Solvent effects on infrared spectra of methyl 4-hydroxybenzoate in pure organic solvents and in ethanol/CCl4 binary solvents.
Infrared spectroscopy studies of methyl 4-hydroxybenzoate (MHB) in 17 different organic solvents and in ethanol/CCl4 binary solvent were undertaken to investigate the solvent-solute interactions. The frequencies of carbonyl stretching vibration nu(C=O) of MHB in single solvents were correlated with the solvent acceptor number (AN) and the linear solvation energy relationships (LSER). The assignments of the two bands of nu(C=O) of MHB in alcohols and the single one of that in non-alcoholic solvents were discussed. The shifts of nu(C=O) of MHB in ethanol/CCl4 binary solvents showed that several kinds of solute-solvent hydrogen bonding interactions coexisted in the mixture solvents, with a change in the mole fraction of ethanol in the binary solvents.
Liu
Qing
Q
Department of Chemistry, Zhejiang University, Hangzhou 310027, PR China. liuqing@zju.edu.cn
Fang
Danjun
D
Zheng
Jianping
J
D000438:Alcohols / Q000737:chemistry; D002251:Carbon Tetrachloride; D000431:Ethanol; D006860:Hydrogen Bonding; D010226:Parabens / Q000737:chemistry*; D012997:Solvents; D017550:Spectroscopy, Fourier Transform Infrared
D000438:Alcohols; D010226:Parabens; D012997:Solvents; D000431:Ethanol; C015358:methylparaben; D002251:Carbon Tetrachloride