A. Glasgow, J. Timmermans
Sep 1, 2010
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Journal
Bulletin des Sociétés Chimiques Belges
Abstract
Monochloro-, dichloro-, and monobromoacetic acids (99.8 mole percent or better) have been prepared. The following physical properties have been determined: melting point (monobromo and dichloro acids), dielectric constants of liquid and solid (monochloro and dichloro), specific heat of solid (monobromo and dichloro), and heat of fusion (dichloro). Thermal analysis of solutions of the monobromo and dichloro acids with each other, with monochloro acid, and with water was used to obtain the phase diagrams. Three polymorphic forms of monochloroacetic acid were found at normal pressures; no polymorphs were found for the dichloro and monobromo acids. Formation of a continuous series of solid solutions between monobromoacetic acid and the metastable β-form of monochloroacetic acid suggests that this metastable form and the monobromo acid have the same crystal structure.