Journal of Zhejiang University SCIENCE
(ISSN 1009-3095, Monthly)
2002   Vol. 3   No. 5   p.559-562

Solvent effects on infrared spectra of 2-Methyl-4,5-dimethoxy-3 -oxo-2H-pyridizine: Part 2. Binary Solvent Systems

LIU Qing(刘清)(Department of Chemistry, Zhejiang University, Hangzhou 310027, China)  
SANG Wenqi-ang(桑文强)(Department of Chemistry, Zhejiang University, Hangzhou 310027, China)  
Xu Xiao-min(徐小民)(Department of Chemistry, Zhejiang University, Hangzhou 310027, China)  

Abstract:This research on the solvent effects of 2-methyl-4,5-dimethoxy-3-oxo-2H-pyridizine (MDOP) in binary solvent systems on the infrared spectra for MDOP in n-hexane/CHCl3 mixture solvents showed that there were three forms of carbonyl stretching vibration band [υ(C=O)] of MPOP as the mole fraction of CHCl3 in the binary solvents changes. In pure n-hexane solvent, the υ(C=O) of MDOP appeared at a relatively high wavenumber. With CHCl3 added, the υ(C=O) shifted to lower wavenumbers. Two new bands were observed over a certain range of mixture solvent compositions. The origin of the bands was discussed in the terms of two kinds of hydrogen bond together with their individual dependence on mixture composition. Comparisons were drawn for the solvent sensitivities of υ(C=O) for propanone.
Keywords:Infrared spectra, 2-methyl-4,5-dimethoxy-3-oxo-2H-pyridizine, Binary solvent effects, Carbonyl stretching vibration

CLC Number:O657.33  Document ID:A

Foundation Item:Project supported by the Analysis and Measurement Foundation of Zhejiang Province, China.
Author Resume:LIU Qing(刘清),E-mail: Lq2001@mail.hz.zj.cn

References:

[1]Engberts, J.B.F.N., 1992. Carbonyl stretching frequency characteristics for the strongly hydrophobic solute, N-Cyclohexyl-2-pyrrolidinone in Binary Aqueous Mixtures at 298.15K. J. Chem. Soc. Faraday Trans. 88(17):2493-2495.
[2]Engberts, J.B.F.N., 1993. Solvent sensitivity of the wavenumber characterising the carbonyl stretching vibration of N-Cyclohexyl-2-pyrrolidinone dissolved in pure liquids and in mixtures formed by hexane and deuteriotrichloromethane at 298.2K. J. Chem. Soc. Faraday Trans. 89(23):4199-4202.
[3], Liu, Q., Sang, W.Q., Huang, D.H., 2002. Solvent effects on infrared spectra of 2- Methyl -4,5-dimethoxy-3-oxo-2H-pyridizine. Part 1. Single solvent systems. Journal of Zhejiang University SCIENCE, 3(3): 288-291.
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Manuscript Received:2001 Oct. 19

Manuscript Revised:2002 June 25

Published:2002 Dec. 1