Synthesis, Crystal Structure and Properties of a New Lanthanide Pyridine-2,4,6-tricarboxylato Coordination Polymer

2011 ◽  
Vol 66 (6) ◽  
pp. 570-576
Author(s):  
Jian-Li Lin ◽  
Wei Xu ◽  
Li Zhao ◽  
Yue-Qing Zheng
Keyword(s):  
Crystal Structure ◽  
Magnetic Properties ◽  
Coordination Polymer ◽  
Visible Region ◽  
Tricarboxylic Acid ◽  
Structure And Properties ◽  
Temperature Dependent ◽  
Coordination Modes ◽  
Temperature Range ◽  
Trigonal Prismatic

A new lanthanide pyridine-2,4,6-tricarboxylato coordination polymer, [Dy2(H2O)5(ptc)2]·H2O (H3ptc = pyridine-2,4,6-tricarboxylic acid), was hydrothermally synthesized. The complex exhibits both mono-capped square antiprismatic DyNO8 chromophores and 4,4ʹ-bicapped trigonal prismatic DyNO7 chromophores, which are interconnected through ptc3− anions in μ3η6 and μ4η6 coordination modes to achieve a new 3D MOF of an unprecedented topology of (4 · 63 · 82)(63) type. This Dy(III) complex exhibits a characteristic luminescence in the visible region upon excitation at 300 nm. The temperature-dependent magnetic properties of the Dy(III) complex were investigated in the temperature range of 2 - 300 K.

scholarly journals Poly[[pentaaqua(μ4-pyridine-2,4,6-tricarboxylato)(μ3-pyridine-2,4,6-tricarboxylato)diterbium(III)] monohydrate]

2012 ◽  
Vol 68 (8) ◽  
pp. m1133-m1134 ◽  
Author(s):  
Xiao-Ke Yu ◽  
Hong-Lin Zhu
Keyword(s):  
Crystal Structure ◽  
Rare Earth ◽  
Coordination Polymer ◽  
Hydrogen Bonds ◽  
Three Dimensional ◽  
Tricarboxylic Acid ◽  
The Other ◽  
Coordination Modes ◽  
Trigonal Prismatic

The three-dimensional title coordination polymer, {[Tb2(C8H2NO6)2(H2O)5]·H2O}n, was hydrothermally synthesized by reacting the corresponding rare-earth salt with pyridine-2,4,6-tricarboxylic acid (H3ptc). There are two independent TbIIIatoms in the structure, one of which is nine-coordinated, forming a monocapped NO8square-antiprism and the other is eight-coordinated exhibiting a 4,4-bicapped NO7trigonal–prismatic environment. The complex units are interconnected through the ptc3−anions acting in different coordination modes, resulting in a three-dimensional coordination polymer. The crystal structure features extensive O—H...O hydrogen bonds.

scholarly journals Effect of Nd, Pr substitutional atoms on the magnetic and magnetostrictive properties in (Tb-Dy)(Fe-Co)2 Laves phases

2021 ◽  
Vol 2103 (1) ◽  
pp. 012196
Author(s):  
G A Politova ◽  
M A Ganin ◽  
A B Mikhailova ◽  
D A Morozov ◽  
K E Pankov ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Magnetic Properties ◽  
Laves Phase ◽  
Type Structure ◽  
Partial Substitution ◽  
Laves Phases ◽  
Temperature Range ◽  
Homogenizing Annealing ◽  
Arc Melting ◽  
Magnetostrictive Materials

Abstract Polycrystalline TbxDy1-xR0.1Fe2-zCoz (R = Nd, Pr, x = 0.2, 0.3; z = 0, 1.3) cubic Laves phase alloys with MgCu2-type structure were prepared by arc melting followed by homogenizing annealing. The crystal structure, magnetic properties, and magnetostriction have been investigated. Compounds with high values of magnetostrictive susceptibility were found in the temperature range 150-300 K. Compounds with partial substitution of cobalt for iron demonstrate a change in the sign of anisotropic magnetostriction. This work continues the search for magnetostrictive materials with inexpensive neodymium and praseodymium.

Structure and Magnetic Properties of a Dinuclear Complex with Iron(III) in Octahedral and Pyramidal Coordination

1994 ◽  
Vol 49 (9) ◽  
pp. 1239-1242 ◽  
Author(s):  
Ayhan Elmali ◽  
Yalcin Elerman ◽  
Ingrid Svoboda ◽  
Hartmut Fuess ◽  
Klaus Griesar ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Magnetic Properties ◽  
Magnetic Susceptibility ◽  
Magnetic Moment ◽  
Effective Magnetic Moment ◽  
Dinuclear Complex ◽  
Monoclinic Space Group ◽  
Temperature Dependent ◽  
Space Group ◽  
Binuclear Unit

[FeL(MeOH)Cl]2 (L = N-(2-hydroxyphenyl)salicylaldimine) was synthesized and its crystal structure determined, [C27H20N 2O5Cl2Fe2], monoclinic, space group P21/c, a = 9.528(1), b = 7.684(1), c = 18.365(2) Å, β = 109.83(1)°, V = 1264.8 Å3, Z = 2. Two identical [FeL(MeOH)Cl] fragments, related by an inversion centre, are combined by the two bridging O atoms, to form a binuclear unit. The iron(III) centers are separated by 3.163(2) Å and weakly antiferromagnetically coupled (J = -8 .0 (1 ) cm-1), which follows from temperature - dependent magnetic susceptibility measurements in the range 4.2 to 288 K. The effective magnetic moment per iron(III) is μeff = 7.4 μB at 288 K

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