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Vanadium(IV) Complexes with Methyl-Substituted 8-Hydroxyquinolines: Catalytic Potential in the Oxidation of Hydrocarbons and Alcohols with Peroxides and Biological Activity. Molecules 2021; 26:molecules26216364. [PMID: 34770772 PMCID: PMC8588223 DOI: 10.3390/molecules26216364] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2021] [Revised: 10/15/2021] [Accepted: 10/18/2021] [Indexed: 11/16/2022] Open
Abstract
Methyl-substituted 8-hydroxyquinolines (Hquin) were successfully used to synthetize five-coordinated oxovanadium(IV) complexes: [VO(2,6-(Me)2-quin)2] (1), [VO(2,5-(Me)2-quin)2] (2) and [VO(2-Me-quin)2] (3). Complexes 1-3 demonstrated high catalytic activity in the oxidation of hydrocarbons with H2O2 in acetonitrile at 50 °C, in the presence of 2-pyrazinecarboxylic acid (PCA) as a cocatalyst. The maximum yield of cyclohexane oxidation products attained was 48%, which is high in the case of the oxidation of saturated hydrocarbons. The reaction leads to the formation of a mixture of cyclohexyl hydroperoxide, cyclohexanol and cyclohexanone. When triphenylphosphine is added, cyclohexyl hydroperoxide is completely converted to cyclohexanol. Consideration of the regio- and bond-selectivity in the oxidation of n-heptane and methylcyclohexane, respectively, indicates that the oxidation proceeds with the participation of free hydroxyl radicals. The complexes show moderate activity in the oxidation of alcohols. Complexes 1 and 2 reduce the viability of colorectal (HCT116) and ovarian (A2780) carcinoma cell lines and of normal dermal fibroblasts without showing a specific selectivity for cancer cell lines. Complex 3 on the other hand, shows a higher cytotoxicity in a colorectal carcinoma cell line (HCT116), a lower cytotoxicity towards normal dermal fibroblasts and no effect in an ovarian carcinoma cell line (order of magnitude HCT116 > fibroblasts > A2780).
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Synthesis, characterization and DFT studies of novel –CH2– capped and non-capped salan complexes. Inorganica Chim Acta 2021. [DOI: 10.1016/j.ica.2021.120265] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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Machado PM, Allão Cassaro RA, de Assis VM, de P. Machado S, Horn A, Lachter ER. Synthesis, characterization and DFT studies of a new unsymmetrical dinuclear Vanadium(IV) complex with a bipodal N2O-donor ligand. J Mol Struct 2019. [DOI: 10.1016/j.molstruc.2019.04.098] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
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A Novel Zn II Complex Bearing Two Monodentate (4-Methoxyphenyl)[(1E, 2E)-3-phenylprop-2-en-1-ilidene] Schiff Bases: Crystal Structure and DFT Study. J CHEM-NY 2019. [DOI: 10.1155/2019/7876495] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
A novel ZnII complex bearing two monodentate (4-methoxyphenyl)[(1E, 2E)-3-phenylprop-2-en-1-ilidene] Schiff bases was synthesized and investigated both in the solid state by single-crystal X-ray diffraction, elemental analysis, and FTIR and in solution by 1H NMR spectroscopy. The complex crystallizes in the P21/c monoclinic space group. The asymmetric unit contains one ZnII ion coordinated to two Schiff base ligands and two chloride ions, in a distorted tetrahedral geometry. The title complex was also investigated by DFT, using the hybrid functional B3LYP with basis set 6-31G++, which reproduced the geometry and structural features of the complex in the crystal, and was used to assign the main bands in the FTIR spectrum. In solution, the complex maintains its integrity against decomposition to the parent reagents.
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Vlasiou M, Drouza C, Kabanos TA, Keramidas AD. Donor atom electrochemical contribution to redox potentials of square pyramidal vanadyl complexes. J Inorg Biochem 2015; 147:39-43. [PMID: 25660671 DOI: 10.1016/j.jinorgbio.2015.01.010] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2014] [Revised: 01/16/2015] [Accepted: 01/16/2015] [Indexed: 10/24/2022]
Abstract
A simple donor atom additivity relationship has been used to calculate the donor atom electrochemical contribution (DEC) of the Oac (acetylacetonate-enolic oxygen), OPh (phenolic oxygen), SPh (mercaptophenol sulfur), Nam (deprotonate amide nitrogen), Nim (imine nitrogen) and Npy (pyridine nitrogen) to the redox processes of the square pyramidal vanadyl complexes. The study focuses on the amidate vanadyl complexes because of (a) their biological interest and (b) the existence of data from plethora complexes studied in great details. The electrochemical contributions for the vanadyl oxidation and reduction processes increase following the same order, OPh~Oac(enolic)<SPh~Nam<Nim<Npy. These values predict the electrochemical potentials of square pyramidal vanadyl complexes with high accuracy. Octahedral complexes with the same equatorial environment show significant shift of the oxidation potentials to lower values. The DEC influence to the square pyramidal vanadyls' electrochemical potentials has been evaluated.
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Affiliation(s)
- Manolis Vlasiou
- Department of Chemistry, University of Cyprus, 1678 Nicosia, Cyprus
| | - Chryssoula Drouza
- Department of Agricultural Sciences, Biotechnology and Food Science, Cyprus University of Technology, Lemesos 3036, Cyprus.
| | - Themistoklis A Kabanos
- Department of Chemistry, Section of Inorganic and Analytical Chemistry, University of Ioannina, 45110 Ioannina, Greece.
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Prakash V, Srivastava K, Prasad J. Electrochemical and spectral investigation of various pyridinedicarboxylic acids and their complexes with oxovanadium(IV) in dimethyl sulfoxide. J Mol Liq 2014. [DOI: 10.1016/j.molliq.2014.06.020] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Galloni P, Coletti A, Floris B, Conte V. Electrochemical properties of VO salen complexes. Inorganica Chim Acta 2014. [DOI: 10.1016/j.ica.2013.12.019] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Barman S, Patil S, Desper J, Aikens CM, Levy CJ. Helical Oxidovanadium(IV) Salen-Type Complexes: Synthesis, Characterisation and Catalytic Behaviour. Eur J Inorg Chem 2013. [DOI: 10.1002/ejic.201300635] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Sarkar S, Mohanta S. Syntheses, crystal structures and supramolecular topologies of nickel(II)–s/p/d10/NH4+ complexes derived from a compartmental ligand. RSC Adv 2011. [DOI: 10.1039/c1ra00144b] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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Kilic A, Durgun M, Ulusoy M, Tas E. Conversion of CO2into Cyclic Carbonates in the Presence of Metal Complexes as Catalysts. JOURNAL OF CHEMICAL RESEARCH 2010. [DOI: 10.3184/030823410x12876680449167] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
The sterically hindered salicylaldimine ligands N,N‘-(1,5-diaminonaphthalene)-3,5-but2-salicylaldimine (L1), N,N‘-(2,7-diaminofluaren)-3,5-but2-salicylaldimine (L2) and N,N‘-(1,8-diaminonaphthaline)-3,5-but2-salicylaldimine (L3) have been synthesised by the condensation of 1,5-diaminonaphthalene, 2,7-diaminofluarene, and 1,8-diaminonaphthaline with 3,5-di-tert-butylsalicylaldehyde, respectively. Dinuclear M(II) complexes of L1and L2and mononuclear M(II) complexes of L3have been prepared using Cu(II), Ni(II), Co(II), and Mn(II) salts and characterised. The synthesised sterically-hindered, salen-type complexes were tested as catalysts for the formation of cyclic carbonates from CO2and liquid epoxides (propylene oxide, epichlorohydrine, 1,2-epoxybutane and styrene oxide), which served as both reactant and solvent. Ligand structure and the type of metal centre have a marked influence on the catalytic activity. Mn(II) complexes showed the highest catalytic activity.
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Affiliation(s)
- Ahmet Kilic
- Department of Chemistry, University of Harran, 63190 Sanliurfa, Turkey
| | - Mustafa Durgun
- Department of Chemistry, University of Harran, 63190 Sanliurfa, Turkey
| | - Mahmut Ulusoy
- Department of Chemistry, University of Harran, 63190 Sanliurfa, Turkey
| | - Esref Tas
- Department of Chemistry, University of Siirt, 56100 Siirt, Turkey
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El-Ansary AL, Abdel-Fattah HM, Abdel-Kader NS. Synthesis and characterization of tetradentate bis -Schiff base complexes of di- and tri-valent transition metals. J COORD CHEM 2010. [DOI: 10.1080/00958970801989910] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Affiliation(s)
- Aida L. El-Ansary
- a Faculty of Science, Department of Chemistry , Cairo University , Giza, Egypt
| | | | - Nora S. Abdel-Kader
- a Faculty of Science, Department of Chemistry , Cairo University , Giza, Egypt
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North M, Usanov DL, Young C. Lewis acid catalyzed asymmetric cyanohydrin synthesis. Chem Rev 2009; 108:5146-226. [PMID: 19067648 DOI: 10.1021/cr800255k] [Citation(s) in RCA: 286] [Impact Index Per Article: 19.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Michael North
- School of Chemistry, Bedson Building, Newcastle University, Newcastle upon Tyne, NE1 7RU, United Kingdom.
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Preparation of MCM-41 Supported Salen Vanadium Complex and its Catalysis for the Oxidation of Cyclohexane with H2O2 as an Oxidant. J Inorg Organomet Polym Mater 2008. [DOI: 10.1007/s10904-008-9221-0] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Browne WR, Ligtenbarg AGJ, de Boer JW, van den Berg TA, Lutz M, Spek AL, Hartl F, Hage R, Feringa BL. Electronic Properties, Redox Behavior, and Interactions with H2O2 of pH-Sensitive Hydroxyphenyl-1,2,4-triazole-Based Oxovanadium(V) Complexes. Inorg Chem 2006; 45:2903-16. [PMID: 16562946 DOI: 10.1021/ic051848x] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The syntheses and spectroscopic characterization of two 1,2,4-triazole-based oxovanadium(V) complexes are reported: 1- [VO2L1]- and 2 [(VOL2)2(OMe)2] (where H2L1 = 3-(2'-hydroxyphenyl)-5-(pyridin-2' '-yl)-1H-1,2,4-triazole, H3L2 = bis-3,5-(2'-hydroxyphenyl)-1H-1,2,4-triazole). The ligand environment (N,N,O vs O,N,O) is found to have a profound influence on the properties and reactivity of the complexes formed. The presence of the triazolato ligand allows for pH tuning of the spectroscopic and electrochemical properties, as well as the interaction and stability of the complexes in the presence of hydrogen peroxide. The vanadium(IV) oxidation states were generated electrochemically and characterized by UV-vis and EPR spectroscopies. For 2, under acidic conditions, rapid exchange of the methoxide ligands with solvent [in particular, in the vanadium(IV) redox state] was observed.
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Affiliation(s)
- Wesley R Browne
- Department of Organic and Molecular Inorganic Chemistry, Stratingh Institute, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands
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