title: Derivatives of carbohydrazide, thiocarbohydrazide and diaminoguanidine as photometric analytical reagents-I 1,3-bis[(2-pyridyl)methyleneamino]thiourea and 1,3-bis[(2-pyridyl)methyleneamino]guanidine.
abstract: 1,3-Bis[(2-pyridyl)methyleneamino]thiourea (PMAT) and 1,3-bis[(2-pyridyl)methyleneamino]-guanidine (PMAG) have been prepared. They have been examined and characterized by infrared and ultraviolet spectroscopy. A spectrophotometric method has been used for determination of the protonation constants of the reagents. Finally, a spectrophotometric survey has been made of the reactions of various cations with PMAT and PMAG.
authors.affiliation: Department of Analytical Chemistry, Faculty of Chemistry, University of Seville, Seville, Spain.
authors.forename: F J
authors.initials: FJ
authors.lastname: de La Rosa
authors.forename: J L
authors.initials: JL
authors.lastname: Ariza
authors.forename: F
authors.initials: F
authors.lastname: Pino