Derivatives of 2-thiohydantoin as spectrophotometric analytical reagents.
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.
González
M T
MT
Department of Analytical Chemistry, Faculty of Sciences and Pharmacy, University of Sevilla, Sevilla, Spain.
Ariza
J L
JL
Pino
F
F
Villanova
R G
RG