title: Anion-responsive supramolecular gels.
abstract: Supramolecular gels that change their state or structure in response to anion stimuli have been highlighted. Only a few examples exist of such supramolecular gels, the structures and properties of which can be controlled and modulated by interactions with anions. To form anion-responsive dimensionally-controlled organized structures, the constituent low-molecular-weight gelator molecules must act as anion receptors by possessing one or more of van der Waals interaction units (aliphatic chains), stacking pi planes, hydrogen-bonding sites, and metal-coordination units. This Concept focuses on the gelation and transition behaviors of amide- and urea-based anion-stimulated systems, metal-coordinated systems, and novel acyclic pi-conjugated oligopyrroles that act as "molecular flippers."
authors.affiliation: College of Pharmaceutical Sciences, Institute of Science and Engineering, Ritsumeikan University, Kusatsu 525-8577, Japan. maedahir@ph.ritsumei.ac.jp
authors.forename: Hiromitsu
authors.initials: H
authors.lastname: Maeda
mesh_terms: D000838:Anions / Q000737:chemistry*; D005782:Gels / Q000737:chemistry*; D006860:Hydrogen Bonding; D046911:Macromolecular Substances / Q000737:chemistry; D015394:Molecular Structure; D009942:Organometallic Compounds / Q000737:chemistry; D011758:Pyrroles / Q000737:chemistry; D013056:Spectrophotometry, Ultraviolet
chemical_list: D000838:Anions; D005782:Gels; D046911:Macromolecular Substances; D009942:Organometallic Compounds; D011758:Pyrroles