Brightly Luminescent (TbxLu1-x)2bdc3·nH2O MOFs: Effect of Synthesis Conditions on Structure and Luminescent Properties

Luminescent, heterometallic terbium(III)-lutetium(III) terephthalate metal-organic frameworks (MOFs) were synthesized via direct reaction between aqueous solutions of disodium terephthalate and nitrates of corresponding lanthanides by using two methods: synthesis from diluted and concentrated solutions. For (Tb_xLu_1-x)₂bdc₃·nH₂O MOFs (bdc = 1,4-benzenedicarboxylate) containing more than 30 at. % of Tb³⁺, only one crystalline phase was formed: Ln₂bdc₃·4H₂O. At lower Tb³⁺ concentrations, MOFs crystallized as the mixture of Ln₂bdc₃·4H₂O and Ln₂bdc₃·10H₂O (diluted solutions) or Ln₂bdc₃ (concentrated solutions). All synthesized samples that contained Tb³⁺ ions demonstrated bright green luminescence upon excitation into the ¹ππ* excited state of terephthalate ions. The photoluminescence quantum yields (PLQY) of the compounds corresponding to the Ln₂bdc₃ crystalline phase were significantly larger than for Ln₂bdc₃·4H₂O and Ln₂bdc₃·10H₂O phases due to absence of quenching from water molecules possessing high-energy O-H vibrational modes. One of the synthesized materials, namely, (Tb_0.1Lu_0.9)₂bdc₃·1.4H₂O, had one of the highest PLQY among Tb-based MOFs, 95%.

Crystal structure of poly[bis(adipate-κ4 O,O′:O′′, O′′′)(1,4-bis(2-methyl-1H-benzo[d]imidazol-1-yl)benzene-κ2 N:N′)dizinc(II), C36H38N4O8Zn2

C36H38N4O8Zn2, monoclinic, P21/n (no. 14), a = 13.144(3) Å, b = 9.0091(18) Å, c = 15.468(3) Å, β = 112.56(3)°, V = 1691.6(6) Å3, Z = 4, R gt (F) = 0.0468, wR ref (F 2 ) = 0.0980, T = 293(2) K.

Zn(ii) and Cd(ii) coordination networks based on N-donor ligands: synthesis, crystal structures, and sensing of nitroaromatic explosives

Four new Zn(ii)/Cd(ii) complexes with 1D, 2D, and 3D structures have been synthesized and they exhibit high sensitivity sensing responses to nitroaromatic explosives.

Solvent-induced construction of two zinc metal–organic frameworks for highly selective detection of nitroaromatic explosives

Two three-dimensional metal–organic frameworks 1 and 2 based on p-terphenyl-3,4′′,5-tricarboxylic acid (H₃TPT) were synthesized by controlling the solvent media. These two MOFs exhibit high efficiency for the recyclable detection of nitroaromatic compounds.

Influence of N-heteroaromatic π–π stacking on supramolecular assembly and coordination geometry; effect of a single-atom change in the ligand

A study on how the polarization of aromatic systems, through the introduction of a nitrogen heteroatom, affects the π–π interactions and crystal packing of mercury coordination compounds.

Charge-transfer metal–organic frameworks based on CuCN architecture units: crystal structures, luminescence properties and theoretical investigations

Four cuprous cyanide charge-transfer metal–organic frameworks have been fabricated via the synchronous redox and self-assembly reaction, and exhibit intense green luminescence properties and high thermal stabilities.

Effect of robust π–π stacking synthon on the formation of mercury coordination compounds; an unusual pseudo-square planar geometry

In this study, three Hg(ii) complexes, [HgCl₂(L2-naph)]_n, 1, [HgBr₂(L2-naph)]_n, 2 and [HgI₂(L2-naph)₂], 3 where L2-naph is N-(naphthalene-2-yl)pyrazine-2-carboxamide ligand have been synthesized and characterized.

Six new coordination polymers based on a tritopic pyridyldicarboxylate ligand: structural, magnetic and sorption properties

Using a rigid ligand, pyridine-3,5-bis(phenyl-4-carboxylic) acid, six new coordination polymers have been synthesized and characterized, and their magnetic, photoluminescence and gas adsorption properties have been studied.

Syntheses, structures and properties of three new two-dimensional Cu(I)-Ln(III) heterometallic coordination polymers based on 2,2'-dipyridyl-5,5'-dicarboxylate ligands

Three new two-dimensional Cu(I)-Ln(III) heterometallic coordination polymers [Ln(III)Cu2(I)(Hbpdc)4] · Cl · xH2O [Ln(III) = La(III), x = 8 (1); Ln(III) = Pr(III), x=9 (2); Ln(III) = Eu(III), x = 8 (3)] (H2bpdc = 2,2'-bipyridyl-5,5'-dicarboxylic acid) have been prepared under hydrothermal conditions and structurally characterized by elemental analyses, inductively coupled plasma atomic emission spectrometry (ICP-AES) analyses, IR spectra, X-ray photoelectron spectroscopy (XPS) and single-crystal X-ray diffraction. X-ray diffraction indicates that the isomorphic 1-3 display the two-dimensional sheet structure constructed from [Cu(I)(Hbpdc)2](-) fragments through Ln(3+) connectors. Moreover, the solid-state photoluminescence measurements of 3 indicate that the Eu(III) ions, Hbpdc(-) ligands and Cu(I) cations make contributions to its luminescent properties simultaneously.