Organic alloys: A supramolecular approach to the synthesis of multi-component solid solutions

ORGN 326

Venkat R. Thalladi, thalladi@wpi.edu, Marta Dabros, mdabros@wpi.edu, Paul R. Emery, and David L. Cozzens. Department of Chemistry and Biochemistry, Worcester Polytechnic Institute, 100 Institute Road, Worcester, MA 01609
Multi-component solid solutions are proposed as new types of materials that can exhibit functions superior or unavailable to the individual components. Creating solid solutions of organic molecules, however, is difficult because of the anisotropic nature of the intermolecular interactions exhibited by these molecules. Extensive studies into molecule based solid solutions led only to two-component systems; herein a supramolecular approach is presented to create alloys that incorporate two, three, and four different organic components with predetermined solid state structure. Three different types of supramolecular synthons, carboxy-carboxy, hydroxy-pyridyl, and hydroxy-amino, are shown to form the solid solutions. Bimolecular and trimolecular assemblies are used as templates for the creation of these organic alloys and the components in these alloys range from halogenated and methylated benzoic acids, phenols, anilines, and nonaromatic cyclic diazines. The principal advantages of this approach are that the relative ratio, and thus the properties, of the components can be changed at the will of the experimenter and that each new component adds a new function to the alloy.