC13), and 1,8-naphthalene- diamine/ 1,5-naphthalenediamine are synthesized in basic aqueous media, which are characterized via IH NMR and IR spectroscopy. The stoichiometric proportion of β-CD : YbC13 : 1, 5-naphthalenedia- mine is 2:1:2, that of β-CD:YCI3 : 1,8-naphthalenediamine is 2:1:1, and that of β-CD:YbC13 : 1,8-naphthalenediamine is 2 : 1 : 1. The IR spectroscopy of the ternary inclusion complexes in the range of 935-1 000 cm 1 reveals the existence of the coordinate bond M---O or M---N. The possible conformations of the ternary inclusion complexes are depicted. 展开更多
关键词 β-cyclodextrin (β-CD) proton nuclear magnetic spectroscopy (NMR) infrared spectroscopy (IR) rare earth metal ternary inclusion complex conformation
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荧光光谱法分别测定铒和镱的多吡啶配合物与牛血清白蛋白的相互作用 被引量:4
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作者 赵晓飞 张培芳 +1 位作者 谢承志 徐靖源 《分析仪器》 CAS 2023年第1期105-111,共7页
目的:分别研究了稀土元素铒(Er)和镱(Yb)的多吡啶配合物与牛血清白蛋白(Bovine serum albumin,BSA)的相互作用,揭示金属药物在体内的分布、转运和代谢过程,为研究作用机制提供实验依据。方法:利用荧光光谱法探讨两种稀土多吡啶配合物与... 目的:分别研究了稀土元素铒(Er)和镱(Yb)的多吡啶配合物与牛血清白蛋白(Bovine serum albumin,BSA)的相互作用,揭示金属药物在体内的分布、转运和代谢过程,为研究作用机制提供实验依据。方法:利用荧光光谱法探讨两种稀土多吡啶配合物与BSA的猝灭机制、结合常数、结合位点数及作用方式。结果:两种配合物能够有效的导致BSA内源荧光静态猝灭;荧光光谱结果显示两种配合物的结合常数均达到10^(4)L·mol^(-1)数量级,且随着温度的升高逐渐降低;两种配合物与BSA的结合位点数约为1,表明形成1:1的非共健复合物;通过热力学参数推断出两种配合物与BSA之间主要靠疏水作用力(ΔH>0,ΔS>0);同步荧光结果表明,两种配合物的加入使BSA的构象发生变化,影响了色氨酸残基的微环境。结论:铒和镱的多吡啶金属配合物均与BSA有很好的结合能力,且结合后改变了BSA的构象,为今后成为药物提供了可能性,也为进一步研究此类稀土配合物代谢动力学打下了基础。 展开更多
关键词 稀土金属铒和镱 多吡啶 配合物 牛血清白蛋白 荧光光谱
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Synthesis, spectral, optical and anti-inflammatory activity of complexes derived from 2-aminobenzohydrazide with some rare earths 被引量:2
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作者 Nasser Mohammed Hosny El Sayed A.El Morsy Yousery E.Sherif 《Journal of Rare Earths》 SCIE EI CAS CSCD 2015年第7期758-764,共7页
Three new metal complexes derived from Er(Ⅲ), Dy(Ⅲ) and Zr(Ⅳ) with 2-aminobenzohydrazide (ABH) were synthesized and characterized by elemental analyses, IR, ^1H-NMR, ES-MS and transmission electron microsco... Three new metal complexes derived from Er(Ⅲ), Dy(Ⅲ) and Zr(Ⅳ) with 2-aminobenzohydrazide (ABH) were synthesized and characterized by elemental analyses, IR, ^1H-NMR, ES-MS and transmission electron microscopy (TEM). The morphology and the particle size were determined by TEM. The results showed that the ligand acted as neutral bi-dentate coordinating to the metal ions through the carbonyl oxygen and amidic amino nitrogen. The aromatic amine group remained inert towards coordination. The optical band gap was measured and found to be 3.3, 3.5 and 4.3 eV for Er(Ⅲ), Dy(Ⅲ) and Zr(Ⅳ), respectively. The optical band gap values indicated a semi-conducting nature of the investigated complexes. The anti-inflammatory and analgesic activities of the tested compounds were determined and compared with standard meloxicam. 展开更多
关键词 Er(Ⅲ) Dy(Ⅲ) Zr(Ⅳ) metal complexes optical band gap rare earths
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Helical ternary complexes of alkaline earth picrates with open-chain crown ether 被引量:1
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作者 刘伟生 温永红 +1 位作者 刘雪原 谭民裕 《Science China Chemistry》 SCIE EI CAS 2003年第4期399-406,共8页
Four solid complexes of alkaline earth picrates with N,N,N′,N′-tetraphenyl-3,6,9-trioxaundecanediamide (TTD), M (Pic)2TTD (1, M = Mg; 2, M = Ca; 3, M = Sr; 4, M = Ba), have been prepared and characterized by element... Four solid complexes of alkaline earth picrates with N,N,N′,N′-tetraphenyl-3,6,9-trioxaundecanediamide (TTD), M (Pic)2TTD (1, M = Mg; 2, M = Ca; 3, M = Sr; 4, M = Ba), have been prepared and characterized by elemental analysis, conductivity measurement, IR spectra, 1H NMR spectra and TG-DTA techniques. Crystal structure of complex 3 shows that the Sr(II) ion is 9-coordinated by five oxygen atoms from TTD and four oxygen atoms from two bidentate picrates, and the coordination polyhedron is distorted tricapped trigonal prism. TTD as a pentadentate ligand forms a right-handed helical coordination structure. The chelating helical chain has a relative fixed radius and then shows a high coordination selectivity to metal ion. The high selectivity of TTD to alkaline earth ions is explained elementarily from the special coordination structures. 展开更多
关键词 ALKALINE earth metal open chain CROWN ether complex HELIX coordination structure.
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Synthesis of Benzoxazine Functionalized Amine-Bridged Bis(phenolato) Rare Earth Complexes and Their Application in Ring-Opening Polymerization of rac-Lactide 被引量:1
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作者 Chunping Feng Debao Mu +3 位作者 Xuehua Zhu Yaorong Wang Dan Yuan Yingming Yao 《Chinese Journal of Chemistry》 SCIE CAS CSCD 2022年第21期2516-2524,共9页
The reactivities of benzoxazine functionalized amine bridged bis(phenol)s LnH_(2)(n=1—3)with rare earth metal complexes were explored,founding that both the aryl substituents of the ligand and the rare earth metals h... The reactivities of benzoxazine functionalized amine bridged bis(phenol)s LnH_(2)(n=1—3)with rare earth metal complexes were explored,founding that both the aryl substituents of the ligand and the rare earth metals have profound influences on reaction outcomes. 展开更多
关键词 Rare earth metal complex Bridging ligands rac-LA Ring opening polymerization Heteroselectivity
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稀土金属苄基配合物高活性催化丙烯腈聚合
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作者 徐森 罗云杰 《宁波大学学报(理工版)》 CAS 2023年第6期64-69,共6页
聚丙烯腈的合成一直是高分子合成和特种高分子材料领域的研究热点.稀土金属苄基配合物(2,5-Me_(2)C_(4)H_(2)CH_(2)CH_(2)NC_(6)H_(5))Ln(CH_(2)C_(6)H_(4)NMe_(2)-o)_(2)(Ln=Sc,La)、(C_(5)Me_(5))Sc(CH_(2)C_(6)H_(4)NMe_(2)-o)_(2)、... 聚丙烯腈的合成一直是高分子合成和特种高分子材料领域的研究热点.稀土金属苄基配合物(2,5-Me_(2)C_(4)H_(2)CH_(2)CH_(2)NC_(6)H_(5))Ln(CH_(2)C_(6)H_(4)NMe_(2)-o)_(2)(Ln=Sc,La)、(C_(5)Me_(5))Sc(CH_(2)C_(6)H_(4)NMe_(2)-o)_(2)、(2,5-Me_(2)C_(4)H_(2)NSiMe_(2)NC_(6)H_(5))Sc(CH_(2)C_(6)H_(4)NMe_(2)-o)_(2)和Ln(CH_(2)C_(6)H_(4)NMe_(2)-o)_(3)(Ln=Sc,Y,La,Lu)可以作为单组分催化剂引发丙烯腈聚合.通过改变辅助配体、聚合溶剂、金属离子以及聚合温度等条件,探究了稀土金属苄基配合物催化丙烯腈聚合的活性及选择性.结果表明,这些稀土金属配合物对丙烯腈聚合表现出很高的催化活性,得到了高分子量的无规聚丙烯腈.辅助配体、溶剂、聚合温度和中心金属半径对所得聚合物的微观结构没有太大影响. 展开更多
关键词 稀土金属配合物 丙烯腈 聚合
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