- 作者: 蔡石津; 林渭川
- 作者服務機構: Contribution from the Department of Chemistry, National Taiwan University, Taipei
- 中文摘要:
The chemical shifts of carboxyl proton in benzoic acid have been measured in a variety of solvents. The characteristic monomer and dimmer chemical shift have been evaluated at 23°. A derailed discussion id given to illustrate the solvent shift of carboxyl proton, from which the dielectric constant of solvent is considered as the main factor.
The plot of carboxyl proton shift against (ε-1)/(ε+1) reveals a roughly linear dependence, indicating that a high field shift will be brought about by an increasing dielectric constant of solvent. Another linear relationship between log (δ-δ) and logε suggests that an increase ofε will destroy the cyclic dimmer, leading to an increase of the monomeric population and therefore to a higher field of the carboxyl proton signal. - 英文摘要: --
- 中文關鍵字: --
- 英文關鍵字: --