title: Colorimetric visualization of acid-base equilibria in non-polar solvent.
abstract: Visualization of an acid-base equilibrium in a non-polar solvent (dichloromethane), which may be extended to other solvents, is reported. It is based on an oxoporphyrinogen as a multichromic indicator of prevailing acidity in solution and presents up to six distinct hues depending on degree of protonation, tautomeric state or presence of a basic guest.
authors.affiliation: WPI-Centre for Materials Nanoarchitectonics, National Institute for Materials Science, Namiki 1-1, Tsukuba, Ibaraki 305-0044, Japan.
authors.forename: Atsuomi
authors.initials: A
authors.lastname: Shundo
authors.forename: Shinsuke
authors.initials: S
authors.lastname: Ishihara
authors.forename: Jan
authors.initials: J
authors.lastname: Labuta
authors.forename: Yosuke
authors.initials: Y
authors.lastname: Onuma
authors.forename: Hideki
authors.initials: H
authors.lastname: Sakai
authors.forename: Masahiko
authors.initials: M
authors.lastname: Abe
authors.forename: Katsuhiko
authors.initials: K
authors.lastname: Ariga
authors.forename: Jonathan P
authors.initials: JP
authors.lastname: Hill
mesh_terms: D000136:Acid-Base Equilibrium; D003124:Colorimetry; D008752:Methylene Chloride / Q000737:chemistry*; D015394:Molecular Structure; D012997:Solvents / Q000737:chemistry
chemical_list: D012997:Solvents; D008752:Methylene Chloride