Volume 38, Issue 6 pp. 1073-1080
Research Article

Formation of Salicylic Acid/4,4′-Dipyridyl Cocrystals Based on the Ternary Phase Diagram

Kyeong-Sill Lee

Kyeong-Sill Lee

Crystallization Process & Engineering Laboratory, Department of Chemical Engineering, Hanbat National University, Dukmyung-dong, Yuseong-Gu, Daejeon, South Korea.

Martin-Luther-Universitat Halle-Wittenberg, Zentrum für Ingenieurwissenschaften, Verfahrenstechnik/TVT, Halle, Germany.

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Kwang-Joo Kim

Corresponding Author

Kwang-Joo Kim

Crystallization Process & Engineering Laboratory, Department of Chemical Engineering, Hanbat National University, Dukmyung-dong, Yuseong-Gu, Daejeon, South Korea.

Crystallization Process & Engineering Laboratory, Department of Chemical Engineering, Hanbat National University, Dukmyung-dong, Yuseong-Gu, Daejeon, South Korea.Search for more papers by this author
Joachim Ulrich

Joachim Ulrich

Martin-Luther-Universitat Halle-Wittenberg, Zentrum für Ingenieurwissenschaften, Verfahrenstechnik/TVT, Halle, Germany.

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First published: 26 May 2015
Citations: 14

Abstract

The solubility behavior of salicylic acid (SAA)/4,4′-dipyridyl (4,4′-dipy) cocrystals is investigated in an ethanol solvent. The phase solubility diagram (PSD) of SAA/4,4′-dipy cocrystals is determined which are formed in a 2:1 stoichiometric ratio in ethanol. The objective is to improve the fundamentals of the formation mechanisms, solution behavior, and solid-state properties of SAA/4,4′-dipy cocrystals. The solubility behavior and solution chemistry of cocrystals are studied. It was found that the thermodynamic stability regions of the cocrystals and its components are defined by the phase solubility diagram. Besides the kinetic also the thermodynamic factor turned out to be important for the crystallization of cocrystals.

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