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A New Reagent for Spectrophotometric Determination of Ir(IV): 5-[2-(4-Hydroxyphenyl)hydrazineylidene]-4-iminothiazolidin-2-one (HPIT)

Oleksandr Tymoshuk, Lesia Oleksiv, Orest Fedyshyn, Petro Rydchuk, Vasyl Matiychuk, Taras Chaban


The paper presents a new azolidone derivative – 5-[2-(4-hydroxyphenyl)hydrazineylidene]-4-iminothiazolidin-2-one (HPIT) studies and its interaction results with iridium(IV) ions. The Ir(IV) with this reagent in the pH = 5.0 without heating forms a stable complex (λmax = 328 nm). The stoichiometric ratio of Ir(IV) to the reagent in complex is 1:1. The molar absorptivity and Sandell’s sensitivity are 5.57×103 L mol-1 cm-1 and 0.034 µg cm-2 respectively. The calibration curve is linear in the range of 1.0-11.5 µg mL-1 of Ir(IV) (R = 0.9996). The limit of detection is 0.4 µg mL-1. Based on the conducted investigation a rapid and simple, spectrophotometric method for the determination of Ir(IV) using 5-[2-(4-hydroxyphenyl)hydrazineylidene]-4-iminothiazolidin-2-one as a chromophoric reagent was developed. The iridium(IV) was determined in various synthetic mixtures and alloys.


Iridium(IV); spectrophotometry; 5-[2-(4-hydroxyphenyl)hydrazineylidene]-4-iminothiazolidin-2-one; azolidones.

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Copyright (c) 2020 Lesia Oleksiv, Oleksandr Tymoshuk, Orest Fedyshyn, Petro Rydchuk, Vasyl Matiychuk, Taras Chaban

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