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Freire DM, Johnston HM, Smith KJ, Pota K, Mekhail MA, Kharel S, Green KN. Hydrogen Peroxide Disproportionation Activity Is Sensitive to Pyridine Substitutions on Manganese Catalysts Derived from 12-Membered Tetra-Aza Macrocyclic Ligands. Inorg Chem 2023; 62:15842-15855. [PMID: 37729496 PMCID: PMC10829483 DOI: 10.1021/acs.inorgchem.3c01234] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/22/2023]
Abstract
The abundance of manganese in nature and versatility to access different oxidation states have made manganese complexes attractive as catalysts for oxidation reactions in both biology and industry. Macrocyclic ligands offer the advantage of substantially controlling the reactivity of the manganese center through electronic tuning and steric constraint. Inspired by the manganese catalase enzyme, a biological catalyst for the disproportionation of H2O2 into water and O2, the work herein employs 12-membered tetra-aza macrocyclic ligands to study how the inclusion of and substitution to the pyridine ring on the macrocyclic ligand scaffold impacts the reactivity of the manganese complex as a H2O2 disproportionation catalyst. Synthesis and isolation of the manganese complexes was validated by characterization using UV-vis spectroscopy, SC-XRD, and cyclic voltammetry. Potentiometric titrations were used to study the ligand basicity as well as the thermodynamic equilibrium with Mn(II). Manganese complexes were also produced in situ and characterized using electrochemistry for comparison to the isolated species. Results from these studies and H2O2 reactivity showed a remarkable difference among the ligands studied, revealing instead a distinction in the reactivity regarding the number of pyridine rings within the scaffold. Moreover, electron-donating groups on the 4-position of the pyridine ring enhanced the reactivity of the manganese center for H2O2 disproportionation, demonstrating a handle for control of oxidation reactions using the pyridinophane macrocycle.
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Affiliation(s)
- David M Freire
- Department of Chemistry and Biochemistry, Texas Christian University, Fort Worth, Texas 76129, United States
| | - Hannah M Johnston
- Department of Chemistry and Biochemistry, Texas Christian University, Fort Worth, Texas 76129, United States
| | - Katherine J Smith
- Department of Chemistry and Biochemistry, Texas Christian University, Fort Worth, Texas 76129, United States
| | - Kristof Pota
- Department of Chemistry and Biochemistry, Texas Christian University, Fort Worth, Texas 76129, United States
| | - Magy A Mekhail
- Department of Chemistry and Biochemistry, Texas Christian University, Fort Worth, Texas 76129, United States
| | - Sugam Kharel
- Department of Chemistry and Biochemistry, Texas Christian University, Fort Worth, Texas 76129, United States
| | - Kayla N Green
- Department of Chemistry and Biochemistry, Texas Christian University, Fort Worth, Texas 76129, United States
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Johnston HM, Freire DM, Mantsorov C, Jamison N, Green KN. Manganese (III/IV) μ‐oxo Dimers and (III) Monomers with Tetra‐aza Macrocyclic Ligands and Historically Relevant Open‐Chain Ligands. Eur J Inorg Chem 2022; 2022. [DOI: 10.1002/ejic.202200039] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
| | - David M. Freire
- Texas Christian University Chemistry & Biochemistry UNITED STATES
| | | | - Nena Jamison
- Texas Christian University Chemistry & Biochemistry UNITED STATES
| | - Kayla N. Green
- Texas Christian University Department of Chemistry 2950 W. BowieTCU BOX 298860 76129 Fort Worth UNITED STATES
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Freire DM, Beeri D, Pota K, Johnston HM, Palacios P, Pierce BS, Sherman BD, Green KN. Hydrogen Peroxide Disproportionation with Manganese Macrocyclic Complexes of Cyclen and Pyclen. Inorg Chem Front 2020; 7:1573-1582. [PMID: 32457818 DOI: 10.1039/c9qi01509d] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
The catalase family of enzymes, which include a variety with a binuclear manganese active site, mitigate the risk from reactive oxygen species by facilitating the disproportionation of hydrogen peroxide into molecular oxygen and water. In this work, hydrogen peroxide disproportionation using complexes formed between manganese and cyclen or pyclen were investigated due to the spectroscopic similarities with the native MnCAT enzyme. Potentiometric titrations were used to construct speciation diagrams that identify the manganese complex compositions at different pH values. Each complex behaves as a functional mimic of catalase enzymes. UV-visible spectroscopic investigations of the H2O2 decomposition reaction yielded information about the structure of the initial catalyst and intermediates that include monomeric and dimeric species. The results indicate that rigidity imparted by the pyridine ring of pyclen is a key factor in increased TON and TOF values measured compared to cyclen.
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Affiliation(s)
- David M Freire
- Department of Chemistry and Biochemistry, Texas Christian University, 2950 W.Bowie, Fort Worth, TX 76129, United States
| | - Debora Beeri
- Department of Chemistry and Biochemistry, Texas Christian University, 2950 W.Bowie, Fort Worth, TX 76129, United States
| | - Kristof Pota
- Department of Chemistry and Biochemistry, Texas Christian University, 2950 W.Bowie, Fort Worth, TX 76129, United States
| | - Hannah M Johnston
- Department of Chemistry and Biochemistry, Texas Christian University, 2950 W.Bowie, Fort Worth, TX 76129, United States
| | - Philip Palacios
- Department of Chemistry and Biochemistry, The University of Texas at Arlington, 700 Planetarium Place, Arlington, TX 76019
| | - Brad S Pierce
- Department of Chemistry and Biochemistry, University of Alabama, 250 Hackberry Lane, Box 870336 Tuscaloosa, AL 35487
| | - Benjamin D Sherman
- Department of Chemistry and Biochemistry, Texas Christian University, 2950 W.Bowie, Fort Worth, TX 76129, United States
| | - Kayla N Green
- Department of Chemistry and Biochemistry, Texas Christian University, 2950 W.Bowie, Fort Worth, TX 76129, United States
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Tomczyk D, Bukowski W, Bester K. Redox processes in the solution of Ni(II) complex with salen type ligand and in the polymer films. Electrochim Acta 2018. [DOI: 10.1016/j.electacta.2018.02.051] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Tomczyk D, Bukowski W, Bester K, Urbaniak P, Seliger P, Andrijewski G, Skrzypek S. The mechanism of electropolymerization of nickel(ii) salen type complexes. NEW J CHEM 2017. [DOI: 10.1039/c6nj03635j] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Ni(ii) complexes with (±)-trans-N,N′-bis(salicylidene)-1,2-cyclohexanediamine ([Ni(salen)]), and its methyl ([Ni(salen(Me))]) and tert-butyl ([Ni(salen(Bu))]) derivatives have been synthesized.
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Affiliation(s)
- Danuta Tomczyk
- Department of Inorganic and Analytical Chemistry
- University of Łódź
- 91-403 Łódź
- Poland
| | - Wiktor Bukowski
- Faculty of Chemistry
- Rzeszów University of Technology
- 35-959 Rzeszów
- Al. Powstańców W-wy 6
- Poland
| | - Karol Bester
- Faculty of Chemistry
- Rzeszów University of Technology
- 35-959 Rzeszów
- Al. Powstańców W-wy 6
- Poland
| | - Paweł Urbaniak
- Department of Inorganic and Analytical Chemistry
- University of Łódź
- 91-403 Łódź
- Poland
| | - Piotr Seliger
- Department of Inorganic and Analytical Chemistry
- University of Łódź
- 91-403 Łódź
- Poland
| | - Grzegorz Andrijewski
- Department of Inorganic and Analytical Chemistry
- University of Łódź
- 91-403 Łódź
- Poland
| | - Sławomira Skrzypek
- Department of Inorganic and Analytical Chemistry
- University of Łódź
- 91-403 Łódź
- Poland
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SELIGER PIOTR, GUTOWSKA NATALIA, STEFANIAK MONIKA, ROMAŃSKI JAROSŁAW. Investigation on silver complexes of novel 1,2,3-triazole linked crown ethers by NMR analysis. J CHEM SCI 2015. [DOI: 10.1007/s12039-015-0946-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Reductive and oxidative electrochemical study and spectroscopic properties of nickel(II) complexes with N2O2 Schiff bases derived from (±)-trans-N,N′-bis(salicylidene)-1,2-cyclohexanediamine. Electrochim Acta 2014. [DOI: 10.1016/j.electacta.2013.12.073] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Qian J, Yu S, Wang W, Wang L, Tian J, Yan S. Efficient single-strand cleavage of DNA mediated by a MnIIIMnIV-based artificial nuclease. Dalton Trans 2014; 43:2646-55. [DOI: 10.1039/c3dt51904j] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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