Extraction-Spectrophotometric and Theoretical Studies on a Ternary Complex Obtained from Vanadium(V) and 4-Nitrocatechol

Saravanska, Antoaneta D.; Racheva, Petya; Divarova, Vidka; Toncheva, Galya K.; Milcheva, Nikolina; Delchev, Vassil B.; Gavazov, Kiril B.

doi:10.1134/s0036023621120147

Cited by 3 publications

(5 citation statements)

References 30 publications

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“…Comparison of theoretical and experimental spectra of new complexes of this type is a convenient tool for clarifying their composition, structure, conformation, oxidation state of the central atom, etc. [ 37 , 38 ].…”

Section: Resultsmentioning

confidence: 99%

“…The values of the molar absorption coefficient and Sandell’s sensitivity were 3.50 × 10 4 L mol −1 cm −1 and 12.8 ng cm −2 , respectively. The logarithm of the extraction constant calculated by the mobile equilibrium method [ 38 ] ( Figure 6 d, curve 1) was log K ex = 5.35 ± 0.17. Statistically indistinguishable results for log K ex were obtained by two other methods: the Holme–Langmyhr method [ 44 ] (5.38 ± 0.10), and the Harvey–Manning method [ 45 ] (5.37 ± 0.18).…”

Section: Resultsmentioning

confidence: 99%

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Vanadium-Containing Anionic Chelate for Spectrophotometric Determination of Hydroxyzine Hydrochloride in Pharmaceuticals

et al. 2023

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Four azo dyes known to form anionic complexes with V(V) were investigated as potential liquid–liquid extraction–spectrophotometric reagents for the antihistamine medication hydroxyzine hydrochloride (HZH). A stable ion-association complex suitable for analytical purposes was obtained with 6-hexyl-4-(2-thiazolylazo)resorcinol (HTAR). The molar absorption coefficient, limit of detection, linear working range, and relative standard deviation in the analysis of real pharmaceutical samples (tablets and syrup) were 3.50 × 104 L mol−1 cm−1, 0.13 μg mL−1, 0.43–12.2 μg mL−1, and ≤2.7%, respectively. After elucidating the molar ratio in the extracted ion-association complex (HZH:V = 1:1), the ground-state equilibrium geometries of the two constituent ions—HZH+ and [VO2(HTAR)]−—were optimized at the B3LYP level of theory using 6-311++G** basis functions. The cation and anion were then paired in four different ways to find the most likely structure of the extracted species. In the lowest-energy structure, the VO2 group interacts predominantly with the heterochain of the cation. A hydrogen bond is present (V–O···H–O; 1.714 Å) involving the terminal oxygen of this chain.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Vanadium-Containing Anionic Chelate for Spectrophotometric Determination of Hydroxyzine Hydrochloride in Pharmaceuticals

et al. 2023

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“…The fact that the extraction constants (K) obtained by the above-mentioned methods (which operate with points located in different sections of the experimental saturation curve) are statistically identical, shows that the proposed equation is correct and there are no significant side processes. The spectral characteristics of the ion-association complex in the visible range are determined mainly by its anionic part [27]. Therefore, it is interesting to make a comparison between the experimental spectrum and simulated spectra of different isomers of the complex anion [Mo VI O 2 (OH) 2 (4NC)] 2− .…”

Section: Extraction Constant Distribution Ratio and Fraction Extractedmentioning

confidence: 99%

“…The spectral characteristics of the ion-association complex in the visible range determined mainly by its anionic part [27]. Therefore, it is interesting to make a comp son between the experimental spectrum and simulated spectra of different isomers of complex anion [Mo VI О2(OH)2(4NC)] 2− .…”

Section: Ground-state Equilibrium Geometries Of the Anionic Part Spec...mentioning

confidence: 99%

“…The aim of the present work is to develop a sensitive and selective extractive spectrophotometric procedure for the determination of molybdenum in steels and potable waters with 4-nitrocatechol (4NC) and benzalkonium chloride (BZC). An effective ligand for the formation of colored complexes that are attractive for analytical applications is 4-nitrocatechol [24][25][26][27]. Benzalkonium chloride is a mixture of alkyl dimethyl benzyl ammonium chlorides [28,29], with an average molar mass of 360 g mol −1 .…”

Section: Introductionmentioning

confidence: 99%

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Spectrophotometric Determination of Molybdenum(VI) as a Ternary Complex with 4-Nitrocatechol and Benzalkonium Chloride

et al. 2022

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A new liquid—liquid extraction system for molybdenum(VI) was studied. It contains 4-nitrocatechol (4NC) as a complexing chromogenic reagent and benzalkonium chloride (BZC) as a source of heavy cations (BZ+), which are prone to form chloroform-extractable ion-association complexes. The optimum conditions for the determination of trace molybdenum(VI) were found: concentrations of 4NC and BZC (7.5 × 10−4 mol dm−3 and 1.9 × 10−4 mol dm−3, respectively), acidity (3.75 × 10−2 mol dm−3 H2SO4), extraction time (3 min), and wavelength (439 nm). The molar absorptivity, limit of detection, and linear working range were 5.5 × 104 dm3 mol−1 cm−1, 5.6 ng cm−3, and 18.6–3100 μg cm−3, respectively. The effect of foreign ions was examined, and the developed procedure was applied to the analysis of synthetic mixtures and real samples (potable waters and steels). The composition of the extracted complex was 1:1:2 (Mo:4NC:BZ). Three possible structures of its anionic part [MoVI(4NC)O2(OH)2]2− were discussed based on optimizations at the B3LYP/3-21G level of theory, and simulated UV/Vis absorption spectra were obtained with the TD Hamiltonian.

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A Novel Bimetal Cu–Fe Nano-Silica Catalyst Synthesis by Supercritical Method and Its High Catalytic Activity for Phenol Hydroxylation

Xie

Xiang

et al. 2022

Russ J Gen Chem

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Extraction-Spectrophotometric and Theoretical Studies on a Ternary Complex Obtained from Vanadium(V) and 4-Nitrocatechol

Cited by 3 publications

References 30 publications

Vanadium-Containing Anionic Chelate for Spectrophotometric Determination of Hydroxyzine Hydrochloride in Pharmaceuticals

Vanadium-Containing Anionic Chelate for Spectrophotometric Determination of Hydroxyzine Hydrochloride in Pharmaceuticals

Spectrophotometric Determination of Molybdenum(VI) as a Ternary Complex with 4-Nitrocatechol and Benzalkonium Chloride

A Novel Bimetal Cu–Fe Nano-Silica Catalyst Synthesis by Supercritical Method and Its High Catalytic Activity for Phenol Hydroxylation

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