9750. 2,4,6-Tripyridyl-s-triazine

Nomenclature

CAS number: 3682-35-7
2,4,6-Tri-2-pyridyl-s-triazine; 2,4,6-tripyridyl-1,3,5-triazine; tripyridyltriazine; TPTZ.
C18H12N6; mol wt 312.33.
C 69.22%, H 3.87%, N 26.91%.

Description and references

Synthesis: Case, Kroft, J. Am. Chem. Soc. 81, 905 (1959). Preparation: Schaefer, US 3294798 (1966 to Am. Cyanamid). Thermal stability data: Johns et al., J. Chem. Eng. Data 7, 227 (1962). Review: “2,4,6-Tripyridyl-s-triazine” in Diehl et al., The Iron Reagents (The G. Frederick Smith Chem. Co., Columbus, Ohio, 1965) pp 41-56.

Chemical structure

Properties

Crystals, mp 210-220° (Schaefer); trihydrate from aqueous ethanol, mp 244-245° (Case, Kroft). Reacts with ferrous ions to yield intense violet color over pH range 3.4-5.8. Absorption max Fe(TPTZ)22+ (water): 593 nm (ε 22600), Collins et al., Anal. Chem. 31, 1862 (1959).

Use

Reagent for the spectrophotometric determn of iron.