From 1D to 3D lanthanide coordination polymers constructed with pyridine-3,5-dicarboxylic acid: synthesis, crystal structures, and catalytic properties

Abstract

La 1, Pr 2, Sm 3), [(CH 3 ) 2 NH 2 ][Ln 2 (PDC) 3 (HCOO)(H 2 O) 3 ]$2H 2 O (type II) (Ln ¼ Tb 4, Ho 5) and [Ln(HPDC) 3 (H 2 O) 2 ]$H 2 O (type III) (Ln ¼ Er 6, Lu 7) (H 2 PDC ¼ pyridine-3,5-dicarboxylic acid), have been successfully synthesized by the solvothermal reaction of pyridine-3,5-dicarboxylic acid (H 2 PDC) with the corresponding lanthanide nitrate. Compounds 1-3 are isomorphous and all crystallize in triclinic space group P 1, showing a 3D microporous framework of pcu topology with square channels along the b-axis.Isostructural compounds 4 and 5 show the same 2D layer network of (4,4)-grid in the monoclinic P2 1 /c space group. Isomorphic 6 and 7 crystallize in the monoclinic Cc space group and present 1D zigzag chains which expand to a 3D supramolecular structure through p/p stacking interactions. The structural diversity of these three classes of compounds may be attributed to the effect of lanthanide contraction. They were characterized by infrared spectra (IR), elemental analysis (EA), thermogravimetric analysis (TGA), powder X-ray diffraction (PXRD), and X-ray single crystal diffraction. Furthermore, the catalytic properties of these compounds were investigated and experiments revealed that compounds 1-3 show size-selective catalytic performance for cyanosilylation reactions and could be reused without losing their catalytic activity.

Bifunctional 2D Cd(II)-Based Metal–Organic Framework as Efficient Heterogeneous Catalyst for the Formation of C–C Bond

“…We have been studying the design of functionalized MOFs and their application for heterogeneous catalysis. − As reported in our previous work, we obtained a polyhedral metal–organic framework, [Eu 2 (PDC) 3 ] (H 2 PDC = pyridine-3,5-dicarboxylic acid), which could effectively accelerate the cyanosilylation reaction . By utilizing a versatile Cu II /Cu I metal–organic framework as catalyst, three-component coupling reactions of diisopropylamine, tosylazide, and aromatic alkynes can be promoted as well as the oxidation of benzylic compounds .…”

Synthesis, Crystal Structures, and Magnetic Properties of Three Cobalt(II) Coordination Polymers Constructed from 3,5-Pyridinedicarboxylic Acid or 3,4-Pyridinedicarboxylic Acid Ligands

“…Taking into account the reported works, in this paper we chose the symmetrical pyridine-3,5-dicarboxylic acid and asymmetrical pyridine-3,4-dicarboxylic acid as the ligands because these two ligands can be deprotonated to form HL − and L 2− anions which have the flexible and versatile coordination modes to bridge metal ions. Furthermore, the π-electric conjugated system of the pyridine dicarboxylic acid and auxiliary ligands (1,10-Phenanthroline and 2,2-bipyridine) are beneficial for the formation of stable supramolecular structures [15,[21][22][23]. Meanwhile we chose cobalt nitrate as the metal source, and thus they could form both discrete and consecutive new Co compounds with magnetic behavior, having potential applications in magnetic materials [24,25].…”

Mesoporous Mn3O4/C Microspheres Fabricated from MOF Template as Advanced Lithium-Ion Battery Anode

“…Particularly, metal–organic frameworks (MOFs), constructed from organic ligands and metal ions or metal clusters, are emerging as a porous organic–inorganic hybrid material with tunable porosities and large surface areas. − In recent years, MOFs have been used as either precursors or templates to form metal oxides and carbon materials via thermal treatment. , Despite these great successes, it still remains a significant challenge to develop promising electrode materials with reversible and maximum lithium storage. In our previous work, we had synthesized a Pb-MOF, in which the organic moiety could provide probable Li + binding sites for the reversible lithium storage .…”