The characteristic stretching band of the C(sp2)=C(sp)+ moiety in vinyl cations was observed for the first time around 1870 cm−1 by a time-resolved IR spectrometry with 266 nm or 308 nm laser flash irradiation of (4-methoxyphenyl)alkynes in TFE and α-arylvinyl bromide in acetonitrile. The ultraviolet-visible and the IR absorption maxima were affected by the β-substituents.
用 266 nm 或 308 nm 激光闪烁照射
TFE 中的 (4-methoxyphenyl)alkynes 和
乙腈中的α-芳基
溴乙烯基,通过时间分辨红外光谱法首次观察到
乙烯基阳离子中 C(sp2)=C(sp)+ 分子的特征伸展带在 1870 cm-1 附近。紫外-可见光和红外吸收最大值受 β-取代基的影响。