Spectral studies of niflumic acid aggregation in dissolved, solid and adsorbed states

Denis A Baranov; Sofia O Vysotskaya; Elena P Zarochentseva; Dmitry A Lisachenko; Daria A Nosova; Alexey A Tsyganenko

doi:10.1016/j.saa.2019.117224

Spectral studies of niflumic acid aggregation in dissolved, solid and adsorbed states

Spectrochim Acta A Mol Biomol Spectrosc. 2019 Nov 5:222:117224. doi: 10.1016/j.saa.2019.117224. Epub 2019 May 30.

Authors

Denis A Baranov¹, Sofia O Vysotskaya¹, Elena P Zarochentseva¹, Dmitry A Lisachenko¹, Daria A Nosova¹, Alexey A Tsyganenko²

Affiliations

¹ Saint-Petersburg State University, 199034 Saint Petersburg, Russia.
² Saint-Petersburg State University, 199034 Saint Petersburg, Russia. Electronic address: atsyg@yandex.ru.

PMID: 31176155
DOI: 10.1016/j.saa.2019.117224

Abstract

FTIR spectra of niflumic acid in solid state, dissolved in CCl₄ and adsorbed on silica or alumina surface, as well as their temperature dependence, provide information about different stages of aggregation: monomers, dimers, amorphous and crystalline solid phase, as well as about perturbation of the molecule by the surface. The spectra observed are compared with those obtained by quantum mechanical calculations. The luminescence spectra are less sensitive to the aggregation, they differ mostly in the intensity, while the position of maximum at about 440 nm remains almost the same.

Keywords: Aggregation; FTIR spectroscopy; Luminescence; Niflumic acid; Variable temperature.