Synthesis and Characterization of Rare Earth Solid Complexes with Sodium 5-Aminosalicylate

Ten new rare earth solid complexes were synthesized by the reaction of sodium 5-aminosalicyliate with rare earth chloride. The structure character, physical and chemical properties of these complexes were studied by IR, UV, ()~1H NMR spectra, TG-DTA, fluorescence, elemental analyses, molar conductance and magnetic susceptibility. The ten rare earth complexes exist in dimeric form probably and the coordination number is seven. The antibacterial activity of the ligand and six complexes was also tested against Staphylococcus aureus, Escherichia coli and Bacillus subtilis, and the effect of Yb complex at 20 mg·ml^(-1) against Staphylococcus aureus is most significant.

THE CRYSTAL STRUCTURE OF RARE EARTH COMPLEX WITH AMINO ACIDS Ⅱ The Crystal Structure of Gtutamate Comptex of Erbium Perchtorate

The crystat structure of {[Er;（L—Glu）;（H;O）;]（ClO;）;·3H;O);has been studied by X-ray diffraction. The crystal is monoctinic with space group P2;and cell parameters a=19.987（3） , b=16.505（3） , c=11.040（2） , β=104.69（1）;, V=3538（1） , Z=2, Dc=2.29 g. cm;, μ=53.2 cm;, F（000）=2384. The asymmetric unit contains two complex motecules and four centre ions. Each erbium （Ⅲ） is coordinated by five oxygen donors from four different glutamates and four oxygen donors from the aqua ligand to form a nine coordination potyhedron. The mean distances of Er—0 （carboxylate） and Er—Ow are 2.439 and 2.41 respectivety. The finat R and Rw are 0.043 and 0. 058, respectivety.

Study of Complexes of Lanthanum with Amino Acids by Titration Calorimeter

The stability constants and thermodynamic functions for complexes of lanthanum with eight kind of amino acids according to 1∶1 and 1∶2 in proportion have been determined by titration calorimeter at 298.15 K. The enthalpy change makes a predominant contribution to the stability of these complexes. The ring in amino acid associated with lanthanum ion helps to enhance the stability of complexes. Steric effects between rings in complexes leads to that the equilibrium constants of reaction of the complexes (1∶2) is much less than that of the complexes (1∶1).

Synergistic corrosion inhibition behavior of rare-earth cerium ions and serine on carbon steel in 3% NaCl solutions

The synergistic inhibition effect of CeCl3(Ce)and serine(Ser)on the corrosion of carbon steel in a 3%NaCl solution was investigated by electrochemical methods and surface analysis.The results showed that both CeCl3 and Ser,when used alone,had limited inhibition effect toward carbon steel corrosion in the 3%NaCl solution.In contrast,the combination of CeCl3 with Ser produced a strong synergistic effect on the corrosion inhibition behavior of carbon steel,improving the inhibition efficiency significantly.The polarization curves showed that the mixture of CeCl3 and Ser acts as a cationic-type inhibitor.Scanning electron microscopy and Fourier transform infrared spectroscopy showed that the synergistic inhibition effect was due to complex formation between the cerium ions and amino acid molecules.

Synthesis and Characterization of Lanthanum Complexes with Amino Acid Schiff Base

Six new complexes of lanthanum with amino acid Schiff base ligands, A-F, were prepared in methanol-aqueous solution. The composition and properties of the title complexes were characterized by elemental analysis, molar conductance, infrared, electronic spectra, H-1 NMR, thermogravimetric and differential thermal analysis.

Synthesis，Crystal Structure and Infrared Spectrum of Lanthanum Dinuclear Coordination Compound with Alanine：〔La2（ala）4（H2O）8〕·（ClO4）6

Lanthanum coordination compound with l-alanine[La2（ala）4（H2O）8]·（ClO4）6（ala=l-alanine） was synthesized by reaction of lanthanum perchlorate with l-alanine in aqueous solution and obtained in the form of single crystals.The X-ray crystal structure has been determined and the IR spectrum has been studied.The title compound Cl6La2C12H44O40N4,Mr=1375.2,crystallizes in the triclinic,space group P1 , with parameters: a= 11.227（3）,b=11.445（2）,c=11.014（3）,α=114.46（2）,β=114.51（2）,γ=78.62（2）°,V=1171.73,Z=1,Dc=1.95 g/cm￣3,F（000）=680,μ=22.9 cm￣-1（MoKα）.The final R=0.050,Rω=0.051.In the crystal,two lanthanum ions are coordinated by four alanine molecules via four carboxylate bridges to form a dinuclear coordination compound.Four water molecules are coordinated to each lanthanum ion. There is a symmetric centre between the two lanthanum ions.The IR spectrum of the coordination compound and the relationship between the IR spectrum and the structure have been studied.The mechanism of the configuration inversion of alanine has been proposed.

Crystal Structure of Praseodymium Complex with L－proline，Pr_2（L－Pro）_6（H_2O）_4·6ClO_4

Pr2(L-Pro)6(H2O)4]·6ClO4(Pro= proline), Mr=1641.4, monoclinic, P21,α=9. 879(3),b=21. 883(4),c=13. 393(2) A, β=91. 23(2) A, V=2895(1) A3, Z=2,Dc=1. 88g/cm3,μ( MoKα)=20. 5cm￣(-1) . F(000)=1648, R =0. 035 for 5032 observed reflections. The coordination polyhedron of Pr( Ⅲ) ion comprises six oxygen atoms from the L-Pro molecules and two from the water molecules, Each L-Pro molecule coordinates to two Pr(Ⅲ) ions through the carboxyl oxygens in a bidentate bridging mode, thus creating one-dimensional chain structure.

Crystal Structure of Praseodymium Complex with L－proline，Pr2（L－Pro）6（H2O）4·6ClO4

Pr2(L-Pro)6(H2O)4]·6ClO4(Pro= proline), Mr=1641.4, monoclinic, P21,α=9. 879(3),b=21. 883(4),c=13. 393(2) A, β=91. 23(2) A, V=2895(1) A3, Z=2,Dc=1. 88g/cm3,μ( MoKα)=20. 5cm￣(-1) . F(000)=1648, R =0. 035 for 5032 observed reflections. The coordination polyhedron of Pr( Ⅲ) ion comprises six oxygen atoms from the L-Pro molecules and two from the water molecules, Each L-Pro molecule coordinates to two Pr(Ⅲ) ions through the carboxyl oxygens in a bidentate bridging mode, thus creating one-dimensional chain structure.

氨基改性Cu-BTC对水溶液中镧铈稀土离子的吸附研究

采用超声浸渍法合成氨基功能化Cu-均苯三甲酸(BTC)复合材料,考察了聚醚胺加入量对Cu-BTC理化性质的影响,通过XRD、FTIR、N_(2)吸附-脱附、SEM、ICP-OES等方法分析了复合材料结构性质及其吸附镧铈稀土离子的能力。实验结果表明,聚醚胺加入量为Cu-BTC质量的1%时,复合材料的理化性质最佳,对稀土离子的吸附量和选择性最大,在pH=6、25℃、水溶液中金属离子初始含量为400 mg/L时,复合材料对Ce^(3+)和La^(3+)稀土离子的吸附容量和选择性分别达到550 mg/g和90%。吸附过程符合准二级动力学模型。再生后的试样对稀土离子的吸附能力下降明显,这是因为吸附过程以络合反应为主,部分稀土离子进入Cu-BTC骨架内难以脱除。

稀土氨基酸配合物的研究情况分析

系统分析了 1991～ 2 0 0 1年间发表的近百篇有关稀土与氨基酸配合物的文献 ,主要讨论作者国籍、刊物、机构、内容和方向等方面的问题。中国的科研人员对稀土氨基酸二元配合物的合成、性质、结构进行了系统的研究。从 90年代末开始 ,研究朝着稀土 氨基酸 过渡金属异核配合物和以氨基酸为配体的高pH值下镧系

稀土氨基酸固体络合物的合成及结构分析进展

本文综述了稀土氨基酸络合物的合成,以及应用红外、核磁、X-射线衍射、热分析等方法进行结构分析研究的进展情况。

氨基酸配合物的性质及应用

本文概述了近年来国内外对稀土与过渡金属的氨基酸配合物的研究 ,主要介绍了它们的性质及其应用等。

稀土、2,2’-联吡啶、邻氨基苯基苯甲酸配合物合成、光谱表征及荧光性质

2,2’-联吡啶(bipy)、邻氨基苯基苯甲酸(HL)与稀土离子(RE=Tb,Eu,Sm,Nd)合成了固体稀土配合物。用元素分析、摩尔电导、紫外光谱、红外光谱、差热-热重分析和荧光光谱,对配合物的组成进行了确定和表征,并对TbL3和TbL3·bipy·3H2O的荧光性能进行了测试和讨论。TbL3·bipy·3H2O的荧光强度比TbL3的荧光强度强。

Pr^(3+)、Eu^(3+)、Tb^(3+)与L-酪氨酸甘氨酸三元固态配合物的合成及其发光性能

在乙醇溶液中合成了三种稀土与Ｌ－酪氨酸、甘氨酸的三元固态配合物ＲＥ（Ｔｙｒ）１．５（Ｇｌｙ）４（ＣｌＯ４）３（ＲＥ＝Ｐｒ、Ｅｕ、Ｔｂ）．并通过摩尔电导、红外光谱、热谱和荧光光谱等进行了表征。铽（Ⅲ）配合物的荧光强度（Ｔｂ：５Ｄ４→７Ｆ６、７Ｆ５、７Ｆ４）比铽（Ⅲ）水合高氯酸盐增大了一个数量级．

Nd^(3+)、Dy^(3+)、Yb^(3+)与L-酪氨酸甘氨酸三元固态配合物的合成与表征

在乙醇溶液中合成了三种稀土与Ｌ－酪氨酸、甘氨酸的三元固态配合物ＲＥ（Ｔｙｒ）１．５（Ｇｌｙ）４（ＣｌＯ４）３（ＲＥ＝Ｎｄ３＋、Ｄｙ３＋、Ｙｂ３＋）。并通过摩尔电导、红外光谱、热谱等进行了表征。

Eu^(3+)、Tb^(3+)、Dy^(3+)与L-脯氨酸、甘氨酸、L-丙氨酸四元固态配合物的荧光光谱研究

对在水中合成的稀土元素(Eu、T b、D y)与L-脯氨酸(L-P ro)、甘氨酸(G ly)、L-丙氨酸(L-A la)四元固态配合物的荧光光谱进行了研究。结果表明:铕、铽配合物的荧光强度均较其相应的盐高(铕高出4.5倍,铽高出9倍);四元配合物的荧光强度较三元配合物有不同程度的提高;四元配合物中,铽的荧光强度较铕的荧光强度高出近11倍。同时对上述实验结果进行了解释。

氨基酸类Schiff碱稀土配合物的合成及其抗肿瘤活性Ⅰ

以邻香兰醛和甘氨酸、Ｌ甲硫氨酸在氢氧化钾的乙醇溶液中合成Ｓｃｈｉｆ碱配体Ｌ１Ｋ，Ｌ２Ｋ（Ｌ１＝Ｃ１０Ｈ１０Ｏ４ＮＫ·Ｈ２Ｏ，Ｌ２＝Ｃ１３Ｈ１６ＮＯ４ＳＫ），将其分别作用于稀土Ｌｎ３＋，配位后生成１１个新配合物：Ｌｎ（Ｌ１）３·ｎＨ２Ｏ（Ｌｎ＝Ｌａ，ｎ＝０；Ｌｎ＝Ｐｒ，Ｎｄ，ｎ＝１；Ｌｎ＝Ｓｍ，Ｅｕ，Ｄｙ，ｎ＝２），Ｌｎ（Ｌ２）３·ｎＨ２Ｏ（Ｌｎ＝Ｌａ，ｎ＝１；Ｌｎ＝Ｐｒ，Ｓｍ，Ｅｕ，Ｄｙ，ｎ＝２），对其进行红外光谱、紫外光谱、摩尔电导、氢核磁共振谱及元素分析，推测Ｓｃｈｉｆ碱配体是以Ｏ—Ｎ—Ｏ的三齿形式与中心金属离子配位的，中心金属离子的配位数为９～１１．

稀土氨基酸配合物的研究

详细总结了近年来在国家自然科学基金资助下,对稀土氮基酸配合物的研究。包括稀土盐与α-氨基酸在水中的相化学、固态配合物的表征和热化学性质研究,探讨了稀土盐与氨基酸形成配合物的某些规律。

Tb^(3+)与氨基酸混配型配合物的合成与表征

在乙醇溶液中合成了ＴｂＣｌ３，Ｔｂ（ＣｌＯ４）３与Ｌ－脯氨酸、甘氨酸形成的二种三元固态配合物Ｔｂ（Ｐｒｏ）０．５（Ｇｌｙ）２．５Ｃｌ３·５Ｈ２Ｏ和Ｔｂ（Ｐｒｏ）０．５（Ｇｌｙ）２．５（ＣｌＯ４）３，并通过摩尔电导、红外光谱、热分析及粉晶荧光光谱等进行了表征．荧光光谱表明，Ｔｂ（Ｐｒｏ）０．５（Ｇｌｙ）２．５Ｃｌ３·５Ｈ２Ｏ配合物中Ｔｂ３＋的５Ｄ４→７Ｆ５跃迁谱带强度较Ｔｂ（Ｐｒｏ）０．５（Ｇｌｙ）２．

高氯酸钕和甘氨酸及丙氨酸混配型配合物的热化学研究

合成了高氯酸钕和甘氨酸、丙氨酸的混配型配合物 经热重、差热、化学分析及与有关文献对比 ,确定其组成为 {Nd2 (Gly) 5(Ala) 3(ClO4 ) 6·2H2 O} n,纯度为 98.75 % 用溶解量热法在具有恒定温度的反应热量计上分别测定了 2 98.15K时反应物和产物在 2mol·L-1的HCl中的溶解焓 设计一热化学循环求出配位反应的焓变ΔrHm,进而计算出配合物的标准生成焓 :ΔfH○———m {Nd2 (Gly) 5(Ala) 3(ClO4 ) 6·2H2 O} =- 70 2 0 .46kJ·mol-1.