Temperature dependence of the νs(OH) band shape of ortho-Mannich bases in gas phase and liquid xenon solution

Результат исследований: Научные публикации в периодических изданияхстатьярецензирование

7 Цитирования (Scopus)

Аннотация

Infrared spectra of the two ortho-Mannich bases 2-(N,N-dimethylaminomethyl)-4-chlorophenol (I) and 2-(N,N-dimethylaminomethyl)-4,6-dichlorophenol (II) with a medium-strong intramolecular hydrogen bond, were measured in a wide frequency (4000-50 cm-1) and temperature (-105°C to +120°C) range in liquid Xe, CCl4 solutions and gas phase. The temperature studies of the first and second spectral moments of the νs(OH) band in liquid Xe within the temperature range from -105 to +30°C allow for the analysis of the νs(OH) mode coupled with the low-frequency vibrations (νl) of the non-linear hydrogen bond. Transitions located at ca. 150, 250 and 340 cm-1 were selected as such νl modes. The effective coupling parameter between high-frequency νs(OH) and low-frequency νl vibrations of the hydrogen bridge was evaluated: b = αssll {reversed tilde equals} 0.7. Model calculations accounting for the hot and combination transitions give satisfactory reproduction of the gas phase νs(OH) and νs(OD) bands shapes. Both temperature experiments and model calculations predict that even at 0 K the halfwidth of the νs(OH) band can be quite large, viz. ca. 200-400 cm-1.

Язык оригиналаанглийский
Страницы (с-по)265-274
Число страниц10
ЖурналVibrational Spectroscopy
Том7
Номер выпуска3
DOI
СостояниеОпубликовано - 1 янв 1994

Предметные области Scopus

  • Спектроскопия

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