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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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Dutta S, Mayans J, Ghosh A. Facile synthesis of a new Cu(ii) complex with an unsymmetrical ligand and its use as an O 3 donor metalloligand in the synthesis of Cu(ii)-Mn(ii) complexes: structures, magnetic properties, and catalytic oxidase activities. Dalton Trans 2020; 49:1276-1291. [PMID: 31909778 DOI: 10.1039/c9dt04315b] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A new, facile Cu(ii) template method has been employed for the unsymmetrical dicondensation of 1,2-ethylenediamine with salicylaldehyde and o-vanillin. The mononuclear complex, [CuL] (1), thus obtained, has been used as an O3 donor metalloligand for the synthesis of four new Cu(ii)-Mn(ii) complexes, [(CuL)MnCl2] (2), [(CuL)Mn(NO3)2(CH3OH)]n (3), {[(CuL)Mn(benz)(H2O)]2·(CuL)2(ClO4)2} (4) and [(CuL)Mn(benz)Cl]2 (5) (where benz = benzoate). Single-crystal structural analyses reveal that 2 is a dinuclear complex while complex 3 is polymeric with a repeating dinuclear [(CuL)Mn(NO3)2(CH3OH)] unit, linked via the nitrate ion. Both 4 and 5 are discrete tetranuclear complexes, where the dinuclear units [(CuL)Mn(benz)(H2O)] and [(CuL)Mn(benz)Cl] are connected by double benzoate and double chloride bridges, respectively. In complex 4, two monomeric [CuL] units are cocrystallized with the tetranuclear complex. An important difference in the structure of 4 from the other three complexes is that one solvent water molecule is coordinated to each Mn(ii) ion, which makes complex 4 catalytically very active towards mimicking catecholase and phenoxazinone synthase-like oxidation reactions. The turnover numbers (kcat) for the aerial oxidation of 3,5-di-tert-butylcatechol and o-aminophenol are 399 h-1 and 230 h-1, respectively. The evidence of the intermediate species in the mass spectra indicates possible heterometallic cooperation where the Mn(ii) center helps in substrate binding and Cu(ii) participates in the oxidation reactions with molecular oxygen. Cyclic voltammetry measurements suggest the reduction of Cu(ii) to Cu(i) during the catalytic process. Temperature-dependent dc molar magnetic susceptibility measurements reveal that complexes 2-5 are antiferromagnetically coupled with the exchange coupling constants (J) of J = -13.5 cm-1 and J = -13.5 cm-1 for 2 and 3, respectively, J1 = -12.6 cm-1 and J2 = -1.20 cm-1 for complex 4 and J1 = -13.24 cm-1 and J2 = 0.36 cm-1 for complex 5 as is expected from the Cu-O-Mn bridging angles.
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Affiliation(s)
- Sabarni Dutta
- Department of Chemistry, University College of Science, University of Calcutta, 92, A.P.C. Road, Kolkata 700 009, India.
| | - Júlia Mayans
- Departament de Química Inorgànica I Orgànica, Secció Inorgànica and Institut de Nanosciència I Nanotecnologia (IN2UB), Martíi Franqués 1-11, 08028, Barcelona, Spain
| | - Ashutosh Ghosh
- Department of Chemistry, University College of Science, University of Calcutta, 92, A.P.C. Road, Kolkata 700 009, India.
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Hazari A, Das A, Mahapatra P, Ghosh A. Mixed valence trinuclear cobalt (II/III) complexes: Synthesis, structural characterization and phenoxazinone synthase activity. Polyhedron 2017. [DOI: 10.1016/j.poly.2017.06.007] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Mahapatra P, Ghosh S, Giri S, Rane V, Kadam R, Drew MGB, Ghosh A. Subtle Structural Changes in (CuIIL)2MnII Complexes To Induce Heterometallic Cooperative Catalytic Oxidase Activities on Phenolic Substrates (H2L = Salen Type Unsymmetrical Schiff Base). Inorg Chem 2017; 56:5105-5121. [DOI: 10.1021/acs.inorgchem.7b00253] [Citation(s) in RCA: 98] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Prithwish Mahapatra
- Department of Chemistry,
University College of Science, University of Calcutta, 92, A. P. C. Road, Kolkata 700009, India
| | - Soumavo Ghosh
- Department of Chemistry,
University College of Science, University of Calcutta, 92, A. P. C. Road, Kolkata 700009, India
| | - Sanjib Giri
- Department of Chemistry,
University College of Science, University of Calcutta, 92, A. P. C. Road, Kolkata 700009, India
| | - Vinayak Rane
- Radiochemistry division, Bhabha Atomic Research Center, Trombay, Mumbai 400085, India
| | - Ramakant Kadam
- Radiochemistry division, Bhabha Atomic Research Center, Trombay, Mumbai 400085, India
| | - Michael G. B. Drew
- School of Chemistry, The University of Reading, P.O. Box 224, Whiteknights, Reading RG6 6AD, U.K
| | - Ashutosh Ghosh
- Department of Chemistry,
University College of Science, University of Calcutta, 92, A. P. C. Road, Kolkata 700009, India
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Panja A, Jana NC, Adak S, Pramanik K. Insight into the origin of catechol oxidase activity in a rare MnII/MnIII mixed valence ion pair complex: An account of comparative biomimetic catalytic study. Inorganica Chim Acta 2017. [DOI: 10.1016/j.ica.2017.01.024] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Mahato M, Mondal D, Nayek HP. Syntheses, Structures and Phenoxazinone Synthase Activities of Two Cobalt(III) Complexes. ChemistrySelect 2016. [DOI: 10.1002/slct.201601597] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Mamata Mahato
- Department of Applied Chemistry; Indian Institute of Technology (ISM) Dhanbad, 826004; Jharkhand India
| | - Dipanjan Mondal
- Department of Applied Chemistry; Indian Institute of Technology (ISM) Dhanbad, 826004; Jharkhand India
| | - Hari Pada Nayek
- Department of Applied Chemistry; Indian Institute of Technology (ISM) Dhanbad, 826004; Jharkhand India
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Jana NC, Brandão P, Panja A. Tuning the geometry and biomimetic catalytic activity of manganese(III)-tetrabromocatecholate based robust platforms by introducing substitution at pyridine. J Inorg Biochem 2016; 159:96-106. [DOI: 10.1016/j.jinorgbio.2016.02.038] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2015] [Revised: 02/16/2016] [Accepted: 02/29/2016] [Indexed: 10/22/2022]
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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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Panja A, Jana NC, Patra M, Brandão P, Moore CE, Eichhorn DM, Frontera A. Valence tautomerism induced nucleophilic ipso substitution in a coordinated tetrabromocatecholate ligand and diverse catalytic activity mimicking the function of phenoxazinone synthase. ACTA ACUST UNITED AC 2016. [DOI: 10.1016/j.molcata.2015.11.008] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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10
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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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