Spectrophotometric study of interaction of <i style="mso-bidi-font-style:normal">o</i>-methylphenyl thiourea with iridium(III) and development of a precise determination method from hydrochloric acid media

Abstract

A spectrophotometric determination of iridium(III) is studied using <i style="mso-bidi-font-style:normal">o</i>-methylphenyl thiourea (OMPT). Trivalent iridium has been determined spectrophotometrically as its 1:1 [iridium(III):OMPT] complex in aqueous hydrochloric acid media (0.6 M). The complex exhibits maximum absorption from 512 nm to 522 nm with molar absorptivity 0.663 × 10³Lmol^-1cm^-1and sandell’s sensitivity 0.289 µg of iridium(III) cm^-2; beer’s law is obeyed up to 300 µg/mL.The relative standard deviation for ten replicate samples at 40 µg/mL level of iridium(III) is found to be 0.54 and the limit of detection of the method is 0.018 µg/mL. Iridium(III)-OMPT complex is found stable for more than 8 days.