2007年7月
Solvation number and conformation of N,N-dimethylacrylamide and N,N-dimethylpropionamide in the coordination sphere of the cobalt(II) ion in solution studied by FT-IR and FT-Raman spectroscopy
ANALYTICAL SCIENCES
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- 巻
- 23
- 号
- 7
- 開始ページ
- 835
- 終了ページ
- 840
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.2116/analsci.23.835
- 出版者・発行元
- JAPAN SOC ANALYTICAL CHEMISTRY
The solvation number and conformation of N,N-dimethylacrylamide (DMAA) in the coordination sphere of the cobalt(II) ion in solution were studied, and compared with those of N,N-dimethylpropionamide (DMPA) by means of FT-Raman and Fr-IR spectroscopy. Both solvents are present as either the planar cis or nonplanar staggered conformer in equilibrium, and the former is more stable in the bulk. As these solvents solvate the metal ion through the carbonyl O atom of the acryl (DMAA) or propionyl (DMPA) group, the solvation structure around the metal ion is highly congested to reduce the solvation number and/or to lead to a conformational geometry change of solvent. It turns out that the solvation number of the cobalt(II) ion is 4 for both DMAA and DMPA at 298 K, and that DMPA changes its conformation upon solvation, whereas DMAA hardly changes. The enthalpy of conformational change Delta H degrees for DMPA is 5 kJ mol(-1) in the bulk, and is -9 kJ mol(-1) in the coordination sphere of the cobalt(II) ion.On the other hand, the Delta H degrees value for DMAA is 9 kJ mol(-1) in the bulk.
- リンク情報
- ID情報
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- DOI : 10.2116/analsci.23.835
- ISSN : 0910-6340
- Web of Science ID : WOS:000248110800014