| Autor: |
Gavazov KB; Department of Chemical Sciences, Faculty of Pharmacy, Medical University of Plovdiv, 120 Buxton Bros Str., 4004 Plovdiv, Bulgaria., Racheva PV; Department of Chemical Sciences, Faculty of Pharmacy, Medical University of Plovdiv, 120 Buxton Bros Str., 4004 Plovdiv, Bulgaria., Saravanska AD; Department of Chemical Sciences, Faculty of Pharmacy, Medical University of Plovdiv, 120 Buxton Bros Str., 4004 Plovdiv, Bulgaria., Toncheva GK; Faculty of Chemistry, University of Plovdiv 'Paisii Hilendarskii', 24 Tsar Assen Str., 4000 Plovdiv, Bulgaria., Delchev VB; Faculty of Chemistry, University of Plovdiv 'Paisii Hilendarskii', 24 Tsar Assen Str., 4000 Plovdiv, Bulgaria. |
| Jazyk: |
angličtina |
| Zdroj: |
Molecules (Basel, Switzerland) [Molecules] 2023 Sep 20; Vol. 28 (18). Date of Electronic Publication: 2023 Sep 20. |
| DOI: |
10.3390/molecules28186723 |
| Abstrakt: |
Two new vanadium (V) complexes involving 6-hexyl-4-(2-thiazolylazo)resorcinol (HTAR) and tetrazolium cation were studied. The following commercially available tetrazolium salts were used as the cation source: tetrazolium red (2,3,5-triphenyltetrazol-2-ium;chloride, TTC) and neotetrazolium chloride (2-[4-[4-(3,5-diphenyltetrazol-2-ium-2-yl)phenyl]phenyl]-3,5-diphenyltetrazol-2-ium;dichloride, NTC). The cations (abbreviated as TT + and NTC + ) impart high hydrophobicity to the ternary complexes, allowing vanadium to be easily extracted and preconcentrated in one step. The complexes have different stoichiometry. The V(V)-HTAR-TTC complex dimerizes in the organic phase (chloroform) and can be represented by the formula [(TT + )[VO 2 (HTAR)]] 2 . The other complex is monomeric (NTC + )[VO 2 (HTAR)]. The cation has a +1 charge because one of the two chloride ions remains undissociated: NTC + = (NT 2+ Cl - ) + . The ground-state equilibrium geometries of the constituent cations and final complexes were optimized at the B3LYP and HF levels of theory. The dimer [(TT + )[VO 2 (HTAR)]] 2 is more suitable for practical applications due to its better extraction characteristics and wider pH interval of formation and extraction. It was used for cheap and reliable extraction-spectrophotometric determination of V(V) traces in real samples. The absorption maximum, molar absorptivity coefficient, limit of detection, and linear working range were 549 nm, 5.2 × 10 4 L mol -1 cm -1 , 4.6 ng mL -1 , and 0.015-2.0 μg mL -1 , respectively. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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