title: Substituent constants of azulene.
abstract: The ionization constants in water for six 3-substituted azuloic acids were determined spectrophotometrically. Conversion of these physical constants to their pKa values allowed a set of Hammett-type sigma values for the substituents on these acids to be calculated. Determination of partition coefficients for nine 1-substituted azulenes allowed Hansch-type pi values to be determined, using azulene as the model compound.
mesh_terms: D052176:Azulenes; D001565:Benzoates; D055598:Chemical Phenomena; D002621:Chemistry; D003508:Cycloheptanes / Q000032:analysis*; D003517:Cyclopentanes / Q000032:analysis; D006863:Hydrogen-Ion Concentration; D012995:Solubility
chemical_list: D052176:Azulenes; D001565:Benzoates; D003508:Cycloheptanes; D003517:Cyclopentanes; C005525:azulene