10025-84-0Relevant articles and documents
Hydrothermal synthesis and structural studies of novel 2-D lanthanide coordination polymers with phthalic acid
Wan, Yonghong,Jin, Linpei,Wang, Kezhi,Zhang, Liping,Zhenga, Xiangjun,Lub, Shaozhe
, p. 1590 - 1596 (2002)
This paper presents four lanthanide coordination polymers, [Ln2(BDC)3(H2O)]n (Ln = La, 1; Ln = Eu, 2; Ln = Tb, 3; BDC = 1,2-benzenedicarboxylate) and [Yb4(BDC)6(H2O)2]n (4) prepared by the hydrothermal technique. They are all 2-D infinite structures with BDC anions connecting adjacent metal ions. In complex 1, La(III) ions are eight- and nine-coordinated, and all La(III) ions are coplanar in the 2-D structure. In complexes 2 and 3, Eu(III) and Tb(III) ions are also eight- and nine-coordinated, but they are distributed in a wave-like 2-D network. In complex 4, the Yb(III) ions have four different coordination numbers (6, 7, 8 and 9), which are rarely found in one lanthanide complex. Both the coordination numbers and the arrangement of Ln atoms in these coordination polymers show the lanthanide contraction. In the four complexes, all the oxygen atoms of BDC take part in coordination with Ln(III) ions, adopting tetra-, penta- and hexadentate coordination modes for the phthalate anions. The luminescent properties of complex 2 have been investigated and the results for the explanation of the chemical environment of the Eu(III) ion are consistent with the X-ray analysis.
Struktur der hexagonalen Mofifikation von Lanthan(III) trichlorid trihydrat
Reuter, Gert,Frezen, Gerlinde
, p. 844 - 845 (1994)
The crystal structure of the title compound (LaCl3*3H2O) in its hexagonal modification has been determined from 141 independent observed reflections.Each unit cell consists of one formula unit of LaCl3*3H2O, forming straight chains along .The parallel chains create a structure with alternating Cl- and La3+/H2O layers in the direction.The coordination geometry of the La3+ cation can be described as a trigonal prism of bridging Cl- anions with terminal water molecules capping each rectangular face of the prism.The coordination number of the La3+ cation is nine.
XPS and Chiroptical Studies on Lanthanide(III) Complexes of Hydroxylamine and Sodium D-Camphor-β-sulfonate
Ma,Wang,Shi
, p. 1763 - 1774 (2003)
Six new chiral complexes LnL3 (Ln = La(III), Pr(III), Nd(III), Sm(III), Eu(III) and Gd(III)) with an optically active Schiff base ligand (HL) derived from sodium D-camphor-β-sulfonate and hydroxylamine were synthesized and characterized by elemental analyses, molar conductance, IR, XPS (X-ray photoelectron spectroscopy), electronic spectra, 1H NMR, magnetic susceptibility measurements and thermal methods. It was found that the complexes behave as non-electrolytes in CH3OH and in DMSO and possess the stoichiometric ratio of Ln:C:N:O:S = 0.33:10.1:1.0:4.0:1.0 which is consistent with the analytical data. Their dominant conformers were determined by CD spectra. A six-coordinated model is proposed for these complexes.
Synthesis and structural characterization of new lanthanide coordination polymers with nitrilotriacetic acid
Huang, Liang,Zhang, Li-Ping,Jin, Lin-Pei
, p. 121 - 126 (2004)
Reported herein are the hydrothermal synthesis and crystal structures of four lanthanide coordination polymers with nitrilotriacetic acid (H 3NTA) [Ln(NTA)(H2O)]n (Ln=La, 1; Pr, 2; Nd, 3; Eu, 4). Despite similar syntheses, compounds 1 to 4 show transformation in coordination mode of NTA and coordination number of Ln3+ duo to lanthanide contraction. The Ln(III) ions in 1 and 2 are nine-coordinated and connected through octadentate bridging ligands (NTA) to form a three-dimensional network. The Ln(III) ions in 3 and 4 are eight-coordinated and bridged by heptadentate bridging ligands (NTA) to form an extended two-dimensional layer structure, which further construct a three-dimensional supramolecular structure via coordination bond and three-centered hydrogen bonding between adjacent layers.
Solubility in the LaCl3-LnCl3-HCl-H2O (Ln = Pr, Nd) systems at 25°C
Knyazeva,Skiba,Serba
, p. 592 - 595 (2012)
The solubility in the quaternary water-salt systems LaCl 3-NdCl3-HCl-H2O (1) and LaCl3- PrCl3-HCl-H2O (2) at 25°C was studied in the section of 40 wt % hydrochloric acid, a system with a eutonic discontinuity. The composition at the point of discontinuity for the eutonic solution is the following. In system 1: 4.67 wt % LaCl3 · 7H2O, 0.37 wt % PrCl3 · 7H2O, 37.98 wt % HCl, and 56.98 wt % H2O; in system 2: 4.37 wt % LaCl3 · 7H 2O, 0.93 wt % NdCl3 · 6H2O, 37.88 wt % HCl, and 56.82 wt % H2O.
Synthesis, structure, thermal and luminescent behaviors of lanthanide-Pyridine-3,5-dicarboxylate frameworks series
?yszczek, Renata
, p. 120 - 127 (2010)
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
Mixed sandwiches of group 3 elements: synthesis and UPS studies of pentamethylcyclopentadienylcyclooctatetraenescandium, -yttrium and -lanthanum
Bruin, P.,Booij, M.,Teuben, J. H.,Oskam, A.
, p. 17 - 24 (1988)
The mixed sandwich complexes Cp*MCOT (Cp* = η5-C5Me5; M=Sc, Y, La; COT = η8-C8H8) have been prepared and characterized.IR spectra indicate that in the solid state the La compound is polymeric (Cp*LaCOT)n, with cyclotetraene ligands.The complexes are strong Lewis acids and form bridging adducts Cp*MCOT.THF.For M = La the adduct has been isolated.The UPS spectra of Cp*MCOT are nearly identical with only minor differences in the ionizations from the highest e2(COT) and e1(Cp*) orbitals; this is interpreted as a strong indication that the bonding in the complexes is virtually completely ionic.
Hydrothermal synthesis and characterization of novel lanthanide 2,2′-diphenyldicarboxylate complexes
Wang, Yi-Bo,Zheng, Xiang-Jun,Zhuang, Wen-Juan,Jin, Lin-Pei
, p. 1355 - 1360 (2003)
Lanthanide complexes with a one-dimensional chain, [Ln2(dpdc)3(H2O)2]n [Ln = La (1), Pr (2), Eu (3), Tb (4); dpdc = 2,2′-diphenyldicarboxylate] were obtained by hydrothermal reaction of lanthanide(III) chlorides and 2,2′-diphenyldicarboxylic acid, and characterized by X-ray diffraction. The crystal structure data reveal that they are isostructural. In the asymmetric unit, the two Ln3+ ions are both eight-coordinate but they have different coordination environments. Lanthanide ions arranged in a zigzag manner are bridged by the dpdc ligands into a 1-D chain, while the structure appears like a pinwheel viewed along the c axis. In these complexes, 2,2′-diphenyldicarboxylate anions exhibit tetradentate and pentadentate coordination modes. A laser-induced high-resolution spectrum (resolution: 0.2 cm-1) of 3 was obtained, which shows two Eu3+ sites in 3. This is in agreement with the results of single-crystal X-ray diffraction studies of 3. Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2003.
The template synthesis and characterization of new mono- and dinuclear Schiff base complexes of lanthanide(III) ions
Nawrocka, Justyna,Patroniak, Violetta
, p. 159 - 162 (2004)
As a result of [1 + 2] Schiff base condensation in reaction between 2,6-diacetylpyridine and 3,6-dioxaoctane-1,8-diamine in the presence of lanthanide(III) ions (Ln = La3+, Pr3+, Nd3+, Eu3+, Gd3+, Tb3+, Dy3+, Ho 3+), the new mono- and dinuclear architectures containing ligand with N5O4 set of donor atoms with terminal amine groups were formed. The complexes were clear on the basis of the spectroscopic and thermogravimetric data and microanalyses.
Facile solid-state chemical synthesis of novel ternary lanthanide complexes at room temperature
Yang, Xiao-Fei,Zhang, Rong-Xian,Yao, Fan,Ouyang, Wei-Meng
, p. 37 - 41 (2012)
This paper reports a facile one-step synthesis of two ternary lanthanide complexes via room temperature solid-state reactions of lanthanide chloride hydrates with two ligands, potassium sorbate (PS), and 8-hydroxyquinoline (8-hq). The structural features, composition, and the morphologies of two complexes are characterized by elemental analysis, UV-Vis, FT-IR, XRD, SEM, and EDX. The thermal property of two ternary lanthanide complexes was also investigated. UV-Vis and FT-IR results confirm the coordination of lanthanide ion with two ligands. XRD results show that signals of complexes are not from reactants, and are believed to originate from the corresponding ternary lanthanide complex.
