Abstract

The 1650 cm-1 IR absorption band for the fundamental vibration of the C = O group in tetramethylurea (TMU) exhibits a substantial solvent-induced shift in polar and nonpolar aprotic solvents at 298 K. Earlier studies have rationalized the upsilon max (C = O) shifts in terms max of the empirical Gutmann acceptor numbers (ANs) for the solvents or the Kirkwood parameter in dielectric permittivity (epsilon). With a larger set of test data, other reaction field models are now compared which incorporate alternative continuum functions as elements in the formulation of an SCRF-MO perturbation description for the aprotic solvent effect upon the upsilon max (C = O) of TMU. The magnitude max of the band shift appears to depend on both the solvent dipolarity and solvent polarizability, with the first being the dominant factor in the more reliable model.

Enhancement of third-order nonlinear optical susceptibility of Alq₃ in polar aprotic solvents

Beata Derkowska-Zielinska
Opt. Lett. 42(3) 567-570 (2017)

Ultra-broadband microwave metamaterial absorber with tetramethylurea inclusion

Jiaqi Zhang, Xiaoyu Wu, Liyuan Liu, Cheng Huang, Xieyu Chen, Zhen Tian, Chunmei Ouyang, Jianqiang Gu, Xueqian Zhang, Mingxia He, Jiaguang Han, Xiangang Luo, and Weili Zhang
Opt. Express 27(18) 25595-25602 (2019)

Solvent Effects on Carbonyl Bands in Infrared Spectra*

Robert P. Bauman and Elinor Thomson
J. Opt. Soc. Am. 53(1) 202-203 (1963)

Molecular polarizability investigation of polar solvents: water, ethanol, and acetone at terahertz frequencies using terahertz time-domain spectroscopy

Tianyao Zhang, Zhaohui Zhang, Xiaoyan Zhao, Can Cao, Yang Yu, Xingyue Li, Ying Li, Yan Chen, and Qing Ren
Appl. Opt. 59(16) 4775-4779 (2020)

Vibrational Spectroscopy in Optics and Spectroscopy*

D. E. Freeman
J. Opt. Soc. Am. 52(1) 103_2-110 (1962)