IR and NMR studies of hydrogen bonding in hexan-1-ol–tetrabutylammonium iodide solutions in the temperature range 28–145 °C and in tetrachloromethane

Abstract

IR spectra of (Bu₄NI)–hexan-1-ol solutions at 25, 55, 85, 115 and 145 °C in the OH stretching region have been investigated. The OH stretching spectra and the ¹H NMR chemical shifts of the hexanol OH-group were obtained from Bu₄NI–hexanol–CCl₄ solutions in the alcohol concentration range 3 × 10^–3–7.8 mol dm ^–3. The relationship between absorbance and wavenumber is represented as the product of a Lorentzian and a Gaussian curve. Using this dependence deconvolution of the OH-band was carried out by the Simplex method. From these data, it was established that Bu₄NI is a structure-breaker at moderate temperatures and/or low concentrations of CCl₄. At higher temperatures or in very dilute solutions of Bu₄NI–hexanol in CCl₄, Bu₄NI is observed to be a structure-maker.