For study of 2,6-lutidine hydrogen bonding with iso-butyl and tert-butyl alcohols |
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| Affiliation: | 1. Department of Physics, College of Science, Qassim University, Buridah, 51452, Saudi Arabia;2. Physics Department, Faculty of Science, Taibah University, Al-Madinah Al-Munawarah, Saudi Arabia;1. Dr. Panjwani Center for Molecular Medicine and Drug Research, International Center for Chemical and Biological Sciences, University of Karachi, Karachi, 75270, Pakistan;2. Department of Pharmacognosy, College of Pharmacy, King Saud University, P.O. Box. 2457, Riyadh, 11451, Saudi Arabia;3. Department of Mathematics, Aston University, Birmingham, B4 7ET, United Kingdom;4. Department of Physical Chemistry, V.N.Karazin Kharkiv National University, Kharkiv, 61022, Ukraine |
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| Abstract: | The downfield shift and broadening of the isobutanol OH group signal with increasing 2,6-lutidine concentration was observed and explained by N…HO interaction. In the case of tertbutyl alcohol on increasing the 2,6-lutidine concentration the signal of the OH group shifted upfield without broadening (an effect of breaking of alcohol-alcohol hydrogen bonds). In three component systems, with a nonpolar solvent, where alcohol-alcohol interactions were eliminated (xa = 0.002) and with excess 2,6-lutidine both alcohols interacted with 2,6-lutidine and so, from the dependence of the OH group signal of isobutyl and tertbutyl alcohols on concentration and temperature the thermodynamic parameters were obtained: ΔH (4.6 and 3.4 kcal mole−1), ΔS (14.0 and 12.4 e.u.) respectively. |
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