SPECTROPHOTOMETRIC DETERMINATION OF TRACE AMOUNTS OF SILVER(I) IONS USING H-RESORCINOL

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 1Tojiboyeva F.M. 1Chulpanov K.A. 2Smanova Z.A. ¹Tashkent Pharmaceutical Institute, Tashkent city, Republic of Uzbekistan ²National University of Uzbekistan, Tashkent city, Republic of Uzbekistan e-mail: [email protected] 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 Hresorcinol 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 2/6/2025 3327.78 2921.86 2853.08 2241.40 2202.65 2186.14 2162.91 2026.53 1976.54 1920.50 1726.48 1651.83 1541.97 1449.17 1358.37 1193.33 1169.09 1036.31 813.42 724.63 650.56 619.83 539.81 514.48 493.83 434.04 500100015002000250030003500 Wavenumber cm-1 92 93 94 95 96 97 98 99 100 Transmittance [%] Page 1/1