Thermal and spectroscopic (IR, XPS) properties of lanthanide(III) benzene-1,3,5-triacetate complexes

Abstract

The metal-organic frameworks of the formula Ln(bta)ÁnH 2 O where n = 3, 4, 5 or 6; bta = benzene-1,3,5triacetate ion: [C 9 H 9 (COO) 3 ] 3-; Ln = La(III), Nd(III), Eu(III), Tb(III), Ho(III), Tm(III), Lu(III) were synthesized by the reaction of LnCl 3 ÁxH 2 O with ammonium salt of H 3 bta acid in water solution. Insoluble water compounds crystallize in the monoclinic or triclinic crystal system, and they are stable up to 30°C. When heated, they decompose up to 160-200°C in two stages to stable anhydrous compounds. The dehydrated compounds Ln(bta) are still crystalline and stable up to about 350°C. When heated above 350°C, they undergo decomposition where the intermediate products are Ln 2 O 2 CO 3 or Tb 4 O 6 CO 3 and the residues are: Ln 2 O 3 or Tb 4 O 7. The interpretation of IR spectra of title compounds was made taking into consideration the experimental and theoretical wavenumbers obtained for H 3 bta specie. The XPS spectra of H 3 bta and its complexes were recorded. The way of metal-carboxylate group of ligand coordination was discussed. This work presents the results of the XPS analyses, which allowed to determine the binding energies (E b) for the main lines of Ln3d, Ln4d, Ln5p, C1s, O1s spectra, spin-orbital splitting and full width at half maximum complexes.

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

“…Previously, we have focused on the hydrothermal synthesis and characterization of lanthanide complexes based on the 1,3-phenylenediacetate ligand [39]. As the continuation of our investigations on lanthanide carboxylates [40][41][42][43][44][45], six novel coordination polymers of selected lanthanide ions (i.e., Pr(III), Sm(III), Eu(III), Tb(III), Dy(III), and Er(III)) with flexible 1,2-phenylenediacetate linker were synthesized and characterized. The compounds were prepared by the solvothermal approach from the N,N′-dimethylformamide medium.…”

Terbium (III) coordination polymer–copper (II) compound as fluorescent probe for time‐resolved fluorescence ‘turn‐on’ detection of hydrogen sulfide

“…Two component peaks centered at 531.8 and 533.0 eV in the high‐resolution O1s scan of DPA/Tb/G and belongs to –COO − and –C = O, respectively. By comparison with pure DPA and G, the binding energy of pyridinic‐N, pyrrole‐N and amide‐N in DPA/Tb/G shifted from 398.3, 399.5 and 400.8 eV to 398.7, 400.0 and 400.7 eV . Furthermore, the binding energy of –COO − and –C = O shifted from 533.6 and 532.3 eV to 533.0 and 531.8 eV.…”

The Preparation of Porous Sol-Gel Silica with Metal Organic Framework MIL-101(Cr) by Microwave-Assisted Hydrothermal Method for Adsorption Chillers

“…Figure 1 shows the FTIR spectra of the as-prepared MIL-101(Cr)-n%)-Si samples with different MIL-101(Cr) percentages. The broad absorption band, which appears at 3500 cm −1 corresponds to the OH stretching vibration derived from the strongly H-bonded COOH groups [ 35 ]. In addition, the peaks at 1605 cm −1 and 1425 cm −1 correspond to the asymmetric deformation modes of the ammonia species (NH 4+ ) absorbed on the Lewis sites and Brønsted sites, respectively [ 36 ].…”