Solvothermal synthesis, crystal structure, and properties of lanthanide-organic frameworks based on thiophene-2,5-dicarboxylic acid

Abstract

A series of lanthanide-organic framework coordination polymers, {[La(2)(TDC)(2)(NO(3))(H(2)O)(4)](OH)·5H(2)O}(n) (1) and [Ln(TDC)(NO(3))(H(2)O)](n) (TDC = thiophene- 2, 5- dicarboxylic acid; Ln = Nd(2), Sm(3), Eu(4), Gd(5), Tb(6), Dy(7), Ho(8), Er(9), Yb(10)) have been synthesized by solvothermal reaction and characterized by elemental analysis, FT-IR, TG analysis, single-crystal X-ray diffraction and power X-ray diffraction. The single-crystal X-ray diffraction analysis results show that 1 displays a 3-D porous framework with (3,7)-connected {4(10).6(11)}{4(3)} topology. The compounds 2-10 crystallized in the same P2(1)/c space group and exhibits a (3,6)-connected {4.6(2)}(2){4(2).6(10).8(3)} topology, Right-handed and left-handed helical chains coexist in the 2-D layer structure. The luminescence properties of 2-10 and the magnetic properties of 5,7,8,9 were investigated.

Coordination polymers of lanthanide complexes with benzene dicarboxylato ligands

“…5a). 34,35 The emission spectrum of 4 with an excitation at 350 nm shows, as anticipated, four peaks at 578, 590, 613 and 696 nm, respectively, assignable to the transitions from deactivation of the 5 D 0 excited state to the corresponding 7 F J (J = 0, 1, 2, 4), characteristic of a Eu(III) ion (Fig. 5b).…”

Luminescent and magnetic bifunctional coordination complex based on a chiral tartaric acid derivative and europium

“…7 F 1 transition, indicating that the Eu 3+ ion in (I) should form a noncentrosymmetric coordination environment without an inversion centre, consistent with the results of the structural analysis. No emission from higher excited states (such as 5 D 1 ) is observed, due to cross-relaxation processes (Sun et al, 2011). The result clearly indicates that the energy can be effectively transferred from the ligand to the Eu 3+ centre during the luminescence process.…”

Construction of a series of rare earth metal-organic frameworks supported by thiophenedicarboxylate linker: Synthesis, characterization, crystal structures and near-infrared/visible luminescence

“…It is important to emphasize that several previous reports of Metal-Organic Frameworks of rare earths with this ligand, discuss briefly the photophysical investigations presenting only the excitation/emission spectra [27][28][29][30][31][32][33][34]. The compounds studied in this work, together with the congeners reported by our group [11][12][13] presents a more detailed study of energy transfer process.…”

“…The literature reports similar REMOFs containing 2,5-tdc 2À anion [11][12][13][27][28][29][30][31][32][33][34], with these species being highly crystalline, allowing the structural determination through single crystal X-ray diffraction analysis. However, in the present case, the crystallization process for the {[Pr 2 (2,5-…”