10035-01-5Relevant academic research and scientific papers
The mononuclear and dinuclear dimethoxyethane adducts of lanthanide trichlorides [LnCl3(DME)2]n, n=1 or 2, fundamental starting materials in lanthanide chemistry: Preparation and structures
Baisch, Ulrich,Dell'Amico, Daniela Belli,Calderazzo, Fausto,Conti, Roberto,Labella, Luca,Marchetti, Fabio,Quadrelli, Elsje Alessandra
, p. 1538 - 1548 (2004)
Some new dimethoxyethane (DME) adducts of lanthanide trichlorides of formula [LnCl3(DME)2]n, n=1 or 2; (n=2, Ln=La, Ce, Pr, Nd; n=1, Ln=Eu, Tb, Ho, Tm, Lu) have been prepared by treating Ln 2O3, or LnCl3·nH2O, or Ln2(CO3)3, in DME as medium, with thionyl chloride at room temperature, eventually in the presence of water in the case of Ln2O3 and Ln2(CO3)3. The complexes from lanthanum to praseodymium included are chloro-bridged dimers. In the case of neodymium, the new results complement the literature data, showing that both the mononuclear and dinuclear species exist: neodymium can therefore be regarded as the turning element from dinuclear to mononuclear structures along the series. Only mononuclear complexes were isolated in the Eu-Lu sequence. The lanthanide contraction has been evaluated on the basis of the Ln-O and Ln-Cl bond distances on the isotypical series of the mononuclear complexes LnCl3(DME)2 covering a range of 12 atomic numbers.
Near-infrared luminescence from visible-light-sensitized hybrid materials covalently linked with tris(8-hydroxyquinolinate)-lanthanide [Er(III), Nd(III), and Yb(III)] derivatives
Sun, Lining,Dang, Song,Yu, Jiangbo,Feng, Jing,Shi, Liyi,Zhang, Hongjie
, p. 16393 - 16397 (2010)
A series of new near-infrared (NIR) luminescent lanthanide-quinolinate derivatives [Ln(Q-Si)3] and xerogels (named as LnQSi-Gel, Ln = Er, Nd, Yb) covalently linked with the Ln(Q-Si)3 by using the 8-hydroxyquinoline-functionalized alkoxysilane (Q-Si) have been synthesized. The obtained xerogel materials LnQSi-Gel are rigid and show homogeneous by field-emission scanning electron microscopy (FE-SEM) images. The Fourier-transform infrared (FT-IR), fluorescence spectra of Ln(Q-Si) 3, and LnQSi-Gel were measured, and the corresponding luminescence decay analyses were recorded. Of importance here is that the excitation spectra of the Ln(Q-Si)3 and LnQSi-Gel extend to the region of visible light (more than 500 nm). Upon ligand-mediated excitation with the visible light, the Ln(Q-Si)3 and LnQSi-Gel show the characteristic NIR-luminescence of the corresponding lanthanide ions through the intramolecular energy transfer from the ligands to the lanthanide ions. The good luminescent performances enable these NIR-luminescent xerogel materials to have possible applications in medical diagnostics, laser systems, and optics, etc.
Synthesis and characterization of new polynuclear lanthanide coordination polymers with 4,4′-oxybis(benzoic acid)
Wang, Yi-Bo,Sun, Chang-Yan,Zheng, Xiang-Jun,Gao, Song,Lu, Shao-Zhe,Jin, Lin-Pei
, p. 823 - 830 (2005)
Three new polynuclear lanthanide coordination polymers [Ln 5(μ3-OH)(oba)7(H2O) 2]n ? 0.5nH2O (Ln = Eu (1), Ho (2)) and [Yb6(oba)9(H2O)]n (3) (H 2oba = 4,4′-oxybis(benzoic acid)), were prepared by hydrothermal reactions. 1 and 2 are isomorphous and exhibit complicated three-dimensional structures based on [Ln5(μ 3-OH)(oba)7(H2O)2] building blocks. In the asymmetric unit, there are five different coordination environments of Ln(III) ions, including a trinuclear hydroxo core. Complex 3 is a three-dimensional coordination polymer built up from a hexanuclear building block. In 3, Yb(III) ions have six different chemical environments and are in a regular arrangement, resulting in pseudohexagonal prisms along the a-axis. The luminescent property of 1 and magnetic behaviors of 2 and 3 have also been studied.
Synthesis process and the luminescence properties of rare earth doped NaLa(WO4)2 nanoparticles
Xue, Ning,Fan, Xianping,Wang, Zhiyu,Wang, Minquan
, p. 1891 - 1896 (2008)
Rare earth doped NaLa(WO4)2 nanoparticles have been prepared by a simply hydrothermal synthesis procedure. The X-ray diffraction (XRD) pattern shows that the Eu3+-doped NaLa(WO4)2 nanoparticles with an average size of 10-30 nm can be obtained via hydrothermal treatment for different time at 180 °C. The luminescence intensity of Eu3+-doped NaLa(WO4)2 nanoparticles depended on the size of the nanoparticles. The bright upconversion luminescence of the 2 mol% Er3+ and 20 mol% Yb3+ codoped NaLa(WO4)2 nanoparticles under 980 nm excitation could also be observed. The Yb3+-Er3+ codoped NaLa(WO4)2 nanoparticles prepared by the hydrothermal treatment at 180 °C and then heated at 600 °C shows a 20 times stronger upconversion luminescence than those prepared by hydrothermal treatment at 180 °C or by hydrothermal treatment at 180 °C and then heated at 400 °C.
Investigation of desolvation process in lanthanide dinicotinates
Lyszczek,Iwan
, p. 633 - 639 (2011)
The desolvation process in lanthanide pyridine-3,5-dicarboxylates of the formulae [Tb2pdc3(dmf)2]?dmf (1), [Ho 2pdc3(dmf)2]?dmf (2), [Erdc 3(dmf)2]?dmf (3), and [Yb2pdc 3(dmf)2]?dmf (4) where pdc-C5H 3N(COO) 2 2-, dmf-N,N′-dimethylformamide) has been investigated by means of the TG-DSC, TG-FTIR, IR and XRD methods. Heating of the complexes in the range 30-260 °C lead to evolution of weakly bonded dmf molecules included in the channels as well those directly bonded with lanthanide atoms. The kinetic analysis revealed a multistep desolvation pattern.
Synthesis, structure, thermal and luminescent behaviors of lanthanide-Pyridine-3,5-dicarboxylate frameworks series
?yszczek, Renata
, p. 120 - 127 (2011/01/08)
The isostructural series of lanthanide pyridine-3,5-dicarboxylates of the formula [Ln2pdc3(dmf)2]·(dmf) x(H2O)y where Ln are lanthanides from La(III) to Lu(III); pdc2--C5/s
Synthesis, structure, and antibacterial properties of ternary rare-earth complexes with o-methylbenzoic Acid and 1,10-phenanthroline1
Chen,Wang,Yang,Zhao,Zhang,Wang,Zhao
, p. 541 - 546 (2009/12/02)
Ternary rare-earth complexes with o-methylbenzoic acid (o-MBA) and 1,10-phenanthroline (Phen) Ln2(o-MBA)6(Phen)2 ? nH2O(n = 0, 1) (Ln = La, Pr, Y, Yb) were synthesized and characterized by elemental analysis, IR
Thermochemical properties of the rare earth complexes with pyromellitic acid
Wang, Lijun,Liu, Fei,Yang, Xuwu,Wang, Xiaoyan,Liu, Ruiping,Zhao, Sa,Chen, Sanping
, p. 43 - 46 (2009/05/30)
Fourteen rare earth complexes with pyromellitic acid were synthesized and characterized by means of chemical and elemental analysis, and TG-DTG. The constant-volume combustion energies of complexes, ΔcU, were measured by a precise rotating-bomb
Solubility in the LaCl3-YbCl3-HCl-H2O system at 25°C
Knyazeva,Skiba,Voskoboinikov
, p. 430 - 433 (2008/10/09)
Solubility has been studied in the LaCl3-YbCl 3-HCl-H2O water-salt system at 25°C along the (40 ± 0.2)% HCl section; this is a eutonic-type system. The composition of the eutonic solution is as follows (wt %): LaCl3 ? 7H 2O, 4.67, YbCl3 ? 6H2O, 0.37; HCl, 37.98; and H2O, 56.98.
Coordination polymers based on inorganic lanthanide(III) sulfate skeletons and an organic isonicotinate N-oxide connector: Segregation into three structural types by the lanthanide contraction effect
He, Zheng,Gao, En-Qing,Wang, Zhe-Ming,Yan, Chun-Hua,Kurmoo, Mohamedally
, p. 862 - 874 (2008/10/09)
Fourteen three-dimensional coordination polymers of general formula [Ln(INO)(H2O)(SO4)]n, where Ln = La, 1·La; Ce, 2·Ce; Pr, 3·Pr; Nd, 4·Nd; Sm, 5·Sm; Eu, 6·Eu; Gd, 7·Gd; Tb, 8·Tb; Dy, 9·Dy; Ho, 10·Ho; Er, 11·Er; Tm, 12·Tm; Yb, 13·Yb; and Lu, 14·Lu; INO = isonicotinate-N-oxide, have been synthesized by hydrothermal reactions of Ln3+, MnCO3, MnSO4·H 2O, and isonicotinic acid N-oxide (HINO) at 155 °C and characterized by single-crystal X-ray diffraction, IR, thermal analysis, luminescence spectroscopy, and the magnetic measurement. The structures are formed by connection of layer, chain, or dimer of Ln-SO4 by the organic connector, INO. They belong to three structural types that are governed exclusively by the size of the ions: type I for the large ions, La, Ce, and Pr; type II for the medium ions, Nd, Sm, Eu, Gd, and Tb; and type III for the small ions, Dy, Ho, Er, Tm, Yb, and Lu. Type I consists of two-dimensional undulate Ln-sulfate layers pillared by INO to form a three-dimensional network. Type II has a 2-fold interpenetration of 3D herringbone networks, in which the catenation is sustained by extensive π-π interactions and O-H...O and C-H...O hydrogen bonds. Type III comprises one-dimensional chains that are connected by INO bridges, resulting in an α-Po network. The progressive structural change is due to the metal coordination number decreasing from nine for the large ions via eight to seven for the small ions, demonstrating clearly the effect of lanthanide contraction. The sulfate ion acts as a μ4- or μ3-bridge, connecting two, three, or four metals, and is both mono- and bidentate. The INO ligand acts as a μ3- or μ2-bridge with carboxylate group in syn-syn bridging or bidentate chelating mode. The materials show considerably high thermal stability. The magnetic properties of 4·Nd, 6·Eu, 7·Gd, and 13·Yb and the luminescence properties of 6·Eu and 8·Tb are also investigated.
