Polymorphisms of Crystalline Solids

A polymorphic polymorph of a crystalline solid is a phenomenon in which a compound can precipitate and form many crystal structures. Because of space-time constraints, we decided to limit the scope of this article to polymorphisms containing only crystalline solids, not polymorphisms related to DNA and genetically related topics. In many technical fields it is known that the presence of polymorphisms and the characteristics of different polymorphisms are important.

Alok Tripathi et al. (2010) 77 developed 10 crystalline polymorphic forms and amorphous forms of rabeprazole sodium. Polymorphisms impart their physical properties to the biological activity of the drug, the physical and chemical properties of the drug, or the influence of the industrial manufacturing process of the material. Researchers attracted new polymorphs of rabeprazole sodium. Several polymorphism-related parameters such as solvent type, addition order, temperature, solvent volume, agitation speed, pH of the reaction mixture, etc. have a great influence on polymorphism.

Many compounds have the ability to crystallize, some of which have different crystal structures, a phenomenon known as polymorphism. Each polymorph is in fact a different thermodynamic solid state and the crystalline polymorph of the same compound shows different physical properties such as dissolution rate, shape (angle between facet and facet), melting point, etc. wait. Therefore, polymorphism is very important in the industrial production of crystalline products. In addition, the crystalline phase can sometimes be converted to one another by factors such as temperature.

The solid crystalline phase of the compound resulting from the possibility of at least two different arrangements of compound molecules in the solid state. In other words, the presence of a given substance in more than one crystal form having different physical properties is called polymorphism. Polymorphism occurs in many elements and compounds. Between elements, it is called an allotrope. For example, if the ice is being heated at a specific temperature, consider the polymorphism of the water at very high pressure before taking many new solid phases. These new solid phases are stable only at very high pressures and correspond to ice of different crystal forms with different physical properties. This phenomenon is called polymorphism. The water phase diagram of high pressure water or polycrystalline is shown below.