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

Abstract

Three 2D new coordination polymers Co2(L1)2(1,10-Phenanthroline)2(DMF)0.5(H2O) (1), (H2L1 = Pyridine-3,5-dicarboxylic acid) Co(L1)(2,2-bipyridine) (2), and Co(L2)(2,2-bipyridine) (DMF) (3) (H2L2 = Pyridine-3,4-dicarboxylic acid) were synthesized through a solvothermal reaction of cobalt nitrate and pyridine carboxylic acid ligand with the auxiliary ligand (1,10-Phenanthroline or 2,2-bipyridine). They were characterized by X-ray diffraction and elemental analysis, infrared spectroscopy, thermogravimetry analysis, and magnetism. Compounds 1–3 featured 2D hexagonal (6,3) networks which linked into 3D supramolecular architectures through π–π interaction. In addition, compounds 1 and 2 showed the antiferromagnetic exchange interactions, and the magnetic property of compound 3 exhibited ferromagnetic exchange interactions.

Coordination Polymers from Biphenyl-Dicarboxylate Linkers: Synthesis, Structural Diversity, Interpenetration, and Catalytic Properties

“…Both six-coordinate Co1 centers display a distorted {CoN 2 O 4 } octahedral environment that is constructed from two carboxylate oxygen atoms from two μ 2 -H 2 L 1 2– blocks, a pair of N phen atoms, and two water ligands. The distances of Co–N [2.123(2)–2.132(2) Å] and Co–O [2.042(2)–2.184(2) Å] bonds agree with typical literature data. ,, Two H 2 L 1 2– ligands act as μ 2 -linkers via monodentate carboxylate groups (Scheme , mode I), thus assembling two Co1 centers to give a cyclic Co 2 complex with a Co···Co separation of 14.056(2) Å (Figure a). Such Co 2 molecular units are involved in an intermolecular H-bonding forming a 2D network (Figure b) with an sql topology. , …”

“…The distances of Co–N [2.123(2)–2.132(2) Å] and Co–O [2.042(2)–2.184(2) Å] bonds agree with typical literature data. 21 , 31 , 70 Two H 2 L 1 2– ligands act as μ 2 -linkers via monodentate carboxylate groups ( Scheme 2 , mode I), thus assembling two Co1 centers to give a cyclic Co 2 complex with a Co···Co separation of 14.056(2) Å ( Figure 1 a). Such Co 2 molecular units are involved in an intermolecular H-bonding forming a 2D network ( Figure 1 b) with an sql topology.…”

A Multifunctional 3D Supermolecular Co Coordination Polymer With Potential for CO2 Adsorption, Antibacterial Activity, and Selective Sensing of Fe3+/Cr3+ Ions and TNP

“…The single-crystal X-ray data were collected using the X-ray diffraction technique and the results showed that crystallization of compound 1 in the monoclinic space group C2/c and the presence of two independent Co. atoms, one 2,2′bipy molecule, and one linker (L 3− ) in the asymmetric unit of 1 (Supplementary Figure S1). The Co1 atom is involved in coordination with six O atoms of the carboxylates of 6 L 3− ligands, showing an octahedral configuration (Co-O 2.053-2.108 Å), the six-coordinated Co2 or its symmetryrelated Co3 atom displays a distorted octahedral configuration, which is bonded with four carboxylate O atoms from 3 L 3− ligands, and 2 N atoms from one 2,2′-bipy molecule, Co2-O and Co2-N or Co3-O and Co3-N are in the range of 2.007-2.183 Å and 2.085-2.115 Å, respectively (Figure 1) (Mistri et al, 2017;Zhou et al, 2019), the bonding mode of the carboxylate toward the six Co 2+ ions is μ 6 -η 1 :η 2 :η 1 :η 1 :η 2 :η 0 (Supplementary Scheme 1 in the Supplementary Information), the adjacent Co1-Co3 atoms (Co•••Co. separation, 3.168-6.337 Å) are united together by six carboxylates to form trinuclear Co.(II) clusters, each cluster can be connected to the adjacent ones to evolve a unique bylayer 2D framework, which contains quadrangle grids with a size of 7.0 Å × 6.4 Å running along the b-axis (atom-to-atom distance) (Figure 2).…”

Selective and efficient detection of Pb2+ in aqueous solution by lanthanoid-organic frameworks bearing pyridine-3,4-dicarboxylic acid and glutaric acid

“…To overcome this problem, the design of highly efficient lanthanoid complexes with organic ligand is important, which serves not only as an antenna or sensitizer but also shields the lanthanoid(III) ion from vibrational coupling and increases light absorption. 18 Furthermore, the π-electron conjugated system of organic ligands such as pyridine-3,4-dicarboxylic acid, pyridine-2,6dicarboxylic acid, and pyrazine-2,3-dicarboxylic acid is beneficial for the formation of stable supramolecular structures. 19 To detect specific metal ions such as Cd 2+ , Hg 2+ , Ni 2+ , and Mn 2± , a wide range of fluorescent MOFs have been explored, although the sensitive and selective detection of heavy metal ions has been scarce.…”