文摘
The influence of an ion on the hydrogen bond (HB) structure of water is of potential interest in various aspects. Herein, we studied the effects of HPO<sub>4sub><sup>2−sup> and SCN<sup>−sup> on the HB network of water in their aqueous solutions by using both femtosecond optical heterodyne-detected Raman-induced Kerr effect spectroscopy (fs OHD-RIKES) and Fourier transform infrared spectroscopy (FTIR) spectroscopy. We found that both the amplitude of the 180 cm<sup>−1sup> HB stretching band of water in the fs OHD-RIKES fast Fourier-transformed spectrum and the amplitude of the 3290 cm<sup>−1sup> HB-related stretching band of water in the FTIR spectrum are obviously enhanced in the high-concentrated K<sub>2sub>HPO<sub>4sub> solution, suggesting that HPO<sub>4sub><sup>2−sup> has the ability to make the HB of water in its aqueous solution. On the contrary, SCN<sup>−sup> has the ability to break the HB of water in its aqueous solution. Copyright