A series of oxo-vanadium(IV) complexes containing mixed ligands of poly(pyrazolyl)borate and organic carboxylic acid: Synthesis, structural characterization and primary study of bromination reaction activities

Zhao, Haiyan; Zhang, Yuan Hong; Ye, Xing; Li, Zhangpeng; Cao, Yanyan; Ge, Maofa; Zeng, Xiangfeng; Niu, Shuyun

doi:10.1016/j.ica.2009.06.005

Cited by 21 publications

(7 citation statements)

References 62 publications

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“…Different methodologies were employed, and different types of data were obtained. Li et al demonstrated the reactivity of scorpionate oxidovanadium(IV)-carboxylate complexes showing only the modifications observed in the UV/Vis spectra [13], and similar studies were performed for oxidovanadiumpoly (pyrazolyl)boratecarboxylate complexes [14] and a series of oxidovanadium (IV) complexes containing poly (pyrazolyl) borate and organic carboxylic acid as ligands [15]. The literature also showed studies involving kinetic data for copper [5,16] and vanadium complexes [12,[17][18][19][20][21].…”

Section: Resultsmentioning

confidence: 92%

Vanadium Compounds as Biocatalyst Models

Parente

Williams

Ferrer

2019

Biol Trace Elem Res

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Peroxidovanadium(V) and oxidovanadium(IV) compounds have been tested as peroxidase-similar compounds. Their catalytic performance was tested on phenol red and pyrogallol substrates. Bromination kinetic studies revealed Michaelis-Menten behavior with respect to phenol red for both complexes. Catalytic efficiency is~10 4 M −1 min −1 . Both vanadium complexes showed the capacity to oxidize pyrogallol, but only the oxidovanadium (IV) complex follows Michaelis-Menten kinetics with respect to this substrate (K m = 1.05 × 10 -3 M). Peroxidovanadium(V) complex displayed a more complex mechanism, and further studies became necessary to elucidate it. The structure-activity relationship was also assessed.

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Section: Resultsmentioning

confidence: 92%

Vanadium Compounds as Biocatalyst Models

Parente

Williams

Ferrer

2019

Biol Trace Elem Res

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“…5). This complex (NBT) 2 [VO(OH) 2 L 2 ] is extracted in more acidic media than all of the other V-PAR ternary complexes with mono- [30] and ditetrazolium salts investigated. Hence it is the best prospect for further investigations.…”

Section: +mentioning

confidence: 99%

“…There has been much recent research interest in vanadium connected with a number of developments concerning industry, the environment, and medicine [1][2][3][4][5][6][7][8][9][10][11]. Vanadium has dual character depending on its concentration; it easily switches between the oxidation states +5 and +4 (which, along with +3, are the oxidation states of naturally occurring vanadium compounds) [1].…”

Section: Introductionmentioning

confidence: 99%

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Ternary complexes of vanadium(IV) with 4-(2-pyridylazo)-resorcinol (PAR) and ditetrazolium chlorides (DTC)

Genç

Gavazov²,

Türkyılmaz

2010

Open Chemistry

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Complex formation and liquid-liquid extraction have been studied for ternary complexes of vanadium(IV) with 4-(2-pyridylazo)-resorcinol (PAR) and ditetrazolium chlorides (DTC) in a water-chloroform medium. The specific ditetrazolium compounds investigated were i) 3,3′-(4,4′-biphenylene)-bis(2,5-diphenyl-2H-tetrazolium) chloride (Neotetrazolium chloride, NTC); ii) 3,3′-(3,3′-dimetoxy-4,4′-biphenylene)-bis(2,5-diphenyl-2H-tetrazolium) chloride (Blue Tetrazolium chloride, BTC); and iii) 3,3′-(3,3′-dimetoxy-4,4′-biphenylene)-bis[2-(4-nitrophenyl)-5-phenyl-2H-tetrazolium] chloride (Nitro Blue Tetrazolium chloride, NBT). Molar absorptivity coefficients and the composition of the complexes have been calculated. Association constants (β) have also been obtained for the interactions between the vanadium(IV) — PAR anionic chelates [VO(PAR)2]2− (I) and [VO(OH)2(PAR)2]4− (II), and ditetrazolium cations (DT2+). Some special features of NBT as an extraction-spectrophotometric reagent for vanadium(IV) have been discussed. Unlike NTC and BTC which form complexes with both I and II, NBT associates only with II. The pH interval for complete extraction of (NBT2+)2[VO(OH)2(PAR)2] is broader and allows work at lower pH values the other ion-associates of V(IV,V)-PAR that were studied. NBT is -therefore the appropriate reagent both for direct V(IV) determination and for V(IV)/V(V) separation. Some additional characteristics for the V(IV)-PAR-NBT-water-chloroform system have been determined: extraction constant, distribution constant, recovery factor, limit of detection and limit of quantification. Beer’s law is valid up to 1.4 μg mL−1 vanadium(IV) with molar absorptivity coefficient of 3.55×104 L mol−1 cm−1 at λmax=559 nm.

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“…[ 46,47 ] Hydrotris(3,5‐dimethylpyrazolyl)borate is widely used in the design of functional molecules, catalysis, liquid crystal materials, electronic devices and biomimetic chemistry. [ 48–50 ]…”

Section: Introductionmentioning

confidence: 99%

Synthesis, characterisation and biological activities of mixed ligand oxovanadium (IV) complexes derived from N,N‐diethyl‐N′‐para‐substituted‐benzoylthiourea and hydrotris(3,5‐dimethylpyrazolyl)borate

Al‐abbasi

Tahir

Kayed

et al. 2022

Applied Organom Chemis

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A series of oxovanadium (IV) complexes namely, [Tp*VOL1], [Tp*VOL2], [Tp*VOL3], [Tp*VOL4] and [Tp*VOL5] (where Tp = hydrotris(3,5‐dimethylpyrazolyl)borate, HL1 = 1‐benzoyl‐3,3‐diethylthiourea, HL2 = 1‐(4‐chlorobenzoyl)‐3,3‐diethylthiourea, HL3 = 1,1‐diethyl‐3‐(4‐methoxybenzoyl)thiourea, HL4 = 1,1‐diethyl‐3‐(4‐nitrobenzoyl)thiourea, HL5 = N‐(diethylcarbamothioyl)biphenyl‐4‐carboxamide) were prepared and characterised on the basis of mass spectrometry, elemental analysis and spectroscopy techniques (IR, UV–Vis and electron paramagnetic resonance, EPR) and mass spectrometry. The crystal structure of [Tp*VOL3] was elucidated from single crystal X‐ray diffraction study and the crystals adopted a triclinic system with a P‐1 (Z = 2) space group and unit cell parameters of a = 10.4953(4), b = 11.5290(5) and c = 15.0656(7) Å. The cyclic voltammetry showed a reversible oxidation of V (IV)/V(V) at about 0.50 V (vs Fc+/Fc). The HOMO and LUMO of benzoylthiourea were established by theoretical calculation based on DFT level using B3LYP method and a double numeric plus polarisation (DNP) basis set. The in vitro tests for antimicrobial activity showed that the complexes have a moderate inhibitory effect. The complex [Tp*VOL1] exhibited cytotoxic activity against the human hepatocellular carcinoma cell line (HepG2) at the concentration of 20 mg ml−1. However, no cytotoxic activity was observed against the Chang liver cells.

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A series of oxo-vanadium(IV) complexes containing mixed ligands of poly(pyrazolyl)borate and organic carboxylic acid: Synthesis, structural characterization and primary study of bromination reaction activities

Cited by 21 publications

References 62 publications

Vanadium Compounds as Biocatalyst Models

Vanadium Compounds as Biocatalyst Models

Ternary complexes of vanadium(IV) with 4-(2-pyridylazo)-resorcinol (PAR) and ditetrazolium chlorides (DTC)

Synthesis, characterisation and biological activities of mixed ligand oxovanadium (IV) complexes derived from N,N‐diethyl‐N′‐para‐substituted‐benzoylthiourea and hydrotris(3,5‐dimethylpyrazolyl)borate

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