Influence of Molecular Weight of Polyethylene Glycol on Interaction between Polyethylene Glycol and Iodine

概要

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Interaction of iodine with ethylene glycol, diethylene glycol, triethylene glycol and polyethyleneglycols (PEGs) of molecular weight between 2×10^2 and 1.1×10^4 in ethanol and in carbon tetrachloride was investigated. Absorbance of an ethanol solution of iodine at 360nm increased by the addition of PEGs. A new peak was observed at 380 nm by the addition of PEGs of molecular weight above 3×10^2 to the carbon tetrachloride solution of iodine. These findings were considered to be due to formation of iodine in the diatomic state whose interatomic distance was a little prolonged by the interaction between iodine and PEGs. Formation of iodine in the diatomic state whose interatomic distance was a little prolonged was remarkable when the molecular weight of PEG was high and the concentration of PEG was large. It was considered that the interaction force was a very weak "short-range force." From the results of the measurement of solubility of PEGs in carbon tetrachloride, optical rotatory dispersion spectra and viscosities of the solutions of PEGs, it was suggested that a PEG molecule was in spherical conformation in ethanol and that formation of iodine in the diatomic state whose interatomic distance was a little prolonged might be remarkable in the presence of PEG molecules in spherical conformation.
公益社団法人日本薬学会の論文
1974-11-25