New approach to IR study of monomer–dimer self-association: 2,2-dimethyl-3-ethyl-3-pentanol in tetrachloroethylene as an example
| Autor: | Jenn-Shing Chen, Dah-Yu Kao, Cheng-Chang Wu |
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| Rok vydání: | 2004 |
| Předmět: |
Steric effects
Tetrachloroethylene Spectrophotometry Infrared Infrared Dimer Infrared spectroscopy Photochemistry Chemistry Techniques Analytical Analytical Chemistry chemistry.chemical_compound Pentanols Spectrophotometry medicine Instrumentation Spectroscopy medicine.diagnostic_test Temperature Molar absorptivity Atomic and Molecular Physics and Optics Standard enthalpy of formation Monomer chemistry Data Interpretation Statistical Solvents Thermodynamics Physical chemistry Dimerization |
| Zdroj: | Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy. 60:2287-2293 |
| ISSN: | 1386-1425 |
| DOI: | 10.1016/j.saa.2003.12.002 |
| Popis: | The dimerization of 2,2-dimethyl-3-ethyl-3-pentanol in tetrachloroethylene in the diluted region has been studied at four temperatures by IR spectroscopy. The aforementioned solute compound is chosen because self-association beyond dimerization is hampered by the steric hindrance generated by the bulky sidechains. The integrated absorbances of the monomer bands were treated based on Eq. (9) to obtain its molar absorptivity and dimerization constant. The same dimerization constant as well as the molar absorptivity of dimer band can be obtained based on Eq. (13) from the data treatment of the integrated absorbances of the dimer band. The disparity between two values of dimerization constant determined by two independent sources offers an opportunity to check the consistency of the determination. The standard enthalpy and entropy of dimerization have also been calculated by means of van't Hoff plot, respectively, from the data of temperature-dependent dimerization constants obtained from the monomer bands and dimer bands. |
| Databáze: | OpenAIRE |
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