51
|
|
52
|
Mimicking peroxidase activity by a polymer-supported oxidovanadium(IV) Schiff base complex derived from salicylaldehyde and 1,3-diamino-2-hydroxypropane. J Inorg Biochem 2015; 147:181-92. [PMID: 25747150 DOI: 10.1016/j.jinorgbio.2015.01.012] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2014] [Revised: 01/17/2015] [Accepted: 01/18/2015] [Indexed: 11/23/2022]
Abstract
The polymer-supported oxidovanadium(IV) complex PS-[V(IV)O(sal-dahp)] (2) (PS=chloromethylated polystyrene crosslinked with 5% divinylbenzene, and H3sal-dahp=dibasic pentadentate ligand derived from salicylaldehyde and 1,3-diamino-2-hydroxypropane) was prepared from the corresponding monomeric oxidovanadium(IV) complex [V(IV)O(Hsal-dahp)(DMSO)] (1), characterized and successfully used as catalyst for the peroxidase-like oxidation of pyrogallol. The oxidation of pyrogallol to purpurogallin with PS-[V(IV)O(sal-dahp)] (2) was achieved under mild conditions at pH7 buffered solution. Plausible intermediate species formed during peroxidase mimicking experiments are proposed, by studying the model complex [V(IV)O(Hsal-dahp)(DMSO)] (1) by UV-visible and (51)V NMR spectroscopies. The high peroxidase mimicking ability of polymer-supported complex 2, its stability in a wide pH range, the easy separation from the reaction media, and the reusability without considerable decrease in activity, suggest that this heterogeneous catalyst has high potential for application in sustainable industrial catalysis.
Collapse
|
53
|
Abstract
Vanadium is special in at least two respects: on the one hand, the tetrahedral anion vanadate(v) is similar to the phosphate anion; vanadate can thus interact with various physiological substrates that are otherwise functionalized by phosphate. On the other hand, the transition metal vanadium can easily expand its sphere beyond tetrahedral coordination, and switch between the oxidation states +v, +iv and +iii in a physiological environment. The similarity between vanadate and phosphate may account for the antidiabetic potential of vanadium compounds with carrier ligands such as maltolate and picolinate, and also for vanadium's mediation in cardiovascular and neuronal defects. Other potential medicinal applications of more complex vanadium coordination compounds, for example in the treatment of parasitic tropical diseases, may also be rooted in the specific properties of the ligand sphere. The ease of the change in the oxidation state of vanadium is employed by prokarya (bacteria and cyanobacteria) as well as by eukarya (algae and fungi) in respiratory and enzymatic functions. Macroalgae (seaweeds), fungi, lichens and Streptomyces bacteria have available haloperoxidases, and hence enzymes that enable the 2-electron oxidation of halide X(-) with peroxide, catalyzed by a Lewis-acidic V(V) center. The X(+) species thus formed can be employed to oxidatively halogenate organic substrates, a fact with implications also for the chemical processes in the atmosphere. Vanadium-dependent nitrogenases in bacteria (Azotobacter) and cyanobacteria (Anabaena) convert N2 + H(+) to NH4(+) + H2, but are also receptive for alternative substrates such as CO and C2H2. Among the enigmas to be solved with respect to the utilization of vanadium in nature is the accumulation of V(III) by some sea squirts and fan worms, as well as the purport of the nonoxido V(IV) compound amavadin in the fly agaric.
Collapse
Affiliation(s)
- Dieter Rehder
- Chemistry Department, University of Hamburg, 20146 Hamburg, Germany.
| |
Collapse
|
54
|
Patra D, Biswas N, Kumari B, Das P, Sepay N, Chatterjee S, Drew MGB, Ghosh T. A family of mixed-ligand oxidovanadium(v) complexes with aroylhydrazone ligands: a combined experimental and computational study on the electronic effects of para substituents of hydrazone ligands on the electronic properties, DNA binding and nuclease activities. RSC Adv 2015. [DOI: 10.1039/c5ra17844d] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023] Open
Abstract
Substituents at 5-position in the acetophenone ring of the hydrazone ligands in a family of mixed-ligand oxidovanadium(v) complexes show marked influence on the electronic properties, DNA binding ability and nuclease activity.
Collapse
Affiliation(s)
- Debashis Patra
- Post Graduate Department of Chemistry
- Ramakrishna Mission Vivekananda Centenary College
- Kolkata-700118
- India
| | - Nirmalendu Biswas
- Post Graduate Department of Chemistry
- Ramakrishna Mission Vivekananda Centenary College
- Kolkata-700118
- India
| | - Bhavini Kumari
- Department of Chemistry
- Indian Institute of Technology Patna
- India
| | - Prolay Das
- Department of Chemistry
- Indian Institute of Technology Patna
- India
| | - Nayim Sepay
- Department of Chemistry
- Jadavpur University
- Kolkata-700032
- India
| | - Shamba Chatterjee
- Department of Organic Chemistry
- Indian Association for the Cultivation of Science
- Kolkata-700032
- India
| | | | - Tapas Ghosh
- Post Graduate Department of Chemistry
- Ramakrishna Mission Vivekananda Centenary College
- Kolkata-700118
- India
| |
Collapse
|
55
|
Dash SP, Panda AK, Pasayat S, Dinda R, Biswas A, Tiekink ERT, Mukhopadhyay S, Bhutia SK, Kaminsky W, Sinn E. Oxidovanadium(v) complexes of aroylhydrazones incorporating heterocycles: synthesis, characterization and study of DNA binding, photo-induced DNA cleavage and cytotoxic activities. RSC Adv 2015. [DOI: 10.1039/c4ra14369h] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023] Open
Abstract
The interaction of four neutral oxidovanadium(v) complexes with DNA and their cytotoxic activities have been reported.
Collapse
Affiliation(s)
- Subhashree P. Dash
- Department of Chemistry
- National Institute of Technology
- Rourkela 769008
- India
| | - Alok K. Panda
- School of Basic Sciences
- Indian Institute of Technology Bhubaneswar
- Bhubaneswar 751 013
- India
| | - Sagarika Pasayat
- Department of Chemistry
- National Institute of Technology
- Rourkela 769008
- India
| | - Rupam Dinda
- Department of Chemistry
- National Institute of Technology
- Rourkela 769008
- India
| | - Ashis Biswas
- School of Basic Sciences
- Indian Institute of Technology Bhubaneswar
- Bhubaneswar 751 013
- India
| | | | | | - Sujit K. Bhutia
- Department of Life Science
- National Institute of Technology
- Rourkela 769008
- India
| | | | - Ekkehard Sinn
- Department of Chemistry
- Western Michigan University
- Kalamazoo
- USA
| |
Collapse
|
56
|
Ma X, Zhang J, Tang N, Wu J. A thermo-responsive supramolecular organogel: dual luminescence properties and luminescence conversion induced by Cd2+. Dalton Trans 2014; 43:17236-9. [DOI: 10.1039/c4dt02502d] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
|
57
|
Maurya MR, Kumar N, Avecilla F. Polymer and non-polymer-grafted dioxidomolybdenum(VI) complexes having ONO donor ligand and their catalytic activities for the oxidative bromination of organic substrates. ACTA ACUST UNITED AC 2014. [DOI: 10.1016/j.molcata.2014.05.002] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
58
|
Maurya MR, Chaudhary N, Kumar A, Avecilla F, Costa Pessoa J. Polystyrene bound dioxidovanadium(V) complexes of 2-acetylpyridine derived ligands for catalytic oxidations. Inorganica Chim Acta 2014. [DOI: 10.1016/j.ica.2013.11.021] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
|
59
|
|
60
|
Machado I, Fernández M, Becco L, Garat B, Brissos R, Zabarska N, Gamez P, Marques F, Correia I, Costa Pessoa J, Gambino D. New metal complexes of NNO tridentate ligands: Effect of metal center and co-ligand on biological activity. Inorganica Chim Acta 2014. [DOI: 10.1016/j.ica.2013.10.022] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
|
61
|
Sutradhar M, Pombeiro AJ. Coordination chemistry of non-oxido, oxido and dioxidovanadium(IV/V) complexes with azine fragment ligands. Coord Chem Rev 2014. [DOI: 10.1016/j.ccr.2014.01.007] [Citation(s) in RCA: 62] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
|
62
|
|
63
|
Dash SP, Panda AK, Pasayat S, Dinda R, Biswas A, Tiekink ERT, Patil YP, Nethaji M, Kaminsky W, Mukhopadhyay S, Bhutia SK. Syntheses and structural investigation of some alkali metal ion-mediated LVVO2− (L2− = tridentate ONO ligands) species: DNA binding, photo-induced DNA cleavage and cytotoxic activities. Dalton Trans 2014; 43:10139-56. [DOI: 10.1039/c4dt00883a] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
|
64
|
Fernández M, Becco L, Correia I, Benítez J, Piro OE, Echeverria GA, Medeiros A, Comini M, Lavaggi ML, González M, Cerecetto H, Moreno V, Pessoa JC, Garat B, Gambino D. Oxidovanadium(IV) and dioxidovanadium(V) complexes of tridentate salicylaldehyde semicarbazones: Searching for prospective antitrypanosomal agents. J Inorg Biochem 2013; 127:150-60. [DOI: 10.1016/j.jinorgbio.2013.02.010] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2012] [Revised: 02/20/2013] [Accepted: 02/20/2013] [Indexed: 12/29/2022]
|
65
|
Hosseini-Monfared H, Bikas R, Mahboubi-Anarjan P, Weng Ng S, Tiekink ERT. The First Neutral Dinuclear Vanadium Complex Comprising VO and VO2Cores: Synthesis, Structure, Electrochemical Properties, and Catalytic Activity. Z Anorg Allg Chem 2013. [DOI: 10.1002/zaac.201300245] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
|
66
|
Justino GC, Garribba E, Pessoa JC. Binding of VIVO2+ to the Fe binding sites of human serum transferrin. A theoretical study. J Biol Inorg Chem 2013; 18:803-13. [DOI: 10.1007/s00775-013-1029-x] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2013] [Accepted: 08/03/2013] [Indexed: 10/26/2022]
|
67
|
Gupta S, Kirillova MV, Guedes da Silva MFC, Pombeiro AJL, Kirillov AM. Alkali Metal Directed Assembly of Heterometallic Vv/M (M = Na, K, Cs) Coordination Polymers: Structures, Topological Analysis, and Oxidation Catalytic Properties. Inorg Chem 2013; 52:8601-11. [DOI: 10.1021/ic400743h] [Citation(s) in RCA: 68] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Affiliation(s)
- Samik Gupta
- Centro de Química Estrutural, Complexo
I, Instituto Superior Técnico, Technical University of Lisbon, Av. Rovisco Pais, 1049-001, Lisbon, Portugal
| | - Marina V. Kirillova
- Centro de Química Estrutural, Complexo
I, Instituto Superior Técnico, Technical University of Lisbon, Av. Rovisco Pais, 1049-001, Lisbon, Portugal
| | - M. Fátima C. Guedes da Silva
- Centro de Química Estrutural, Complexo
I, Instituto Superior Técnico, Technical University of Lisbon, Av. Rovisco Pais, 1049-001, Lisbon, Portugal
- Universidade Lusófona de Humanidades e Tecnologias, ULHT, Lisbon, Av. do Campo
Grande, 376, 1749-024, Lisbon, Portugal
| | - Armando J. L. Pombeiro
- Centro de Química Estrutural, Complexo
I, Instituto Superior Técnico, Technical University of Lisbon, Av. Rovisco Pais, 1049-001, Lisbon, Portugal
| | - Alexander M. Kirillov
- Centro de Química Estrutural, Complexo
I, Instituto Superior Técnico, Technical University of Lisbon, Av. Rovisco Pais, 1049-001, Lisbon, Portugal
| |
Collapse
|
68
|
New oxidovanadium(IV) N -acylhydrazone complexes: Promising antileishmanial and antitrypanosomal agents. Eur J Med Chem 2013; 62:20-7. [DOI: 10.1016/j.ejmech.2012.12.036] [Citation(s) in RCA: 55] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2012] [Revised: 11/07/2012] [Accepted: 12/19/2012] [Indexed: 12/20/2022]
|
69
|
Maurya MR, Bisht M, Chaudhary N, Avecilla F, Kumar U, Hsu HF. Synthesis, structural characterization, encapsulation in zeolite Y and catalytic activity of an oxidovanadium(V) complex with a tribasic pentadentate ligand. Polyhedron 2013. [DOI: 10.1016/j.poly.2013.02.036] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
|
70
|
Boruah JJ, Das SP, Borah R, Gogoi SR, Islam NS. Polymer-anchored peroxo compounds of molybdenum and tungsten as efficient and versatile catalysts for mild oxidative bromination. Polyhedron 2013. [DOI: 10.1016/j.poly.2012.09.036] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
|
71
|
Abstract
In the early treatment of diabetes with vanadium, inorganic vanadium compounds have been the focus of attention; organic vanadium compounds are nowadays increasingly attracting attention. A key compound is bis(maltolato)oxidovanadium, which became introduced into clinical tests Phase IIa. Organic ligands help modulate the bioavailability, transport and targeting mechanism of a vanadium compound. Commonly, however, the active onsite species is vanadyl (VO(2+)) or vanadate (H(2)VO(4) (-)), generated by biospeciation. The mode of operation can be ascribed to interaction of vanadate with phosphatases and kinases, and to modulation of the level of reactive oxygen species interfering with phosphatases and/or DNA. This operating mode has also been inferred for most cancerostatic vanadium compounds, although some, for example vanadocenes, may directly intercalate with DNA. Novel medicinal potentiality of vanadium compounds is geared towards endemic diseases in tropical countries, in particular leishmaniasis, Chagas' disease and amoebiasis, and viral infections such as Dengue fever, SARS and HIV.
Collapse
|
72
|
Synthesis, structure and catalytic activity of an oxo-bridged dinuclear oxovanadium complex of an isonicotinohydrazide ligand. TRANSIT METAL CHEM 2013. [DOI: 10.1007/s11243-012-9687-z] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
|
73
|
Mehtab S, Gonçalves G, Roy S, Tomaz AI, Santos-Silva T, Santos MFA, Romão MJ, Jakusch T, Kiss T, Pessoa JC. Interaction of vanadium(IV) with human serum apo-transferrin. J Inorg Biochem 2013; 121:187-95. [PMID: 23411030 DOI: 10.1016/j.jinorgbio.2012.12.020] [Citation(s) in RCA: 61] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2012] [Revised: 12/27/2012] [Accepted: 12/28/2012] [Indexed: 10/27/2022]
Abstract
The interaction of V(IV)O-salts as well as of a few V(IV)O(carrier)n complexes with human serum transferrin (hTF) is studied focusing on the determination of the nature and stoichiometry of the binding of V(IV)O(2+) to hTF, as well as whether the conformation of hTF upon binding to V(IV)O(2+) or to its complexes is changed. Circular dichroism (CD) spectra measured for solutions containing V(IV)O(2+) and apo-hTF, and V(IV)O-maltol and apo-hTF, clearly indicate that hTF-V(IV)O-maltol ternary species form with a V(IV)O:maltol stoichiometry of 1:1. For V(IV)O salts and several V(IV)O(carrier)n complexes (carrier ligand=maltolato, dhp, picolinato and dipicolinato) (Hdhp=1,2-dimethyl-3-hydroxy-4-pyridinone) the maximum number of V(IV)O(2+) bound per mole of hTF is determined to be ~2 or lower in all cases. The binding of V(IV)O to apo-hTF most certainly involves several amino acid residues of the Fe-binding site, and as concluded by urea gel electrophoresis experiments, the formation of (V(IV)O)2hTF species may occur with the closing of the hTF conformation as is the case in (Fe(III))2hTF, which is an essential feature for the transferrin receptor recognition.
Collapse
Affiliation(s)
- Sameena Mehtab
- Centro Química Estrutural, Instituto Superior Técnico, Universidade Técnica de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal
| | | | | | | | | | | | | | | | | | | |
Collapse
|
74
|
|
75
|
Abstract
Vanadium is the 21st most abundant element in the Earth's crust and the 2nd-to-most abundant transition metal in sea water. The element is ubiquitous also in freshwater and nutrients. The average body load of a human individual amounts to 1 mg. The omnipresence of vanadium hampers checks directed towards its essentiality. However, since vanadate can be considered a close blueprint of phosphate with respect to its built-up, vanadate likely takes over a regulatory function in metabolic processes depending on phosphate. At common concentrations, vanadium is non-toxic. The main source for potentially toxic effects caused by vanadium is exposure to high loads of vanadium oxides in the breathing air of vanadium processing industrial enterprises. Vanadium can enter the body via the lungs or, more commonly, the stomach. Most of the dietary vanadium is excreted. The amount of vanadium resorbed in the gastrointestinal tract is a function of its oxidation state (V(V) or V(IV)) and the coordination environment. Vanadium compounds that enter the blood stream are subjected to speciation. The predominant vanadium species in blood are vanadate and vanadyl bound to transferrin. From the blood stream, vanadium becomes distributed to the body tissues and bones. Bones act as storage pool for vanadate. The aqueous chemistry of vanadium(V) at concentration <10 μM is dominated by vanadate. At higher concentrations, oligovanadates come in, decavanadate in particular, which is thermodynamically stable in the pH range 2.3-6.3, and can further be stabilized at higher pH by interaction with proteins.The similarity between vanadate and phosphate accounts for the interplay between vanadate and phosphate-dependent enzymes: phosphatases can be inhibited, kinases activated. As far as medicinal applications of vanadium compounds are concerned, vanadium's mode of action appears to be related to the phosphate-vanadate antagonism, to the direct interaction of vanadium compounds or fragments thereof with DNA, and to vanadium's contribution to a balanced tissue level of reactive oxygen species. So far vanadium compounds have not yet found approval for medicinal applications. The antidiabetic (insulin-enhancing) effect, however, of a singular vanadium complex, bis(ethylmaltolato)oxidovanadium(IV) (BEOV), has revealed encouraging results in phase IIa clinical tests. In addition, in vitro studies with cell cultures and parasites, as well as in vivo studies with animals, have revealed a broad potential spectrum for the application of vanadium coordination compounds in the treatment of cardiac and neuronal disorders, malignant tumors, viral and bacterial infections (such as influenza, HIV, and tuberculosis), and tropical diseases caused by parasites, e.g., Chagas' disease, leishmaniasis, and amoebiasis.
Collapse
Affiliation(s)
- Astrid Sigel
- Dept. of Chemistry, Inorganic Chemistry, University of Basel, Basel, Basel Stadt Switzerland
| | - Helmut Sigel
- Department of Chemistry, Inorganic Chemistry, University of Basel, Basel, Switzerland
| | - Roland K.O. Sigel
- Institute of Inorganic Chemistry, University of Zürich, Zürich, Zürich Switzerland
| |
Collapse
|
76
|
Maurya MR, Haldar C, Kumar A, Kuznetsov ML, Avecilla F, Costa Pessoa J. Vanadium complexes having [VO]2+, [VO]3+ and [VO2]+ cores with hydrazones of 2,6-diformyl-4-methylphenol: synthesis, characterization, reactivity, and catalytic potential. Dalton Trans 2013; 42:11941-62. [DOI: 10.1039/c3dt50469g] [Citation(s) in RCA: 83] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
|
77
|
Fernández M, Varela J, Correia I, Birriel E, Castiglioni J, Moreno V, Costa Pessoa J, Cerecetto H, González M, Gambino D. A new series of heteroleptic oxidovanadium(iv) compounds with phenanthroline-derived co-ligands: selective Trypanosoma cruzi growth inhibitors. Dalton Trans 2013; 42:11900-11. [DOI: 10.1039/c3dt50512j] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
|
78
|
Vigato P, Peruzzo V, Tamburini S. Acyclic and cyclic compartmental ligands: Recent results and perspectives. Coord Chem Rev 2012. [DOI: 10.1016/j.ccr.2012.01.009] [Citation(s) in RCA: 167] [Impact Index Per Article: 13.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
|
79
|
Maurya MR, Haldar C, Khan AA, Azam A, Salahuddin A, Kumar A, Costa Pessoa J. Synthesis, Characterization, Catalytic and Antiamoebic Activity of Vanadium Complexes of Binucleating Bis(dibasic tridentate ONS donor) Ligand Systems. Eur J Inorg Chem 2012. [DOI: 10.1002/ejic.201200012] [Citation(s) in RCA: 58] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
|
80
|
El-Taras AA, EL-Mehasseb IM, Ramadan AEMM. Synthesis, characterization, magnetic, thermal and electrochemical studies of oxidovanadium (IV) picolyl hydrazones as functional catechol oxidase models. CR CHIM 2012. [DOI: 10.1016/j.crci.2011.11.009] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
|
81
|
Bhunia S, Saha D, Koner S. MCM-41-supported oxo-vanadium(IV) complex: a highly selective heterogeneous catalyst for the bromination of hydroxy aromatic compounds in water. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2011; 27:15322-15329. [PMID: 22026477 DOI: 10.1021/la202094p] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
An ecofriendly solid catalyst has been synthesized by anchoring vanadium(IV) into organically modified MCM-41. First, the surface of Si-MCM-41 was modified with 3-aminopropyl-triethoxysilane (3-APTES), the amine group of which upon condensation with ortho-hydroxy-acetophenone affords a N(2)O(2)-type Schiff base moiety in the mesoporous matrix. The Schiff base moieties were used to anchor oxo-vanadium(IV) ions. The prepared catalyst has been characterized by UV-vis, IR spectroscopy, small-angle X-ray diffraction (SAX), nitrogen sorption, and transmission electron microscopy (TEM) studies. It is observed that the mesostructure has not been destroyed in the multistep synthesis procedure, as evidenced by SAX and TEM measurements. The catalyst has shown unprecedented high conversion as well as para selectivity toward the bromination of hydroxy aromatic compounds using aqueous 30% H(2)O(2)/KBr in water. The reaction proceeds according to the stoichiometric ratio, and the monobrominated product was obtained as the major product using a stoichiometric amount of the bromine source. The immobilized complex does not leach or decompose during the catalytic reactions, showing practical advantages over the free metal complex.
Collapse
Affiliation(s)
- Susmita Bhunia
- Department of Chemistry, Jadavpur University, Kolkata 700 032, India
| | | | | |
Collapse
|
82
|
|
83
|
|
84
|
Abstract
The current status and likely future directions of complexes of V(V/IV), Cr(III), Mo(VI), W(VI), Zn(II), Cu(II), and Mn(III) as potential oral drugs against type 2 diabetes are reviewed. We propose a unified model of extra- and intracellular mechanisms of anti-diabetic efficacies of V(V/IV), Mo(VI), W(VI), and Cr(III), centred on high-oxidation-state oxido/peroxido species that inhibit protein tyrosine phosphatases (PTPs) involved in insulin signalling. The postulated oxidative mechanism of anti-diabetic activity of Cr(III) via carcinogenic Cr(VI/V) (which adds to safety concerns) is consistent with recent clinical trials on Cr(III) picolinate, where activity was apparent only in patients with poorly controlled diabetes (high oxidative stress), and the correlation between the anti-diabetic activities and ease of oxidation of Cr(III) supplements and their metabolites in vivo. Zn(II) and Cu(II) anti-diabetics act via different mechanisms and are unlikely to be used as specific anti-diabetics due to their diverse and unpredictable biological activities. Hence, future research directions are likely to centre on enhancing the bioavailability and selectivity of V(V/IV), Mo(VI), or W(VI) drugs. The strategy of potentiating circulating insulin with metal ions has distinct therapeutic advantages over interventions that stimulate the release of more insulin, or use insulin mimetics, because of many adverse side-effects of increased levels of insulin, including increased risks of cancer and cardiovascular diseases.
Collapse
Affiliation(s)
- Aviva Levina
- School of Chemistry, The University of Sydney, NSW, Australia
| | | |
Collapse
|
85
|
Synthesis, characterization and catalytic activities of vanadium complexes containing ONN donor ligand derived from 2-aminoethylpyridine. ACTA ACUST UNITED AC 2011. [DOI: 10.1016/j.molcata.2011.04.017] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
|
86
|
Maurya MR, Bisht M, Kumar A, Kuznetsov ML, Avecilla F, Pessoa JC. Synthesis, characterization, reactivity and catalytic activity of oxidovanadium(iv), oxidovanadium(v) and dioxidovanadium(v) complexes of benzimidazole modified ligands. Dalton Trans 2011; 40:6968-83. [DOI: 10.1039/c1dt10261c] [Citation(s) in RCA: 68] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
|
87
|
Benítez J, Becco L, Correia I, Leal SM, Guiset H, Pessoa JC, Lorenzo J, Tanco S, Escobar P, Moreno V, Garat B, Gambino D. Vanadium polypyridyl compounds as potential antiparasitic and antitumoral agents: new achievements. J Inorg Biochem 2010; 105:303-12. [PMID: 21194632 DOI: 10.1016/j.jinorgbio.2010.11.001] [Citation(s) in RCA: 103] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2010] [Revised: 10/30/2010] [Accepted: 11/02/2010] [Indexed: 11/26/2022]
Abstract
In the search for new therapeutic tools against diseases produced by kinetoplastid parasites five vanadyl complexes, [V(IV)O(L-2H)(phen)], including 1,10-phenanthroline (phen) and tridentate salicylaldehyde semicarbazone derivatives as ligands have been synthesized and characterized in the solid state and in solution by using different techniques. EPR suggested a distorted octahedral geometry with the tridentate semicarbazone occupying three equatorial positions and phen coordinated in an equatorial/axial mode. The compounds were evaluated in vitro on epimastigotes of Trypanosoma cruzi, causative agent of Chagas disease, Leishmania panamensis and Leishmania chagasi and on tumor cells. The complexes showed higher in vitro anti-trypanosomal activities than the reference drug Nifurtimox (IC(50) values in the range 1.6-3.8 μM) and increased activities in respect to the free semicarbazone ligands. In vitro activity on promastigote and amastigote forms of Leishmania showed interesting results. The compounds [VO(L1-2H)(phen)] and [VO(L3-2H)(phen)], where L1 = 2-hydroxybenzaldehyde semicarbazone and L3 = 2-hydroxy-3-methoxybenzaldehyde semicarbazone, resulted active (IC(50) 2.74 and 2.75 μM, respectively, on promastigotes of L. panamensis; IC(50) 19.52 and 20.75 μM, respectively, on intracellular amastigotes of L. panamensis) and showed low toxicity on THP-1 mammalian cells (IC(50) 188.55 and 88.13 μM, respectively). In addition, the complexes showed cytotoxicity on human promyelocytic leukemia HL-60 cells with IC(50) values of the same order of magnitude as cisplatin. The interaction of the complexes with DNA was demonstrated by different techniques, suggesting that this biomolecule could be a potential target either in the parasites or in tumor cells.
Collapse
Affiliation(s)
- Julio Benítez
- Facultad de Química, UDELAR, Gral. Flores 2124, 11800 Montevideo, Uruguay
| | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
88
|
Maurya MR, Arya A, Kumar A, Kuznetsov ML, Avecilla F, Costa Pessoa J. Polymer-Bound Oxidovanadium(IV) and Dioxidovanadium(V) Complexes As Catalysts for the Oxidative Desulfurization of Model Fuel Diesel. Inorg Chem 2010; 49:6586-600. [DOI: 10.1021/ic1004209] [Citation(s) in RCA: 96] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Mannar R. Maurya
- Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee 247 667, India
| | - Aarti Arya
- Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee 247 667, India
| | - Amit Kumar
- Centro Química Estrutural, Instituto Superior Técnico, TU Lisbon, Av Rovisco Pais, 1049-001 Lisboa, Portugal
| | - Maxim L. Kuznetsov
- Centro Química Estrutural, Instituto Superior Técnico, TU Lisbon, Av Rovisco Pais, 1049-001 Lisboa, Portugal
| | - Fernando Avecilla
- Departamento de Química Fundamental, Universidade da Coruña, Campus de A Zapateira, 15071 A Coruña, Spain
| | - João Costa Pessoa
- Centro Química Estrutural, Instituto Superior Técnico, TU Lisbon, Av Rovisco Pais, 1049-001 Lisboa, Portugal
| |
Collapse
|