Two novel lanthanide metal–organic frameworks (Ln-MOFs), formulated as {[Ln2(L2)2(H2O)5]•3H2O}n (Nd 1 and Eu 2) has been acquired under hydrothermal conditions, in which H3L2 ligand was derived fro...

Two novel lanthanide metal–organic frameworks: selective luminescent sensing for nitrobenzene, Cu2+ and MnO4-

Four novel lanthanide complexes, [Ln(2,4-DClBA)3(terpy)(H2O)]·H2O (Ln = Eu(1), Tb(2)); [Ln(2,4-DClBA)3(5,5′-DM-2,2′-bipy)(C2H5OH)]2 (Ln = Eu(3), Tb(4); 2,4-DClBA: 2,4-dichlorobenzoate; terpy: 2,2′:6′,2′′-terpyridine; 5,5′-DM-2,2′-bipy: 5,5′-dimethyl-2,2′-bipyridine) have been synthesized via a conventional solution method at room temperature and structurally characterized by single crystal and powder X-ray diffraction. Complexes 1–2 exhibit mononuclear lanthanide architectures and each Ln3+ ion is nine-coordinated adopting a distorted monocapped square antiprismatic molecular geometry, while complexes 3–4 exhibit binuclear lanthanide architectures in which each Ln3+ ion is eight-coordinated adopting a distorted square antiprismatic molecular geometry. Mononuclear complexes 1–2 are stitched together via Cl–π and hydrogen bonding interactions to form the 1D, 2D, 3D supramolecular structures. While complexes 3–4 are packed together through Cl–Cl, π–π, and hydrogen bonding interactions to form 1D, 2D supramolecular structures. Luminescence investigation reveals that complexes 1, 3 and 2, 4 display strong red and green emission respectively, showing that terpy and 5,5′-DM-2,2′-bipy can act as sensitizing chromophores, but the former is more effective. The IR, TG-DTG, and the heat capacities of complexes 1–4 were also measured.

A series of lanthanide complexes with different N-donor ligands: synthesis, structures, thermal properties and luminescence behaviors

Five novel lanthanide complexes with 2-chloroquinoline-4-carboxylic acid and 1,10-phenanthroline: Crystal structures, molecular spectra, thermal properties and bacteriostatic activities

A series of ten new lanthanide complexes, [Ln2(PA)6(bipy)2]·4H2O·2bipy (Ln = Eu 1, Tb 2, Ce 3, Gd 4, Nd 5, Pr 6, Sm 7, Yb 8) and [Ln2(PA)6(bipy)2]·4H2O (Ln = Ce 9 and Er 10) (HPA = 3-(4-hydroxyphenyl)propanoic acid and bipy = 2,2′-bipyridine), have been synthesized and characterized by microanalysis, FTIR and single crystal X-ray diffraction. The complexes 1–8 and 10 are isostructural and contain two crystallographically equivalent Ln3+ ions having a coordination number 9 with distorted monocapped square-antiprism geometries in which the PA ligands adopt bridging, bidentate chelating, and tridentate chelating bridging modes to coordinate with the Ln3+ ions, while complex 9 possesses a tricapped trigonal prism geometry where only bridging, bidentate chelating modes are adopted by the PA ligands. All the complexes display a 2D supramolecular layered framework held by weak C–H⋯π, π⋯π and O–H⋯O intermolecular interactions. These interactions have been validated by Hirshfeld surface analysis. Additionally, emission studies indicated that amongst all the complexes, 1 and 2 can act as luminescent sensors for the detection of nitrobenzene and Cu2+ ions. The limits of detection (LODs) using both 1 and 2 for nitrobenzene are 3.66 and 3.71 ppm, respectively and for Cu2+ ions, they are 2.11 and 2.99 ppm, respectively.

Syntheses and crystal structures of new dinuclear lanthanide complexes based on 3-(4-hydroxyphenyl)propanoic acid: Hirshfeld surface analyses and photoluminescence sensing

Preparation, spectral properties and thermal decomposition of new ternary complexes of La(III), Ce(III), Pr(III) and Nd(III) ions with N-phenylanthranilic acid and 1,10-phenanthroline

Four dinuclear trivalent lanthanide complexes of the general formula [Ln2(2-Br-5-MOBA)6(phen)2] (Ln = Nd(), Sm(), Ho(), Er(); 2-Br-5-MOBA = 2-bromine-5-methoxybenzoate, phen = 1,10-phenanthroline) were prepared and structurally characterized. The complexes to are isostructural with a coordination number of nine. The carboxylic acid ligands adopt bridging, bidentate chelating, and tridentate chelating bridging modes to coordinate with Ln(iii) ions. The structures of the complexes were confirmed on the basis of elemental analysis, molar conductance, thermogravimetric analysis (TGA), and IR and UV spectra. The heat capacities and thermal circulating processes of the prepared complexes were performed on a differential scanning calorimeter under a nitrogen atmosphere. Two remarkable solid-solid phase transitions existed both in the heat capacities and thermal circulating processes. The bacteriostatic activities of the complexes were evaluated against Candida albicans, Escherichia coli and Staphylococcus aureus. Besides, the luminescent property of complex was also investigated, and the magnetic properties of complexes and were also discussed in detail.

Preparation, characterization and properties of four new trivalent lanthanide complexes constructed using 2-bromine-5-methoxybenzoic acid and 1,10-phenanthroline.

Four new lanthanide 4-ethylbenzoic acid complexes [Ln(4-EBA)3(terpy)H2O]2 {Ln = Sm(1), Eu(2), Tb(3), Dy(4), 4-EBA = 4-ethylbenzoate, terpy = 2,2′:6′,2′′-terpyridine} have been synthesized. The complexes are characterized by means of elemental analysis, IR, UV, and XRD. The crystals [Ln(4-EBA)3(terpy)H2O]2 {Ln = Eu(2), Tb(3)} are characterized by single-crystal X-ray diffraction. These complexes feature a tridentate terpyridine ligand, 4-ethylbenzoic acid ligands exhibiting multiple binding modes, bidentate, bridging bidentata, and monodentate, and a bound water molecule. The Ln3+ ions have a typical coordination number of nine with a distorted monocapped square antiprism. The thermal decomposition mechanism of the complexes has been investigated by TG/DSC–FTIR technology, and IR spectra of the evolved gases show complexes broken down into H2O, CO2, and other gaseous molecules as well as the gaseous organic fragments. Moreover, the complexes [Ln(4-EBA)3(terpy)H2O]2 exhibit characteristic luminescence, indicating that ligands can act as sensitizing chromophore in these systems.

Syntheses, characterization, luminescence, and thermal decomposition mechanism of four lanthanide complexes with 4-ethylbenzoic acid and terpyridine

A highly photosensitive covalent organic framework with pyrene skeleton as metal-free catalyst for arylboronic acid hydroxylation

Covalent organic frameworks (COFs) are kind of promising crystalline materials for photocatalytic organic conversion. The introduction of electron donor-acceptor (D-A) units into its structure can reasonably adjust the photoelectric properties...

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Photocatalytic conversion of arylboronic acids to phenols by a new 2D donor–acceptor Covalent Organic Framework

Model compounds were used to provide some chemical boundaries for the eight-fraction SAR-ADTM characterization method for heavy oils. It was found that the Saturates fraction consists of linear and highly cyclic alkanes; the Aro-1 fraction consists of molecules with a single aromatic ring; the Aro-2 fraction consists of mostly 2 and 3-ring fused aromatic molecules, the pericondensed 4-ring molecule pyrene, and molecules with 3–5 rings that are not fused; and the Aro-3 fraction consists of 4-membered linear and catacondensed aromatics, larger pericondensed aromatics, and large polycyclic aromatic hydrocarbons. The Resins fraction consists of mostly fused aromatic ring systems containing polar functional groups and metallated polar vanadium oxide porphyrin compounds, and the Asphaltene fraction consists of both island- and archipelago-type structures with a broad range of molecular weight variation, aromaticity, and heteroatom contents. The behavior of the eight SAR-ADTM fractions during hydrocracking and pyrolysis was investigated, and quantitative relations were established. Intercriteria analysis and evaluation of SAR-ADTM data of hydrocracked vacuum residue and sediment formation rate in commercial ebullated bed vacuum residue hydrocracking were performed. It showed that total asphaltene content, toluene-soluble asphaltenes, and colloidal instability index contribute to sediment formation, while Resins and Cyclohexane-soluble asphaltenes had no statistically meaningful relation to sediment formation for the studied range of operation conditions.

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SAR-AD Method to Characterize Eight SARA Fractions in Various Vacuum Residues and Follow Their Transformations Occurring during Hydrocracking and Pyrolysis

Jian-Xia Huo

Papers

Preparation, characterization and properties of four new trivalent lanthanide complexes constructed using 2-bromine-5-methoxybenzoic acid and 1,10-phenanthroline.

Syntheses, characterization, luminescence, and thermal decomposition mechanism of four lanthanide complexes with 4-ethylbenzoic acid and terpyridine

A highly photosensitive covalent organic framework with pyrene skeleton as metal-free catalyst for arylboronic acid hydroxylation

Photocatalytic conversion of arylboronic acids to phenols by a new 2D donor–acceptor Covalent Organic Framework

SAR-AD Method to Characterize Eight SARA Fractions in Various Vacuum Residues and Follow Their Transformations Occurring during Hydrocracking and Pyrolysis