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The phase diagrams of the systems of trimethylbromosilane and the isomeric lutidines are shown. The existence of the congruently melting addition compounds (CH3)3SiBr ∙ (3,4-lutidine), (CH3)3SiBr (3,5-lutidine) and the incongruently melting addition compounds (CH3)3SiBr • (2,3-lutidine)2, (CH3)3SiBr • (2,3-lutidine), (CH3)3SiBr (2,4-lutidine), ((CH3)3SiBr)2 • (2,4-lutidine), (CH3)3SiBr • (2,5-lutidine)2, (CH3)3SiBr • (2,5-lutidine), (CH3)3SiBr (2,6-lutidine)2 could be proved.
A thermodynamic interpretation of the liquidus curves of some methyltrichloro-respectively dimethyldichlorosilane/lutidine-systems is given. Based on certain approximations it was possible to fit thermodynamic functions to the experimental results to obtain the excess datas of binary systems. A comparison between the models of Redlich-Kister, Wilson and the NRTL-formalism for the free excess enthalpy of binary mixtures is given.