Iridium(IV) gives a deep red complex with 3‐nitroso‐4‐hydroxy‐5,6‐benzo‐coumarin when heated on a boiling water‐bath for about 10 minutes. The complex is soluble in 50% aqueous acetone medium and exhibits maximum absorption at 520nm. Beer's law is obeyed up to 10.5 ppm of iridium at 520 nm. Molar absorptivity is 1.28×104 litre mole‐1 cm‐t and the sensitivity of the colour reaction is 0.015 μg Ir(IV)/cm2. The composition of the complex is 1:3 as determined by Job's and logarithmic methods. Common anions and cations do not interfere in the determination.

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Complexation of 3-nitroso-4-hydroxy-5, 6-benzocoumarin with iron (II) is used to detect iron in presence of various ions present in the scheme of semimicro qualitative analysis. The method nnds application in detection of iron in alloys, inorganic salts ond various pharmaceutical products,

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Die empfindliche Reaktion der chelatbildenden Titelsubstanz mit Fe wird zum Nachweis von Spurenmengen von Fe neben anderen Ionen benutzt.