The Method of Optoacoustic Spectroscopy in the Study of Supramolecular Systems Based on Cucurbiturils

This study is devoted to an optoacoustic study of the features of laser radiation absorption in an aqueous solution of the styryl-dye inclusion complex in cucurbituril. The research was performed on an experimental setup where a femtosecond regenerative amplifier based on chromium forsterite (Cr:F) was used as a pumping laser. The third harmonic of radiation with a wavelength of 420 nm and a pulse duration of 130 fs was used. Optoacoustic generation was produced in a quartz cuvette with the investigated solution, and the receiver of acoustic signals was a flat piezoceramic plate with a resonant frequency of 1 MHz. Optoacoustic signals were compared in a solution of pure Kr.1 styryl dye and the same dye in the presence of complexes with cucurbituril. With the same optical density of solutions, complexation leads to a more than twofold decrease in the optoacoustic response.