Synthesis and Characterization of a New Cu(II) Paddle-Wheel-like Complex with 4-Vinylbenzoate as an Inorganic Node for Metal–Organic Framework Material Design
Autor: | Egla Yareth Bivián-Castro, Marcos Flores-Alamo, Roberto Escudero, Virginia Gómez-Vidal, José J. N. Segoviano-Garfias, Jesus Castañeda-Contreras, Quetzalcoatl Enrique Saavedra-Arroyo |
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Jazyk: | angličtina |
Rok vydání: | 2023 |
Předmět: |
copper
paddle-wheel-like 4-vinylbenzoic acid open coordination sites metal–organic frameworks Technology Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85 |
Zdroj: | Materials, Vol 16, Iss 13, p 4866 (2023) |
Druh dokumentu: | article |
ISSN: | 1996-1944 |
DOI: | 10.3390/ma16134866 |
Popis: | A new Cu(II) paddle-wheel-like complex with 4-vinylbenzoate was synthesized using acetonitrile as the solvent. The complex was characterized by X-ray crystal diffraction, FT-IR, diffuse reflectance spectroscopy, thermogravimetric, differential scanning calorimetric, magnetic susceptibility, and electronic paramagnetic resonance analyses. The X-ray crystal diffraction analysis indicated that each copper ion was bound at an equatorial position to four oxygen atoms from the carboxylate groups of the 4-vinylbenzoate ligand in a square-based pyramidal geometry. The distance between the copper ions was 2.640(9) Å. The acetonitrile molecules were coordinated at the axial position to the copper ions. Exposure of the Cu(II) complex to humid air promoted the gradual replacement of the coordinated acetonitrile by water molecules, but the complex structure integrity remained. The EPR spectra exhibited signals attributed to the presence of a mixture of the monomeric (S = ½) and dimeric (S = 1) copper species in a possible 3:1 ratio. The magnetic studies revealed a peak at 50–100 K, which could be associated with the oxygen absorption capacity of the Cu(II)–vba complex. |
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