Azide Anion Interactions with Imidazole and 1-Methylimidazole in Dimethyl Sulfoxide.

ABSTRACT: We chose imidazole (HIm) and 1-methylimidazole (1-MeIm) to probe their interaction with the azide anion. In dimethyl sulfoxide (DMSO), the formation of hydrogen-bonded pairs between the azide ion and HIm is clearly distinguishable from free azide ions in FT-IR spectra, allowing for accurate spectra differentiation. HIm can both donate and accept hydrogen bonds, forming hydrogen-bonded networks, while 1-MeIm can accept only hydrogen bonds, preventing hydrogen-bonded network formation. To differentiate the roles of hydrogen and nonhydrogen bonding interactions with azide at ultrafast time scales, we use femtosecond mid-IR pump-probe spectroscopy. From the time-resolved data analysis, we observe a clear difference in vibrational population relaxation times of the azide anion under the presenc

SUBMITTER: Rana D 

PROVIDER: S-EPMC12359107 | biostudies-literature | 2025 Aug

REPOSITORIES: biostudies-literature