Crystallisation-Driven Self-Sorting of H-Bonded Guanidinium or Sodium Sulfonate Constitutional Molecular Frameworks

Abstract

Four single crystal structures were obtained in order to better understand the difference between the crystallisation-driven formation of solid state organo-sulfonate guanidinium superstructures and their sodium salt analogues. 5-Formyl-2-furfuryl sulfonate and 4,4′-diamino-2,2′-biphenyl disulfonate were chosen as anions due to functional and geometrical considerations together with guanidinium, aminoguanidinium, and sodium cations. 5-Formyl-2-fufuryl sulfonate reacts with aminoguanidinium cation in water leading to an imino-zwitterionic compound, able to form on its own a guanidinium-sulfonate superstructure in crystalline state.