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Santra A, Das A, Kaur S, Jain P, Ingole PP, Paria S. Catalytic reduction of oxygen to water by non-heme iron complexes: exploring the effect of the secondary coordination sphere proton exchanging site. Chem Sci 2024; 15:4095-4105. [PMID: 38487234 PMCID: PMC10935699 DOI: 10.1039/d3sc06753j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2023] [Accepted: 02/01/2024] [Indexed: 03/17/2024] Open
Abstract
In this study, we prepared non-heme FeIII complexes (1, 2, and 3) of an N4 donor set of ligands (H2L, Me2L, and BPh2L). 1 is supported by a monoanionic bispyridine-dioxime ligand (HL). In 2 and 3, the primary coordination sphere of Fe remained similar to that in 1, except that the oxime protons of the ligand were replaced with two methyl groups and a bridging -BPh2 moiety, respectively. X-ray structures of the FeII complexes (1a and 3a) revealed similar Fe-N distances; however, they were slightly elongated in 2a. The FeIII/FeII potential of 1, 2, and 3 appeared at -0.31 V, -0.25 V, and 0.07 V vs. Fc+/Fc, respectively, implying that HL and Me2L have comparable donor properties. However, BPh2L is more electron deficient than HL or Me2L. 1 showed electrocatalytic oxygen reduction reaction (ORR) activity in acetonitrile in the presence of trifluoroacetic acid (TFAH) as the proton source at Ecat/2 = -0.45 V and revealed selective 4e-/4H+ reduction of O2 to H2O. 1 showed an effective overpotential (ηeff) of 0.98 V and turnover frequency (TOFmax) of 1.02 × 103 s-1. Kinetic studies revealed a kcat of 2.7 × 107 M-2 s-1. Strikingly, 2 and 3 remained inactive for electrocatalytic ORR, which established the essential role of the oxime scaffolds in the electrocatalytic ORR of 1. Furthermore, a chemical ORR of 1 has been investigated using decamethylferrocene as the electron source. For 1, a similar rate equation was noted to that of the electrocatalytic pathway. A kcat of 6.07 × 104 M-2 s-1 was found chemically. Complex 2, however, underwent a very slow chemical ORR. Complex 3 chemically enhances the 4e-/4H+ reduction of O2 and exhibits a TOF of 0.24 s-1 and a kcat value of 2.47 × 102 M-1 s-1. Based on the experimental observations, we demonstrate that the oxime backbone of the ligand in 1 works as a proton exchanging site in the 4e-/4H+ reduction of O2. The study describes how the ORR is affected by the tuning of the ligand scaffold in a family of non-heme Fe complexes.
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Affiliation(s)
- Aakash Santra
- Department of Chemistry, Indian Institute of Technology Delhi Hauz Khas New Delhi 110016 India
| | - Avijit Das
- Department of Chemistry, Indian Institute of Technology Delhi Hauz Khas New Delhi 110016 India
| | - Simarjeet Kaur
- Department of Chemistry, Indian Institute of Technology Delhi Hauz Khas New Delhi 110016 India
| | - Priya Jain
- Department of Chemistry, Indian Institute of Technology Delhi Hauz Khas New Delhi 110016 India
| | - Pravin P Ingole
- Department of Chemistry, Indian Institute of Technology Delhi Hauz Khas New Delhi 110016 India
| | - Sayantan Paria
- Department of Chemistry, Indian Institute of Technology Delhi Hauz Khas New Delhi 110016 India
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Stynes DV, Doan TN. N-methylpyrazinium ion derivatives of an iron (II) dimethylglyoximatoborate complex. CAN J CHEM 2014. [DOI: 10.1139/cjc-2014-0047] [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
New iron (II) bis(dimethylglyoximatoborate) complexes [Fe(dmgBR2)2(MePz)L]+, R = 4-methoxyphenyl and L = N-methylpyrazinium ion (MePz), tetracyanoethylene (tcne), carbon monoxide, or pyridine are described. The dicationic bis MePz derivative is the first example of a complex containing two small cationic ligands. All adopt the C2vconformation in solution, which serves to sandwich one axial ligand between 4-methoxyphenyl groups. Charge transfer spectra, conformational dynamics, and electrospray mass spectrometry studies are reported. Equilibrium and rate constants for ligand substitution reactions give a binding order trans to MePz: MePz ∼ CO < pyridine, CH3CN.
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Affiliation(s)
- Dennis V. Stynes
- Department of Chemistry, York University, Toronto, ON M3J lP3, Canada
| | - Tran Ngoc Doan
- Department of Chemistry, York University, Toronto, ON M3J lP3, Canada
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Rose MJ, Gray HB, Winkler JR. Hydrogen generation catalyzed by fluorinated diglyoxime-iron complexes at low overpotentials. J Am Chem Soc 2012; 134:8310-3. [PMID: 22583071 DOI: 10.1021/ja300534r] [Citation(s) in RCA: 144] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
Fe(II) complexes containing the fluorinated ligand 1,2-bis(perfluorophenyl)ethane-1,2-dionedioxime (dAr(F)gH(2); H = dissociable proton) exhibit relatively positive Fe(II/I) reduction potentials. The air-stable difluoroborated species [(dAr(F)gBF(2))(2)Fe(py)(2)] (2) electrocatalyzes H(2) generation at -0.9 V vs SCE with i(cat)/i(p) ≈ 4, corresponding to a turnover frequency (TOF) of ∼20 s(-1) [Faradaic yield (FY) = 82 ± 13%]. The corresponding monofluoroborated, proton-bridged complex [(dAr(F)g(2)H-BF(2))Fe(py)(2)] (3) exhibits an improved TOF of ∼200 s(-1) (i(cat)/i(p) ≈ 8; FY = 68 ± 14%) at -0.8 V with an overpotential of 300 mV. Simulations of the electrocatalytic cyclic voltammograms of 2 suggest rate-limiting protonation of an Fe("0") intermediate (k(RLS) ≈ 200 M(-1) s(-1)) that undergoes hydride protonation to form H(2). Complex 3 likely reacts via protonation of an Fe(I) intermediate that subsequently forms H(2) via a bimetallic mechanism (k(RLS) ≈ 2000 M(-1) s(-1)). 3 catalyzes production at relatively positive potentials compared with other iron complexes.
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Affiliation(s)
- Michael J Rose
- Beckman Institute, California Institute of Technology, Pasadena, California 91125, United States
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Rose MJ, Winkler JR, Gray HB. Fe4 Cluster and a Buckled Macrocycle Complex from the Reduction of [(dmgBF2)2Fe(L)2] (L = MeCN, tBuiNC). Inorg Chem 2012; 51:1980-2. [DOI: 10.1021/ic202253v] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Michael J. Rose
- Beckman Institute, California Institute of Technology, Pasadena, California 91125, United States
| | - Jay R. Winkler
- Beckman Institute, California Institute of Technology, Pasadena, California 91125, United States
| | - Harry B. Gray
- Beckman Institute, California Institute of Technology, Pasadena, California 91125, United States
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Kelley P, Radlauer MR, Yanez AJ, Day MW, Agapie T. Metallomacrocycles as ligands: synthesis and characterisation of aluminium-bridged bisglyoximato complexes of palladium and iron. Dalton Trans 2012; 41:8086-92. [DOI: 10.1039/c2dt30285c] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
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Kumar K, Kumar S, Gupta B. Weak interactions between furfuryl and equatorial dioxime ligand in furfuryl(O2)Co(dmgH)2Py: NMR, X-ray and DFT calculations. J Organomet Chem 2010. [DOI: 10.1016/j.jorganchem.2009.11.028] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Geremia S, Garau G, Vaccari L, Sgarra R, Viezzoli MS, Calligaris M, Randaccio L. Cleavage of the iron-methionine bond in c-type cytochromes: Crystal structure of oxidized and reduced cytochrome c2 from Rhodopseudomonas palustris and its ammonia complex. Protein Sci 2009. [DOI: 10.1110/ps.13102] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Bhuyan M, Laskar M, Mandal D, Gupta BD. Co−C Bond Reactivity and Cis Influence Relationship in Benzylcobaloximes with Glyoxime and Dimesitylglyoxime. Organometallics 2007. [DOI: 10.1021/om7003578] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Mouchumi Bhuyan
- Department of Chemistry, Indian Institute of Technology, Kanpur, 208 016, India
| | - Moitree Laskar
- Department of Chemistry, Indian Institute of Technology, Kanpur, 208 016, India
| | - Debaprasad Mandal
- Department of Chemistry, Indian Institute of Technology, Kanpur, 208 016, India
| | - B. D. Gupta
- Department of Chemistry, Indian Institute of Technology, Kanpur, 208 016, India
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Mandal D, Chadha P, Laskar M, Bhuyan M, Gupta B. The interactions between axial and equatorial ligands in cobaloximes: NMR changes. Tetrahedron Lett 2007. [DOI: 10.1016/j.tetlet.2007.01.140] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Mandal D, Gupta BD. Hindered Rotation Leading to Nonequivalence in 2-Substituted Benzyl Cobaloximes: Structure−Property Relationship. Organometallics 2007. [DOI: 10.1021/om060940d] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Debaprasad Mandal
- Department of Chemistry, Indian Institute of Technology, Kanpur, India 208016
| | - B. D. Gupta
- Department of Chemistry, Indian Institute of Technology, Kanpur, India 208016
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Affiliation(s)
- Debaprasad Mandal
- Department of Chemistry, Indian Institute of Technology, Kanpur, 208 016, India
| | - B. D. Gupta
- Department of Chemistry, Indian Institute of Technology, Kanpur, 208 016, India
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Miller JS. Tetracyanoethylene (TCNE): The Characteristic Geometries and Vibrational Absorptions of Its Numerous Structures. Angew Chem Int Ed Engl 2006; 45:2508-25. [PMID: 16596567 DOI: 10.1002/anie.200503277] [Citation(s) in RCA: 140] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Tetracyanoethylene (TCNE) undergoes numerous reactions and is reported to exist in many structural motifs. Identification of these forms and motifs can be challenging. Nonetheless, the number of nu(CN) absorptions and their frequencies provide insight with respect to the specific forms and charge on the TCNE fragment. Particularly informative is the average of the fundamental nu(CN) bands, as well as the length of the central C-C bond. This Review discusses the assignment of structure and formal charge for TCNE-containing compounds. Scrutiny of previous assignments reveals some discrepancies which are discussed, and provides a basis for further study of TCNE structure-function relationships. Several multimetal complexes with bridging [TCNE](z) units exhibit mixed valency and extensive delocalization. The scarcity of suitable model compounds, especially those with M(d(pi-pi*)) backbonding to the CN groups, have thwarted the detailed description of these valence ambiguous compounds; thus, new well-characterized polynuclear compounds are needed.
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Affiliation(s)
- Joel S Miller
- Department of Chemistry, University of Utah, Salt Lake City, UT 84112-0850, USA.
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Miller JS. Tetracyanethylen: die charakteristischen Geometrien und Schwingungsabsorptionen seiner zahlreichen Strukturen. Angew Chem Int Ed Engl 2006. [DOI: 10.1002/ange.200503277] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Synthesis and structures of morpholine substituted new vic-dioxime ligand and its Ni(II) complexes. Inorganica Chim Acta 2004. [DOI: 10.1016/j.ica.2003.05.004] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Structure and Bonding in Boron-Containing Macrocycles and Cages — Comparison to Related Structures with Other Elements Including Organic Molecules. STRUCTURE AND BONDING 2002. [DOI: 10.1007/3-540-47808-6_1] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/12/2023]
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Palazzi A, Stagni S, Bordoni S, Monari M, Selva S. Interannular Conjugation in New Iron(II) 5-Aryl Tetrazolate Complexes. Organometallics 2002. [DOI: 10.1021/om020283z] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Antonio Palazzi
- Dipartimento di Chimica Fisica ed Inorganica, Universitá Bologna, Viale Risorgimento 4, I-40136 Bologna, Italy, and Dipartimento di Chimica “G. Ciamician”, Universitá Bologna, Via Selmi 2, I-40126, Bologna, Italy
| | - Stefano Stagni
- Dipartimento di Chimica Fisica ed Inorganica, Universitá Bologna, Viale Risorgimento 4, I-40136 Bologna, Italy, and Dipartimento di Chimica “G. Ciamician”, Universitá Bologna, Via Selmi 2, I-40126, Bologna, Italy
| | - Silvia Bordoni
- Dipartimento di Chimica Fisica ed Inorganica, Universitá Bologna, Viale Risorgimento 4, I-40136 Bologna, Italy, and Dipartimento di Chimica “G. Ciamician”, Universitá Bologna, Via Selmi 2, I-40126, Bologna, Italy
| | - Magda Monari
- Dipartimento di Chimica Fisica ed Inorganica, Universitá Bologna, Viale Risorgimento 4, I-40136 Bologna, Italy, and Dipartimento di Chimica “G. Ciamician”, Universitá Bologna, Via Selmi 2, I-40126, Bologna, Italy
| | - Simona Selva
- Dipartimento di Chimica Fisica ed Inorganica, Universitá Bologna, Viale Risorgimento 4, I-40136 Bologna, Italy, and Dipartimento di Chimica “G. Ciamician”, Universitá Bologna, Via Selmi 2, I-40126, Bologna, Italy
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Milčić M, Zarić S. Intramolecular Metal Ligand Aromatic Cation−π Interactions in Crystal Structures of Transition Metal Complexes. Eur J Inorg Chem 2001. [DOI: 10.1002/1099-0682(200108)2001:8<2143::aid-ejic2143>3.0.co;2-c] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Dell'Anna MM, Trepanier SJ, McDonald R, Cowie M. Methylene-Bridged Heterobinuclear Complexes of Iridium and Ruthenium: Models for Bimetallic Fischer−Tropsch Catalysts. Organometallics 2000. [DOI: 10.1021/om000639b] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
| | - Steven J. Trepanier
- Chemistry Department, University of Alberta, Edmonton, Alberta, Canada T6G 2G2
| | - Robert McDonald
- Chemistry Department, University of Alberta, Edmonton, Alberta, Canada T6G 2G2
| | - Martin Cowie
- Chemistry Department, University of Alberta, Edmonton, Alberta, Canada T6G 2G2
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Asaro F, Dreos* R, Nardin G, Pellizer G, Peressini S, Randaccio* L, Siega P, Tauzher G, Tavagnacco C. para-Substituted diphenylborylated organocobaloximes: effects of substituents on conformation and redox properties. J Organomet Chem 2000. [DOI: 10.1016/s0022-328x(00)00043-7] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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22
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Randaccio L. Vitamin B12Coenzyme Models: Perspectives on Recent Developments in the Chemistry of the Cobaloximes and Related Models. COMMENT INORG CHEM 1999. [DOI: 10.1080/02603599908012011] [Citation(s) in RCA: 69] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Dreos R, Geremia S, Nardin G, Randaccio L, Tauzher G, Vuano S. Synthesis and structure of borylated organocobaloximes containing neutral nitrile ligands. Inorganica Chim Acta 1998. [DOI: 10.1016/s0020-1693(97)05861-1] [Citation(s) in RCA: 20] [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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Vernik I, Stynes DV. Heterotrinuclear Oxo-Bridged Fe(III)ORu(IV)OFe(III) Complexes of Ruthenium Porphyrin and Borylated Low-Spin Iron Dioximes(1). Inorg Chem 1998; 37:10-17. [PMID: 11670254 DOI: 10.1021/ic9710162] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The synthesis, structure, spectra, and reactivity of diamagnetic linear chain heterotrinuclear oxo-bridged complexes L-Fe(III) N(4)-O-Ru(IV)(TPP')-O-Fe(III)N(4)-L are described where TPP' is tetrakis(4-methoxyphenylporphyrinate), N(4) is one of the borylated bis(dioximate) macrocycles, N(4) = ((DMG)BF(2))(2) in 1, ((DMG)BPh(2))(2) in 2, and ((DPG)BF(2))(2) in 3, and L is a monodentate terminal ligand, L = BuNH(2), CH(3)CN, Py, 1-MeIm, (BuO)(3)P, etc. Crystal data for 3-(BuNH(2))(2) = [(BuNH(2))Fe((DPG)BF(2))(2)-O](2)Ru(TPP') monoclinic space group P2(1)/n, a = 16.845 Å, b = 27.184 Å, c = 24.593 Å, beta = 90.41 degrees, Fe-O = 1.79(1) Å, Ru-O = 1.80(1) Å, Fe-O-Ru = 175 degrees. Large porphyrin and phenyl ring current shifts permit ready characterization of the materials by (1)H NMR. A red-shifted Soret band at 433 nm and two charge transfer transitions in the 650-850 nm region are observed in the visible spectra. Clean reduction of 1, 2, and 3-(CH(3)CN)(2) with 4-tert-butylcatechol is observed giving Fe(II) and Ru(II) products. The kinetics of reduction parallel those of low-spin (&mgr;-oxo)diiron FeN(4) systems showing a 1/[CH(3)CN] dependence, but the rates are 10(3)-10(5) times slower. The Ru(IV) is proposed to stabilize the &mgr;-oxo-Fe bonds toward reductive cleavage via delocalization of the oxo pi electrons onto the ruthenium. Electrochemical data for the heterotrinuclear Fe-O-Ru-O-Fe systems are compared with those for the binuclear Fe-O-Fe systems. The HOMO is stabilized by 120 mV over the corresponding Fe-O-Fe system.
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Affiliation(s)
- Isak Vernik
- Department of Chemistry York University, North York, Ontario, Canada M3J 1P3
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Mazzanti M, Marchon JC, Shang M, Scheidt WR, Jia S, Shelnutt JA. A Pyridine-Sensitive Venus Flytrap Porphyrin. J Am Chem Soc 1997. [DOI: 10.1021/ja972947f] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Diphenylborylated derivatives of organocobaloximes and organorhodoximes: Synthesis, spectroscopic and structural characterisation. J Organomet Chem 1997. [DOI: 10.1016/s0022-328x(97)00405-1] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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