title: Derivatives of 2-thiohydantoin as spectrophotometric analytical reagents.
abstract: The synthesis, characteristics, properties and reaction with metallic ions of four pyridine derivatives of 2-thiohydantoin have been studied. 5-(2-Pyridyl)methylene-2-thiohydantoin, 5-(6-methyl-2-pyridyl) methylene-2-thiohydantoin, 5-(di-2-pyridyl)methylene-2-thiohydantoin and 5-[1-(2-pyridyl)-1-methyl] methylene-2-thiohydantoin have been synthesized. The substances exhibit three pK values in aqueous solution and with Ag(I), Au(III), Cu(II), Pd(II) and Zn(II) form complexes with high molar absorptivities.
authors.affiliation: Department of Analytical Chemistry, Faculty of Sciences and Pharmacy, University of Sevilla, Sevilla, Spain.
authors.forename: M T
authors.initials: MT
authors.lastname: González
authors.forename: J L
authors.initials: JL
authors.lastname: Ariza
authors.forename: F
authors.initials: F
authors.lastname: Pino
authors.forename: R G
authors.initials: RG
authors.lastname: Villanova