Chapter

Molecular Networks

Volume 132 of the series Structure and Bonding pp 87-95

Date:

Crystal Polymorphism and Multiple Crystal Forms

  • Dario BragaAffiliated withDipartimento di chimica G. Ciamician, Università degli Studi di Bologna Email author 
  • , Fabrizia GrepioniAffiliated withDipartimento di chimica G. Ciamician, Università degli Studi di Bologna
  • , Lucia MainiAffiliated withDipartimento di chimica G. Ciamician, Università degli Studi di Bologna
  • , Marco PolitoAffiliated withDipartimento di chimica G. Ciamician, Università degli Studi di Bologna

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Abstract

This chapter discusses the phenomenon of polymorphism in organic and organometallic compounds. Polymorphism is first introduced and then, to give the work some context, background information is given concerning properties and techniques for characterizing the solid phases. In particular, desolvation and interconverstion are examined, and the gas–solid reactions are presented as a successful route to obtaining new crystalline phases. Co-crystal definition is then described and the problem in distinguishing co-crystals and salts is evaluated.

Keywords

Co-crystal Hydrogen bond Organic salt Polymorphism Solid-gas reaction Solid-state NMR Solvate X-ray diffraction