1
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Beagan DM, Rivera C, Szymczak NK. Appended Lewis Acids Enable Dioxygen Reactivity and Catalytic Oxidations with Ni(II). J Am Chem Soc 2024; 146:12375-12385. [PMID: 38661576 PMCID: PMC11148854 DOI: 10.1021/jacs.3c12399] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/26/2024]
Abstract
We disclose a suite of Ni(II) complexes featuring secondary sphere Lewis acids of varied Lewis acidity and tether lengths. Several of these complexes feature atypical behavior of Ni(II): reactivity with O2 that occurs only in the presence of a tethered Lewis acid. In situ UV-vis spectroscopy revealed that, although adducts are stable at -40 °C, complexes containing 9-borabicyclo[3.3.1]nonane (9-BBN) Lewis acids underwent irreversible oxidative deborylation when warmed to room temperature. We computationally and experimentally identified that oxidative instability of appended 9-BBN moieties can be mitigated using weaker Lewis acids such as pinacolborane (BPin). These insights enabled the realization of catalytic reactions: hydrogen atom abstraction from phenols and room temperature oxygen atom transfer to PPh3.
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Affiliation(s)
- Daniel M Beagan
- University of Michigan, 930 N. University Ave., Ann Arbor, Michigan 48109, United States
| | - Carolina Rivera
- University of Michigan, 930 N. University Ave., Ann Arbor, Michigan 48109, United States
| | - Nathaniel K Szymczak
- University of Michigan, 930 N. University Ave., Ann Arbor, Michigan 48109, United States
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2
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Chen J, Song W, Yao J, Wu Z, Lee YM, Wang Y, Nam W, Wang B. Hydrogen Bonding-Assisted and Nonheme Manganese-Catalyzed Remote Hydroxylation of C-H Bonds in Nitrogen-Containing Molecules. J Am Chem Soc 2023; 145:5456-5466. [PMID: 36811463 DOI: 10.1021/jacs.2c13832] [Citation(s) in RCA: 8] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/24/2023]
Abstract
The development of catalytic systems capable of oxygenating unactivated C-H bonds with excellent site-selectivity and functional group tolerance under mild conditions remains a challenge. Inspired by the secondary coordination sphere (SCS) hydrogen bonding in metallooxygenases, reported herein is an SCS solvent hydrogen bonding strategy that employs 1,1,1,3,3,3-hexafluoroisopropanol (HFIP) as a strong hydrogen bond donor solvent to enable remote C-H hydroxylation in the presence of basic aza-heteroaromatic rings with a low loading of a readily available and inexpensive manganese complex as a catalyst and hydrogen peroxide as a terminal oxidant. We demonstrate that this strategy represents a promising compliment to the current state-of-the-art protection approaches that rely on precomplexation with strong Lewis and/or Brønsted acids. Mechanistic studies with experimental and theoretical approaches reveal the existence of a strong hydrogen bonding between the nitrogen-containing substrate and HFIP, which prevents the catalyst deactivation by nitrogen binding and deactivates the basic nitrogen atom toward oxygen atom transfer and the α-C-H bonds adjacent to the nitrogen center toward H-atom abstraction. Moreover, the hydrogen bonding exerted by HFIP has also been demonstrated not only to facilitate the O-O bond heterolytic cleavage of a putative MnIII-OOH precursor to generate MnV(O)(OC(O)CH2Br) as an active oxidant but also to affect the stability and the activity of MnV(O)(OC(O)CH2Br).
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Affiliation(s)
- Jie Chen
- School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, China
| | - Wenxun Song
- School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, China
| | - Jinping Yao
- School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, China
| | - Zhimin Wu
- Institute of Drug Discovery Technology, Ningbo University, Ningbo 315211, China
| | - Yong-Min Lee
- Department of Chemistry and Nano Science, Ewha Womans University, Seoul 03760, Korea
| | - Yong Wang
- Institute of Drug Discovery Technology, Ningbo University, Ningbo 315211, China
| | - Wonwoo Nam
- Department of Chemistry and Nano Science, Ewha Womans University, Seoul 03760, Korea
| | - Bin Wang
- School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, China
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3
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Cook EN, Machan CW. Bioinspired mononuclear Mn complexes for O 2 activation and biologically relevant reactions. Dalton Trans 2021; 50:16871-16886. [PMID: 34730590 DOI: 10.1039/d1dt03178c] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
A general interest in harnessing the oxidizing power of dioxygen (O2) continues to motivate research efforts on bioinspired and biomimetic complexes to better understand how metalloenzymes mediate these reactions. The ubiquity of Fe- and Cu-based enzymes attracts significant attention and has resulted in many noteworthy developments for abiotic systems interested in direct O2 reduction and small molecule activation. However, despite the existence of Mn-based metalloenzymes with important O2-dependent activity, there has been comparatively less focus on the development of these analogues relative to Fe- and Cu-systems. In this Perspective, we summarize important contributions to the development of bioinspired mononuclear Mn complexes for O2 activation and studies on their reactivity, emphasizing important design parameters in the primary and secondary coordination spheres and outlining mechanistic trends.
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Affiliation(s)
- Emma N Cook
- Department of Chemistry, University of Virginia, PO Box 400319, Charlottesville, VA 22904-4319, USA.
| | - Charles W Machan
- Department of Chemistry, University of Virginia, PO Box 400319, Charlottesville, VA 22904-4319, USA.
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4
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5
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Synthesis, structural and physicochemical properties of a series of manganese(II) complexes with a novel N5 tripodal-amidate ligand and their potential use as water oxidation catalysts. Polyhedron 2021. [DOI: 10.1016/j.poly.2021.115260] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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6
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Mukherjee G, Satpathy JK, Bagha UK, Mubarak MQE, Sastri CV, de Visser SP. Inspiration from Nature: Influence of Engineered Ligand Scaffolds and Auxiliary Factors on the Reactivity of Biomimetic Oxidants. ACS Catal 2021. [DOI: 10.1021/acscatal.1c01993] [Citation(s) in RCA: 24] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Gourab Mukherjee
- Department of Chemistry, Indian Institute of Technology Guwahati, 781039, Assam, India
| | - Jagnyesh K. Satpathy
- Department of Chemistry, Indian Institute of Technology Guwahati, 781039, Assam, India
| | - Umesh K. Bagha
- Department of Chemistry, Indian Institute of Technology Guwahati, 781039, Assam, India
| | - M. Qadri E. Mubarak
- Manchester Institute of Biotechnology, The University of Manchester, 131 Princess Street, Manchester M1 7DN, United Kingdom
- Fakulti Sains dan Teknologi, Universiti Sains Islam Malaysia, Bandar Baru Nilai, 71800 Nilai, Negeri Sembilan Malaysia
| | - Chivukula V. Sastri
- Department of Chemistry, Indian Institute of Technology Guwahati, 781039, Assam, India
| | - Sam P. de Visser
- Department of Chemistry, Indian Institute of Technology Guwahati, 781039, Assam, India
- Manchester Institute of Biotechnology, The University of Manchester, 131 Princess Street, Manchester M1 7DN, United Kingdom
- Department of Chemical Engineering and Analytical Science, The University of Manchester, Oxford Road, Manchester M13 9PL, United Kingdom
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7
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Webster AM, Peacock AFA. De novo designed coiled coils as scaffolds for lanthanides, including novel imaging agents with a twist. Chem Commun (Camb) 2021; 57:6851-6862. [DOI: 10.1039/d1cc02013g] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
The design of artificial miniature lanthanide proteins, provide an opportunity to access new functional metalloproteins as well as insight into native lanthanide biochemistry.
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8
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Zahan R, Ahmed S, Sharmin T, Halim MA, Rahi MS, Sheikh MC, Miyatake R, Zangrando E, Naz T, Islam MA, Reza MA. Synthesis of bis[benzyl‐
N′
‐hydrazinecarbodithioato‐
κ
2
N′
,
S
]nickel(II) complex as a novel lead molecule for cancer treatment. Appl Organomet Chem 2021. [DOI: 10.1002/aoc.6036] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
- Ronok Zahan
- Department of Pharmacy University of Rajshahi Rajshahi 6205 Bangladesh
- Institute of Biological Sciences University of Rajshahi Rajshahi 6205 Bangladesh
| | - Sinthyia Ahmed
- Department of Computer‐aided Drug Design The Red‐Green Research Centre Dhaka 1215 Bangladesh
| | - Tahmida Sharmin
- Department of Pharmacy University of Rajshahi Rajshahi 6205 Bangladesh
| | - Mohammad A. Halim
- Department of Computer‐aided Drug Design The Red‐Green Research Centre Dhaka 1215 Bangladesh
- Department of Physical Sciences University of Arkansas‐Fort Smith Fort Smith AR 72913 USA
| | - Md. Sifat Rahi
- Department of Genetic Engineering and Biotechnology University of Rajshahi Rajshahi 6205 Bangladesh
- Department of Genetic Engineering and Biotechnology Jashore University of Science and Technology Jashore 7408 Bangladesh
| | - Md. Chanmiya Sheikh
- Department of Applied Science, Faculty of Science Okayama University of Science 1‐1 Riomachi, Kita‐ku Okayama City 700‐0005 Japan
| | - Ryuta Miyatake
- Department of Applied Chemistry, Faculty of Engineering University of Toyama 3190 Gofuku Toyama 930‐8555 Japan
| | - Ennio Zangrando
- Department of Chemical and Pharmaceutical Sciences Via L. Giorgieri 1 Trieste 34127 Italy
| | - Tarannum Naz
- Department of Pharmacy University of Rajshahi Rajshahi 6205 Bangladesh
| | | | - Md Abu Reza
- Department of Genetic Engineering and Biotechnology University of Rajshahi Rajshahi 6205 Bangladesh
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9
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Jana NC, Brandão P, Frontera A, Panja A. A facile biomimetic catalytic activity through hydrogen atom abstraction by the secondary coordination sphere in manganese(III) complexes. Dalton Trans 2020; 49:14216-14230. [PMID: 33025999 DOI: 10.1039/d0dt02431g] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
This paper describes the synthesis and structural characterization of four new manganese(iii) complexes (1-4) derived from N3O donor Schiff base ligands and their biomimetic catalytic activities related to catechol oxidase and phenoxazinone synthase. X-ray crystallography reveals that the Schiff bases coordinate the metal centre in a tridentate fashion, leaving the pendant tertiary amine nitrogen atom either protonated or free to balance the charge of the system, and these pendant triamines participate in strong hydrogen bonding interactions in the solid state. The hydrogen bonding ability of the pendant triamines at the second coordination sphere plays a crucial role in the substrate recognition and the stability of the complex-substrate intermediates. The effect of substitution at the phenolate ring towards the redox potential of the metal centre and the catalytic activity of these complexes has been observed. Detailed kinetic studies further disclose the deuterium kinetic isotope effect in which the transfer of the proton along the hydrogen bond from the substrates to the pendant triamine group at the secondary coordination sphere occurs at the key step in the catalytic reaction. The present reactivity nicely resembles the biochemical reactivities in the natural system in which a concerted electron and proton transfer to different species is usually observed. Remarkably, although some sort of influence of the secondary coordination sphere on catalytic activity has been reported mimicking the function of these metalloenzymes, such a direct participation of the secondary coordination sphere, particularly in modelling phenoxazinone synthase, has not been observed to date.
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Affiliation(s)
- Narayan Ch Jana
- Department of Chemistry, Panskura Banamali College, Panskura RS, WB 721152, India.
| | - Paula Brandão
- Department of Chemistry, CICECO-Aveiro Institute of Materials, University of Aveiro, 3810-193 Aveiro, Portugal
| | - Antonio Frontera
- Departament de Química, Universitat de les Illes Balears, Crta de Valldemossa, km 7.5, 07122 Palma de Mallorca, Baleares, Spain
| | - Anangamohan Panja
- Department of Chemistry, Panskura Banamali College, Panskura RS, WB 721152, India. and Department of Chemistry, Gokhale Memorial Girls' College, 1/1 Harish Mukherjee Road, Kolkata-700020, India
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10
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Sen A, Vyas N, Pandey B, Rajaraman G. Deciphering the mechanism of oxygen atom transfer by non-heme Mn IV-oxo species: an ab initio and DFT exploration. Dalton Trans 2020; 49:10380-10393. [PMID: 32613212 DOI: 10.1039/d0dt01785j] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
Oxygen atom transfer (OAT) reactions employing transition metal-oxo species have tremendous significance in homogeneous catalysis for industrial use. Understanding the structural and mechanistic aspects of OAT reactions using high-valent metal-oxo species is of great importance to fine-tune their reactivity. Herein we examine the reactivity of a non-heme high-valent oxo-manganese(iv) complex, [MnIVH3buea(O)]- towards a variety of substrates such as PPh2Me, PPhMe2, PCy3, PPh3, and PMe3 using density functional theory as well as ab initio CASSCF/NEVPT2 methods. We have initially explored the structure and bonding of [MnIVH3buea(O)]- and its congener [MnIVH3buea(S)]-. Our calculations affirm an S = 3/2 ground state of the catalyst with the S = 5/2 and S = 1/2 excited states predicted to be too high lying in energy to participate in the reaction mechanism. Our ab initio CASSCF/NEVPT2 calculations, however, reveal a strong multi-reference character for the ground S = 3/2 state with many low-lying quartets mixing significantly with the ground state. This opens up various reaction channels, and the admixed wave-function evolves during the reaction with the excited triplet dominating the ground state wave-function at the reactant complex. Our calculations predict the following pattern of reactivity, PCy3 < PMe3 < PPh3 < PPhMe2 < PPh2Me for the OAT reaction with the MnIV[double bond, length as m-dash]O species which correlates well with the experimental observations. Detailed electronic structure analysis of the transitions states reveal that these substrates react via an unusual low-energy δ-type pathway where a spin-up electron from the substrate is transferred to the δ*x2-y2 orbital of the MnIV[double bond, length as m-dash]O facilitated by its multi-reference character. The unusual reactivity observed here has implications in understanding the reactivity of [Mn4Ca] species in photosystem II.
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Affiliation(s)
- Asmita Sen
- Department of Chemistry, Indian Institute of Technology Bombay, Mumbai 400076, India.
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11
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Oswald VF, Lee JL, Biswas S, Weitz AC, Mittra K, Fan R, Li J, Zhao J, Hu MY, Alp EE, Bominaar EL, Guo Y, Green MT, Hendrich MP, Borovik AS. Effects of Noncovalent Interactions on High-Spin Fe(IV)-Oxido Complexes. J Am Chem Soc 2020; 142:11804-11817. [PMID: 32489096 DOI: 10.1021/jacs.0c03085] [Citation(s) in RCA: 37] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
High-valent nonheme FeIV-oxido species are key intermediates in biological oxidation, and their properties are proposed to be influenced by the unique microenvironments present in protein active sites. Microenvironments are regulated by noncovalent interactions, such as hydrogen bonds (H-bonds) and electrostatic interactions; however, there is little quantitative information about how these interactions affect crucial properties of high valent metal-oxido complexes. To address this knowledge gap, we introduced a series of FeIV-oxido complexes that have the same S = 2 spin ground state as those found in nature and then systematically probed the effects of noncovalent interactions on their electronic, structural, and vibrational properties. The key design feature that provides access to these complexes is the new tripodal ligand [poat]3-, which contains phosphinic amido groups. An important structural aspect of [FeIVpoat(O)]- is the inclusion of an auxiliary site capable of binding a Lewis acid (LAII); we used this unique feature to further modulate the electrostatic environment around the Fe-oxido unit. Experimentally, studies confirmed that H-bonds and LAII s can interact directly with the oxido ligand in FeIV-oxido complexes, which weakens the Fe═O bond and has an impact on the electronic structure. We found that relatively large vibrational changes in the Fe-oxido unit correlate with small structural changes that could be difficult to measure, especially within a protein active site. Our work demonstrates the important role of noncovalent interactions on the properties of metal complexes, and that these interactions need to be considered when developing effective oxidants.
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Affiliation(s)
- Victoria F Oswald
- Department of Chemistry, 1102 Natural Sciences II, University of California at Irvine, Irvine, California 92697, United States
| | - Justin L Lee
- Department of Chemistry, 1102 Natural Sciences II, University of California at Irvine, Irvine, California 92697, United States
| | - Saborni Biswas
- Department of Chemistry, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, United States
| | - Andrew C Weitz
- Department of Chemistry, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, United States
| | - Kaustuv Mittra
- Department of Molecular Biosciences and Biochemistry, University of California at Irvine, Irvine, California 92697, United States
| | - Ruixi Fan
- Department of Chemistry, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, United States
| | - Jikun Li
- Department of Chemistry, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, United States
| | - Jiyong Zhao
- Advanced Photon Source, Argonne National Laboratory, Lemont, Illinois 60439, United States
| | - Michael Y Hu
- Advanced Photon Source, Argonne National Laboratory, Lemont, Illinois 60439, United States
| | - Esen E Alp
- Advanced Photon Source, Argonne National Laboratory, Lemont, Illinois 60439, United States
| | - Emile L Bominaar
- Department of Chemistry, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, United States
| | - Yisong Guo
- Department of Chemistry, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, United States
| | - Michael T Green
- Department of Chemistry, 1102 Natural Sciences II, University of California at Irvine, Irvine, California 92697, United States.,Department of Molecular Biosciences and Biochemistry, University of California at Irvine, Irvine, California 92697, United States
| | - Michael P Hendrich
- Department of Chemistry, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, United States
| | - A S Borovik
- Department of Chemistry, 1102 Natural Sciences II, University of California at Irvine, Irvine, California 92697, United States
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12
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Oktawiec J, Jiang HZH, Vitillo JG, Reed DA, Darago LE, Trump BA, Bernales V, Li H, Colwell KA, Furukawa H, Brown CM, Gagliardi L, Long JR. Negative cooperativity upon hydrogen bond-stabilized O 2 adsorption in a redox-active metal-organic framework. Nat Commun 2020; 11:3087. [PMID: 32555184 PMCID: PMC7303157 DOI: 10.1038/s41467-020-16897-z] [Citation(s) in RCA: 29] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2020] [Accepted: 04/13/2020] [Indexed: 12/20/2022] Open
Abstract
The design of stable adsorbents capable of selectively capturing dioxygen with a high reversible capacity is a crucial goal in functional materials development. Drawing inspiration from biological O2 carriers, we demonstrate that coupling metal-based electron transfer with secondary coordination sphere effects in the metal-organic framework Co2(OH)2(bbta) (H2bbta = 1H,5H-benzo(1,2-d:4,5-d')bistriazole) leads to strong and reversible adsorption of O2. In particular, moderate-strength hydrogen bonding stabilizes a cobalt(III)-superoxo species formed upon O2 adsorption. Notably, O2-binding in this material weakens as a function of loading, as a result of negative cooperativity arising from electronic effects within the extended framework lattice. This unprecedented behavior extends the tunable properties that can be used to design metal-organic frameworks for adsorption-based applications.
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Affiliation(s)
- Julia Oktawiec
- Department of Chemistry, University of California, Berkeley, CA, 94720, USA
| | - Henry Z H Jiang
- Department of Chemistry, University of California, Berkeley, CA, 94720, USA
| | - Jenny G Vitillo
- Department of Chemistry and Supercomputing Institute, University of Minnesota, Minneapolis, MN, 55455, USA
| | - Douglas A Reed
- Department of Chemistry, University of California, Berkeley, CA, 94720, USA
| | - Lucy E Darago
- Department of Chemistry, University of California, Berkeley, CA, 94720, USA
| | - Benjamin A Trump
- National Institute of Standards and Technology, Center for Neutron Research, Gaithersburg, MD, 20899, USA
| | - Varinia Bernales
- Department of Chemistry and Supercomputing Institute, University of Minnesota, Minneapolis, MN, 55455, USA
| | - Harriet Li
- Department of Aeronautics and Astronautics, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA
| | - Kristen A Colwell
- Department of Chemical and Biomolecular Engineering, University of California, Berkeley, CA, 94720, USA
| | - Hiroyasu Furukawa
- Department of Chemistry, University of California, Berkeley, CA, 94720, USA
- Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA
| | - Craig M Brown
- National Institute of Standards and Technology, Center for Neutron Research, Gaithersburg, MD, 20899, USA
- Chemical and Biomolecular Engineering, University of Delaware, Newark, DE, 19716, USA
| | - Laura Gagliardi
- Department of Chemistry and Supercomputing Institute, University of Minnesota, Minneapolis, MN, 55455, USA
| | - Jeffrey R Long
- Department of Chemistry, University of California, Berkeley, CA, 94720, USA.
- Department of Chemical and Biomolecular Engineering, University of California, Berkeley, CA, 94720, USA.
- Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA.
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13
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Affiliation(s)
- Charles W. Machan
- University of Virginia, McCormick Road,
PO Box 400319, Charlottesville, Virginia 22904-4319, United States
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14
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Gordon Z, Miller TJ, Leahy CA, Matson EM, Burgess M, Drummond MJ, Popescu CV, Smith CM, Lord RL, Rodríguez-López J, Fout AR. Characterization of Terminal Iron(III)-Oxo and Iron(III)-Hydroxo Complexes Derived from O 2 Activation. Inorg Chem 2019; 58:15801-15811. [PMID: 31714068 DOI: 10.1021/acs.inorgchem.9b02079] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
O2 activation at nonheme iron centers is a common motif in biological systems. While synthetic models have provided numerous insights into the reactivity of high-valent iron-oxo complexes related to biological processes, the majority of these complexes are synthesized using alternative oxidants. This report describes O2 activation by an iron(II)-triflate complex of the imino-functionalized tris(pyrrol-2-ylmethyl)amine ligand framework, H3[N(piCy)3]. Initial reaction conditions result in the formation of a mixture of oxidation products including terminal iron(III)-oxo and iron(III)-hydroxo complexes. The relevance of these species to the O2 activation process is demonstrated through reactivity studies and electrochemical analysis of the iron(III)-oxo complex.
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Affiliation(s)
- Zachary Gordon
- Department of Chemistry , University of Illinois at Urbana-Champaign , 600 South Mathews Avenue , Urbana , Illinois 61801 , United States
| | - Tabitha J Miller
- Department of Chemistry , University of Illinois at Urbana-Champaign , 600 South Mathews Avenue , Urbana , Illinois 61801 , United States
| | - Clare A Leahy
- Department of Chemistry , University of Illinois at Urbana-Champaign , 600 South Mathews Avenue , Urbana , Illinois 61801 , United States
| | - Ellen M Matson
- Department of Chemistry , University of Illinois at Urbana-Champaign , 600 South Mathews Avenue , Urbana , Illinois 61801 , United States
| | - Mark Burgess
- Department of Chemistry , University of Illinois at Urbana-Champaign , 600 South Mathews Avenue , Urbana , Illinois 61801 , United States
| | - Michael J Drummond
- Department of Chemistry , University of Illinois at Urbana-Champaign , 600 South Mathews Avenue , Urbana , Illinois 61801 , United States
| | - Codrina V Popescu
- Department of Chemistry , University of St. Thomas , 2115 Summit Avenue , St. Paul , Minnesota 55105 , United States
| | - Connor M Smith
- Department of Chemistry , University of St. Thomas , 2115 Summit Avenue , St. Paul , Minnesota 55105 , United States
| | - Richard L Lord
- Department of Chemistry , Grand Valley State University , 1 Campus Drive Allendale , Michigan 49401 , United States
| | - Joaquín Rodríguez-López
- Department of Chemistry , University of Illinois at Urbana-Champaign , 600 South Mathews Avenue , Urbana , Illinois 61801 , United States
| | - Alison R Fout
- Department of Chemistry , University of Illinois at Urbana-Champaign , 600 South Mathews Avenue , Urbana , Illinois 61801 , United States
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15
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Gardner EJ, Cobb CR, Bertke JA, Warren TH. Tris(pyrazolyl)borate Copper Hydroxide Complexes Featuring Tunable Intramolecular H-Bonding. Inorg Chem 2019; 58:11248-11255. [DOI: 10.1021/acs.inorgchem.9b01991] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Evan J. Gardner
- Department of Chemistry, Georgetown University, Box 51277-1227, Washington, D.C. 20057, United States
| | - Caitlyn R. Cobb
- Department of Chemistry, Georgetown University, Box 51277-1227, Washington, D.C. 20057, United States
| | - Jeffery A. Bertke
- Department of Chemistry, Georgetown University, Box 51277-1227, Washington, D.C. 20057, United States
| | - Timothy H. Warren
- Department of Chemistry, Georgetown University, Box 51277-1227, Washington, D.C. 20057, United States
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16
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Wegeberg C, Browne WR, McKenzie CJ. cis Donor Influence on O–O Bond Lability in Iron(III) Hydroperoxo Complexes: Oxidation Catalysis and Ligand Transformation. Inorg Chem 2019; 58:8983-8994. [DOI: 10.1021/acs.inorgchem.9b00247] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Christina Wegeberg
- Department of Physics, Chemistry and Pharmacy, University of Southern Denmark, Campusvej 55, 5230 Odense M, Denmark
- Molecular Inorganic Chemistry, Stratingh Institute for Chemistry, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands
| | - Wesley R. Browne
- Molecular Inorganic Chemistry, Stratingh Institute for Chemistry, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands
| | - Christine J. McKenzie
- Department of Physics, Chemistry and Pharmacy, University of Southern Denmark, Campusvej 55, 5230 Odense M, Denmark
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17
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Wang L, Gennari M, Cantú Reinhard FG, Gutiérrez J, Morozan A, Philouze C, Demeshko S, Artero V, Meyer F, de Visser SP, Duboc C. A Non-Heme Diiron Complex for (Electro)catalytic Reduction of Dioxygen: Tuning the Selectivity through Electron Delivery. J Am Chem Soc 2019; 141:8244-8253. [DOI: 10.1021/jacs.9b02011] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Affiliation(s)
- Lianke Wang
- Université Grenoble Alpes, CNRS UMR 5250, DCM, F-38000 Grenoble, France
| | - Marcello Gennari
- Université Grenoble Alpes, CNRS UMR 5250, DCM, F-38000 Grenoble, France
| | - Fabián G. Cantú Reinhard
- Manchester Institute of Biotechnology and School of Chemical Engineering and Analytical Science, The University of Manchester, 131 Princess Street, Manchester M1 7DN, United Kingdom
| | - Javier Gutiérrez
- Université Grenoble Alpes, CNRS UMR 5250, DCM, F-38000 Grenoble, France
| | - Adina Morozan
- Université Grenoble Alpes, CNRS, CEA, Laboratoire de Chimie et
Biologie des Métaux, F-38000 Grenoble, France
| | | | - Serhiy Demeshko
- Institut für Anorganische Chemie, Universität Göttingen, Tammannstrasse 4, D-37077 Göttingen, Germany
| | - Vincent Artero
- Université Grenoble Alpes, CNRS, CEA, Laboratoire de Chimie et
Biologie des Métaux, F-38000 Grenoble, France
| | - Franc Meyer
- Institut für Anorganische Chemie, Universität Göttingen, Tammannstrasse 4, D-37077 Göttingen, Germany
| | - Sam P. de Visser
- Manchester Institute of Biotechnology and School of Chemical Engineering and Analytical Science, The University of Manchester, 131 Princess Street, Manchester M1 7DN, United Kingdom
| | - Carole Duboc
- Université Grenoble Alpes, CNRS UMR 5250, DCM, F-38000 Grenoble, France
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18
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Sharma B, Striegler S. Tailored Interactions of the Secondary Coordination Sphere Enhance the Hydrolytic Activity of Cross-Linked Microgels. ACS Catal 2019. [DOI: 10.1021/acscatal.8b04740] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Babloo Sharma
- Department of Chemistry and Biochemistry, University of Arkansas, 345 North Campus Drive, Fayetteville, Arkansas 72701, United States
| | - Susanne Striegler
- Department of Chemistry and Biochemistry, University of Arkansas, 345 North Campus Drive, Fayetteville, Arkansas 72701, United States
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19
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Oswald VF, Weitz AC, Biswas S, Ziller JW, Hendrich MP, Borovik AS. Manganese-Hydroxido Complexes Supported by a Urea/Phosphinic Amide Tripodal Ligand. Inorg Chem 2018; 57:13341-13350. [PMID: 30299920 DOI: 10.1021/acs.inorgchem.8b01886] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Hydrogen bonds (H-bonds) within the secondary coordination sphere are often invoked as essential noncovalent interactions that lead to productive chemistry in metalloproteins. Incorporating these types of effects within synthetic systems has proven a challenge in molecular design that often requires the use of rigid organic scaffolds to support H-bond donors or acceptors. We describe the preparation and characterization of a new hybrid tripodal ligand ([H2pout]3-) that contains two monodeprotonated urea groups and one phosphinic amide. The urea groups serve as H-bond donors, while the phosphinic amide group serves as a single H-bond acceptor. The [H2pout]3- ligand was utilized to stabilize a series of Mn-hydroxido complexes in which the oxidation state of the metal center ranges from 2+ to 4+. The molecular structure of the MnIII-OH complex demonstrates that three intramolecular H-bonds involving the hydroxido ligand are formed. Additional evidence for the formation of intramolecular H-bonds was provided by vibrational spectroscopy in which the energy of the O-H vibration supports its assignment as an H-bond donor. The stepwise oxidation of [MnIIH2pout(OH)]2- to its higher oxidized analogs was further substantiated by electrochemical measurements and results from electronic absorbance and electron paramagnetic resonance spectroscopies. Our findings illustrate the utility of controlling both the primary and secondary coordination spheres to achieve structurally similar Mn-OH complexes with varying oxidation states.
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Affiliation(s)
- Victoria F Oswald
- Department of Chemistry , University of California-Irvine , 1102 Natural Sciences II , Irvine , California 92697 , United States
| | - Andrew C Weitz
- Department of Chemistry , Carnegie Mellon University , Pittsburgh , Pennsylvania 15213 , United States
| | - Saborni Biswas
- Department of Chemistry , Carnegie Mellon University , Pittsburgh , Pennsylvania 15213 , United States
| | - Joseph W Ziller
- Department of Chemistry , University of California-Irvine , 1102 Natural Sciences II , Irvine , California 92697 , United States
| | - Michael P Hendrich
- Department of Chemistry , Carnegie Mellon University , Pittsburgh , Pennsylvania 15213 , United States
| | - A S Borovik
- Department of Chemistry , University of California-Irvine , 1102 Natural Sciences II , Irvine , California 92697 , United States
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20
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Sugiarto, Kawamoto K, Hayashi Y. Strategic Isolation of a Polyoxocation Mimicking Vanadium(V) Oxide Layered-Structure by Stacking of [H 2V 2O 8] 4- Anions Bridged by (1,4,7-Triazacyclononane)Co(III) Complexes. Front Chem 2018; 6:375. [PMID: 30211155 PMCID: PMC6121072 DOI: 10.3389/fchem.2018.00375] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2018] [Accepted: 08/03/2018] [Indexed: 12/27/2022] Open
Abstract
An isolation of a vanadium(V) oxide cluster mimicking V2O5 layered structure was achieved formulated as [{Co(tacn)}4V4O12(OH)4]4+ (1) (tacn = 1,4,7-triazacyclononane). From the 51V NMR spectra of the reaction mixtures, we optimized the reaction condition in terms of a molar ratio of VO43- and [Co(tacn)(H2O)3]3+ as well as a pH value. Cluster 1 is stable in a wide range of pH values from 1.5 to 8.0, and the presence of multiple hydrogen bondings in the structure is a unique feature. In the X-ray analysis of cluster 1, the V⋯ V distances are classified into two groups of relatively shorter distances (2.978(1) Å) and longer interactions (3.554(1) Å), and it is a good model of the substructure of V2O5 bulk material. As far as we know, this is a first example of an isolation of mixed-metal cluster including a unit of V2O5 structure by a stack of two layers of [H2V2O8]4-, although cubic V4O4 cubane-type clusters are well known. The solid sample of compound 1-Cl and 1-Br shows reversible thermochromic behavior accompanied by crystal to amorphous transformation upon hydration-dehydration process.
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Affiliation(s)
- Sugiarto
- Department of Chemistry, Kanazawa University, Kanazawa, Japan
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21
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Mann SI, Heinisch T, Ward TR, Borovik AS. Coordination chemistry within a protein host: regulation of the secondary coordination sphere. Chem Commun (Camb) 2018; 54:4413-4416. [PMID: 29645031 PMCID: PMC5942233 DOI: 10.1039/c8cc01931b] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
Secondary coordination spheres of metal complexes are instrumental in controlling properties that are linked to function. To study these effects in aqueous solutions artificial Cu proteins have been developed using biotin-streptavidin (Sav) technology and their binding of external azide ions investigated. Parallel binding studies were done in crystallo on single crystals of the artificial Cu proteins. Spectroscopic changes in solution are consistent with azide binding to the Cu centers. Structural studies corroborate that a Cu-N3 unit is present in each Sav subunit and reveal the composition of hydrogen bonding (H-bonding) networks that include the coordinated azido ligand. The networks involve amino acid residues and water molecules within the secondary coordination sphere. Mutation of these residues to ones that cannot form H-bonds caused a measurble change in the equilibrium binding constants that were measured in solution. These findings further demonstrate the utility of biotin-Sav technology to prepare water-stable inorganic complexes whose structures can be controlled within both primary and secondary coordination spheres.
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Affiliation(s)
- Samuel I Mann
- Department of Chemistry, 1102 Natural Science II, University of California, Irvine, CA 92697, USA.
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22
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Pegis ML, Wise CF, Martin DJ, Mayer JM. Oxygen Reduction by Homogeneous Molecular Catalysts and Electrocatalysts. Chem Rev 2018; 118:2340-2391. [PMID: 29406708 DOI: 10.1021/acs.chemrev.7b00542] [Citation(s) in RCA: 321] [Impact Index Per Article: 53.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
The oxygen reduction reaction (ORR) is a key component of biological processes and energy technologies. This Review provides a comprehensive report of soluble molecular catalysts and electrocatalysts for the ORR. The precise synthetic control and relative ease of mechanistic study for homogeneous molecular catalysts, as compared to heterogeneous materials or surface-adsorbed species, enables a detailed understanding of the individual steps of ORR catalysis. Thus, the Review places particular emphasis on ORR mechanism and thermodynamics. First, the thermochemistry of oxygen reduction and the factors influencing ORR efficiency are described to contextualize the discussion of catalytic studies that follows. Reports of ORR catalysis are presented in terms of their mechanism, with separate sections for catalysis proceeding via initial outer- and inner-sphere electron transfer to O2. The rates and selectivities (for production of H2O2 vs H2O) of these catalysts are provided, along with suggested methods for accurately comparing catalysts of different metals and ligand scaffolds that were examined under different experimental conditions.
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Affiliation(s)
- Michael L Pegis
- Department of Chemistry , Yale University , New Haven , Connecticut 06520 , United States
| | - Catherine F Wise
- Department of Chemistry , Yale University , New Haven , Connecticut 06520 , United States
| | - Daniel J Martin
- Department of Chemistry , Yale University , New Haven , Connecticut 06520 , United States
| | - James M Mayer
- Department of Chemistry , Yale University , New Haven , Connecticut 06520 , United States
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23
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Gani TZH, Kulik HJ. Understanding and Breaking Scaling Relations in Single-Site Catalysis: Methane to Methanol Conversion by FeIV═O. ACS Catal 2018. [DOI: 10.1021/acscatal.7b03597] [Citation(s) in RCA: 93] [Impact Index Per Article: 15.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Terry Z. H. Gani
- Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
| | - Heather J. Kulik
- Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
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24
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Gordon Z, Drummond MJ, Matson EM, Bogart JA, Schelter EJ, Lord RL, Fout AR. Tuning the Fe(II/III) Redox Potential in Nonheme Fe(II)-Hydroxo Complexes through Primary and Secondary Coordination Sphere Modifications. Inorg Chem 2017; 56:4852-4863. [PMID: 28394119 DOI: 10.1021/acs.inorgchem.6b03071] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
The derivatization of the imino-functionalized tris(pyrrolylmethyl)amine ligand framework, N(XpiR)3 (XLR; X = H, Br; R = cyclohexyl (Cy), phenyl (Ph), 2,6- diisopropylphenyl (DIPP)), is reported. Modular ligand synthesis allows for facile modification of both the primary and secondary coordination sphere electronics. The iron(II)-hydroxo complexes, N(XpiR)(XafaR)2Fe(II)OH (XLRFeIIOH), are synthesized to establish the impact of the ligand modifications on the complexes' electronic properties, including their chemical and electrochemical oxidation. Cyclic voltammetry demonstrates that the Fe(II/III) redox couple spans a 400 mV range across the series. The origin of the shifted potential is explained based on spectroscopic, structural, and theoretical analyses of the iron(II) and iron(III) compounds.
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Affiliation(s)
- Zachary Gordon
- Department of Chemistry, University of Illinois at Urbana-Champaign , 600 South Mathews Avenue, Urbana, Illinois 61801, United States
| | - Michael J Drummond
- Department of Chemistry, University of Illinois at Urbana-Champaign , 600 South Mathews Avenue, Urbana, Illinois 61801, United States
| | - Ellen M Matson
- Department of Chemistry, University of Illinois at Urbana-Champaign , 600 South Mathews Avenue, Urbana, Illinois 61801, United States
| | - Justin A Bogart
- P. Roy and Diana T. Vagelos Laboratories, Department of Chemistry, University of Pennsylvania , 231 South 34 Street, Philadelphia, Pennsylvania 19104, United States
| | - Eric J Schelter
- P. Roy and Diana T. Vagelos Laboratories, Department of Chemistry, University of Pennsylvania , 231 South 34 Street, Philadelphia, Pennsylvania 19104, United States
| | - Richard L Lord
- Department of Chemistry, Grand Valley State University , 1 Campus Drive, Allendale, Michigan 49401, United States
| | - Alison R Fout
- Department of Chemistry, University of Illinois at Urbana-Champaign , 600 South Mathews Avenue, Urbana, Illinois 61801, United States
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25
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Jones JR, Ziller JW, Borovik AS. Modulating the Primary and Secondary Coordination Spheres within a Series of Co II-OH Complexes. Inorg Chem 2017; 56:1112-1120. [PMID: 28094522 DOI: 10.1021/acs.inorgchem.6b01956] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
The interplay between the primary and secondary coordination spheres is crucial to determining the properties of transition metal complexes. To examine these effects, a series of trigonal bipyramidal Co-OH complexes have been prepared with tripodal ligands that control both coordination spheres. The ligands contain a combination of either urea or sulfonamide groups that control the primary coordination sphere through anionic donors in the trigonal plane and the secondary coordination sphere through intramolecular hydrogen bonds. Variations in the anion donor strengths were evaluated using electronic absorbance spectroscopy and a qualitative ligand field analysis to find that deprotonated urea donors are stronger field ligands than deprotonated sulfonamides. Structural variations were found in the CoII-O bond lengths that range from 1.953(4) to 2.051(3) Å; this range in bond lengths were attributed to the differences in the intramolecular hydrogen bonds that surround the hydroxido ligand. A similar trend was observed between the hydrogen bonding networks and the vibrations of the O-H bonds. Attempts to isolate the corresponding CoIII-OH complexes were hampered by their instability at room temperature.
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Affiliation(s)
- Jason R Jones
- Department of Chemistry, University of California-Irvine , 1102 Natural Sciences II, Irvine, California 92697-2025, United States
| | - Joseph W Ziller
- Department of Chemistry, University of California-Irvine , 1102 Natural Sciences II, Irvine, California 92697-2025, United States
| | - A S Borovik
- Department of Chemistry, University of California-Irvine , 1102 Natural Sciences II, Irvine, California 92697-2025, United States
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26
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Khan FST, Pandey AK, Rath SP. Remarkable Anion-Dependent Spin-State Switching in Diiron(III) μ-Hydroxo Bisporphyrins: What Role do Counterions Play? Chemistry 2016; 22:16124-16137. [PMID: 27682429 DOI: 10.1002/chem.201603163] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2016] [Indexed: 12/20/2022]
Abstract
Addition of 2,4,6-trinitrophenol (HTNP) to an ethene-bridged diiron(III) μ-oxo bisporphyrin (1) in CH2 Cl2 initially leads to the formation of diiron(III) μ-hydroxo bisporphyrin (2⋅TNP) with a phenolate counterion that, after further addition of HTNP or dissolution in a nonpolar solvent, converts to a diiron(III) complex with axial phenoxide coordination (3⋅(TNP)2 ). The progress of the reaction from μ-oxo to μ-hydroxo to axially ligated complex has been monitored in solution by using 1 H NMR spectroscopy because their signals appear in three different and distinct spectral regions. The X-ray structure of 2⋅TNP revealed that the nearly planar TNP counterion fits perfectly within the bisporphyrin cavity to form a strong hydrogen bond with the μ-hydroxo group, which thus stabilizes the two equivalent iron centers. In contrast, such counterions as I5 , I3 , BF4 , SbF6 , and PF6 are found to be tightly associated with one of the porphyrin rings and, therefore, stabilize two different spin states of iron in one molecule. A spectroscopic investigation of 2⋅TNP has revealed the presence of two equivalent iron centers with a high-spin state (S=5/2) in the solid state that converts to intermediate spin (S=3/2) in solution. An extensive computational study by using a range of DFT methods was performed on 2⋅TNP and 2+ , and clearly supports the experimentally observed spin flip triggered by hydrogen-bonding interactions. The counterion is shown to perturb the spin-state ordering through, for example, hydrogen-bonding interactions, switched positions between counterion and axial ligand, ion-pair interactions, and charge polarization. The present investigation thus provides a clear rationalization of the unusual counterion-specific spin states observed in the μ-hydroxo bisporphyrins that have so far remained the most outstanding issue.
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Affiliation(s)
| | - Anjani Kumar Pandey
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur, 208016, India
| | - Sankar Prasad Rath
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur, 208016, India.
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27
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Dahl EW, Szymczak NK. Hydrogen Bonds Dictate the Coordination Geometry of Copper: Characterization of a Square-Planar Copper(I) Complex. Angew Chem Int Ed Engl 2016; 55:3101-5. [PMID: 26822857 PMCID: PMC4804195 DOI: 10.1002/anie.201511527] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2015] [Indexed: 12/31/2022]
Abstract
6,6''-Bis(2,4,6-trimethylanilido)terpyridine (H2Tpy(NMes)) was prepared as a rigid, tridentate pincer ligand containing pendent anilines as hydrogen bond donor groups in the secondary coordination sphere. The coordination geometry of (H2 Tpy(NMes))copper(I)-halide (Cl, Br and I) complexes is dictated by the strength of the NH-halide hydrogen bond. The Cu(I)Cl and Cu(II)Cl complexes are nearly isostructural, the former presenting a highly unusual square-planar geometry about Cu(I) . The geometric constraints provided by secondary interactions are reminiscent of blue copper proteins where a constrained geometry, or entatic state, allows for extremely rapid Cu(I)/Cu(II) electron-transfer self-exchange rates. Cu(H2 Tpy(NMes))Cl shows similar fast electron transfer (≈10(5) m(-1) s(-1)) which is the same order of magnitude as biological systems.
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Affiliation(s)
- Eric W Dahl
- Department of Chemistry, University of Michigan, 930 N. University, Ann Arbor, MI, 48109, USA
| | - Nathaniel K Szymczak
- Department of Chemistry, University of Michigan, 930 N. University, Ann Arbor, MI, 48109, USA.
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28
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Dahl EW, Szymczak NK. Hydrogen Bonds Dictate the Coordination Geometry of Copper: Characterization of a Square‐Planar Copper(I) Complex. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201511527] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Eric W. Dahl
- Department of Chemistry University of Michigan 930 N. University Ann Arbor MI 48109 USA
| | - Nathaniel K. Szymczak
- Department of Chemistry University of Michigan 930 N. University Ann Arbor MI 48109 USA
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29
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Lamb AC, Wang Z, Cook TM, Sharma B, Chen SJ, Lu Z, Steren CA, Lin Z, Xue ZL. Preparation of all N-coordinated zirconium amide amidinates and studies of their reactions with dioxygen and water. Polyhedron 2016. [DOI: 10.1016/j.poly.2015.07.045] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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30
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Cook SA, Borovik AS. Molecular designs for controlling the local environments around metal ions. Acc Chem Res 2015; 48:2407-14. [PMID: 26181849 DOI: 10.1021/acs.accounts.5b00212] [Citation(s) in RCA: 232] [Impact Index Per Article: 25.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
The functions of metal complexes are directly linked to the local environment in which they are housed; modifications to the local environment (or secondary coordination sphere) are known to produce changes in key properties of the metal centers that can affect reactivity. Noncovalent interactions are the most common and influential forces that regulate the properties of secondary coordination spheres, which leads to complexities in structure that are often difficult to achieve in synthetic systems. Using key architectural features from the active sites of metalloproteins as inspiration, we have developed molecular systems that enforce intramolecular hydrogen bonds (H-bonds) around a metal center via incorporation of H-bond donors and acceptors into rigid ligand scaffolds. We have utilized these molecular species to probe mechanistic aspects of biological dioxygen activation and water oxidation. This Account describes the stabilization and characterization of unusual M-oxo and heterobimetallic complexes. These types of species have been implicated in a range of oxidative processes in biology but are often difficult to study because of their inherent reactivity. Our H-bonding ligand systems allowed us to prepare an Fe(III)-oxo species directly from the activation of O2 that was subsequently oxidized to form a monomeric Fe(IV)-oxo species with an S = 2 spin state, similar to those species proposed as key intermediates in non-heme monooxygenases. We also demonstrated that a single Mn(III)-oxo center that was prepared from water could be converted to a high-spin Mn(V)-oxo species via stepwise oxidation, a process that mimics the oxidative charging of the oxygen-evolving complex (OEC) of photosystem II. Current mechanisms for photosynthetic O-O bond formation invoke a Mn(IV)-oxyl species rather than the isoelectronic Mn(V)-oxo system as the key oxidant based on computational studies. However, there is no experimental information to support the existence of a Mn-oxyl radical. We therefore probed the amount of spin density on the oxido ligand of our complexes using EPR spectroscopy in conjunction with oxygen-17 labeling. Our findings showed that there is a significant amount of spin on the oxido ligand, yet the M-oxo bonds are best described as highly covalent and there is no indication that an oxyl radical is formed. These results offer the intriguing possibility that high-spin M-oxo complexes are involved in O-O bond formation in biology. Ligand redesign to incorporate H-bond accepting units (sulfonamido groups) simultaneously provided a metal ion binding pocket, adjacent H-bond acceptors, and an auxiliary binding site for a second metal ion. These properties allowed us to isolate a series of heterobimetallic complexes of Fe(III) and Mn(III) in which a group II metal ion was coordinated within the secondary coordination sphere. Examination of the influence of the second metal ion on the electron transfer properties of the primary metal center revealed unexpected similarities between Ca(II) and Sr(II) ions, a result with relevance to the OEC. In addition, the presence of a second metal ion was found to prevent intramolecular oxidation of the ligand with an O atom transfer reagent.
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Affiliation(s)
- Sarah A. Cook
- Department
of Chemistry, University of California—Irvine, 1102 Natural Sciences II, Irvine, California 92697, United States
| | - A. S. Borovik
- Department
of Chemistry, University of California—Irvine, 1102 Natural Sciences II, Irvine, California 92697, United States
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31
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Sahoo D, Quesne MG, de Visser SP, Rath SP. Hydrogen-Bonding Interactions Trigger a Spin-Flip in Iron(III) Porphyrin Complexes. ANGEWANDTE CHEMIE (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2015; 127:4878-4882. [PMID: 26109743 PMCID: PMC4470476 DOI: 10.1002/ange.201411399] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/25/2014] [Indexed: 11/16/2022]
Abstract
A key step in cytochrome P450 catalysis includes the spin-state crossing from low spin to high spin upon substrate binding and subsequent reduction of the heme. Clearly, a weak perturbation in P450 enzymes triggers a spin-state crossing. However, the origin of the process whereby enzymes reorganize their active site through external perturbations, such as hydrogen bonding, is still poorly understood. We have thus studied the impact of hydrogen-bonding interactions on the electronic structure of a five-coordinate iron(III) octaethyltetraarylporphyrin chloride. The spin state of the metal was found to switch reversibly between high (S=5/2) and intermediate spin (S=3/2) with hydrogen bonding. Our study highlights the possible effects and importance of hydrogen-bonding interactions in heme proteins. This is the first example of a synthetic iron(III) complex that can reversibly change its spin state between a high and an intermediate state through weak external perturbations.
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Affiliation(s)
- Dipankar Sahoo
- Department of Chemistry, Indian Institute of Technology KanpurKanpur-208016 (India)
- Manchester Institute of Biotechnology and School of Chemical Engineering and Analytical Science, The University of Manchester131 Princess Street, Manchester M1 7DN (UK)
| | - Matthew G Quesne
- Department of Chemistry, Indian Institute of Technology KanpurKanpur-208016 (India)
- Manchester Institute of Biotechnology and School of Chemical Engineering and Analytical Science, The University of Manchester131 Princess Street, Manchester M1 7DN (UK)
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32
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Guillet GL, Gordon JB, Di Francesco GN, Calkins MW, Čižmár E, Abboud KA, Meisel MW, García-Serres R, Murray LJ. A Family of Tri- and Dimetallic Pyridine Dicarboxamide Cryptates: Unusual O,N,O-Coordination and Facile Access to Secondary Coordination Sphere Hydrogen Bonding Interactions. Inorg Chem 2015; 54:2691-704. [DOI: 10.1021/ic502873d] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Gary L. Guillet
- Center for Catalysis, Department of Chemistry, University of Florida, Gainesville, Florida 32611-7200, United States
| | - Jesse B. Gordon
- Center for Catalysis, Department of Chemistry, University of Florida, Gainesville, Florida 32611-7200, United States
| | - Gianna N. Di Francesco
- Center for Catalysis, Department of Chemistry, University of Florida, Gainesville, Florida 32611-7200, United States
| | - Matthew W. Calkins
- Department
of Physics and the National High Magnetic Field Laboratory, University of Florida, Gainesville, Florida 32611-8440, United States
| | - Erik Čižmár
- Institute
of Physics, Faculty of Science, P.J. Šafárik University, 04154 Košice, Slovakia
| | - Khalil A. Abboud
- Center for Catalysis, Department of Chemistry, University of Florida, Gainesville, Florida 32611-7200, United States
| | - Mark W. Meisel
- Department
of Physics and the National High Magnetic Field Laboratory, University of Florida, Gainesville, Florida 32611-8440, United States
| | - Ricardo García-Serres
- Laboratoire
de Chimie de Biologie des Métaux, UMR 5249, Université Joseph Fourier, Grenoble-1, CNRS-CEA, 17 Rue des Martyrs, 38054 Grenoble Cedex 9, France
| | - Leslie J. Murray
- Center for Catalysis, Department of Chemistry, University of Florida, Gainesville, Florida 32611-7200, United States
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33
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Sahoo D, Quesne MG, de Visser SP, Rath SP. Hydrogen-bonding interactions trigger a spin-flip in iron(III) porphyrin complexes. Angew Chem Int Ed Engl 2015; 54:4796-800. [PMID: 25645603 PMCID: PMC4687417 DOI: 10.1002/anie.201411399] [Citation(s) in RCA: 71] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2014] [Indexed: 12/03/2022]
Abstract
A key step in cytochrome P450 catalysis includes the spin-state crossing from low spin to high spin upon substrate binding and subsequent reduction of the heme. Clearly, a weak perturbation in P450 enzymes triggers a spin-state crossing. However, the origin of the process whereby enzymes reorganize their active site through external perturbations, such as hydrogen bonding, is still poorly understood. We have thus studied the impact of hydrogen-bonding interactions on the electronic structure of a five-coordinate iron(III) octaethyltetraarylporphyrin chloride. The spin state of the metal was found to switch reversibly between high (S=5/2) and intermediate spin (S=3/2) with hydrogen bonding. Our study highlights the possible effects and importance of hydrogen-bonding interactions in heme proteins. This is the first example of a synthetic iron(III) complex that can reversibly change its spin state between a high and an intermediate state through weak external perturbations.
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Affiliation(s)
- Dipankar Sahoo
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur-208016 (India)
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34
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Marshall-Roth T, Brown SN. Redox activity and π bonding in a tripodal seven-coordinate molybdenum(vi) tris(amidophenolate). Dalton Trans 2015; 44:677-85. [DOI: 10.1039/c4dt02936d] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A tripodal seven-coordinate tris(amidophenolato)molybdenum(vi) complex shows strong ligand-to-metal π donation (40 kcal mol−1 per π bond) and undergoes facile ligand-centered oxidation.
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Affiliation(s)
| | - Seth N. Brown
- Department of Chemistry and Biochemistry
- University of Notre Dame
- Notre Dame
- USA
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35
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Matson EM, Park YJ, Bertke JA, Fout AR. Synthesis and characterization of M(ii) (M = Mn, Fe and Co) azafulvene complexes and their X3− derivatives. Dalton Trans 2015; 44:10377-84. [DOI: 10.1039/c5dt00985e] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Structural and electronic flexibility in a tripodal ligand platform featuring a secondary coordination sphere.
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Affiliation(s)
- Ellen M. Matson
- School of Chemical Sciences
- University of Illinois at Urbana-Champaign
- Urbana
- USA
| | - Yun Ji Park
- School of Chemical Sciences
- University of Illinois at Urbana-Champaign
- Urbana
- USA
| | - Jeffery A. Bertke
- School of Chemical Sciences
- University of Illinois at Urbana-Champaign
- Urbana
- USA
| | - Alison R. Fout
- School of Chemical Sciences
- University of Illinois at Urbana-Champaign
- Urbana
- USA
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36
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Park YJ, Matson EM, Nilges MJ, Fout AR. Exploring Mn–O bonding in the context of an electronically flexible secondary coordination sphere: synthesis of a Mn(iii)–oxo. Chem Commun (Camb) 2015; 51:5310-3. [DOI: 10.1039/c4cc08603a] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Stabilization of Mn–O bonds by hydrogen-bond donating and accepting secondary coordination sphere.
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Affiliation(s)
- Yun Ji Park
- School of Chemical Sciences
- University of Illinois at Urbana-Champaign
- Urbana
- USA
| | - Ellen M. Matson
- School of Chemical Sciences
- University of Illinois at Urbana-Champaign
- Urbana
- USA
| | - Mark J. Nilges
- School of Chemical Sciences
- University of Illinois at Urbana-Champaign
- Urbana
- USA
| | - Alison R. Fout
- School of Chemical Sciences
- University of Illinois at Urbana-Champaign
- Urbana
- USA
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37
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38
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Blacquiere JM, Pegis ML, Raugei S, Kaminsky W, Forget A, Cook SA, Taguchi T, Mayer JM. Synthesis and Reactivity of Tripodal Complexes Containing Pendant Bases. Inorg Chem 2014; 53:9242-53. [DOI: 10.1021/ic5013389] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Johanna M. Blacquiere
- Department of Chemistry, University of Washington, Box 351700, Seattle, Washington 98195-1700, United States
- Department of Chemistry, University of Western Ontario, London, Ontario N6A 5B7, Canada
| | - Michael L. Pegis
- Department of Chemistry, University of Washington, Box 351700, Seattle, Washington 98195-1700, United States
| | - Simone Raugei
- Physical Sciences Division, Pacific Northwest National Laboratory, P.O. Box 999, K2-57, Richland, Washington 99352, United States
| | - Werner Kaminsky
- Department of Chemistry, University of Washington, Box 351700, Seattle, Washington 98195-1700, United States
| | - Amélie Forget
- Department of Chemistry, University of Washington, Box 351700, Seattle, Washington 98195-1700, United States
| | - Sarah A. Cook
- Department
of Chemistry, University of California—Irvine, 1102 Natural Sciences II, Irvine, California 92697, United States
| | - Taketo Taguchi
- Department
of Chemistry, University of California—Irvine, 1102 Natural Sciences II, Irvine, California 92697, United States
| | - James M. Mayer
- Department of Chemistry, University of Washington, Box 351700, Seattle, Washington 98195-1700, United States
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39
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Lamb AC, Lu Z, Xue ZL. Reactions of zirconium amide amidinates with dioxygen. Observation of an unusual peroxo intermediate in the formation of oxo compounds. Chem Commun (Camb) 2014; 50:10517-20. [DOI: 10.1039/c4cc04032e] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
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40
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Matson EM, Bertke JA, Fout AR. Isolation of Iron(II) Aqua and Hydroxyl Complexes Featuring a Tripodal H-bond Donor and Acceptor Ligand. Inorg Chem 2014; 53:4450-8. [DOI: 10.1021/ic500102c] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Affiliation(s)
- Ellen M. Matson
- School
of Chemical Sciences, University of Illinois at Urbana−Champaign, 600 S. Mathews Avenue Urbana, Illinois 61801, United States
| | - Jeffrey A. Bertke
- School
of Chemical Sciences, University of Illinois at Urbana−Champaign, 600 S. Mathews Avenue Urbana, Illinois 61801, United States
| | - Alison R. Fout
- School
of Chemical Sciences, University of Illinois at Urbana−Champaign, 600 S. Mathews Avenue Urbana, Illinois 61801, United States
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41
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Moore CM, Quist DA, Kampf JW, Szymczak NK. A 3-Fold-Symmetric Ligand Based on 2-Hydroxypyridine: Regulation of Ligand Binding by Hydrogen Bonding. Inorg Chem 2014; 53:3278-80. [DOI: 10.1021/ic5003594] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Cameron M. Moore
- Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109, United States
| | - David A. Quist
- Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109, United States
| | - Jeff W. Kampf
- Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109, United States
| | - Nathaniel K. Szymczak
- Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109, United States
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42
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Babahan I, Engle JT, Kumar N, Ziegler CJ, Jia L. Coordination chemistry of bidentate phosphine ligands with hydrogen-bonding arms: Picket-fence rhodium complexes. Polyhedron 2014. [DOI: 10.1016/j.poly.2013.11.018] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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43
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Bansal D, Kumar G, Hundal G, Gupta R. Mononuclear complexes of amide-based ligands containing appended functional groups: role of secondary coordination spheres on catalysis. Dalton Trans 2014; 43:14865-75. [DOI: 10.1039/c4dt02079k] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
Coordination complexes of amide-based ligands with appended heterocyclic rings create a hydrogen bonding cavity that effectively binds the substrate(s). Such cavity-based complexes function as reusable and heterogeneous catalysts for various organic transformations.
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Affiliation(s)
- Deepak Bansal
- Department of Chemistry
- University of Delhi
- Delhi-110007, India
| | - Gulshan Kumar
- Department of Chemistry
- University of Delhi
- Delhi-110007, India
| | | | - Rajeev Gupta
- Department of Chemistry
- University of Delhi
- Delhi-110007, India
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44
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Usharani D, Lacy DC, Borovik AS, Shaik S. Dichotomous hydrogen atom transfer vs proton-coupled electron transfer during activation of X-H bonds (X = C, N, O) by nonheme iron-oxo complexes of variable basicity. J Am Chem Soc 2013; 135:17090-104. [PMID: 24124906 PMCID: PMC3876471 DOI: 10.1021/ja408073m] [Citation(s) in RCA: 191] [Impact Index Per Article: 17.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
We describe herein the hydrogen-atom transfer (HAT)/proton-coupled electron-transfer (PCET) reactivity for Fe(IV)-oxo and Fe(III)-oxo complexes (1-4) that activate C-H, N-H, and O-H bonds in 9,10-dihydroanthracene (S1), dimethylformamide (S2), 1,2-diphenylhydrazine (S3), p-methoxyphenol (S4), and 1,4-cyclohexadiene (S5). In 1-3, the iron is pentacoordinated by tris[N'-tert-butylureaylato)-N-ethylene]aminato ([H3buea](3-)) or its derivatives. These complexes are basic, in the order 3 ≫ 1 > 2. Oxidant 4, [Fe(IV)N4Py(O)](2+) (N4Py: N,N-bis(2-pyridylmethyl)bis(2-pyridyl)methylamine), is the least basic oxidant. The DFT results match experimental trends and exhibit a mechanistic spectrum ranging from concerted HAT and PCET reactions to concerted-asynchronous proton transfer (PT)/electron transfer (ET) mechanisms, all the way to PT. The singly occupied orbital along the O···H···X (X = C, N, O) moiety in the TS shows clearly that in the PCET cases, the electron is transferred separately from the proton. The Bell-Evans-Polanyi principle does not account for the observed reactivity pattern, as evidenced by the scatter in the plot of calculated barrier vs reactions driving forces. However, a plot of the deformation energy in the TS vs the respective barrier provides a clear signature of the HAT/PCET dichotomy. Thus, in all C-H bond activations, the barrier derives from the deformation energy required to create the TS, whereas in N-H/O-H bond activations, the deformation energy is much larger than the corresponding barrier, indicating the presence of a stabilizing interaction between the TS fragments. A valence bond model is used to link the observed results with the basicity/acidity of the reactants.
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Affiliation(s)
- Dandamudi Usharani
- Institute of Chemistry and the Lise-Meitner-Minerva Center for Computational Quantum Chemistry, The Hebrew University of Jerusalem, 91904 Jerusalem, Israel
| | - David C. Lacy
- Department of Chemistry, University of California-Irvine, 1102 Natural Sciences II, Irvine, California 92697, United States
| | - A. S. Borovik
- Department of Chemistry, University of California-Irvine, 1102 Natural Sciences II, Irvine, California 92697, United States
| | - Sason Shaik
- Institute of Chemistry and the Lise-Meitner-Minerva Center for Computational Quantum Chemistry, The Hebrew University of Jerusalem, 91904 Jerusalem, Israel
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45
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Sharma B, Callaway TM, Lamb AC, Steren CA, Chen SJ, Xue ZL. Reactions of Group 4 Amide Guanidinates with Dioxygen or Water. Studies of the Formation of Oxo Products. Inorg Chem 2013; 52:11409-21. [DOI: 10.1021/ic4016965] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Affiliation(s)
- Bhavna Sharma
- Department
of Chemistry, The University of Tennessee, Knoxville, Tennessee 37996, United States
| | - Tabitha M. Callaway
- Department
of Chemistry, The University of Tennessee, Knoxville, Tennessee 37996, United States
| | - Adam C. Lamb
- Department
of Chemistry, The University of Tennessee, Knoxville, Tennessee 37996, United States
| | - Carlos A. Steren
- Department
of Chemistry, The University of Tennessee, Knoxville, Tennessee 37996, United States
| | - Shu-Jian Chen
- Department
of Chemistry, The University of Tennessee, Knoxville, Tennessee 37996, United States
| | - Zi-Ling Xue
- Department
of Chemistry, The University of Tennessee, Knoxville, Tennessee 37996, United States
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46
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Lacy DC, Mukherjee J, Lucas RL, Day VW, Borovik A. Metal complexes with varying intramolecular hydrogen bonding networks. Polyhedron 2013; 52:261-267. [PMID: 24904193 PMCID: PMC4043334 DOI: 10.1016/j.poly.2012.09.034] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
Alfred Werner described the attributes of the primary and secondary coordination spheres in his development of coordination chemistry. To examine the effects of the secondary coordination sphere on coordination chemistry, a series of tripodal ligands containing differing numbers of hydrogen bond (H-bond) donors were used to examine the effects of H-bonds on Fe(II), Mn(II)-acetato, and Mn(III)-OH complexes. The ligands containing varying numbers of urea and amidate donors allowed for systematic changes in the secondary coordination spheres of the complexes. Two of the Fe(II) complexes that were isolated as their Bu4N+ salts formed dimers in the solid-state as determined by X-ray diffraction methods, which correlates with the number of H-bonds present in the complexes (i.e., dimerization is favored as the number of H-bond donors increases). Electron paramagnetic resonance (EPR) studies suggested that the dimeric structures persist in acetonitrile. The Mn(II) complexes were all isolated as their acetato adducts. Furthermore, the synthesis of a rare Mn(III)-OH complex via dioxygen activation was achieved that contains a single intramolecular H-bond; its physical properties are discussed within the context of other Mn(III)-OH complexes.
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Affiliation(s)
- David C. Lacy
- Department of Chemistry, University of California-Irvine, 1102 Natural Sciences II, Irvine, CA 92697, United States
| | - Jhumpa Mukherjee
- Department of Chemistry, University of California-Irvine, 1102 Natural Sciences II, Irvine, CA 92697, United States
| | - Robie L. Lucas
- Department of Chemistry, University of Kansas, Lawrence, KS 66045, United States
| | - Victor W. Day
- Department of Chemistry, University of Kansas, Lawrence, KS 66045, United States
| | - A.S. Borovik
- Department of Chemistry, University of California-Irvine, 1102 Natural Sciences II, Irvine, CA 92697, United States
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47
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Sengupta K, Chatterjee S, Samanta S, Bandyopadhyay S, Dey A. Resonance Raman and Electrocatalytic Behavior of Thiolate and Imidazole Bound Iron Porphyrin Complexes on Self Assembled Monolayers: Functional Modeling of Cytochrome P450. Inorg Chem 2013; 52:2000-14. [DOI: 10.1021/ic302369v] [Citation(s) in RCA: 59] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Kushal Sengupta
- Department of Inorganic Chemistry, Indian Association for the Cultivation of Science,
Kolkata, India 700032
| | - Sudipta Chatterjee
- Department of Inorganic Chemistry, Indian Association for the Cultivation of Science,
Kolkata, India 700032
| | - Subhra Samanta
- Department of Inorganic Chemistry, Indian Association for the Cultivation of Science,
Kolkata, India 700032
| | - Sabyasachi Bandyopadhyay
- Department of Inorganic Chemistry, Indian Association for the Cultivation of Science,
Kolkata, India 700032
| | - Abhishek Dey
- Department of Inorganic Chemistry, Indian Association for the Cultivation of Science,
Kolkata, India 700032
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48
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Thorseth MA, Tornow CE, Tse EC, Gewirth AA. Cu complexes that catalyze the oxygen reduction reaction. Coord Chem Rev 2013. [DOI: 10.1016/j.ccr.2012.03.033] [Citation(s) in RCA: 120] [Impact Index Per Article: 10.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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49
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Wilson TD, Yu Y, Lu Y. Understanding copper-thiolate containing electron transfer centers by incorporation of unnatural amino acids and the CuA center into the type 1 copper protein azurin. Coord Chem Rev 2013. [DOI: 10.1016/j.ccr.2012.06.015] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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50
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Thorseth MA, Letko CS, Tse ECM, Rauchfuss TB, Gewirth AA. Ligand Effects on the Overpotential for Dioxygen Reduction by Tris(2-pyridylmethyl)amine Derivatives. Inorg Chem 2012; 52:628-34. [DOI: 10.1021/ic301656x] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Matthew A. Thorseth
- Department of Chemistry, University of Illinois at Urbana−Champaign,
600 S. Mathews Avenue, Urbana, Illinois 61801, United States
| | - Christopher S. Letko
- Department of Chemistry, University of Illinois at Urbana−Champaign,
600 S. Mathews Avenue, Urbana, Illinois 61801, United States
| | - Edmund C. M. Tse
- Department of Chemistry, University of Illinois at Urbana−Champaign,
600 S. Mathews Avenue, Urbana, Illinois 61801, United States
| | - Thomas B. Rauchfuss
- Department of Chemistry, University of Illinois at Urbana−Champaign,
600 S. Mathews Avenue, Urbana, Illinois 61801, United States
| | - Andrew A. Gewirth
- Department of Chemistry, University of Illinois at Urbana−Champaign,
600 S. Mathews Avenue, Urbana, Illinois 61801, United States
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