Center for Molecular Spectroscopy and Dynamics, Institute for Basic Science (IBS), Seoul 136-701, Korea.
Phys Chem Chem Phys. 2015 May 7;17(17):11770-8. doi: 10.1039/c5cp00454c.
An infrared (IR) probe based on isonitrile (NC)-derivatized alanine 1 was synthesized and the vibrational properties of its NC stretching mode were investigated using FTIR and femtosecond IR pump-probe spectroscopy. It is found that the NC stretching mode is very sensitive to the hydrogen-bonding ability of solvent molecules. Moreover, its transition dipole strength is larger than that of nitrile (CN) in nitrile-derivatized IR probe 2. The vibrational lifetime of the NC stretching mode is found to be 5.5 ± 0.2 ps in both D2O and DMF solvents, which is several times longer than that of the azido (N3) stretching mode in azido-derivatized IR probe 3. Altogether these properties suggest that the NC group can be a very promising sensing moiety of IR probes for studying the solvation structure and dynamics of biomolecules.
基于异腈（NC）衍生丙氨酸 1 合成了一种近红外（IR）探针，并使用傅里叶变换红外（FTIR）和飞秒红外泵浦探针光谱法研究了其 NC 伸缩模式的振动特性。结果发现，NC 伸缩模式对溶剂分子的氢键能力非常敏感。此外，其跃迁偶极矩强度大于腈（CN）在腈衍生的 IR 探针 2 中的强度。在 D2O 和 DMF 溶剂中，NC 伸缩模式的振动寿命被发现为 5.5 ± 0.2 ps，比叠氮（N3）衍生的 IR 探针 3 中的伸缩模式长几个数量级。所有这些性质表明，NC 基团可以作为研究生物分子溶剂化结构和动力学的 IR 探针的非常有前途的传感部分。
