320
Volume 5, Issue 10: Special Issue
(EJAR)
ISSN: 2181-2020
MPHAPP
THE 6TH INTERNATIONAL SCIENTIFIC AND PRACTICAL
CONFERENCE
“
MODERN PHARMACEUTICS: ACTUAL
PROBLEMS AND PROSPECTS
”
TASHKENT, OCTOBER 17, 2025
in-academy.uz
SPECTROPHOTOMETRIC DETERMINATION OF TRACE AMOUNTS OF
SILVER(I) IONS USING H-RESORCINOL
1
Tojiboyeva F.M.
1
Chulpanov K.A.
2
Smanova Z.A.
¹Tashkent Pharmaceutical Institute, Tashkent city, Republic of Uzbekistan
²National University of Uzbekistan, Tashkent city, Republic of Uzbekistan
https://doi.org/10.5281/zenodo.17336892
Relevance:
A new organic reagent, H-resorcinol, was employed as a highly sensitive, selective,
and rapid-acting reagent for the determination of silver (I) ions. The interaction of silver (I) with H-
resorcinol occurs through the formation of a stable coordination bond. At pH = 10, an ammonia buffer
solution was used as a background electrolyte, resulting in the formation of a 1:1 (silver:H-resorcinol)
molar ratio complex. This approach is of particular importance, as the reliable and selective
determination of trace silver ions holds significant analytical value in environmental monitoring,
pharmaceutical analysis, and industrial quality control, where the accurate detection of even very low
concentrations of silver is essential.
Purpose of the study:
The determination of Silver (I) ion with H-resorcinol as an organic
reagent expands the possibilities of analytical chemistry. The IR spectrum of the obtained complex
confirmed the coordination bond formation.
Materials and methods:
A spectrophotometric microanalytical method was applied. The
complex formation was carried out at pH=10, in an ammonia buffer solution. The composition of the
complex was studied using IR spectroscopy. The IR spectrum was analyzed by studying the main
vibrations (stretching and deformation vibrations), and the coordination of silver was confirmed
through group vibrations.
Results:
The IR spectrum of the complex showed the following absorption bands: 3327 cm⁻¹
(broad peak, N–H stretching vibration), 2921 cm⁻¹ and 2853 cm⁻¹ (aliphatic C–H stretching
vibration), 2241 cm⁻¹ (–C≡N stretching vibration), 1651 cm⁻¹ and 1541 cm⁻¹ (C=O and C=N
stretching vibrations), 1493 cm⁻¹ and 1339 cm⁻¹ (aromatic C=C and C–N stretching vibrations), 1193
cm⁻¹ and 1036 cm⁻¹ (C–O–C and C–N stretching vibrations), 813 cm⁻¹, 596 cm⁻¹, 509 cm⁻¹, and 493
cm⁻¹ (metal–ligand vibrations, Ag–N and Ag–O coordination bonds). These results confirm the
coordination of silver ions with the ligand (H-resorcinol)
321
Volume 5, Issue 10: Special Issue
(EJAR)
ISSN: 2181-2020
MPHAPP
THE 6TH INTERNATIONAL SCIENTIFIC AND PRACTICAL
CONFERENCE
“
MODERN PHARMACEUTICS: ACTUAL
PROBLEMS AND PROSPECTS
”
TASHKENT, OCTOBER 17, 2025
in-academy.uz
Conclusions:
H-resorcinol is a suitable organic reagent for the determination of silver (I) ions.
The obtained IR spectral data confirmed the coordination of silver ions with the functional groups of
H-resorcinol, mainly via Ag–N and Ag–O coordination bonds. Due to the high sensitivity and
selectivity of this method, silver (I) ion can be determined rapidly and accurately, even in trace
amounts.
C:\Users\BRUKER\Documents\Bruker\OPUS_8.7.10\DATA\MEAS\5-N.0 5-N Instrument type and / or accessory
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