115-39-9Relevant academic research and scientific papers
Dinuclear vanadium complexes with rigid phenylpolycarboxylate ligands: Synthesis, structure, and catalytic bromination reaction with potential detection of hydrogen peroxide
Zhang, Rui,Zhang, Xiao-Xi,Bai, Feng-Ying,Chen, Chen,Guan, Qing-Lin,Hou, Ya-Nan,Wang, Xuan,Xing, Yong-Heng
, p. 1613 - 1628 (2014)
Vanadium complexes (VO)2(2,2′-bipy)2(bta) (H2O)2 (1) and (VO)2(1,10-phen) 2(bta)(H2O)2 (2) (H4bta = 1,2,4,5-benzenetetracarboxylic acid, 2,2′-bipy = 2,2-bipyridine and 1,10-phen = 1,10-phenanthroline) have been synthesized by the reaction of V 2(SO4)3, H4bta, 2,2′-bipy (for 1) and 1,10-phen (for 2) by hydrothermal methods. The complexes were characterized by elemental analysis, IR, UV-vis, thermogravimetric analyses, and single-crystal X-ray diffraction. Structural analyses indicate that 1 and 2 are both VO-bta-N-heterocycle system complexes. The central vanadium is coordinated by N2O4 donors to form a distorted octahedral geometry. The complexes exhibit catalytic bromination activity in a single-pot reaction with conversion of phenol red to bromophenol blue in a mixed solution of H 2O-DMF at 30 ± 0.5°C with pH 5.8, indicating that they can be considered as a functional model of vanadium-dependent haloperoxidases. The practical application of H2O2 detection has also been studied. 2014
Synthesis, structure, and catalytic bromination of supramolecular oxovanadium complexes containing oxalate
Chen, Chen,Bai, Feng-Ying,Zhang, Rui,Song, Ge,Shan, Hui,Xing, Na,Xing, Yong-Heng
, p. 671 - 688 (2013)
Three supramolecular complexes, [VO(phen)(C2O 4)(H2O)]·CH3OH (1) [(VO) 2(u2-C2O4)(C2O 4)2(H2O)2]·L·H 2O (2), and [(4,4′-bipyH2)0.5] +[VO2(2,6-dipic)]-·2H2O (3) (phen = 1,10-phenanthroline 4,4′-bipy = 4,4′-bipyridine, 2,6-dipic = 2,6-pyridinedicarboxylic, L = 1,4-bis((3,5-dimethyl-1H-pyrazol-1-yl)methyl) benzene), have been prepared and characterized by elemental analysis, IR, and UV-vis spectroscopy and single-crystal diffraction analysis. Structural analysis shows that the three complexes all contain carboxylate and V=O moiety; vanadium of 1 and 2 are six coordinate with distorted octahedral geometry with N 2O4 and O6 donor sets, respectively, while 3 is five coordinate with distorted trigonal bipyramidal geometry with a NO 4 donor set. The complexes exhibit catalytic bromination activity in the single-pot reaction for the conversion of phenol red to bromophenol blue in H2O-DMF at 30 ± 0.5 C with pH 5.8, indicating that they can be considered as functional model vanadium-dependent haloperoxidases. In addition, electrochemical behaviors are also studied.
Development of a multifunctional biomimicking l-cysteine based oxovanadium(IV) complex: Synthesis, DFT calculations, bromo-peroxidation and nuclease actIVity
Saha, Urmila,Mukherjea, Kalyan K.
, p. 94462 - 94473 (2015)
An oxovanadium complex [VO(sal-l-cys)(phen)] (sal-l-cys = Schiff base derived from salicylaldehyde and l-cysteine; phen = 1,10-phenanthroline) has been synthesized and characterized by spectroscopic studies (IR, UV-vis, ESI-MS and EPR studies). The structure of the complex has been optimized by density functional theory (DFT) calculations. Time-dependent DFT (B3LYP) calculations were used to establish and understand the nature of the electronic transitions observed in UV-vis spectra of the ligand and the complex. The multifunctionality of this oxovanadium complex has been exhibited by the application of it as a catalyst in peroxidative bromination of phenol red to demonstrate vanadium dependent bromoperoxidase activity, whereas nuclease activity has been established by DNA cleavage. The interaction of DNA with this structurally characterized oxovanadium complex has been studied by various physicochemical tools like UV-vis, fluorescence, and viscosity measurement studies. The intrinsic binding constant of the complex with DNA has been determined by electronic absorption studies and calculated to be (3.51 ± 0.02) × 104 M-1. The spectroscopic studies and the viscosity measurements indicate that the complex binds CT DNA by an intercalative mode. The ability of the complex to induce DNA cleavage was studied by gel electrophoresis techniques. The complex has been found to promote cleavage of pUC19 plasmid DNA from the super coiled (SC) form I to nicked coiled (NC) relaxed form II.
Ionization and Tautomerism of Hydroxyxanthenes and Some Other Dyes in Ethanol
Mchedlov-Petrosyan
, p. 267 - 274 (2003)
Protolytic equilibria of hydroxyxanthene dyes, Fluorescein and Eosin, as well as of some related compounds, in ethanol were studied by spectrophotometry. Stepwise ionization and tautomeric equilibrium constants were determined.
Bromoperoxidase mimic as catalysts for oxidative bromination - Synthesis, structures and properties of the diversified oxidation state of vanadium(iii, iv and v) complexes with pincer N-heterocycle ligands
Chen, Chen,Sun, Qiao,Ren, Dong-Xue,Zhang, Rui,Bai, Feng-Ying,Xing, Yong-Heng,Shi, Zhan
, p. 5561 - 5573 (2013)
Novel oxovanadium complexes (VO)2(bpz*T-O) (1), VO(bpz*eaT)(SCN)2 (2), V2(bpz*eaT) 2(μ2-C2O4)(C2O 4)2 (3), [VO(SO4)(bpz*P)(H 2O)]·H2O (4) and VO(SO4)(bpz*P-Me) (H2O) (5) (bpz*T-O: 4,6-bis(3,5-dimethylpyrazol-1-yl)-1,3,5- triazin-2-olate, bpz*eaT: 2,4-bis(3,5-dimethyl-1H-pyrazol-1-yl)-6- diethylamino-1,3,5-triazine, bpz*P: 2,6-bis(5-methyl-pyrazol-3-yl) pyridine, bpz*P-Me: 2,6-bis(1,5-dimethyl-pyrazol-3-yl)pyridine), were synthesized by the reaction of V2(SO4)3- VOSO4-VO(acac)2 and various pincer N-heterocyclic ligands with solution or hydrothermal methods. The structures of all the complexes were characterized by elemental analysis, IR and UV-vis spectroscopy and single-crystal diffraction analysis. Furthermore, thermogravimetric analyses (TG) and quantum chemistry calculations were also performed. Structural analyses reveal that the vanadium atom has a distorted trigonal bipyramidal geometry with a N3O2 donor set in 1; distorted octahedral geometry in 2, 4 and 5 with donor sets of N5O, N3O3 and N3O3, respectively; a distorted pentagonal bipyramidal geometry with a N3O4 donor set in 3. In addition, the five new complexes with abundant intro- and inter-hydrogen bonding interactions exhibited bromination catalytic activity in a single-pot reaction of the conversion of phenol red to bromophenol blue in a mixed solution of H 2O-DMF at a constant temperature of 30 ± 0.5°C with a buffer solution of NaH2PO4-Na2HPO4 (pH = 5.8), indicating that they can be considered as a potential functional model of bromoperoxidase. The Royal Society of Chemistry 2013.
Polyoxidovanadate complexes: synthesis, structures and catalytic oxidative bromination of phenol red
Lin, Xiao-Meng,Feng, Xiao-Dong,Wang, Yang,Xing, Yong-Heng,Sun, Li-Xian,Wei, Si-Yue,Shi, Zhan
, p. 44 - 59 (2017)
By selecting appropriate ligands, two polyoxidovanadate complexes, [Ni(en)2]3[V18O42Cl]·7H2O·2H3O+ (1) and [H2N(CH3)2]3[PV14O42]·2TMP·6H3O+ (2), have been synthesized at different pH values using V2(SO4)3, Ni(CH3COO)2, and H6TTHA (for 1), VO(acac)2 and TPP (for 2) (en?=?C2H8N2, TPP?=?thiamine pyrophosphate, TMP?=?thiamine monophosphate, H6TTHA?=?1,3,5-triazine-2,4,6-triamine hexaacetic acid). The complexes have been characterized by elemental analysis, IR spectroscopy, thermogravimetric analysis (TG), and single crystal X-ray diffraction. The complexes catalyze the oxidation of the organic substrate phenol red in the presence of H2O2 and bromide, and the reaction system is considered as a model for hydrogen peroxide determination. The reaction rate constants (k) for 1 and 2 are calculated as 3.729?×?103 and 4.083?×?103 (mol?L)?2?s?1. The maximum conversion rate of phenol red for 1 is 83.32%, while for 2 is 81.12%.
Experimental and theoretical studies on vanadium bromoperoxidase activity of alkyne arm dioxidovanadium(V) complex: Crystal structure, spectral studies, and DFT calculations
Neelakantan,Balakrishnan, Chithiraivel,Kowsalya,Selvarani
, p. 191 - 199 (2018)
The alkyne arm bearing dioxidovanadium(V) complex was synthesized by the reaction of vanadium sulphate, 1-[2-hydroxy-4-(prop-2-yn-1-yloxy)phenyl]ethanone and propane-1,2-diamine. The synthesized complex was characterized by various spectral techniques and its structure was determined using single-crystal X-ray diffraction analysis. Vanadium centre has square-pyramidal based geometry with an axial oxido ligand and the equatorial positions are occupied by another oxido ligand and phenolato oxygen, imine nitrogen and free amine nitrogen atoms. DFT and TD-DFT calculations were examined to identify the electronic structure, and electronic transitions of the complex observed in the absorption spectra. The percentage of intermolecular interactions in the crystal structure has been evaluated by 3D Hirshfeld surfaces and 2D fingerprint plots. The C–H?π and intermolecular interactions of the complex were examined using Bader's theory of QTAIM by ADF 2017. The dioxidovanadium(V) complex mimics as an efficient vanadium-dependent bromoperoxidase towards the bromination of phenol red in acetonitrile medium at room temperature.
Synthesis, characterization, crystal structure, and reactivity of heterobimetallic dioxovanadium(V) complexes containing multidentate hydrazone ligands
Kurbah, Sunshine D.,Kumar, Arvind,Sanentiba Ozukum,Syiemlieh, Ibanphylla,Lal, Ram A.
, p. 2969 - 2985 (2017)
Two new heterobimetallic complexes of the composition [(VO2)2(μ3-slsch){Na2(μ-H2O)2(H2O)2}]n (1) and [(VO2)2(μ3-npsch){Na2(μ-H2O)2(H2O)2}(DMF)]n (2) were obtained by reaction of the ligand and vanadium pentoxide in a 1:1 molar ratio in methanol in the presence of Na2CO3 (2 equivalents). The complexes obtained were characterized using various spectroscopic studies. The structures of both the complexes were established by single crystal X-ray crystallographic study. We have also explored the catalytic behavior of the complexes in oxidative bromination of phenol red, which is the bio-inspired reaction catalyzed by an enzyme haloperoxidase.
Mimicking vanadium haloperoxidases: Vanadium(iii)-carboxylic acid complexes and their application in H2O2 detection
Feng, Xiao Dong,Zhang, Xiao Xi,Wang, Zhi Nan,Song, Jian,Xing, Yong Heng,Bai, Feng Ying
, p. 1222 - 1229 (2016)
Vanadium(iii) complexes [V(2,6-pdc)2(H2O)2]·2H2O (1) and V(2,6-pdc)(htba)(H2O)2 (2), (2,6-pdc = 2,6-pyridinedicarboxylic acid, htba = 2-acetoxy-4-trifluoromethylbenzoic acid) have been synthesized by the reaction of V2(SO4)3 with 2,6-pdc (for 1) or 2,6-pdc and htba (for 2) under hydrothermal conditions at 120 °C for 36 hours. Because the vanadium(iii) was easily oxidized into higher oxidation states, we included the reducing agent vitamin C to protect the vanadium(iii) center. The complexes were characterized by elemental analysis, IR and UV-vis spectroscopy, and single-crystal X-ray diffraction. Structural analysis revealed that the central metal V atoms in the complexes 1 and 2 were seven-coordinate, forming pentagonal bipyramid geometries. The complexes catalyzed the bromination of the organic substrate phenol red in the presence of H2O2, bromide and buffer. Compared with vanadium complexes having other oxidation states, the vanadium(iii) complexes had better catalytic activity (the maximum reaction rate constant was 2.424 × 102k(mol L-1)-2 s-1). The mimicking vanadium haloperoxidases also overcame some serious disadvantages of natural enzymes. Therefore, the reaction system described herein can be considered as an effective model for hydrogen peroxide determination.
Novel vanadium complexes with rigid carboxylate ligands: Synthesis, structure and catalytic bromine dynamics of phenol red
Wang, Yang,Lin, Xiao-Meng,Bai, Feng-Ying,Sun, Li-Xian
, p. 379 - 386 (2017)
In this work, by selecting appropriate ligands, novel vanadium complexes [VIVO(2,6-pdc)(Phen)]·3H2O (1) and [(VIVO)(C5H5N2O2)2H2O]·2H2O (2) (2,6-pdc = 2,6-pyridinedicarboxylic acid, Phen = 1,10-Phenanthroline monohydrate) were synthesized by the reaction of V2(SO4)3, 2,6-pdc and Phen (for 1), VO(acac)2 and C5H6N2O2 (for 2) via solution or hydrothermal methods. Two complexes were characterized by elemental analysis, IR spectroscopy, thermogravimetric analysis (TG), UV-vis spectroscopy and the single crystal X-ray diffraction. Structural analyses reveal that the vanadium atom has distorted octahedral geometry in 1 and 2 with donor sets of N3O3 and N2O4, respectively. The complexes which catalyze the oxidation of the organic substrate phenol red in the presence of H2O2 and bromide exhibited catalytic bromination activity, and the reaction system is considered as an effective model for hydrogen peroxide determination. The reaction rate constant (k) for complexes 1 and 2 can be calculated as 2.13 × 102 and 2.64 × 102 (mol/L)?2s?1, respectively.
