Communications

Molecular fan based on photoinduced recoordination in bis(aza-18-crown-6) cyclohexanone EtNH₃⁺ complexes: mechanism and its unusual aspects

O. A. Alatortsev^a, V. V. Volchkov^a, M. N. Khimich^a, I. D. Sorokin^a, M. Ya. Melnikov^a, F. E. Gostev^b, I. V. Shelaev^b, V. A. Nadtochenko^b, M. V. Fomina^c, S. P. Gromov<sup>ac

a</sup> Department of Chemistry, M. V. Lomonosov Moscow State University, 119991 Moscow, Russian Federation
^b N. N. Semenov Federal Research Center for Chemical Physics, Russian Academy of Sciences, 119991 Moscow, Russian Federation
^c Photochemistry Center, Kurchatov Complex of Crystallography and Photonics, National Research Centre ‘Kurchatov Institute’, 119421 Moscow, Russian Federation

Abstract: Time-resolved femtosecond absorption spectroscopy data together with TD DFT calculations for CD6, a bis(aza-18 crown-6)-containing dienone derivative of cyclohexanone, as well as its complex with EtNH₃⁺ confirm that the latter undergoes photoinduced recoordination. This process takes hundreds of femtoseconds and involves N···H···N bond cleavage along with the formation of new O···H···N bonds. There is no change in the conformation of the complex upon photorecoordination.

Keywords: azacrown ether, ammonium cation, hydrogen bonds, supramolecular complex, molecular fan, photorecoordination, femtosecond spectroscopy, TD DFT calculations.

Received: 22.07.2025
Accepted: 03.09.2025

Language: English

DOI: 10.71267/mencom.7882