Azo Derivative of Pyrogallol as a New Reagent for Spectrophotometric Determination of Molybdenum

DOI

10.2991/978-94-6239-668-5_29How to use a DOI?

Keywords

spectrophotometry; molybdenum determination; pyrogallol azo derivative; 4-[(4-fluorophenyl)diazenyl]-1,2,3-trihydroxybenzene; antipyrine; 4-aminoantipyrine

Abstract

An azo derivative of pyrogallol, 4-[(4-fluorophenyl)diazenyl]-1,2,3-trihydroxybenzene, is proposed as a new organic reagent for the spectrophotometric determination of molybdenum(VI) in the presence of antipyrine and 4-aminoantipyrine. The optimal conditions for the formation of the binary Mo–R complex were established as pH 1 and λmax = 490 nm. The addition of antipyrine and 4-aminoantipyrine leads to the formation of mixed-ligand complexes in acidic media, accompanied by bathochromic shifts of the absorption maxima and increased color intensity. In the presence of antipyrine and 4-aminoantipyrine, the absorption maxima are observed at 505 and 510 nm, respectively, in 0.2 N HCl.

The formation of mixed-ligand complexes results in higher molar absorptivity and improved detection limits. Beer’s law is obeyed over the concentration ranges 0.384–4.94 µg/mL for the Mo–R complex and 0.294–7.36 µg/mL for the mixed-ligand systems. The proposed method was successfully applied to the determination of molybdenum in standard alloy samples.

Copyright

© 2026 The Author(s)

Open Access

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TY  - CONF
AU  - Sevil A. Maqsudova
AU  - Chinare A. Mammadova
AU  - Gulshen. R. Mugalova
AU  - Famil M. Chiragov
PY  - 2026
DA  - 2026/05/14
TI  - Azo Derivative of Pyrogallol as a New Reagent for Spectrophotometric Determination of Molybdenum
BT  - Proceedings of the International Conference on Current Problems in Engineering and Applied Sciences (ICCPEAS 2025)
PB  - Atlantis Press
SP  - 264
EP  - 272
SN  - 2352-5401
UR  - https://doi.org/10.2991/978-94-6239-668-5_29
DO  - 10.2991/978-94-6239-668-5_29
ID  - Maqsudova2026
ER  -