Naslov
Solid-state potassium encapsulation with 18-crown-6 ether

Autori
Vugrin, Leonarda ; Halasz, Ivan ; Geneste, Hervé

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
The Twenty-ninth Slovenian-Croatian Crystallographic Meeting Book of Abstracts : book of abstracts and programme / Pevec, Andrej ; Počkaj , Marta - Ljubljana : Fakulteta za kemijo in kemijsko tehnologijo Univerze v Ljubljani, 2023, 56-56

Skup
Twenty-ninth Slovenian-Croatian crystallographic meeting

Mjesto i datum
Topolšica, Slovenija, 14.06.2023. - 25.06.2023

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
crown ether ; complexation ; solid-state ; mechanochemical reactivity

Sažetak
Crown ethers were discovered in 1967 and since then, the interest in their properties and applications increased. Crown ethers have specific molecular shapes and planar conformation, but the flexibility of the ring can change depending on the interactions with guest ions or molecules. The cation encapsulation in the 18-crown-6 ether (18c6) cavity is well-known in solution chemistry, however, the supramolecular recognition may also be accomplished in the solid state. Our goal was to explore the complexation of 18c6 with potassium salts in a ball mill and test the reactivity of the formed [18c6K]OH complex. The successful complexation was evidenced by powder X-ray diffraction (PXRD) and IR spectroscopy. The Cambridge Structural Database served as a tool for searching the previously reported crystal structures and matching them with experimentally observed ones, while a new crystal structure of a monohydrate complex of the 18c6 and the KCl ion pair was solved and refined against laboratory PXRD data. It was found that the initial squashed conformation of 18c6 molecules in the pure solid opens with milling. The catalytic properties of [18c6K]OH complex were tested in two organic reactions, the Henry reaction and the nucleophilic aromatic substitution reaction. The results indicate the potential of using crown ether complexes in solid-state catalysis where their use is still underexplored.

Izvorni jezik
Engleski

Znanstvena područja
Kemija

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