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Dielectric Relaxation of Methyl Methacrylate and Ethyl Methacrylate on Complexation with Phenols

物理化学学报 2007年第4期23卷 513-516页

作者： LIAKATHALIKHAN Faize sivagurunathan periyasamy Department of Physics Annamalai University Annamalai Nagar Tamil Nadu-608 002 India

Dielectric absorption studies of H-bonded complexes of methyl methacrylate (MMA) and ethyl methacrylate (EMA) with p-cresol, p-chlorophenol, 2,4-dichlorophenol, and p-bromophenol were studied at microwave frequency 9.37 GHz in dilute solution of carbon tetrachloride at 308 K. Different dielectric parameters like dielectric constantε′ and dielectric loss ε″ at microwave frequency, static dielectric constant ε_0 and dielectric constant ε_∞ at optical frequency were determined. The validity of the single frequency equation of Higasi et al. for multiple relaxation time τ_(1) was found to be a function of the hydrogen bonding strength of phenolic hydrogen, whereas the group rotation relaxation time τ_(2) was a function of the steric interaction of proton donor. The relaxation time was the maximum at 50∶50 (molar ratio) of methacrylates with phenols.

关键词：化学制品丙烯酸酯电介质微波

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Hydrogen Bonding Interaction between N-methylformamide and Alcohols

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物理化学学报 2006年第12期22卷 1560-1562页

作者： RAMACHANDRAN Krishnamurthy DHARMALINGAM Kurunthu sivagurunathan periyasamy Department ofPhysics Annamalai University Annamalai Nagar608002Tamil NaduIndiaDepartment ofPhysicsAnnamalai UniversityAnnamalai Nagar608002Tamil NaduIndiaDepartment ofPhysicsAnnamalai UniversityAnnamalai Nagar608002Tamil NaduIndia

The hydrogen bonding interactions between N-methylformamide and primary,secondary,and tertiary alcohols have been studied using the FTIR spectroscopic *** most likely association complex between alcohol and N-methylformamide is the 1∶1 stoichiometric complex formed between the hydroxyl group of alcohol and the carbonyl group of *** formation constant of the 1∶1 complexes has been calculated using the Nash *** appears that the primary alcohols have larger formation constant compared with the secondary and tertiary *** results showed that the proton-donating ability of the alcohols decreased in the order:primary>secondary>tertiary,and that the association constant increased with the increase in carbon chain of the alkyl group of alcohols.

关键词：酒精氢结合物光谱学

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