氮化碳分子内振动能量转移的超快二维红外光谱

Intramolecular Vibrational Energy Transfer in Carbon Nitride Examined by Ultrafast 2D Infrared Spectroscopy

利用碱处理法剥离制备了氮化碳重水胶体溶液,通过FTIR光谱表征发现其具有三个C=N伸缩振动吸收峰。根据文献构建了一系列氮化碳模型分子并对其开展振动光谱计算,对三个吸收峰进行了系统指认,结果表明三个吸收峰分别来自于三个不同区域的3-s-三嗪C=N键的伸缩振动。超快时间分辨的二维红外光谱手段观测到了发生在三个不同C=N伸缩振动模式间的能量转移。

Carbon nitride heavy water colloidal solution was prepared by an alkali exfoliating treatment.FTIR spectrum shows three C=N stretching vibrational absorption peaks.The vibrational calculations were performed on a series of carbon nitride model molecules constructed according to the literature in order to identify these three absorption peaks.Our results suggest that these three absorption peaks originate from the stretchingvibration of C= N bond in three different 3-s-triazine regions.Further,the vibrational energy transfer process amongthe three C= N stretching vibrational modes was investigated by means of ultrafast time-resolved two-dimensional infrared spectroscopy.