Substituent Effects on the Blue-Shifting Hydrogen Bonds between X-C≡C-CF2-H and Water

• 来源期刊: 中国化学（英文版）
• 年，卷（期）: 2002,（3）
• 页码范围: 247-251
• 页数: 5页
• 语种: 英文

摘要

MP2/6-31 + g(d) calculations were performed verifying the existences of blue-shifting X-C≡C-CF2-H…OH2 hydrogen bonds. Detailed analyses revealed that the interaction energy and donor-acceptor distance had good correlations with the substituent Hammett constants. However, the extent of C-H bond contraction and the blue shift of the C-H stretching vibration did not show any good correlation with the traditional substituent constants, indicating that certain more complicated mechanisms might be involved in the present systems. Nevertheless, it was found that highly elcetron-withdrawing susbtituents were not favorable to the C-H bond contraction, and it was suggested that the attractive interaction between water and the carbon of - CF2H probably played an important role in the blue shift.