Hydrogen bonding network dynamics of 1,2-propanediol-water binary solutions by Raman spectroscopy and stimulated Raman scattering

• Published in: Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy Molecular and biomolecular spectroscopy, 2023-01, Vol.284, p.121825, Article 121825
• Main Authors: Xu, Yang, Xing, Lu, Cao, Xianwen, Li, Dongfei, Men, Zhiwei, Li, Zhanlong, Wang, Shenghan, Sun, Chenglin
• Format: Article
• Language: English
• Subjects: 1,2-propanediol-water binary solutions; Hydrogen bonds; Intermolecular interaction; Stimulated Raman scattering
• ISSN: 1386-1425
• DOI: 10.1016/j.saa.2022.121825

[Display omitted] •When the volume fraction of 1,2-PD was 0.4, the hydrogen bonding network of water was the weakest.•The peaks at 3283 cm−1 and 3319 cm−1 represent “ice-like” structures.•When V1,2-PD greater than 0.4, the main hydrogen bond structure of solution completes the transition from H2O-H2O to H2O-1,2-PD. Raman spectroscopy and stimulated Raman scattering (SRS) were used to investigate the hydrogen bonding (HB) network in 1,2-propanediol (1,2-PD)-water binary solutions. Abnormal changes in hydrogen bonds (HBs) were detected when V1,2-PD (volume fraction of the1,2-PD) was 0.4. In the case of Raman spectroscopy, the HB strength of water is weakened and then strengthened with the increase of 1,2-PD volume fraction. In the case of SRS, two new peaks at 3283 cm−1 and 3319 cm−1 were appeared, which demonstrated the appearance of ice-like structures near the methyl group and the weakening of HBs. Based on these phenomena, the HB structure of this binary system underwent a transition from H2O-H2O to H2O-1,2-PD when the V1,2-PD was 0.4 as V1,2-PD increased. This work serves as a reference value for the study of HB networks in alcohol-water binary solutions.