Spectrophotometric Studies and Analytical Applications of Vanadium(IV) Chelates with 4-(2-Pyridylazo)resorcinol and 1-(2-Pyridylazo)-2-naphthol

Abstract

Abstract Oxovanadium(IV), VO2+, gives sensitive colour reactions with 4-(2-pyridylazo)resorcinol (ε=2.54×104 at λmax 550 nm) and 1-(2-pyridylazo)-2-naphthol (ε=1.02×104 at λmax 560 nm). The composition of the complexes VO2+: PAN or PAR was established by the continuous variations, mole ratio, and Asmus straight line methods. Lambert-Beer’s law range, Ringbom optimum range, pH stability range, photometric error, and stability constant values were also evaluated.