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Journal articles on the topic 'Vanadium(IV) complexes'

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Published: 5 June 2025

Last updated: 24 June 2025

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1

Amante, Cristina, Ana Luísa De Sousa-Coelho, and Manuel Aureliano. "Vanadium and Melanoma: A Systematic Review." Metals 11, no. 5 (2021): 828. http://dx.doi.org/10.3390/met11050828.

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The application of metals in biological systems has been a rapidly growing branch of science. Vanadium has been investigated and reported as an anticancer agent. Melanoma is the most aggressive type of skin cancer, the incidence of which has been increasing annually worldwide. It is of paramount importance to identify novel pharmacological agents for melanoma treatment. Herein, a systematic review of publications including “Melanoma and Vanadium” was performed. Nine vanadium articles in several melanoma cells lines such as human A375, human CN-mel and murine B16F10, as well as in vivo studies, are described. Vanadium-based compounds with anticancer activity against melanoma include: (1) oxidovanadium(IV); (2) XMenes; (3) vanadium pentoxide, (4) oxidovanadium(IV) pyridinonate compounds; (5) vanadate; (6) polysaccharides vanadium(IV/V) complexes; (7) mixed-metal binuclear ruthenium(II)–vanadium(IV) complexes; (8) pyridoxal-based oxidovanadium(IV) complexes and (9) functionalized nanoparticles of yttrium vanadate doped with europium. Vanadium compounds and/or vanadium materials show potential anticancer activities that may be used as a useful approach to treat melanoma.

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2

Rojek, Joanna, Małgorzata Kozieradzka-Kiszkurno, Małgorzata Kapusta, et al. "The effect of vanadium(IV) complexes on development of Arabidopsis thaliana subjected to H2O2-induced stress." Functional Plant Biology 46, no. 10 (2019): 942. http://dx.doi.org/10.1071/fp18262.

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The impact of oxydiacetate oxidovanadium(IV) complexes on plants is currently unknown. This report demonstrates the influence of these complexes on Arabidopsis thaliana (L.) Heynh. In the presence of 10−6M vanadium(IV) complexes, plants proceeded through their entire life cycle, with the occurrence of proper morphological and cytological organisation of leaf and root tissues. The addition of 10−1M H2O2 caused root damage, leaf necrosis, and plant death at around the seventh day, due to the destruction of the root system. Pretreatment of the plants with 10−6M of vanadium(IV) compounds: VOSO4 and VO(oda), alleviated the effects of H2O2 to some extent. Plants pretreated with 10−6M vanadium(IV) complexes survived longer despite the presence of H2O2. Considering the higher rate of plant survival in the presence of VOSO4, and the relatively high photosynthetic parameters and anthocyanin contents in the cells, we conclude that this vanadium(IV) compound can have positive effects on plants that are grown under stress conditions.

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3

Preuss, Fritz, and Peter Werle. "Silanolato-Komplexe von Vanadium (III, IV) / Silanolato Complexes of Vanadium (III, IV)." Zeitschrift für Naturforschung B 57, no. 7 (2002): 726–30. http://dx.doi.org/10.1515/znb-2002-0702.

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Syntheses of the homoleptic trimethylsilanolato complexes V(OSiMe3)3 and V(OSiMe3)4 are described. The thiovanadium(V)compound VS(OSiPh3)3 (11) is formed from [V(OSiPh3)3- (THF)2] upon oxidation with elemental sulfur; 11 has been characterized by 51V NMR spectroscopy.

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4

Rosenthal, Esther C. E. "From vanadium(V) to vanadium(IV) - and backwards." Pure and Applied Chemistry 81, no. 7 (2009): 1197–204. http://dx.doi.org/10.1351/pac-con-08-08-32.

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With bidentate alkoxy alkoxide and alkoxy alcohol ligands, respectively, a series of oxovanadium complexes in the oxidation state +4 is synthesized starting from oxovanadium(V) compounds. The reaction of two or more equivalents of 2-methoxyethanol with VOCl3 in n-hexane yields a mixture of the monomeric oxovanadium(IV) complex cis-[VOCl2(HOCH2CH2OMe-κ2O)(HOCH2CH2OMe-κO1)] and the alkoxide-bridged oxovanadium(IV) dimer syn-[VOCl(µ-OCH2CH2OMe-κ2O)]2, which are separated by fractionated crystallization. The same reaction with 2-ethoxy- and 2-iso-propoxyethanol gives only the alkoxide-bridged oxovanadium(IV) dimers anti-[VOCl(µ-OCH2CH2OR-κ2O)]2 (R = Et, iPr). All alkoxide bridged oxovanadium(IV) dimers are furthermore obtained as decomposition products of the chloride-bridged oxovanadium(V) complexes [VO(µ-Cl)Cl(OCH2CH2OR-κ2O)]2 (R = Me, Et, iPr) by Cl2 elimination and react inversely with Cl2 to the vanadium(V) compounds.

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5

Nayak, Panisha, Manisha Nayak, Kiran Meena, and Sanjib Kar. "Oxo(corrolato)vanadium(iv) catalyzed epoxidation: oxo(peroxo)(corrolato)vanadium(v) is the true catalytic species." New Journal of Chemistry 46, no. 10 (2022): 4634–46. http://dx.doi.org/10.1039/d1nj06015e.

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6

Szklarzewicz, Janusz, Anna Jurowska, Maciej Hodorowicz, and Ryszard Gryboś. "Thermal and long period stability of series of V(V), V(IV) and V(III) complex with Schiff base ligands in solid state." Science, Technology and Innovation 4, no. 1 (2019): 30–36. http://dx.doi.org/10.5604/01.3001.0013.1547.

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The synthesis and physicochemical properties of three new complexes of vanadium at +5, +4 and +3 oxidation state are described and discussed. The octahedral surrounding of vanadium for V(III) complexes of [V(L1)(HL1)] general formula is filled with two ONO tridentate ligand L, for V(IV) one ONO ligand L, oxido ligand and 1,10-phenanthroline (phen) as a co-ligand are presented in complexes of [VO(L2)(phen)]. For V(V) the complexes of [VO2(L1)(solv)] type were formed. As ligands, the H2L Schiff bases were formed in reaction between 5-hydroxysalcylaldehyde and phenylacetic hydrazide (H2L1) and 3,5-dichlorosalicyaldehyde and 4-hydroxybenzhydrazide (L2). The magnetic moment measurements, in 8 year period, show, that V(III) complexes slowly oxidise to V(IV) with preservation of the nonoxido character of the complexes, while V(IV) complexes were found to be stable. The TG and SDTA measurements indicate, that thermal stability depends mainly on the oxidation state of vanadium. The less thermally stable are the V(V) complexes, while V(IV) and V(III) are stable up to ca. 200oC. In solution, at pH 2 (similar to that in human digestion system), again the V(IV) are the most stable, only at pH 7.0 V(III) complexes had higher stability. The most stable, thus best for pharmaceutical use, are V(IV) complexes.

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7

De Sousa-Coelho, Ana Luísa, Gil Fraqueza, and Manuel Aureliano. "Repurposing Therapeutic Drugs Complexed to Vanadium in Cancer." Pharmaceuticals 17, no. 1 (2023): 12. http://dx.doi.org/10.3390/ph17010012.

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Repurposing drugs by uncovering new indications for approved drugs accelerates the process of establishing new treatments and reduces the high costs of drug discovery and development. Metal complexes with clinically approved drugs allow further opportunities in cancer therapy—many vanadium compounds have previously shown antitumor effects, which makes vanadium a suitable metal to complex with therapeutic drugs, potentially improving their efficacy in cancer treatment. In this review, covering the last 25 years of research in the field, we identified non-oncology-approved drugs suitable as ligands to obtain different vanadium complexes. Metformin-decavanadate, vanadium-bisphosphonates, vanadyl(IV) complexes with non-steroidal anti-inflammatory drugs, and cetirizine and imidazole-based oxidovanadium(IV) complexes, each has a parent drug known to have different medicinal properties and therapeutic indications, and all showed potential as novel anticancer treatments. Nevertheless, the precise mechanisms of action for these vanadium compounds against cancer are still not fully understood.

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8

Smith, Kathryn I., Londa L. Borer, and Marilyn M. Olmstead. "Vanadium(IV) and Vanadium(V) Complexes of Salicyladimine Ligands." Inorganic Chemistry 42, no. 23 (2003): 7410–15. http://dx.doi.org/10.1021/ic034640p.

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9

Koleša-Dobravc, Tanja, Keiichi Maejima, Yutaka Yoshikawa, Anton Meden, Hiroyuki Yasui, and Franc Perdih. "Vanadium and zinc complexes of 5-cyanopicolinate and pyrazine derivatives: synthesis, structural elucidation and in vitro insulino-mimetic activity study." New Journal of Chemistry 41, no. 2 (2017): 735–46. http://dx.doi.org/10.1039/c6nj02961b.

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10

Koleša-Dobravc, Tanja, Keiichi Maejima, Yutaka Yoshikawa, Anton Meden, Hiroyuki Yasui, and Franc Perdih. "Bis(picolinato) complexes of vanadium and zinc as potential antidiabetic agents: synthesis, structural elucidation and in vitro insulin-mimetic activity study." New Journal of Chemistry 42, no. 5 (2018): 3619–32. http://dx.doi.org/10.1039/c7nj04189f.

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11

Begum, B., A. Sarker, AKM Lutfor Rahman, and NC Bhoumik. "Synthesis and characterization of mixed ligand catecholato-bis (diamine-mono-dithiocarbamato) vanadium (IV) complexes." Bangladesh Journal of Scientific and Industrial Research 52, no. 2 (2017): 89–96. http://dx.doi.org/10.3329/bjsir.v52i2.32913.

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Diamine-mono-dithiocarbamates are mono-basic bidentate ligand forming stable complexes with transition metals. Mixed ligand catecholato-bis (diamine-mono-dithiocarbamato) vanadium (IV) complexes were synthesized and characterized using FT-IR, UV-visible and 1H-NMR spectroscopic techniques. The formation of vanadium complexes was con?rmed by the disappearance of ?S-H band in the complexes which was present in the ligands and incidence of ?V-S and ?V-O band in FT-IR spectra of the complexes. The mono-dithiocarbamate with one uncoordinated ?NH/NH2 group was indicated by the presence of ?N-H vibrational band in both the ligands and complexes. In the 1H-NMR spectra, the peak for SH proton of ligands disappeared in the complexes suggest the formation of [VL2Cat] complex. Non-electrolytic nature of the synthesized complexes was established by their low molar conductance values. The +4 oxidation state of vanadium was con?rmed by the electronic spectra of the complexes. On the basis of all physico-chemical data, a six-coordinated octahedral structure has been suggested for catecholato-bis (diamine-mono-dithiocarbamato) vanadium (IV) complexes.Bangladesh J. Sci. Ind. Res. 52(2), 89-96, 2017

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12

M., SAIDUL ISLAM, BEGUM MOTAHERA, NATH ROY HARENDRA, and A. Q. M. HAROON S. "Hexacoordinated Mixed-ligand Complexes of Vanadium(IV) and Copper(II)." Journal of Indian Chemical Society Vol. 73, Aug 1996 (1996): 411–12. https://doi.org/10.5281/zenodo.5897734.

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Chemistry Department, Rajshahi University. Rajshahi 6205 Bangladesh <em>Manuscript received 6 Mav 1994. revised 17 November 1994. accepted 25 November 1994</em> Hexacoordinated Mixed-ligand Complexes of Vanadium(IV) and Copper(II)

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13

Preuss, Fritz, Monika Vogel, Uwe Fischbeck, et al. "Amido-tert-butylimido-vanadium(V)-Verbindungen. Darstellung, Reaktionen und 51V-NMR-spektroskopische Untersuchungen / Amido-tert-butylimidovanadium(V) Compounds. Synthesis, Reactions and 51V NMR Spectroscopic Studies." Zeitschrift für Naturforschung B 56, no. 11 (2001): 1100–1108. http://dx.doi.org/10.1515/znb-2001-1102.

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The reactions of tBuN = VCl2 · DME with LiX (X = NHtBu, NR2, OSiPh3, SR, Alkyl, Cp) have been studied. LiNHtBu and LiCH3 furnish the binuclear diamagnetic tert-butylimido-vanadium( IV) compounds [(μ-NtBu)2V2X4]; in all other cases only the vanadium(V) compounds tBuN=VX3 and tBuN=VCpCl2 formed by disproportionation reactions of vanadium(IV) can be isolated. The syntheses of various mononuclear amido tert-butylimido-vanadium(V) complexes as well as of the binuclear complexes [μ-NtBu)2V2(NtBu)2Cl2] and [(μ-0)V2(NtBu)2Cp2Cl2] are also described. All compounds obtained have been characterized by 51V NMR spectroscopy. tBuN=V(OMe)3 was investigated by X-ray diffraction analysis; the molecular structure has been found to be that of a binuclear vanadium(V) complex with two bridging methoxo ligands.

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14

Królicka, Agnieszka, Jerzy Zarębski, and Andrzej Bobrowski. "Application of Aminopolycarboxylic Complexes of V(IV) in Catalytic Adsorptive Stripping Voltammetry of Germanium." Chemosensors 10, no. 1 (2022): 36. http://dx.doi.org/10.3390/chemosensors10010036.

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In the review, voltammetric analytical procedures that employ vanadium(IV) and aminopolycarboxylic complexes of V(IV) are presented and discussed. The focus of the paper is on the mechanism of vanadium-catalyzed reactions responsible for the amplification of the analytical signal of Ge(IV). The analytical efficacy of different catalytic systems is compared, and the optimal parameters of the respective procedures are reported.

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15

Kurganskii, Ivan V., Evgeniya S. Bazhina, Alexander A. Korlyukov, et al. "Mapping Magnetic Properties and Relaxation in Vanadium(IV) Complexes with Lanthanides by Electron Paramagnetic Resonance." Molecules 24, no. 24 (2019): 4582. http://dx.doi.org/10.3390/molecules24244582.

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Vanadium(IV) complexes are actively studied as potential candidates for molecular spin qubits operating at room temperatures. They have longer electron spin decoherence times than many other transition ions, being the key property for applications in quantum information processing. In most cases reported to date, the molecular complexes were optimized through the design for this purpose. In this work, we investigate the relaxation properties of vanadium(IV) ions incorporated in complexes with lanthanides using electron paramagnetic resonance (EPR). In all cases, the VO6 moieties with no nuclear spins in the first coordination sphere are addressed. We develop and implement the approaches for facile diagnostics of relaxation characteristics in individual VO6 moieties of such compounds. Remarkably, the estimated relaxation times are found to be close to those of other vanadium-based qubits obtained previously. In the future, a synergistic combination of qubit-friendly properties of vanadium ions with single-molecule magnetism and luminescence of lanthanides can be pursued to realize new functionalities of such materials.

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16

Sakurai, Hiromu, Yoshitane Kojima, Yutaka Yoshikawa, Kenji Kawabe, and Hiroyuki Yasui. "Antidiabetic vanadium(IV) and zinc(II) complexes." Coordination Chemistry Reviews 226, no. 1-2 (2002): 187–98. http://dx.doi.org/10.1016/s0010-8545(01)00447-7.

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17

Islam, Mohammad K., Md Nuruzzaman, Rashedul I. Ripon, et al. "Synthesis, Characterization and Bioactivities of Some Novel Oxovanadium(IV) Glycinato Complexes." European Scientific Journal, ESJ 14, no. 21 (2018): 410. http://dx.doi.org/10.19044/esj.2018.v14n21p410.

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The novel oxovanadium(IV) complexes, [VIVO(GlyH)(Gly)]+ClO4 - .H2O (1), [VIVO(GlyH)(Gly)]+NO3 - .H2O (2), [VIVO(GlyH)(Gly)]+CH3COO- .H2O (3) were synthesized and characterized by FT-IR, UV-Vis and 1H NMR spectroscopic measurements. The cumulative spectroscopic assessment envisaged that, the complexes adopt a square pyramidal structure, in which the two glycine ligands coordinate to vanadium(IV) center in bidentate fashions conforming a homoleptic structure. The amino nitrogen and a carboxylato oxygen atom coordinate the vanadium(IV) center from both sides making a five members chelate by each side. All the complexes are stable in amorphous state and in aerobic and anaerobic solution. Significantly, all the complexes have the antifungal activities against Aspergillus niger and Penicillium notatum but ineffective against Candida tropicalis. No antibacterial activity was observed for the complexes against tested bacteria and unfortunately, they were found cytotoxic against brine shrimp bioassay.

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18

Genç, Fatma, Kiril Gavazov, and Murat Türkyilmaz. "Ternary complexes of vanadium(IV) with 4-(2-pyridylazo)-resorcinol (PAR) and ditetrazolium chlorides (DTC)." Open Chemistry 8, no. 2 (2010): 461–67. http://dx.doi.org/10.2478/s11532-009-0119-7.

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AbstractComplex 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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19

A. Almehizia, Abdulrahman, Mohamed A. Al-Omar, Ahmed M. Naglah, and Mashooq A. Bhat. "Metal-urea complexes as primary precursors to generate VO2, ZrO2, NbO2, TaO2, Ga2O3 and TeO2 oxides in the nanoscale range by thermal decomposition route." Bulletin of the Chemical Society of Ethiopia 38, no. 4 (2024): 1003–12. http://dx.doi.org/10.4314/bcse.v38i4.15.

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Six metal chlorides of vanadium, zirconium, niobium, tantalum, gallium, and tellurium (i.e., VCl3, ZrOCl2×8H2O, NbCl5, TaCl5, GaCl3, and TeCl4) were reacted with urea (referred to as U) in aqueous media at ~ 50 oC. The resulting metal-urea complexes were characterized using CHN elemental analyses, infrared (IR) spectroscopy, and thermogravimetry. After the synthesized metal-urea complexes were characterized, their ability to form stable metal oxides was examined. The vanadium(IV) oxide; VO2, zirconium(IV) oxide; ZrO2, niobium(IV) oxide, NbO2, tantalum(IV) oxide; TaO2, gallium(III) oxide; Ga2O3, and tellurium(IV) oxide; TeO2, were generated by the thermal decomposition route of the synthesized metal-urea complexes at low temperature 600 °C in static air atmosphere. The transmission electron microscopy (TEM) revealed that the oxides contain uniform spherical nanoparticles. KEY WORDS: Metal chloride, Metal-urea complex, Urea, FTIR, TEM Bull. Chem. Soc. Ethiop. 2024, 38(4), 1003-1012. DOI: https://dx.doi.org/10.4314/bcse.v38i4.15

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20

Francik, Renata, Jadwiga Kryczyk-Kozioł, Sławomir Francik, Ryszard Gryboś, and Mirosław Krośniak. "Bis(4,4′-dimethyl-2,2′-bipyridine)oxidovanadium(IV) Sulfate Dehydrate: Potential Candidate for Controlling Lipid Metabolism?" BioMed Research International 2017 (2017): 1–5. http://dx.doi.org/10.1155/2017/6950516.

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Vanadium is a trace element mainly connected with regulation of insulin metabolism which is particularly important in diabetes. In recent years, organic complexes of vanadium seem to be more interesting than inorganic salts. Nevertheless, the effect of vanadium on lipid metabolism is still a problematic issue; therefore, the main purpose of this study was to investigate the effect of 3 organic complexes of vanadium such as sodium (2,2′-bipyridine)oxidobisperoxovanadate(V) octahydrate, bis(2,2′-bipyridine)oxidovanadium(IV) sulfate dehydrate, and bis(4,4′-dimethyl-2,2′-bipyridine)oxidovanadium(IV) sulfate dihydrate in conjunction with high-fat as well as control diet in nondiabetes model on the following lipid parameters: total cholesterol, triglycerides, and high density lipoprotein as well as activity of paraoxonase 1. All of these parameters were determined in plasma of Wistar rats. The most significant effect was observed in case of bis(4,4′-dimethyl-2,2′ bipyridine)oxidovanadium(IV) sulfate dehydrate in rats fed with high-fat diet. Based on our research, bis(4,4′-dimethyl-2,2′-bipyridine)oxidovanadium(IV) sulfate dihydrate should be the aim of further research and perhaps it will be an important factor in the regulation of lipid metabolism.

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21

Kazek, Grzegorz, Monika Głuch-Lutwin, Barbara Mordyl, et al. "Cell-based Screening For Identification Of The Novel Vanadium Complexes With Multidirectional Activity Relative To The Cells And The Mechanisms Associated With Metabolic Disorders." Science, Technology and Innovation 4, no. 1 (2019): 47–54. http://dx.doi.org/10.5604/01.3001.0013.1047.

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In this study, 110 newly synthesized vanadium complexes from different structural groups were screened in three cell-based models representing the main target tissues for anti-diabetic drugs. In glucose utilization in C2C12 myocyte experiments, 93% of vanadium complexes were shown to have equal or greater activity than bis(maltolato)oxovanadium(IV) (BMOV), the methyl analog of bis(ethylmaltolato)oxovanadium(IV) (BEOV) which has been tested in clinical trials. Moreover, 49% and 50% of these complexes were shown to have equal or greater activity than BMOV in lipid accumulation in 3T3-L1 adipocytes and insulin secretion in RINm5F beta cell experiments, respectively. These results were the basis for the selection of compounds for the subsequent steps in the characterization of anti-diabetic properties. This study provides strong support for the application of screening cell-based assays with a phenotypic approach for the discovery of novel anti-diabetic drugs from the vanadium complex class. This is especially desirable due to the multiple and not fully defined mechanisms of action vanadium compounds.

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22

Hänninen, M. M., A. Peuronen, P. Damlin, V. Tyystjärvi, H. Kivelä, and A. Lehtonen. "Vanadium complexes with multidentate amine bisphenols." Dalton Trans. 43, no. 37 (2014): 14022–28. http://dx.doi.org/10.1039/c4dt01007h.

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23

MAURYA, R., and S. RAJPUT. "Synthesis and characterization of some vanadium(IV) and vanadium(V) complexes." Progress in Crystal Growth and Characterization of Materials 52, no. 1-2 (2006): 142–49. http://dx.doi.org/10.1016/j.pcrysgrow.2006.03.019.

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24

Schumann, Hans. "Zur Redoxchemie und Struktur von Oxovanadium(IV,V)-KompIexen mit substituierten Dibenzotetraaza[14]annulen Liganden / Redox Chemistry and Structure of Oxovanadium(IV.V) Complexes Containing Substituted Dibenzotetraaza[14]annulene Ligands." Zeitschrift für Naturforschung B 50, no. 10 (1995): 1494–504. http://dx.doi.org/10.1515/znb-1995-1010.

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The oxovanadium(IV) complexes LVO and L′VO (L = dianion of 5,14-dihydro-6,8,15.17- tetramethyldibenzo[b.i][1,4.8,11]tetraazacyclotetradecine. H2L, and L′ = dianion of 5,14-dihydro-6,15-dimethyl-8,17-diphenyldibenzo[b,i][1,4,8,11]tetraazacyclotetradecine, H2L′) are redox active as indicated by cyclovoltammetric measurements and confirmed by preparative methods: Reversible oxidation to the corresponding oxovanadium (V) cations is observed at ca. 0.35 V vs. SCE in CH2Cl2, and these cations are prepared in high yield by oxidation of the oxovanadium(IV) precursors with [(C5H5)2Fe]SbF6 (reversible by addition of cobaltocene). Irreversible reduction waves are observed for both complexes in the range -1 .9 to 2.1 V vs. SCE in CH2Cl2. Preparative reduction of LVO with Na/K alloy affords very unstable anionic oxovanadium(IV) complexes containing a deprotonated or reduced ligand, while with Li[B(C2H5)3H] in THF the Lewis acid/Lewis base adduct LVOxB(C2H3)3 is isolated. Spectroscopic data including ESR [vanadium(IV)] and 51V NMR [vanadium(V)] are given and discussed. The complexes LVO and [LVO]SbF6 have been characterized by single crystal Xray structure determinations.

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25

Tapas, Ghosh, and Ranabir Sur Kumar. "Oxovanadium(IV) complexes containing ONO donor hydrazone ligands derived from acetylacetone and acetylhydrazidelbenzoylhydrazide." Journal of Indian Chemical Society Vol. 83, Sep 2006 (2006): 888–90. https://doi.org/10.5281/zenodo.5829961.

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Department of Chemistry, R. K. Mission V. C. College, P.O. Rahara, Kolkata-700 118, India <em>E-mail </em>: ictg_64@yahoo.co.in <em>Manuscript received 4 October 2005, revised 4 May 2006, accepted 26 June 2006</em> Two oxovanadium(tv) complexes [VO(L<sup>I</sup>)(CH<sub>3</sub>OH)], 1 and [VO(L<sup>2</sup>)(CH<sub>3</sub>OH)], 2 were synthesized by the reaction of equimolar amount of VO(acac)l with acetylhydrazide (Ilah) and VO(acac)z with bcnzoylhydrazide (lib h) respectively in methanol [(L<sup>1</sup>)<sup>2-</sup> and (L<sup>2</sup>)<sup>2-</sup>stand for the dianions of the hydrazone ligands produced by the condensation reaction of one of the two coordinated acetylacetonate moieties in VO(acac)<sub>2</sub> with Hah and Hbh respectively]. The complexes display subnormal magnetic moment (μ<sub>eff </sub>= 0.84 and 1.04 B.M. respectively, for complexes 1 and 2) at room temperature indicating appreciable antirerromagnetic interaction due to overlapping of two 3d<sub>\(xy\)</sub> orbitals of two vanadium atoms of the neighboring molecules through the formation of bridge via one of the two enolic-O atoms.

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26

Ma, Xi Tong, Na Xing, Zhi Dan Yan, Xiao Xi Zhang, Qiong Wu, and Yong Heng Xing. "Peroxo- and oxovanadium(iv) complexes with tridentate N-heterocycle ligands: synthesis, structure, and catalytic performance." New Journal of Chemistry 39, no. 2 (2015): 1067–74. http://dx.doi.org/10.1039/c4nj01525h.

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R., N. Patel, Maurya K., P. Singha Y., et al. "Synthesis, spectral, DFT calculations and biological activity studies of vanadyl complexes with L-aspartic acid and imidazoles/1,10-phenanthroline as co-ligands." Journal of Indian Chemical Society Vol. 94, Apr 2017 (2017): 347–62. https://doi.org/10.5281/zenodo.5593949.

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Department of Chemistry, A. P. S. University, Rewa-486 003, Madhya Pradesh, India <em>E-mail</em> : rnp64@ymail.com Department of Chemistry, MGCGV, Chitrakoot, Satna-485 334, Madhya Pradesh, India <em>Manuscript received online 14 December 2016, accepted 15 December 2016</em> Five vanadium(IV) complexes [VO(Aspa)(L)], where Aspa = L-aspartic acid, L = imidazole, 2-methylimidazole, 2-ethylimidazole, 2-methylbenzimidazole and 1,10-phenanthroline, have been synthesized and characterized by microanalysis, FTIR, UV-Visible, ESR spectroscopy and cyclic voltammetry. The geometrical parameters of these complexes were performed by DFT and TD-DFT methods. The theoretical calculations confirm that the vanadium(IV) center exhibited square pyramidal geometry in 1-4 and distorted octahedral geometry in 5. The paramagnetic resonance g-factor and the magnetic susceptibilities (magnetic moments) of vanadyl complexes are discussed. The complexes were also tested for their in vitro antidiabetic activity (α-glucosidase inhibition activity). The complexes exhibited moderate antidiabetic properties.

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Francik, Renata, Jadwiga Kryczyk-Kozioł, Mirosław Krośniak, et al. "The Influence of Organic Vanadium Complexes on an Antioxidant Profile in Adipose Tissue in Wistar Rats." Materials 15, no. 5 (2022): 1952. http://dx.doi.org/10.3390/ma15051952.

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One of the aspects of biological activity of vanadium is its influence on carbohydrate metabolism. For more than 30 years, various vanadium complexes have been tested as antidiabetic agents. This study researched organic vanadium complexes with bipyridinium ligands and their influences on metabolic rate, as well as on the antioxidant activity of adipose tissue. The effects of sodium (2,2′-bipyridine) oxidobisperoxovanadate (V) octahydrate (known as the V complex), bis(2,2′-bipyridine) oxidovanadium (IV) sulfate dehydrate (known as the B complex), and bis(4.4′-dimethyl-2,2′-bipyridine) oxidovanadium (IV) sulfate dihydrate (labelled as the BM complex) were assessed. Solutions of the tested complexes were introduced intraperitoneally with a probe to animals fed with either a control diet or a high-fat diet. The BM complex had a significant influence on the increase in ferric reducing antioxidant power, as well as on the concentration of glutathione in the adipose tissue of rats fed with a high-fat diet. The V complex increased the concentration of glutathione in the adipose tissue of rats fed with control fodder, as well as significantly reduced the relative change in rat weight for the high-fat diet. Furthermore, the presence of each tested vanadium complex had an impact of statistically significant increase in basal metabolic rate, regardless of applied diet. Further research on these organic vanadium complexes is necessary to understand the mechanisms responsible for their ability to affect adipose tissue.

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Kowalski, Szymon, Aleksandra Tesmar, Artur Sikorski, and Iwona Inkielewicz-Stępniak. "Oxidovanadium(IV) Complex Disrupts Mitochondrial Membrane Potential and Induces Apoptosis in Pancreatic Cancer Cells." Anti-Cancer Agents in Medicinal Chemistry 21, no. 1 (2020): 71–83. http://dx.doi.org/10.2174/1871520620666200624145217.

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Background: At the present time, there is a growing interest in metal-based anticancer agents. Metal complexes exhibit many valuable clinical properties, however, due to toxicity, only a few clinically useful complexes have been discovered. It has been demonstrated that synthetic vanadium complexes exhibit many biological activities, including anti-cancer properties, however, cellular and molecular mechanisms still are not fully understood. Objective: This investigation examined the potential effects of three newly synthesized oxidovanadium(IV) complexes with 2-amino-3-hydroxypyridine against pancreatic cancer cells. Methods: We measured cytotoxicity by using 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide, antiproliferative activity by bromodeoxyuridine assay and necrosis as well as late apoptosis by lactate dehydrogenase assay. Reactive oxygen species generation, apoptosis and mitochondrial membrane potential were determined by a flow cytometry technique. Cell morphology was evaluated by using a transmission electron microscope. Results: The results showed that oxidovanadium(IV) complexes were cytotoxic on pancreatic cancer cells (PANC-1 and MIA PaCa2) over the concentration range of 12.5-200μM, following 48h incubation. Additionally, the cellular mechanism of cytotoxic activity of [2-NH2-3-OH(py)H]4[V2O2(pmida)2]·6H2O (V3) complex was dependent on ROS generation, induction apoptosis with simultaneous disruption of mitochondrial membrane potential. Conclusion: We have proven that oxidovanadium (IV) complexes show therapeutic potential in pancreatic cancer therapy. The results of our research will help to understand the cellular mechanisms of the cytotoxic activity of the vanadium complexes and will allow a more effective design structure of new vanadium-based compounds in the future.

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Preuss, Fritz, Martina Steidel, and Reiner Exner. "Tris(tert-butoxo)silylthiolato-Komplexe des Vanadiums(V, IV, III) / Tris(tert-butoxo)silylthiolato Complexes of Vanadium(V, IV, III)." Zeitschrift für Naturforschung B 45, no. 12 (1990): 1618–24. http://dx.doi.org/10.1515/znb-1990-1204.

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The complexes ′C4H9N = V(O′C4H9)3-n[SSi(O′C4H9)3]n, O = V(O′C4H9)3-n[SSi(O′C4H9)3]n, O=V[SSi(O′C4H9)3]2 (9) and VCl[SSi(O′C4H9)3]2 have been prepared by reaction of chlorovanadium compounds with LiSSi(O′C4H9)3. All complexes are characterized by NMR (1H, 51V) and ESR spectroscopy. 9 has been found by X-ray diffraction analysis to be a distorted trigonal bipyramidal complex with bidentate thiolate ligands.

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Kuliyev, Kerim A. "Spectroscopic Investiqation Complex Formation Of Vanadium Using 2,6-Dithiol-4-Methylphenol And HudrophobAmins." JOURNAL OF ADVANCES IN CHEMISTRY 11, no. 4 (2015): 3488–98. http://dx.doi.org/10.24297/jac.v11i4.2208.

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Mixed-ligand complexes of Vanadium (IV, V) with 2,6-dithiol-4-methylphenol (DTMP) and hydrofobamins(Am) have been studied by spectrophotometry. Extraction of mixed ligand complexes is maximal at pH 3.8-5.3. The optimal conditions for the formation and extraction of mixed-ligand compounds have been found and the ratios of components I the complexes have been determined. The Beer’s law was applicable in the range of 0.04-3.6mg/ml.The method is free from common interferences. A procedure has been developed for extraction – spectro-photometric determination vanadium in soils andin oil and oil-products.

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Kabanos, Themistoklis A., Alexandra M. Z. Slawin, David J. Williams, and J. Derek Woollins. "New non-oxo vanadium-(IV) and -(V) complexes." Journal of the Chemical Society, Dalton Transactions, no. 8 (1992): 1423. http://dx.doi.org/10.1039/dt9920001423.

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Fataftah, Majed S., Matthew D. Krzyaniak, Bess Vlaisavljevich, Michael R. Wasielewski, Joseph M. Zadrozny, and Danna E. Freedman. "Metal–ligand covalency enables room temperature molecular qubit candidates." Chemical Science 10, no. 27 (2019): 6707–14. http://dx.doi.org/10.1039/c9sc00074g.

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34

Buglyó, Péter, Nicola Culeddu, Tamás Kiss, Giovanni Micera, and Daniele Sanna. "Vanadium (IV) and vanadium (V) complexes of deferoxamine B in aqueous solution." Journal of Inorganic Biochemistry 60, no. 1 (1995): 45–59. http://dx.doi.org/10.1016/0162-0134(95)00001-5.

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35

Kamalasekaran, Kavitha. "Potentiometric Titration of Vanadium (V) with Iron (II) in the Presence of NTA and DTPA Using Dry-Cell Graphite Electrode." Revista de Chimie 72, no. 3 (2021): 144–58. http://dx.doi.org/10.37358/rc.21.3.8445.

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A sensitive potentiometric titration for vanadium (V) based effect of ligands such as nitrilotriacetic acid (NTA) and diethylenetriaminepenta-acetic acid (DTPA) are reviewed. The potential iron system decreased the presence of NTA and DTPA. In this case, iron (III) increased with respect to the vanadium (IV) volume. The production of iron (III)-ligand complex has increased. This result suggested that the formation of V(V)-NTA and V(V)-DTPA complexes were less favoured than that of V(IV)-NTA and V(IV)-DTPA complexes. The calculated correlation coefficients (r) conveyed the effectiveness of the graphite electrode as the indicator electrode for the potentiometric titrations. On comparing the potential jump values, the extent of potential caused by DTPA was found to be more than that of NTA. The utilization of graphite electrode has facilitated the potentiometric titration by significantly causing larger potential jump. This method was precise and accurate as no interference of foreign ions was observed. Hence, the approach could be applied to the vanadium (V) of any samples.

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Parker, B. F., S. Hohloch, J. R. Pankhurst, et al. "Interactions of vanadium(iv) with amidoxime ligands: redox reactivity." Dalton Transactions 47, no. 16 (2018): 5695–702. http://dx.doi.org/10.1039/c7dt04069e.

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Vanadium is the main competitor for uranium extraction from seawater, and V(iv) comprises a minor but important portion of this. V(iv) undergoes redox reactions with oximes and amidoxime ligands under seawater-relevant conditions, leading to V(v) complexes and loss of oxime functional groups.

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Maurya, Mannar R., Bithika Sarkar, Fernando Avecilla, and Isabel Correia. "Vanadium(iv and v) complexes of pyrazolone based ligands: Synthesis, structural characterization and catalytic applications." Dalton Transactions 45, no. 43 (2016): 17343–64. http://dx.doi.org/10.1039/c6dt03425j.

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Four different types of novel vanadium(iv and v) complexes have been isolated and characterized. Complexes [V<sup>V</sup>O(OMe)(L)] are used as catalysts in the oxidative aromatization of Hantzsch 1,4-dihydropyridine derivatives and in the oxidation of tetralin.

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Jackson, Cassidy E., Chun-Yi Lin, Spencer H. Johnson, Johan van Tol, and Joseph M. Zadrozny. "Nuclear-spin-pattern control of electron-spin dynamics in a series of V(iv) complexes." Chemical Science 10, no. 36 (2019): 8447–54. http://dx.doi.org/10.1039/c9sc02899d.

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Jitendra, Kumar Pandey, Kumar Sengupta Soumitra, and Prakash Pandey Om. "Synthesis and spectroscopic studies on oxovanadium(IV) tetraaza macrocyclic complexes derived from substituted B-diketones and 2,6-diaminopyridine." Journal of Indian Chemical Society Vol. 83, Nov 2006 (2006): 1073–76. https://doi.org/10.5281/zenodo.5832245.

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Chemistry Department, DDU Gorakhpur University. Gorakhpur-273 009. Uttar Pradesh, India <em>E-mail :</em> sengupta2002@yahoo.co.in <em>Manuscript received 6 June 2006, accepted 11 August 2006</em> The in situ reactions of 1-phenyl-3-(4-chlorophenyl/4-nitrophenyl/4-methoxyphenyl)-diketone with 2,6- diaminopyridine in the presence of oxovanadium(IV) sulphate yield macrocyclic complexes of type [VO(mac)]SO<sub>4</sub>. Attempts to synthesize the corresponding metal free macrocyclic ligands did not prove successful. The magnetic moments of the complexes lie in the ·range 1. 70-1.75 μ<sub>B</sub>. suitable for complexes with one unpaired electron. The electronic spectra exhibit three bands. The infrared spectra indicate that the ligands coordinate through four azomethine nitrogen atoms. The nuid solution EPR spectra show an eight line pattern typical for a mononuclear VO<sup>IV</sup> complexes. The spectral studies support square-pyramidal geometry for the vanadium(IV) complexes.

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Yadava, A. K., H. S. Yadav, Sanjay Singh, U. S. Yadav, and D. P. Rao. "Synthesis and Characterization of Some Novel Schiff Base Complexes of Oxovanadium(IV) Cation." Journal of Chemistry 2013 (2013): 1–5. http://dx.doi.org/10.1155/2013/689518.

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A series of oxovanadium(IV) complexes of the type [VO(mac)]SO4(where mac = tetraazamacrocyclic ligands derived from condensation of 4,4,4-trifluro-1-(2-furyl)-1,3-butanedione or 4,4,4-trifluro-1-(2-thenyl)-1,3-butanedione withp-phenylenediamine and their reaction withβ-diketones) have been prepared using oxometal ion of vanadium as kinetic template. These complexes have been ascertained by electrical conductance, magnetic moment, elemental analyses, infrared, e.s.r. and electronic spectral data. All the oxovanadium(IV) complexes are five-coordinate ones.

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Das, Uttam, Poulami Pattanayak, Manas Kumar Santra, and Surajit Chattopadhyay. "Synthesis of New Oxido-Vanadium Complexes: Catalytic Properties and Cytotoxicity." Journal of Chemical Research 42, no. 1 (2018): 57–62. http://dx.doi.org/10.3184/174751918x15168821806597.

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Reaction of 2,3-dihydroxy benzaldehyde with 2-({2-amino phenyl}diazenyl)phenol afforded the ligand 3-(2-(2-hydroxyphenyl)diazenyl)-4-alkylphenyliminomethyl)benzene-1,2-diol. Reaction of H2L with VOSO4. 5H2O gave the oxido-vanadium(IV) complexes [(L)VO], which exhibited a quasi-reversible oxidative cyclic voltammetric response in a V(IV)/V(V) oxidative process. The complexes act as catalysts in the oxidation of organic thioethers and bromination of phenol. Their cytotoxic properties were examined for three cancer cell lines.

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Cruz-Navarro, Jesús Antonio, Luis Humberto Delgado-Rangel, Ricardo Malpica-Calderón, et al. "Advances in the Exploration of Coordination Complexes of Vanadium in the Realm of Alzheimer’s Disease: A Mini Review." Molecules 30, no. 12 (2025): 2547. https://doi.org/10.3390/molecules30122547.

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Alzheimer’s disease (AD) is a progressive neurodegenerative disorder characterized by cognitive decline, memory loss and limited therapeutic options. Metal-based drugs have emerged as promising alternatives in the search for effective treatments, and vanadium coordination complexes have shown significant potential due to their neuroprotective and anti-aggregant properties. This review explores the advances in the development of vanadium-based metallodrugs for AD, focusing on their ability to modulate amyloid-beta (Aβ) aggregation, oxidative stress, and neuroinflammation. Recent in vitro and in vivo studies highlight the efficacy of oxovanadium (IV) and peroxovanadium (V) complexes in inhibiting Aβ fibril formation and reducing neuronal toxicity. Additionally, the interaction of vanadium complexes with key biological targets, such as peroxisome proliferator-activated receptor gamma (PPARγ) and protein-tyrosine phosphatase 1B (PTP1B), suggests a multifaceted therapeutic approach. While these findings underscore the potential of vanadium compounds as innovative treatments for AD, further research is needed to optimize their bioavailability, selectivity, and safety for clinical applications.

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Lenhardt, Jeremy M., Bharat Baruah, Debbie C. Crans, and Michael D. Johnson. "Electron transfer in non-oxovanadium(IV) and (V) complexes: Kinetic studies of an amavadin model." Pure and Applied Chemistry 81, no. 7 (2009): 1241–49. http://dx.doi.org/10.1351/pac-con-08-08-23.

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Electron-transfer reactions of the eight-coordinate vanadium complex, bis-(N-hydroxyiminodiacetate)vanadium(IV) [V(HIDA)2]2–, a synthetic analog of amavadin with ascorbic acid and hexachloroiridate(IV), have been studied. The self-exchange rate constant for this analog has been calculated from oxidation and reduction cross-reactions using Marcus theory and directly measured using 51V NMR paramagnetic line-broadening techniques. The average self-exchange rate constant for the bis-HIDA vanadium(IV/V) couple equals 1.5 × 105 M–1 s–1. The observed rate enhancements are proposed to be due to the small structural differences between the oxidized and reduced forms of the HIDA complex and inner-sphere reorganizational energies. The electron-transfer reaction of this synthetic analog is experimentally indistinguishable from amavadin itself, although significant differences exist in the reduction potential of these compounds. This suggests that ligand modification effects the thermodynamic driving force and not the self-exchange process.

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Maurya, Mannar R., Bithika Sarkar, Amit Kumar, Nádia Ribeiro, Aistè Miliute, and João Costa Pessoa. "New thiosemicarbazide and dithiocarbazate based oxidovanadium(iv) and dioxidovanadium(v) complexes. Reactivity and catalytic potential." New Journal of Chemistry 43, no. 45 (2019): 17620–35. http://dx.doi.org/10.1039/c9nj01486a.

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Sakurai, Hiromu, Satoko Funakoshi, and Yusuke Adachi. "New developments of insulinomimetic dinuclear vanadyl(IV)-tartrate complexes." Pure and Applied Chemistry 77, no. 9 (2005): 1629–40. http://dx.doi.org/10.1351/pac200577091629.

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The number of patients suffering from diabetes mellitus (DM) is increasing year by year throughout the world. In 2003, the world population was 6.3 billion, and the number of patients with DM in the adult population (20-79 years old) was 0.194 billion, which corresponded to 5.1 % of all disease incidence in that age range. In 2005, it is forecasted that the world population will increase to 8.0 billion and the ratio of DM to total disease incidence will increase to 6.3 %, with a disproportionate number of cases in Southeast Asia, the West Pacific, Central Asia, and North, Central, and South America. To treat Type 1 and Type 2 DM clinically, insulin preparations and synthetic drugs, respectively, have been used. However, these treatments are associated with some problems, such as several times of daily insulin injections following blood glucose monitoring and side effects in the case of the synthetic drugs. Consequently, a new class of therapeutic compounds is anticipated. After many trials, vanadium-containing complexes have been proposed to improve and treat both types of DM by in vivo experiments. We present an overview of insulinomimetic and antidiabetic vanadyl (+4 vanadium, V) complexes, and propose new candidates for dinuclear vanadyl complexes with naturally occurring ligands. The current state of research on the dinuclear vanadyl(IV)-tartrate complexes is described in regard to the physicochemical characteristics, in vitro insulinomimetic and in vivo blood-glucose-lowering effects of the prepared complexes.

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Mohanta, Sasankasekhar, Kausik K. Nanda, Soma Ghosh, Monika Mukherjee, Madeleine Helliwell, and Kamalaksha Nag. "Macrocyclic dimeric vanadium(IV) and heterodinuclear vanadium(IV)–nickel(II) complexes. Structure, magnetic, electronic and redox properties." J. Chem. Soc., Dalton Trans., no. 22 (1996): 4233–38. http://dx.doi.org/10.1039/dt9960004233.

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Nicholls, David, Anita C. Thomson, and A. Jonathan Varney. "Acetyl and benzoyl cyanide complexes with titanium(IV) and vanadium(IV) chlorides." Inorganica Chimica Acta 115, no. 1 (1986): L13—L14. http://dx.doi.org/10.1016/s0020-1693(00)87685-9.

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Dessì, A. "Vanadium(IV) and oxovanadium(IV) complexes of hydroxamic acids and related ligands." Journal of Inorganic Biochemistry 48, no. 4 (1992): 279–87. http://dx.doi.org/10.1016/0162-0134(92)84054-q.

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Wen, Dou, Jian Zhou, and Hua-Hong Zou. "A series of new oxo-vanadium(IV) complexes with octahedral coordinated vanadium centers." Journal of Coordination Chemistry 72, no. 5-7 (2019): 1064–74. http://dx.doi.org/10.1080/00958972.2019.1596264.

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Ashiq, Uzma, Rifat Jamal, Mohammad Mesaik, Muhammad Mahroof-Tahir, Saba Shahid, and Khalid Khan. "Synthesis, Immunomodulation and Cytotoxic Effects of Vanadium (IV) Complexes." Medicinal Chemistry 10, no. 3 (2014): 287–99. http://dx.doi.org/10.2174/15734064113099990033.

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