Abstract
In 6 M hydrochloric acid solution, salicylic acid reacts with pentachloronitrosyliridate [Ir(NO)Cl 5] − to form a new 1:1 complex giving two absorption maxima at 369 and 446 nm with molar absorptivities both of 1.1 × 10 4 l.mole −1 cm −. The reaction is second order with apparent energy, E a, of 16.8 kJ/mole. At constant temperature, the apparent rate constant k increases to a maximum when the concentration of hydrogen ion is decreased to 4–5 M and the concentration of chloride ion is kept at ∼6 M. The mechanism of the reaction is also discussed. In alkaline solution, the absorption maxima shift to 381 and 506 nm with molar absorptivities of 6.0 × 10 3 and 2.4 × 10 4 l.mole −1 cm −1, respectively. Salicylic acid can be determined spectrophotometrically with high sensitivity and precision. Benzoic and boric acids do not interfere.
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