New coordination polymers from 1D chain, 2D layer to 3D framework constructed from 1,2-phenylenediacetic acid and 1,3-bis(4-pyridyl)propane flexible ligands

New Coordination Polymers of Selected Lanthanides with 1,2-Phenylenediacetate Linker: Structures, Thermal and Luminescence Properties

Solvothermal reactions of lanthanide (III) salts with 1,2-phenylenediacetic acid in N,N'-dimethylformamide (DMF) solvent lead to the formation of the metal complexes of the general formula Ln₂(1,2-pda)₃(DMF)₂, where Ln(III) = Pr(1), Sm(2), Eu(3), Tb(4), Dy(5), and Er(6), 1,2-pda = [C₆H₄(CH₂COO)₂]^2-. The compounds were characterized by elemental analysis, powder and single-crystal X-ray diffraction methods, thermal analysis methods (TG-DSC and TG-FTIR), infrared and luminescence spectroscopy. They exhibit structural similarity in the two groups (Pr, Sm, and Eu; Tb, Dy, and Er), which was reflected in their thermal behaviours and spectroscopic properties. Single-crystal X-ray diffraction studies reveal that Sm(2) and Eu(3) complexes form 2D coordination polymers with four crystallographically independent metal centers. Every second lanthanide ion is additionally coordinated by two DMF molecules. The 1,2-phenylenediacetate linker shows different denticity being: penta- and hexadentate while carboxylate groups exhibit bidentate-bridging, bidentate-chelating, and three-dentate bridging-chelating modes. The infrared spectra reflect divergence between these two groups of complexes. The complexes of lighter lanthanides contain in the structure coordinated DMF molecules, while in the structures of heavier complexes, DMF molecules appear in the inner and outer coordination sphere. Both carboxylate groups are deprotonated and engaged in the coordination of metal centers but in different ways in such groups of complexes. In the groups, the thermal decomposition of the isostructural complexes occurs similarly. Pyrolysis of complexes takes place with the formation of such gaseous products as DMF, carbon oxides, ortho-xylene, ethers, water, carboxylic acids, and esters. The complexes of Eu and Tb exhibit characteristic luminescence in the VIS region, while the erbium complex emits NIR wavelength.

Synthesis and crystal structure of a new coordination polymer based on lanthanum and 1,4-phenyl-enedi-acetate ligands

Reaction in gel between the sodium salt of 1,4-phenyl-enedi-acetic acid (Na2C10O4H8-Na2 p-pda) and lanthanum chloride yields single crystals of the three-dimensional coordination polymer poly[[tetra-aqua-tris-(μ-1,4-phenyl-enedi-acetato)-dilanthanum(III)] octa-hydrate], {[La2(C10H8O4)3(H2O)4]·8H2O}∞. The LaIII coordination polyhedron can be described as a slightly distorted monocapped square anti-prism. One of the two p-pda2- ligands is bound to four LaIII ions and the other to two LaIII ions. Each LaIII atom is coordinated by five ligands, thereby generating a metal-organic framework with potential porosity properties.

Crystal structure of poly[(μ2-1,4-bis((2-ethyl-1H-benzo[d]imidazol-1-yl)methyl)benzene-κ2N:N′)(μ2-isophthalato-κ4O,O′:O′′,O′′′)cadmium(II)], C34H30N4O4Cd

C34H30N4O4Cd, monoclinic, P21/c (no. 14), a = 10.382(2) Å, b = 18.102(4) Å, c = 18.449(5) Å, β = 123.32(2)°, V = 2897.3(12) Å3, Z = 4, Rgt(F) = 0.0540, ωRref(F2) = 0.1069, T = 293(2) K.

Crystal structure of poly[μ4-(4-(carboxylatomethyl)benzoato-κ4 O:O′:O′′:O′′′)-(2-(4-(1H-imidazol-1-yl)phenyl)-1H-benzo[d]imidazole-κN)manganese(II)] [Mn(C9H6O4)(C16H12N4)]

C25H18N4O4Mn, orthorhombic, P212121, a = 7.9366(11) Å, b = 10.2389(15) Å, c = 26.313(4) Å, V = 2138.3(5) Å3, Z = 4, R gt(F) = 0.0385, wR ref(F 2) = 0.0832, T = 296(2) K.

Crystal structure of poly-[bis(μ 3-5-hydroxyisophtalato-κ3 O:O′:O′′)(μ 2-1,4-bis(2-ethylbenzimidazol-1-ylmethyl)benzene-κ2 N:N′)dizinc(II)], C40H30N4O5Zn2

C40H30N4O5Zn2, triclinic, P1̅ (No. 2), a = 8.5232(17) Å, b = 9.947(2) Å, c = 11.555(2) Å, α = 72.76(3)°, β = 77.78(3)°, γ = 70.13(3)°, V = 873.2(3) Å3, Z = 1, R gt (F) = 0.0363, wR ref (F 2 ) = 0.0852, T = 293(2) K.

Crystal structure of poly-[(μ-1,4-bis(2-ethylbenzimidazol-1-ylmethyl)benzene-κ2 N:N′)-bis(μ4-2,2′-(1,3-phenylene)diacetate-κ4 O:O′:O′′:O′′′)dizinc(II)], C44H38N4O8Zn2

C44H38N4O8Zn2, triclinic, P1̅ (No. 2), a = 9.5486(19) Å, b = 10.578(2) Å, c = 11.088(2) Å, α = 75.40(3)°, β = 102.22(3)°, γ = 114.43(3)°, V = 960.0(3) Å3, Z = 1, R gt (F) = 0.0305, wR ref (F 2 ) = 0.0645, T = 293(2)K.

Crystal structure of diaquabis(bicyclo[2.2.1]hept-5-ene-2,3-dicarboxylate-κ 4O, O′:/O′′,O′′′)bis-(2,2′-bipyridine-κ 2N, N′)dicadmium(II) hydrate

The complex: C19H18CdN2O5, Triclinic, P-1, a = 9.6654(11) Å, b = 10.5458(12) Å, c = 10.7081(12) Å, α = 108.5220(10)°, β = 92.0640(10)°, γ = 111.4760(10)°, V = 948.62(19) Å3, R gt (F) = 0.0200, wR ref (F 2 ) = 0.0535, Z = 2, T = 293(2) K.

Crystal structure of 4,4′-bipyridin-1-ium 3,3′,5′-tricarboxy-[1,1′-biphenyl]-2-carboxylate, (C26H18N2O8)

C26H18N2O8, triclinic, P1̅ (No. 2), a = 10.101(5) Å, b = 10.589(6) Å, c = 10.705(6) Å, α = 93.183(8)°, β = 108.614(8)°, γ = 97.323(8)°, V = 1070.5(10) Å3, Z = 2, R gt (F) = 0.0399, wR ref (F 2 ) = 0.1027, T = 296(2) K.

Crystal structure of 4-(3-(pyridin-3-yl)-1H-1,2,4-triazol-5-yl)benzoic acid, C14H10N4O2

C14H10O2N4, monoclinic, P21/c, a = 11.750(18) Å, b = 8.194(13) Å, c = 12.91(2) Å, β = 102.306(19)°, V = 1214(3) Å3, Z = 4, R gt (F) = 0.0505, wR ref (F 2 ) = 0.1098, T = 296(2) K.

Crystal structure of catena-poly[bis(μ 2-4-(3-(pyridin-3-yl)-1H-1,2,4-triazol-5-yl)benzoato)-κ 2 N:O)copper(II)] dihydrate, C28H22N8O6Cu

C28H22O6N8Cu, Triclinic, P1̅, a = 6.826(5) Å, b = 9.040(7) Å, c = 10.930(8) Å, α = 101.068(8)°, β = 95.054(8)°, γ = 96.278(8)°, V = 653.8(9) Å3, Z = 1, R gt (F) = 0.0469, wR ref (F 2 ) = 0.1063, T = 293(2) K.