10024-93-8

Synthesis, characterization and thermal behaviour of solid state compounds of 4-methylbenzylidenepyruvate with lighter trivalent lanthanides

Marques,Melios,Ionashiro

, p. 88 - 91 (2002)

Solid state Ln-4-Me-BP compounds, where Ln stands for lighter trivalent lanthanides (lanthanum to europium) and 4-Me-BP is 4-methylbenzylidenepyruvate, have been synthesized. Elemental analysis, complexometry, X-ray powder diffractometry, infrared spectro

Near-infrared luminescent xerogel materials covalently bonded with ternary lanthanide [Er(III), Nd(III), Yb(III), Sm(III)] complexes

Feng, Jing,Yu, Jiang-Bo,Song, Shu-Yan,Sun, Li-Ning,Fan, Wei-Qiang,Guo, Xian-Min,Dang, Song,Zhang, Hong-Jie

, p. 2406 - 2414 (2009)

A β-diketone ligand 4,4,5,5,5-pentafluoro-1-(2-naphthyl)-1,3- butanedione (Hpfnp), which contains a pentafluoroalkyl chain, was synthesized as the main sensitizer for synthesizing new near-infrared (NIR) luminescent Ln(pfnp)3phen (phen = 1,10-p

Low-temperature heat capacity and thermodynamic properties of crystalline [RE (Gly)3(H2O)2]Cl3 ·2H2O (RE = Pr, Nd, Gly = Glycine)

Liu, Beiping,Tan, Zhi-Cheng,Lu, Jilin,Lan, Xiao-Zheng,Sun, Lixian,Xu, Fen,Yu, Ping,Xing, Jun

, p. 67 - 73 (2003)

Heat capacities of two solid complexes of rare-earth elements with glycine [RE(Gly)3(H2O)2]Cl3 ·2H2O (RE = Pr, Nd, Gly = Glycine) have been measured with a high-precision automatic adiabatic calorimeter over the temperature range from 78 to 380 K. The melting point, molar enthalpy and entropy of fusion for the two complexes were determined on the basis of the heat capacity measurements. Thermal decompositions of the two complexes were studied by thermogravimetric (TG) techniques and a possible mechanism for the decompositions is suggested.

Microcalorimetric studies on the interactions of lanthanide ions with bovine serum albumin

Li,Wang,Li,Wang

, p. 899 - 905 (2007)

The interactions of lanthanide ions (Ln3+) with bovine serum albumin (BSA) under mimetic physiological conditions (310.15 K, pH 6.7, 0.1MNaCl) were studied by microcalorimetry. For the first time, based on Two Sets of Independent Sites Model, m

Bochkarev, L. N.,Bochkarev, M. N.,Kalinina, G. S.,Razuvaev, G. A.

, (1981)

A systemic study of stepwise chlorination-chemical vapor transport characteristics of pure rare earth oxides from Sc2O3 to Lu2O3 mediated by alkaline chlorides as complex former

Sun, Yan-Hui,He, Peng,Chen, Hua-Ni

, p. 352 - 358 (2007)

A systematic study has been carried out for the stepwise chlorination-chemical vapor transport (SC-CVT) characteristics of pure rare earth oxides from Sc2O3 to Lu2O3 mediated by the vapor complexes KLnCl4 and NaLnCl4 (Ln = Sc, Y and La-Lu) used NaCl and KCl as complex former, respectively. The results showed that the SC-CVT characteristics are similarly for NaCl and KCl as complex former, the main deposition temperature of the rare earth chlorides LnCl3 is in the increasing order ScCl3 3 3, and then with a systematically decreasing trend from the early lanthanide chlorides to the end one. The results also showed that the total transported amount of the produced chlorides is YCl3 > ScCl3, and they are much higher than that of most lanthanoid chlorides. For lanthanoids, the total transported amount of chloride increases systematically from the early lanthanoid chlorides to the end one except for EuCl3 and GdCl3 mediated by KCl and NaCl as complex former, respectively, which showed the divergence effect of Gd in the total transport efficiency. But there are some differences in SC-CVT characteristics of pure rare earth oxide mediated by KCl and NaCl as complex former, that is the main deposition temperature region for the same rare earth element was lower for KCl than that for NaCl as complex former except for LaCl3, CeCl3, YbCl3 and LuCl3, while the total transport amount of rare earth chloride for KCl as complex former is higher than that for NaCl except for LaCl3 and EuCl3. More over, the discussion was carried out for Sc and Y on the one hand and the lanthanides contain 4f electron as another hand based on the 4f electron hybridization assumption. Further more, the transport characteristics of rare earth oxides with alkaline chlorides as complex former in this study were compared to that with AlCl3 as complex former.

Comparative study of the mutual separation characteristics for binary mixed oxides Er2O3-Ln2O3 (Ln = Sc, Y, La, Nd, Sm, Gd and Ho) mediated by vapor complexes KLnCl4

Sun, Yan-Hui,Chen, Zhen-Fei,Hu, Sheng-Liang

, p. 175 - 180 (2006)

Mutual separation characteristics for a series of rare earth elements Sc, Y, La, Nd, Sm, Gd, Ho and Er from their binary oxide mixtures Er 2O3-Sc2O3, Er2O 3-Y2O3, Er2O3-La 2O3, Er2O3-Nd2O 3, Er2O3-Sm2O3, Er 2O3-Gd2O3 and Er2O 3-Ho2O3 has been investigated using a stepwise chlorination-chemical vapor transport (SC-CVT) reaction mediated by vapor complexes KLnCl4. The total transported yield of the chlorides produced from the oxide mixtures was in the order of ErCl3 > ScCl3, ErCl3 > YCl3, ErCl3 > LaCl3, ErCl3 > NdCl3, ErCl3 > SmCl3, ErCl3 > GdCl3 and HoCl3 > ErCl3, and the total separation factors are 13.0 for Er:Sc, 1.49 for Er:Y, 1.48 for Er:La, 1.15 for Er:Nd, 2.33 for Er:Sm, 2.72 for Er:Gd and 1.10 for Ho:Er. The largest separation factors 1213.8 for Er:Sc, 6.37 for Er:Y, 189.3 for Er:La, 100.6 for Er:Nd, 105.7 for Er:Sm, 27.8 for Er:Gd and 1.14 for Er:Ho in the lower temperature region, while 102.7 for La:Er, only 14.3 for Nd:Er, 16.7 for Sm:Er, 4.0 for Gd:Er and 2.04 for Ho:Er in the higher temperature region were observed, respectively. The results showed the obvious divergence effect of Gd both in the largest separation factors, the total separation factors and total transport efficiency. Furthermore, the results were discussed on the difference of ionic radius of Sc and Y on the one side and the lanthanoid elements of La, Nd, Sm, Gd, Ho and Er on the other hand, and verified that the ionic radius is one of the decisive factors only for lanthanide elements, not for Sc and Y.

Properties of double chlorides in the systems ACl/NdCl3(A=Na-Cs)

Seifert,Fink,Uebach

, p. 625 - 632 (1988)

The pseudobinary systems ACl/NdCl3(A=Na-Cs) were reinvestigated by means of DTA. With a galvanic cell for solid electrolytes the thermodynamic functions of formation from ACl and NdCl3 together with the free enthalpies of synproportionation from the compounds adjacent in the phase diagrams were measured. They revealed, that only the compounds A2NdCl5 are stable at ambient temperature. All other compounds are existing by a gain of entropy only at higher temperatures. The crystal structures of the compounds were determined by X-ray analysis on powders: the compounds are isotypic with the analogous double chlorides of La and Ce.

Relationships between structure and spectroscopic properties of Nd 3+ ethylenediaminetetramethylenephosphonates and ethylenediaminetetraacetates

Janicki, Rafal,Mondry, Anna

, p. 3429 - 3438 (2013)

The structural and spectroscopic properties of the Nd3+ compounds [C(NH2)3]7[Nd(EDTMP)(CO 3)]·10H2O, K17H3[Nd 4(EDTMP)4]·36H2O, [C(NH 2)3][Nd(EDTA)(H2O)3] and Na[Nd(EDTA)(H2O)3]·5H2O are presented (H4EDTA = ethylenediaminetetraacetic acid, H8EDTMP is a phosphonic acid analogue of H4EDTA). The obtained monomeric [Nd(EDTMP)(CO3)]7- and tetrameric [Nd4(EDTMP) 4]20- structures, in which bidentate carbonate and tridentate bridged phosphonate coordination patterns appear, are exceptional. The use of different countercations has allowed us to assess their role in crystal formation and their influence on the spectroscopic properties of the investigated crystals. The countercations slightly change the geometry of [Nd(EDTA)(H2O)3]- and some subtle modifications of the geometry of the carboxylic groups is observed. These changes are discussed in the context of hypersensitive transition intensities. The intensities of the f-f transitions in all studied crystals were determined and analyzed basing on the Judd-Ofelt theory. Luminescence of the Nd3+ ions in the NIR region could be observed solely in the phosphonate complexes. The luminescence quantum yields were calculated from the luminescence lifetimes and the Judd-Ofelt parameters. The Φ value for the rigid tetramer [Nd 4(EDTMP)4]20- is twice as large (7 %) as that for the monomer [Nd(EDTMP)(CO3)]7- (3.5 %). The influence of different countercations on the structural and spectroscopic properties of Nd3+ complexes with ethylenediaminetetraacetic acid (EDTA) and its phosphonate analogue ethylenediaminetetramethylenephosphonic acid (EDTMP) are discussed. The absence of water molecules in the inner coordination spheres of the Nd3+ ions in the phosphonates is a reason for the efficient near-IR (NIR) f-f luminescence of the Nd3+-EDTMP crystals. Copyright

Electronic absorption spectra of lanthanides in a molten chloride: II. Absorption characteristics of neodymium(III) in various molten chlorides

Fujii, Toshiyuki,Nagai, Takayuki,Sato, Nobuaki,Shirai, Osamu,Yamana, Hajimu

, p. L1-L5 (2005)

Electronic absorption spectra of trivalent neodymium in LiCl-KCl eutectic, NaCl-2CsCl eutectic, CaCl2, LiCl, CsCl and mixtures of these at various temperatures were measured, and the variation of the absorption bands, 4G5/2, 2G7/2 ← 4I9/2, were carefully analyzed. The dependence of their molar absorptivity, oscillator strength, and the degree of the energy splitting on temperature and melt composition were determined. As a result, it was suggested that the NdCl63- complex keeps its octahedral symmetry in the NaCl-2CsCl eutectic, while this symmetry is more distorted in LiCl and CaCl2. Based on these data, the chemical status of NdCl 63- complex in molten chlorides was discussed.

Synthesis, characterization and thermal behaviour of solid-state compounds of light trivalent lanthanide succinates

Lima,Caires,Carvalho,Siqueira,Ionashiro

, p. 50 - 54 (2010)

Characterization, thermal stability and thermal decomposition of light trivalent lanthanide succinates, Ln2(C4H4O4)3 ·nH2O (Ln = La to Gd, except Pm) were investigated employing simultaneous thermogravimetry and differential thermal analysis (TG-DTA), differential scanning calorimetry (DSC), infrared spectroscopy, TG-FTIR system, elemental analysis and complexometry. The dehydration of the lanthanum and cerium compounds occurs in a single step, while for the praseodymium to gadolinium compounds the dehydration occurs in two consecutive steps. The thermal decomposition of the anhydrous compounds occurs in consecutive and/or overlapping steps, except for the cerium compound, with formation of the respective oxides, CeO2, Pr6O11 and Ln2O3 (Ln = La, Nd to Gd), as final residue. The results also provided information concerning the denticity of the ligand and thermal behaviour of these compounds.

Comparison of thermal properties of lanthanide trimellitates prepared by different methods

Lyszczek, Renata

, p. 833 - 838 (2008)

By diffusion in gel medium new complexes of formulae: Nd(btc) ·6H2O, Gd(btc)·4.5H2O and Er(btc)?5H2O (where btc=(C6H3(COO)33-) were obtained. Isomorphous compounds were crystallized in the

Solubility behavior of rare earths with ammonium carbonate and ammonium carbonate plus ammonium hydroxide: Precipitation of their peroxicarbonates

de Vasconcellos, Mari E.,da Rocha,Pedreira,Queiroz, Carlos A. da S.,Abr?o, Alcídio

, p. 426 - 428 (2008)

The purpose of this work is to report the significant behavior of the rare earths when treated with ammonium carbonate and with a binary mixture of ammonium carbonate plus ammonium hydroxide. The carbonates of some rare earths are completely soluble in ammonium carbonate or in ammonium carbonate plus ammonium hydroxide, while others are only partially soluble and finally some are completely insoluble. Addition of hydrogen peroxide to the soluble complexed rare earth carbonates results in the precipitation of a series of a new compounds described as rare earth peroxicarbonates. The rare earths have some different precipitation behavior in the carbonate-peroxide system. Some are completely and immediately precipitated, others are completely precipitated after an aging period, and finally other are not precipitated at all. These different behaviors open a new possibility for the separation chemistry of the rare earths. Sm, Gd, Dy, Y, Yb and Tm are fast and completely soluble in ammonium carbonate. Ho, Eu and Tb are completely soluble in ammonium carbonate but slowly dissolved. La, Ce, Pr and Nd are only partially soluble in ammonium carbonate. While Ce, Pr, Nd, Sm, Eu and Dy are completely and easily soluble in the ammonium carbonate plus ammonium hydroxide mixture, La is only partially soluble and Tb is completely insoluble in the same mixture. Concerning the peroxicarbonates, La, Ce, Pr, Nd, Sm, Eu, Gd, Dy and Ho are quantitatively precipitated. The precipitation of the Er peroxicarbonate is quantitative, but after an aging period of 24 h. Y is not precipitated at all. The process is very easy, simple and economically attractive. Although proved in bench scale, its scale-up is easily feasible.

Thermal decomposition of rare earth complexes with 2-amino-3,5-dichlorobenzoic acid

Mrozek,Sikorska,Rzaczynska

, p. 707 - 720 (1997)

The conditions of the thermal decomposition of the 2-amino-3,5-dichloro-benzoates of Y and lanthanides have been studied. During heating in air, the dihydrated complexes Ln(C6H2Cl2NH2COO) 3·2H2/

Synthesis and structural diversity of rare earth anthranilate complexes

Deacon, Glen B.,Forsyth, Maria,Junk, Peter C.,Leary, Stuart G.,Moxey, Graeme J.

, p. 379 - 386 (2006)

Four structural classes have been established for rare earth anthranilates, which have been prepared from the lanthanoid chloride or triflate and anthranilic acid (anthH) followed by pH adjustment to 4. [La(anth) 3]n is a polymeric complex with nine coordinate lanthanum and bridging tridentate (O,O,O′) anthranilate ligands, whereas [Nd(anth)3(H2O)3]·3H2O is monomeric with nine coordinate neodymium and solely chelating (O,O) anthranilate groups. Both chelating (O,O) and bridging bidentate (O,O′) ligands are observed in dimeric [Er2(anth)6(H2O) 4]·2H2O, in which erbium is eight coordinate and the water ligands are in a trans arrangement. A polymer is observed for [Yb(anth)3(H2O)]n with solely bridging bidentate (O,O′) ligands and seven coordination for ytterbium. The NH 2 groups of the anthranilate ligands are not coordinated to the metal but is unusually involved in hydrogen-bond networks with water molecules for Ln = Er, Yb.

Synthesis, characterization and thermal behavior on solid tartrates of light trivalent lanthanides

Ambrozini,Dametto,Siqueira,Carvalho,Ionashiro

, p. 761 - 764 (2009)

Solid state Ln-L compounds, where Ln stands for light trivalent lanthanides (L-Gd) and L is tartrate, have been synthesized. Thermogravimetry and differential thermal analysis (TG/DTA), differential scanning calorimetry (DSC), X-ray powder diffractometry,

Preparation, stability and thermodynamic properties of Nd- and Lu-doped BaCeO3 proton-conducting ceramics

Matskevich, Nata I.,Wolf, Thomas,Matskevich, Mariya Yu.,Chupakhina, Tatiana I.

, p. 1477 - 1482 (2009)

The preparation of BaCeO3 doped by neodymium and lute-tium oxides (BaCe0.8Nd0.2O2.9, BaCe 0.8Lu0.2O2.9) has been performed by solid-state reactions of BaCO3 and CeOsu

Thermal decomposition kinetics and mechanism of lanthanide perchlorate complexes of 4-N-(4′-antipyrylmethylidene)aminoantipyrine

Nair, M.K. Muraleedharan,Radhakrishnan

, p. 115 - 122 (1997)

The thermal decomposition behaviour of lanthanide perchlorate complexes of the Schiff base, 4-N-(4′-antipyrylmethylidene)aminoantipyrine (AA), have been studied using TG and DTG analyses. The phenomenological and kinetic aspects of the TG curves are inves

Synthesis, characterization and thermal behaviour of solid-state compounds of yttrium and lanthanide benzoates

Locatelli,Rodrigues,Siqueira,Ionashiro,Bannach,Ionashiro

, p. 737 - 746 (2007)

Solid-state Ln(Bz)3?H2O compounds where Ln stands for trivalent yttrium or lanthanides and Bz is benzoate have been synthesized. Simultaneous thermogravimetry-differential thermal analysis (TG-DTA), X-ray powder diffractometry, infra

Structural and spectroscopic studies of neodymium complexes with S(+)-mandelic acid

Babij, Micha?,Starynowicz, Przemys?aw,Mondry, Anna

, p. 672 - 677 (2011)

The crystal structure of tetraaquahexakis-S(+)-mandelatodineodymium trishydrate was determined by the X-ray diffraction method. The compound crystallizes in the monoclinic space group P21 with the following unit cell parameters: a = 10.536(2),

Seifert, Hans J.,Fink, Heinrich,Baumgartner, Bruno

, p. 19 - 26 (1993)

Synthesis, characterization and anticoagulant action of lanthanide complexes of warfarin

Jiao, Tian Quan,Wu, Ji Gui,Zeng, Fu Li,Fu, Yun Long,Deng, Ru Wen

, p. 725 - 735 (1999)

Thirteen lanthanide complexes of warfarin, LnL3·nH2O [n = 6 (Ln = La-Yb) or n = 4 (Ln = Y); L = (C19H15O4)-] have been synthesized and characterized by elemental analyses, IR, 1H

Thermochemical investigations on the systems RE2O3-SeO2 IV. Solution calorimetry of the phases RE2SexO3+2x (RE = Nd, Sm, Y)

Zhang-Pre?e,Oppermann

, p. 661 - 667 (2002)

The solution enthalpies have been determined for the ternary phases RE2SexO3+2x existing on the pseudo-binary section RE2O3-SeO2 and for RE2O3 and SeO2 in 4

Characterization of neodymium trichloride hydrates and neodymium hydroxychloride

Kipouros, Georges J.,Sharma, Ram A.

, p. 85 - 100 (1990)

Neodymium trichloride hexahydrate (NdCl3·6H2O) was dehydrated by heating it in either air, argon, HCl or argon - HCl mixtures to germinate the intermediate species. The hexahydrate (NdCl3·6H2O) was found to deco

Comparative study for stepwise chlorination-chemical vapor transport characteristics of pure rare earth oxides from Sc2O3 to Lu2O3 mediated by the vapor complexes LnAlnCl3n+3

Wang, Zhi-Chang,Sun, Yan-Hui,Guo, Lei

, p. 109 - 113 (1999)

A systematic study has been carried out for the stepwise chlorination-chemical vapor transport (SC-CVT) characteristics of pure rare earth oxides from Sc2O3 to Lu2O3 mediated by the vapor complexes LnAlnCl3n+3 (where Ln = rare earth elements) under identical conditions. The results show that the total transported amount of the produced chlorides is the highest for YCl3; it is also high for ScCl3, but low for LaCl3, and then increases systematically from the early lanthanide chlorides to the end lanthanide chlorides except CeCl3, EuCl3 and GdCl3. The results also show that the main deposition temperature of the chlorides is in the increasing order ScCl3 3 3 and then with a systematically decreasing trend from the early lanthanide chlorides to the end lanthanide chlorides. Based on the literature data for the solid complexes LnAl3Cl12 and LnAl3Br12, a similar coordination structure assumption is introduced for the vapor complexes LnAl3Cl3n+3 from Ln = Sc to Ln = Lu with the same stoichiometry to explain the SC-CVT characteristics of the pure rare earth oxides from Sc2O3 to Lu2O3 using a 4f electron hybridization assumption.

Thermal and spectroscopic studies on solid Ketoprofen of lighter trivalent lanthanides

Galico, D. A.,Holanda, B. B.,Perpetuo, G. L.,Schnitzler, E.,Treu-Filho, O.,Bannach, G.

, p. 371 - 380 (2012/04/23)

Solid-state Ln(L)3 compounds, where Ln stands for trivalent La, Ce, Pr, Nd, Sm, Eu, and L is ketoprofen have been synthesized. Thermogravimetry (TG), differential thermal analysis (DTA), differential scanning calorimetry (DSC) as well as X-ray diffraction powder (DRX) patterns, Fourier transformed infrared spectroscopy (FTIR), and other methods ofanalysis were used to study solid Ketoprofen of lighter trivalent lanth anides. The results provided information of the composition, dehydration, coordination mode, structure, thermal behavior, and thermal decomposition. The theoretical and experimental spectroscopic study suggests that the carboxylate group of ketoprofen is coordinate to metals as bidentatebond.