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Spectrophotometric Determination of Iridium (IV) with 3‐Nitroso‐4‐Hydroxy‐5, 6‐Benzocoumarin
Author(s) -
Kohli Nitin,
Kohli R. M.,
Singh R. P.
Publication year - 1975
Publication title -
journal of the chinese chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.329
H-Index - 45
eISSN - 2192-6549
pISSN - 0009-4536
DOI - 10.1002/jccs.197500013
Subject(s) - chemistry , iridium , molar absorptivity , boiling , acetone , aqueous solution , absorption (acoustics) , coumarin , nitroso , spectrophotometry , nuclear chemistry , inorganic chemistry , analytical chemistry (journal) , chromatography , medicinal chemistry , organic chemistry , catalysis , physics , acoustics , optics
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 520 nm . Beer's law is obeyed up to 10.5 ppm of iridium at 520 nm . Molar absorptivity is 1.28×10 4 litre mole ‐1 cm ‐ t and the sensitivity of the colour reaction is 0.015 μg Ir(IV)/ cm 2 . 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.