Polymorphism in Crystals
Deadline for manuscript submissions: closed (20 February 2023) | Viewed by 23326
A printed edition of this Special Issue is available here.
Interests: polymorph; pesticide; crystal engineering
Interests: polymorph; crystal engineering; functional crystal material
Special Issues, Collections and Topics in MDPI journals
Polymorphism, the property of a compound to crystallize in more than one distinct crystal form, plays an indispensable role in researching and developing pharmaceuticals, agrochemicals, materials, and food. Polymorphs exhibit different properties, such as crystal habit, solubility, dissolution rate, melting point, stability, mechanical properties, even bioavailability, which may influence product quality. Therefore, the study on polymorphs’ behavior can provide a theoretical basis for selecting optimal solid forms and serve for the polymorphic control and optimization of products as a primary method. Recently, significant progress has been made in the experimental discovery and theoretical prediction of crystal polymorphs. A large quantity of molecules have been discovered to have polymorphs that are mainly attributed to the molecule’s conformational flexibility and the existence of various functionalities in the molecule that could act as hydrogen bond donor/acceptor. In addition to conventional solution crystallization, more polymorphisms have been found in the melt, in confinement, and in the presence of ultrasound/lasers.
Moreover, computational predictions usually yield far more possible polymorphs than are known. The ultimate limitations of experimental reachable polymorphs and thermodynamical and structure–activity relationships of the polymorphs remain an open question. The present Special Issue on “Polymorphism in Crystals” invites status reports summarizing the progress achieved in recent years.
Dr. Jingxiang Yang
Prof. Dr. Xin Huang
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