1
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Kumar R, Keshri R, Prodhan K, Shaikh K, Draksharapu A. A tetranuclear Mn-diamond core complex as a functional mimic of both catechol oxidase and phenoxazinone synthase enzymes. Dalton Trans 2023; 52:15412-15419. [PMID: 37226832 DOI: 10.1039/d3dt00761h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Through dioxygen activation, a tetranuclear Mn(II,III,III,II) diamond core, [Mn4(HPTP*)2(μ-O)2(H2O)4](ClO4)4 (1) complex, has been synthesised using a suitably designed septadentate ligand framework (HPTP*H = 1,3-bis(bis((4-methoxy-3,5-dimethylpyridin-2-yl)methyl)amino)propan-2-ol). The newly prepared complex 1 was characterised using multiple spectroscopic techniques and X-ray crystallography. 1 exhibits excellent catalytic oxidation reactivity for the model substrates, namely, 3,5-di-tert-butylcatechol (3,5-DTBC) and 2-aminophenol, efficiently mimicking the enzymes catechol oxidase and phenoxazinone synthase, respectively. Remarkably, we employed aerial oxygen to catalyze the oxidation of these model substrates, 3,5-DTBC and 2-aminophenol, with turnover numbers of 835 and 14, respectively. A tetranuclear Mn-diamond core complex that mimics both catechol oxidase and phenoxazinone synthase could pave the way for further research into its potential as a multi-enzymatic functional mimic.
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Affiliation(s)
- Rakesh Kumar
- Southern Laboratories-208A, Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur - 208016, India.
| | - Rahul Keshri
- Southern Laboratories-208A, Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur - 208016, India.
| | - Koushik Prodhan
- Southern Laboratories-208A, Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur - 208016, India.
| | - Kanchan Shaikh
- Southern Laboratories-208A, Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur - 208016, India.
| | - Apparao Draksharapu
- Southern Laboratories-208A, Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur - 208016, India.
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2
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Mohammed TP, George A, Sivaramakrishnan MP, Vadivelu P, Balasubramanian S, Sankaralingam M. Deciphering the effect of amine versus imine ligands of copper(II) complexes in 2-aminophenol oxidation. J Inorg Biochem 2023; 247:112309. [PMID: 37451084 DOI: 10.1016/j.jinorgbio.2023.112309] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2023] [Revised: 06/19/2023] [Accepted: 06/27/2023] [Indexed: 07/18/2023]
Abstract
A series of amine (1-6) and imine (5',6') based copper(II) complexes with tridentate (NNO) ligand donors were synthesized and characterized using modern analytical techniques. All the complexes were subjected to 2-aminophenol (OAP) oxidation to form 2-aminophenoxazin-3-one, as a functional analogue of an enzyme, phenoxazinone synthase. In addition, a critical comparison of the reactivity using the amine-based complexes with their respective imine counterparts was achieved in both experimental as well as theoretical studies. For instance, the kinetic measurement revealed that the imine-based copper(II) complexes (kcat, 2.4 × 105-6.2 × 106 h-1) are better than amine-based (kcat, 6.3 × 104-3.9 × 105 h-1) complexes. The complex-substrate adducts [Cu(L3)(OAP)] (7) and [Cu(L3')(OAP)] (7') were characterized for both systems by mass spectrometry. Further, the DFT study was performed with amine- (3) and imine- (3') based copper(II) complexes, to compare their efficacy in the oxidation of OAP. The mechanistic investigations reveal that the key elementary step to determine the reactivity of 3 and 3' is the proton-coupled electron transfer (PCET) step occurring from the intermediates 7/7'. Further, the computed HOMO-LUMO energy gap of 7' was smaller than 7 by 0.8 eV, which indicates the facile PCET compared to that of 7. Moreover, the coupling of the OAP moiety using imine-complexes (ΔGR.E = -5.8 kcal/mol) was found to be thermodynamically more favorable than amine complexes (ΔGR.E = +3.3 kcal/mol). Overall, the theoretical findings are in good agreement with the experimental results.
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Affiliation(s)
- Thasnim P Mohammed
- Bioinspired & Biomimetic Inorganic Chemistry Lab, Department of Chemistry, National Institute of Technology Calicut, Kozhikode, Kerala 673601, India
| | - Akhila George
- Bioinspired & Biomimetic Inorganic Chemistry Lab, Department of Chemistry, National Institute of Technology Calicut, Kozhikode, Kerala 673601, India
| | | | - Prabha Vadivelu
- Department of Chemistry, Central University of Tamil Nadu, Thiruvarur 610 005, India
| | - Sridhar Balasubramanian
- Centre for X-ray Crystallography, CSIR-Indian Institute of Chemical Technology, Hyderabad, Telangana 500007, India; Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
| | - Muniyandi Sankaralingam
- Bioinspired & Biomimetic Inorganic Chemistry Lab, Department of Chemistry, National Institute of Technology Calicut, Kozhikode, Kerala 673601, India.
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3
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Thennarasu AS, Mohammed TP, Sankaralingam M. Mononuclear copper( ii) Schiff base complexes as effective models for phenoxazinone synthase. NEW J CHEM 2022. [DOI: 10.1039/d2nj03934f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Copper(ii) complexes of tridentate (N2O) Schiff base ligands as efficient catalysts for 2-aminophenol oxidation to 2-aminophenoxazin-3-one with excellent reaction rates.
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Affiliation(s)
- Abinaya Sushana Thennarasu
- Bioinspired & Biomimetic Inorganic Chemistry Lab, Department of Chemistry, National Institute of Technology Calicut, Kozhikode, Kerala 673601, India
| | - Thasnim P Mohammed
- Bioinspired & Biomimetic Inorganic Chemistry Lab, Department of Chemistry, National Institute of Technology Calicut, Kozhikode, Kerala 673601, India
| | - Muniyandi Sankaralingam
- Bioinspired & Biomimetic Inorganic Chemistry Lab, Department of Chemistry, National Institute of Technology Calicut, Kozhikode, Kerala 673601, India
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4
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Kumbhakar S, Giri B, Muley A, Karumban KS, Maji S. Design, synthesis, structural, spectral, and redox properties and phenoxazinone synthase activity of tripodal pentacoordinate Mn(II) complexes with impressive turnover numbers. Dalton Trans 2021; 50:16601-16612. [PMID: 34747419 DOI: 10.1039/d1dt01925b] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Catechol oxidase (CO) and phenoxazinone synthase (PHS) are two enzymes of immense significance due to their capability to oxidize catechols and o-aminophenols to o-quinones and phenoxazinones, respectively. In this connection two mononuclear manganese complexes with the molecular framework [MnII(Ln)Cl]Cl {L1: tris((1H-benzo[d]imidazol-2-yl)methyl)amine; n = 1 and L2: tris(N-methylbenzimidazol-2-ylmethyl)amine; n = 2} have been designed to be potential catalysts for OAPH (o-aminophenol) oxidation. Both the ligands and their corresponding metal complexes have been successfully synthesized and thoroughly characterized by different spectroscopic and analytical techniques such as FT-IR, 1H NMR, UV-vis spectroscopy, EPR spectroscopy and ESI mass spectroscopy. The molecular structures of [MnII(L1)Cl]Cl (1) and [MnII(L2)Cl]Cl (2) have been revealed by a single-crystal X-ray diffraction study. The spectral properties and redox behaviour of both the complexes were examined. Under ambient conditions, 1 and 2 show excellent phenoxazinone synthase activity as both are very susceptible to oxidize o-aminophenol to phenoxazinone. The kinetic parameters for both complexes have been determined by analyzing the experimental spectroscopic data. The turnover numbers (kcat value) of these two complexes are extremely high, 440 h-1 and 234 h-1 for 1 and 2, respectively. The present report offers a thorough overview of information involving the role of the metal ions and their extent of phenoxazinone synthase mimicking activity. The oxidation of o-aminophenol to 2-amino-3H-phenoxazine-3-one (APX) by catalytic oxidation of oxygen (O2) by the reaction with transition metal complexes has been an important study for the last few decades. The current study evidently showed better performance of our synthesized Mn(II) complexes than all the predecessors. The plausible mechanism has been reiterated based on the experimental data via ESI-MS spectra and considering the concepts from the previously reported mechanisms involved in the formation of hydrogen peroxide (H2O2) as an intermediate substrate is fairly indicating the involvement of molecular oxygen in the catalytic cycle.
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Affiliation(s)
- Sadananda Kumbhakar
- Department of Chemistry, Indian Institute of Technology, Hyderabad, Kandi, Sangareddy 502284, Telangana, India.
| | - Bishnubasu Giri
- Department of Chemistry, Indian Institute of Technology, Hyderabad, Kandi, Sangareddy 502284, Telangana, India.
| | - Arabinda Muley
- Department of Chemistry, Indian Institute of Technology, Hyderabad, Kandi, Sangareddy 502284, Telangana, India.
| | - Kalai Selvan Karumban
- Department of Chemistry, Indian Institute of Technology, Hyderabad, Kandi, Sangareddy 502284, Telangana, India.
| | - Somnath Maji
- Department of Chemistry, Indian Institute of Technology, Hyderabad, Kandi, Sangareddy 502284, Telangana, India.
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5
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Maji A, Rathi S, Singh A, Singh UP, Ghosh K. Mononuclear iron(III) complexes derived from tridentate ligands containing non‐innocent phenolato donors: Self‐activated nuclease, protease, and phenoxazinone synthase activity studies. Appl Organomet Chem 2021. [DOI: 10.1002/aoc.6185] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Affiliation(s)
- Ankur Maji
- Department of Chemistry Indian Institute of Technology Roorkee Roorkee India
| | - Sweety Rathi
- Department of Chemistry Indian Institute of Technology Roorkee Roorkee India
| | - Anshu Singh
- Department of Chemistry Indian Institute of Technology Roorkee Roorkee India
| | - Udai P. Singh
- Department of Chemistry Indian Institute of Technology Roorkee Roorkee India
| | - Kaushik Ghosh
- Department of Chemistry Indian Institute of Technology Roorkee Roorkee India
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6
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Ramadan AEM, Shaban SY, Ibrahim MM, Eissa H, Al‐Saidi HM, Fathy AM. Catechol oxidase and phenoxazinone synthase mimicking activity, X‐ray diffraction and density function theory study of pyridine and phenolate‐based manganese(II) and iron(III) complexes: Synthesis and spectroscopic characterization. J CHIN CHEM SOC-TAIP 2020. [DOI: 10.1002/jccs.201900383] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
| | - Shaban Y. Shaban
- Chemistry Department, Faculty of ScienceKafr El‐Sheikh University Egypt
| | - Mohamed M. Ibrahim
- Chemistry Department, Faculty of ScienceKafr El‐Sheikh University Egypt
- Chemistry Department, Faculty of ScienceTaif University Taif Saudi Arabia
| | - Hatem Eissa
- Chemistry Department, Faculty of ScienceKafr El‐Sheikh University Egypt
| | - Hamed M. Al‐Saidi
- Chemistry Department, University College in Al‐JamoumUmm Al‐Qura University Makkah Saudi Arabia
| | - Ahmad M. Fathy
- Chemistry Department, Faculty of ScienceZagazig University Zagazig Egypt
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7
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Podder N, Mandal S. Aerobic oxidation of 2-aminophenol catalysed by a series of mononuclear copper(ii) complexes: phenoxazinone synthase-like activity and mechanistic study. NEW J CHEM 2020. [DOI: 10.1039/d0nj02558e] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Biomimetic catalytic oxidation of 2-aminophenol by three mononuclear copper(ii) complexes and the mechanistic aspects are presented.
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Affiliation(s)
- Nirmalya Podder
- Department of Chemistry
- Indian Institute of Technology Kharagpur
- Kharagpur 721302
- India
| | - Sukanta Mandal
- Department of Chemistry
- Indian Institute of Technology Kharagpur
- Kharagpur 721302
- India
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8
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A highly selective and sensitive sensor with imine and phenyl-ethynyl-phenyl units for the visual and fluorescent detection of copper in water. J Photochem Photobiol A Chem 2019. [DOI: 10.1016/j.jphotochem.2019.111893] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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9
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Oloyede HO, Woods JAO, Görls H, Plass W, Eseola AO. The necessity of free and uncrowded coordination environments in biomimetic complex models: oxidative coupling by mixed-ligand cobalt(ii) complexes of diazene–disulfonamide. NEW J CHEM 2019. [DOI: 10.1039/c9nj04396a] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
Importance of molecular access to Co(ii) site is shown by new tridentate disulfonamides, which stabilize uncommon 5-coordinate mixed-ligand vacant-octahedral geometries.
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Affiliation(s)
| | | | - Helmar Görls
- Institut für Anorganische und Analytische Chemie
- Friedrich-Schiller-Universität Jena
- 07743 Jena
- Germany
| | - Winfried Plass
- Institut für Anorganische und Analytische Chemie
- Friedrich-Schiller-Universität Jena
- 07743 Jena
- Germany
| | - Abiodun Omokehinde Eseola
- Institut für Anorganische und Analytische Chemie
- Friedrich-Schiller-Universität Jena
- 07743 Jena
- Germany
- Materials Chemistry group
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10
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Phenoxazinone synthase and antimicrobial activity by a bis(1,3-diamino-2-propanolate) cobalt(III) complex. J CHEM SCI 2018. [DOI: 10.1007/s12039-018-1562-9] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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11
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Thakur S, Sarkar N, Drew MG, Bauzá A, Frontera A, Chattopadhyay S. Estimating the energy of noncovalent interactions in a dioxovanadium(V) Schiff base complex: Exploration of its phenoxazinone synthase like activity. Polyhedron 2018. [DOI: 10.1016/j.poly.2017.11.053] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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12
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Panja A, Frontera A. Valence-Tautomerism-Driven Aromatic Nucleophilic Substitution in Cobalt-Bound Tetrabromocatecholate Ligands - Influence of Positive Charge at the Ligand Backbone on Phenoxazinone Synthase Activity. Eur J Inorg Chem 2018. [DOI: 10.1002/ejic.201701176] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Anangamohan Panja
- Postgraduate Department of Chemistry; Panskura Banamali College; WB 721152 Panskura RS India
| | - Antonio Frontera
- Departament de Química; Universitat de les Illes Balears; Crta. de Valldemossa km 7.5 07122 Palma de Mallorca (Baleares) Spain
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13
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Garai M, Dey D, Yadav HR, Choudhury AR, Maji M, Biswas B. Catalytic Fate of Two Copper Complexes towards Phenoxazinone Synthase and Catechol Dioxygenase Activity. ChemistrySelect 2017. [DOI: 10.1002/slct.201702113] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Mamoni Garai
- Department of Chemistry; Raghunathpur College; Purulia 723 133,West Bengal India
| | - Dhananjay Dey
- Department of Chemistry; Raghunathpur College; Purulia 723 133,West Bengal India
| | - Hare Ram Yadav
- Department of Chemical Sciences; Indian Institute of Science Education and Research, S.A.S. Nagar, Sector 81, Manauli PO; Mohali 140 306 India
| | - Angshuman Roy Choudhury
- Department of Chemical Sciences; Indian Institute of Science Education and Research, S.A.S. Nagar, Sector 81, Manauli PO; Mohali 140 306 India
| | - Milan Maji
- Department of Chemistry; National Institute of Technology; Durgapur 713209, West Bengal India
| | - Bhaskar Biswas
- Department of Chemistry; Raghunathpur College; Purulia 723 133,West Bengal India
- Present Address: Department of Chemistry; Surendranath College; 24/2 M.G. Road, Kolkata 700009, West Bengal India
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14
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Oxidative coupling of 2-aminophenol to 2-amino-phenoxazine-3-one catalyzed by organotin (IV)–copper (I) cyanide coordination polymers as heterogeneous catalysts. ARAB J CHEM 2017. [DOI: 10.1016/j.arabjc.2013.11.005] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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15
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Catechol oxidase and phenoxazinone synthase: Biomimetic functional models and mechanistic studies. Coord Chem Rev 2016. [DOI: 10.1016/j.ccr.2015.11.002] [Citation(s) in RCA: 170] [Impact Index Per Article: 21.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
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16
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Abou Mehrez O, Dossier-Berne F, Legube B. Oxidation of 2-aminophenol to 2-amino-3H-phenoxazin-3-one with monochloramine in aqueous environment: A new method for APO synthesis? CHEMOSPHERE 2016; 145:464-469. [PMID: 26694797 DOI: 10.1016/j.chemosphere.2015.11.073] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/29/2015] [Revised: 11/08/2015] [Accepted: 11/15/2015] [Indexed: 06/05/2023]
Abstract
Reaction of 2-aminophenol (2AP) with monochloramine in aqueous solution was investigated at pH 8.5 and 25 °C, with an excess of monochloramine. 2-Amino-3H-phenoxazin-3-one (APO) was the major product formed in about 70% yield. Despite low formation yields, adsorbable organic halides (AOX) were also formed over reaction time.
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Affiliation(s)
- Odissa Abou Mehrez
- Université de Poitiers, Institut de Chimie des Milieux et Matériaux de Poitiers, CNRS UMR 7285, Equipe Eaux-Géochimie Organique-Santé, Ecole Nationale Supérieure d'Ingénieurs de Poitiers, 1 Rue Marcel Doré, TSA 41105, 86073 Poitiers Cedex 9, France.
| | - Florence Dossier-Berne
- Université de Poitiers, Institut de Chimie des Milieux et Matériaux de Poitiers, CNRS UMR 7285, Equipe Eaux-Géochimie Organique-Santé, Ecole Nationale Supérieure d'Ingénieurs de Poitiers, 1 Rue Marcel Doré, TSA 41105, 86073 Poitiers Cedex 9, France
| | - Bernard Legube
- Université de Poitiers, Institut de Chimie des Milieux et Matériaux de Poitiers, CNRS UMR 7285, Equipe Eaux-Géochimie Organique-Santé, Ecole Nationale Supérieure d'Ingénieurs de Poitiers, 1 Rue Marcel Doré, TSA 41105, 86073 Poitiers Cedex 9, France
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17
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Adhikary J, Chakraborty A, Dasgupta S, Chattopadhyay SK, Kruszynski R, Trzesowska-Kruszynska A, Stepanović S, Gruden-Pavlović M, Swart M, Das D. Unique mononuclear MnIIcomplexes of an end-off compartmental Schiff base ligand: experimental and theoretical studies on their bio-relevant catalytic promiscuity. Dalton Trans 2016; 45:12409-22. [DOI: 10.1039/c6dt00625f] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
MnIISchiff base complexes have been experimentally and theoretically studied for their catecholase and phenoxazinone synthase activity.
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Affiliation(s)
- Jaydeep Adhikary
- Department of Chemistry
- University of Calcutta
- Kolkata 700 009
- India
| | | | | | | | - Rafał Kruszynski
- Department of X-Ray Crystallography and Crystal Chemistry
- Institute of General and Ecological Chemistry
- Lodz University of Technology
- 90-924 Lodz
- Poland
| | - Agata Trzesowska-Kruszynska
- Department of X-Ray Crystallography and Crystal Chemistry
- Institute of General and Ecological Chemistry
- Lodz University of Technology
- 90-924 Lodz
- Poland
| | | | | | - Marcel Swart
- Institut de Química Computacionali Catàlisi (IQCC) and Departament de Química
- Universitat de Girona
- 17071 Girona
- Spain
- Institució Catalana de RecercaiEstudisAvançats (ICREA)
| | - Debasis Das
- Department of Chemistry
- University of Calcutta
- Kolkata 700 009
- India
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18
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Dey SK, Mukherjee A. Investigation of 3d-transition metal acetates in the oxidation of substituted dioxolene and phenols. ACTA ACUST UNITED AC 2015. [DOI: 10.1016/j.molcata.2015.06.020] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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19
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Abstract
During the past decade isoindoline-based ligands became the subject of growing interest due to their modular set-up.
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Affiliation(s)
- Róbert Csonka
- Department of Chemistry
- University of Pannonia
- 8201 Veszprém
- Hungary
| | - Gábor Speier
- Department of Chemistry
- University of Pannonia
- 8201 Veszprém
- Hungary
| | - József Kaizer
- Department of Chemistry
- University of Pannonia
- 8201 Veszprém
- Hungary
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20
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Mahiya K, Kumar R, Lloret F, Mathur P. Oxidation of substituted phenols using copper(II) metallatriangles formed through ligand sharing. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2014; 133:663-668. [PMID: 24996207 DOI: 10.1016/j.saa.2014.06.026] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/19/2014] [Revised: 05/27/2014] [Accepted: 06/03/2014] [Indexed: 06/03/2023]
Abstract
Reaction of N(2),N(2')-bis-[(1-butyl-benzimidazol-2yl)methyl]biphenyl-2,2'-dicarboxamide (L) with CuX2⋅nH2O in methanol leads to the assembly of four trinuclear Cu(II) complexes with the general formula [Cu3(L)3X3]⋅3X⋅nH2O⋅mMeCN, where X=Cl(-), Br(-), NO3(-) and C6H5COO(-) and n=0-5, m=0-8 (compounds 1-4, respectively). The structure of one of the complex contains three Cu(II) metal ions at the corners of an equilateral triangle. Each of the copper(II) are coordinated through two benzimidazolyl imine N-atoms and two amide carbonyl O-atoms and the apical position is occupied by an anionic nitrate ion, leading to a distorted square pyramidal environment. The magnetic susceptibility data were analyzed through Hamiltonian H=-J (S1S2+S2S3+S1S3) obtaining -J=0.16, 0.12, 0.15 and 0.14cm(-1) for 1-4, respectively. X-Band EPR spectra typically show a broad single line at 120K with g∼2.11. Oxidation of phenols was studied homogeneously using copper(II) metallatriangles (1-3) as catalyst in acetonitrile. The oxidation of 2,4,6-tri-tert-butyl phenol yields the corresponding quinone after oxidative dealkylation. The oxidation of 2-amino-5-methyl phenol yields the corresponding phenoxazinone while the oxidation of 2-amino-4-tert-butyl phenol yields the phenoxazine instead of phenoxazinone. The products so obtained were analyzed by NMR and X-ray single crystallography.
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Affiliation(s)
- Kuldeep Mahiya
- Department of Chemistry, University of Delhi, Delhi 110007, India
| | - Ravinder Kumar
- Department of Chemistry, University of Delhi, Delhi 110007, India
| | - Francisco Lloret
- Instituto de Ciencia Molecular (ICMol), Universidad de Valencia, C/Catedratico Jose Beltran 2, 46980 Paterna, Valencia, Spain
| | - Pavan Mathur
- Department of Chemistry, University of Delhi, Delhi 110007, India.
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21
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Dey SK, Mukherjee A. Manganese(III) acetate mediated catalytic oxidation of substituted dioxolene and phenols. ACTA ACUST UNITED AC 2014. [DOI: 10.1016/j.molcata.2014.08.014] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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22
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Yadav A, Mathur P. p-Quinoneimine as an intermediate in the oxidative coupling of 2-amino-5-methylphenol to 4a,7-dimethyldihydro-2-aminophenoxazinone catalyzed by a monomeric copper(II) complex. CATAL COMMUN 2014. [DOI: 10.1016/j.catcom.2014.06.001] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022] Open
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23
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Panja A, Shyamal M, Saha A, Mandal TK. Methylene bridge regulated geometrical preferences of ligands in cobalt(iii) coordination chemistry and phenoxazinone synthase mimicking activity. Dalton Trans 2014; 43:5443-52. [DOI: 10.1039/c3dt52597j] [Citation(s) in RCA: 77] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Hassanein M, El-Khalafy S, Shendy S. 5,10,15,20-Tetrakis-(4-sulfonatophenyl)porphyrinatocobalt(II) supported on ion exchange resin as reusable and effective catalyst for the oxidative coupling of 2-aminophenol to 2-aminophenoxazine-3-one. CATAL COMMUN 2013. [DOI: 10.1016/j.catcom.2013.06.003] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022] Open
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Oxidative Dimerization of o-Aminophenol by Heterogeneous Mesoporous Material Modified with Biomimetic Salen-Type Copper(II) Complex. Catal Letters 2013. [DOI: 10.1007/s10562-012-0959-1] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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El-Khalafy SH, Hassanein M. Oxidation of 2-aminophenol with molecular oxygen and hydrogen peroxide catalyzed by water soluble metalloporphyrins. ACTA ACUST UNITED AC 2012. [DOI: 10.1016/j.molcata.2012.06.002] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Hassanein M, Abdo M, Gerges S, El-Khalafy S. Study of the oxidation of 2-aminophenol by molecular oxygen catalyzed by cobalt(II) phthalocyaninetetrasodiumsulfonate in water. ACTA ACUST UNITED AC 2008. [DOI: 10.1016/j.molcata.2008.03.002] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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May Z, Simándi LI, Vértes A. Iron-assisted, base-catalyzed biomimetic activation of dioxygen by dioximatoiron(II) complexes. ACTA ACUST UNITED AC 2007. [DOI: 10.1016/j.molcata.2006.11.017] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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