Synthesis, Upconversion Luminescence and Magnetic Properties of New Lanthanide–Organic Frameworks with (4³)₂(4⁶,6⁶,8³) Topology

Abstract

The synthesis and crystal structures of three new lanthanide–organic frameworks [Ln(pza)(OH)(H2O)]n (Ln = Y(1), Er(2), Yb(3); H2pza = 2,3‐pyrazinedicarboxylic acid) with helical chains and novel 2D (43)2(46,66,83) topology are reported. The topology is obtained by simplifying the dinuclear metal core as a six‐connected node and the ligand as a three‐connected linker. The upconversion property measurement gives green and red emissions coming from two‐photon excitation of Y: Er, Yb codoped coordination polymer and arising from ErIII transitions of 4S3/2/2H11/2→4I15/2 and 4F9/2→4I15/2. The magnetic properties of complexes 2 and 3 are also studied.(© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2007)

Group 3 Elements and Lanthanide Metals

“…The use of such linkers led to different new framework structures of varying dimensionality based on the versatile binding modes of the carboxylate groups. Differently connected metal nodes arise from such structures, such as four- [117], six- [107], seven-and eight- [160], and even 12-fold connected nodes [6] (see Figure 9.1).…”

“…Ferromagnetic and antiferromagnetic interactions [91,92,107,[161][162][163] were reported in addition to the single-ion paramagnetic behavior and typically refer to the respective lanthanide ions. The series of Ln-MOFs {[Ln 2 (Hpimda) 2 ( 4 -C 2 O 4 )⋅2H 2 O]⋅4H 2 O} n (Hpimda = 2-propyl-1H-imidazole-4,5-dicarboxylate) is a prominent example, showing weak ferromagnetic ordering for Tb, Dy, and Ho as well as antiferromagnetic coupling for Er [91].…”

Synthesis and characterization of two novel coordination polymers based on the rigid 1H-1,2,3-triazole-4,5-dicarboxylic acid ligand

“…In general, using rigid multidentate organic ligands containing N-and O-donors makes it possible to direct the self-assembly process, to a certain extent. In recent years, some rigid heterocyclic dicarboxylic acids such as pyridine-3,4-dicarboxylic acid, pyrazine-2,3-dicarboxylic acid and imidazole-4,5-dicarboxylic acid have received considerable attention and have been used to react with metal centers to form multidimensional metal coordination polymers with intriguing topological structures [8][9][10][11][12][13]. 1H-1,2,3-triazole-4,5-dicarboxylic acid (H 3 TDA) is a multidentate N-and O-donor ligand that can be deprotonated to generate H 2 TDA  , HTDA 2 , and TDA 3 with versatile metal-binding and hydrogen-bonding capabilities.…”

3-D supramolecular frameworks assembled by lanthanide binuclear molecules based on 1,2-phenylenedioxydiacetic acid and 1,10-phenanthroline

“…Carboxylate groups act as diverse coordination modes and are useful in the construction of lanthanide complexes with 1-D polymeric chain, 2-D, or 3-D network structures. Additionally, these ligands can sensitize Ln(III) ions emission [9][10][11][12][13][14][15][16][17][18][19]. Thereinto, benzene-polycarboxylates have been widely used as ligands due to their diversity, multifunctionality, and overall stability, which may lead to the fascinating structures, chemically and thermally reasonable stability of complexes.…”

“…The introduction of 1,10-phenanthroline (phen) as second ligand in complexes has yielded a variety of complexes and is helpful to increase the thermal stability and enhance the luminescent properties of complexes due to its rigidity and steric constraint. Therefore, many lanthanide coordination polymers based on benzene-polycarboxylates or phen-containing complexes have been reported [13][14][15][16][17][18][19][20].…”