Refractive Indices and Isentropic Compressibilities of Glycylglycine−FeCl2 in Aqueous Ethanol Mixtures

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• 作者：M. S. Santosh ; D. Krishna Bhat
• 刊名：Journal of Chemical & Engineering Data
• 出版年：2010
• 出版时间：November 11, 2010
• 年：2010
• 卷：55
• 期：11
• 页码：5365-5369
• 全文大小：143K
• 年卷期：v.55,no.11(November 11, 2010)
• ISSN：1520-5134

文摘

The density and refractive index studies have been carried out for glycylglycine−FeCl₂ in aqueous ethanol mixtures at four different temperatures in the range T = (288.15 to 318.15) K. A comparative study of the refractive indices obtained experimentally and those calculated by means of Gladstone−Dale and Lorentz−Lorenz relation has been made. Among them, the Gladstone−Dale equation afforded similar values to those obtained experimentally. Isentropic compressibilities, κ_S, and excess molar isentropic compressibilities, K_S,m^E, were estimated using the Kirkwood model. Using the Redlich−Kister type equations, excess partial molar isentropic compressibilities, K_S,i^E, were also obtained. The observed negative values of K_S,2^E in the water-rich region are due to the structural disorderliness. As infinitely dilute water is hydrogen-bonded to ethanol and glycylglycine, the variation of strength of interaction is not sensed by K_S,1^E,∞.