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Biswas M, Dey S, Das A, Kanti Paine T, Panda S, Kumar Lahiri G. Dioxygen Activation by Redox-Active Bis(aldimine) Ligand Bridged Diruthenium Complex Possessing Singlet Ground State. Chemistry 2022; 28:e202202088. [PMID: 35947006 DOI: 10.1002/chem.202202088] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2022] [Indexed: 01/08/2023]
Abstract
The unexplored 'actor' behavior of redox-active bis(aldimine) congener, p-phenylene-bis(picoline)aldimine (L1), towards dioxygen activation and subsequent functionalization of its backbone was demonstrated on coordination with {Ru(acac)2 } (acac= acetylacetonate). Reaction under aerobic condition led to the one-pot generation of dinuclear complexes with unperturbed L1, imino-carboxamido (L2- ), and bis(carboxamido) (L32- )-bridged isovalent {RuII (μ-L1)RuII }, 1/ {RuIII (μ-L32- )RuIII }, 3 and mixed-valent {RuII (μ-L2- )RuIII }, 2. Authentication of the complexes along with the redox non-innocence behavior of their bridge have been validated through structure, spectroelectrochemistry and DFT calculations. Kinetic and isotope labelling experiments together with DFT analyzed transition states justified the consideration of redox shuttling at metal/L1 interface for 3 O2 activation despite of the closed shell configuration of 1 (S=0) to give carboxamido derived 2/3.
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Affiliation(s)
- Mitrali Biswas
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai, 400076, India
| | - Sanchaita Dey
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai, 400076, India
| | - Abhishek Das
- School of Chemical Sciences, Indian Association for the Cultivation of Science, Jadavpur, Kolkata, 700032, India
| | - Tapan Kanti Paine
- School of Chemical Sciences, Indian Association for the Cultivation of Science, Jadavpur, Kolkata, 700032, India
| | - Sanjib Panda
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai, 400076, India
| | - Goutam Kumar Lahiri
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai, 400076, India
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2
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Daya VP, Jagan R, Chand DK. Self-assembled discrete and polymeric cobalt(II) complexes of a carboxylate appended tripodal tetradentate ligand: reactivity with aerial dioxygen or aqueous hydrogen peroxide. J CHEM SCI 2022. [DOI: 10.1007/s12039-022-02049-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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3
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Nikolaevskaya E, Druzhkov N, Syroeshkin M, Egorov M. Chemistry of diazadiene type ligands with extra coordination groups. Prospects of reactivity. Coord Chem Rev 2020. [DOI: 10.1016/j.ccr.2020.213353] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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4
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Inoue S, Yan YN, Yamanishi K, Kataoka Y, Kawamoto T. Photocatalytic and electrocatalytic hydrogen production using nickel complexes supported by hemilabile and non-innocent ligands. Chem Commun (Camb) 2020; 56:2829-2832. [PMID: 32073053 DOI: 10.1039/c9cc09568c] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Nickel complexes with non-innocent ligands generated by one-electron reduction of octahedral Schiff base nickel(ii) complexes with hemilabile ligands exhibited excellent catalytic activities of over 5000 TONs through a metal-ligand cooperation mechanism for hydrogen evolution from water under visible light irradiation.
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Affiliation(s)
- Satoshi Inoue
- Department of Chemistry, Faculty of Science, Kanagawa University, 2946 Tsuchiya, Hiratsuka, 259-1293, Japan.
| | - Yin-Nan Yan
- Department of Chemistry, Faculty of Science, Kanagawa University, 2946 Tsuchiya, Hiratsuka, 259-1293, Japan.
| | - Katsunori Yamanishi
- Department of Chemistry, Faculty of Science, Kanagawa University, 2946 Tsuchiya, Hiratsuka, 259-1293, Japan.
| | - Yusuke Kataoka
- Department of Chemistry, Graduate School of Natural Science and Technology, Shimane University, 1060 Nishikawatsu, Matsue, 690-8504, Japan
| | - Tatsuya Kawamoto
- Department of Chemistry, Faculty of Science, Kanagawa University, 2946 Tsuchiya, Hiratsuka, 259-1293, Japan.
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Alaji Z, Safaei E, Yi H, Cong H, Wojtczak A, Lei A. Redox active ligand and metal cooperation for C(sp 2)-H oxidation: extension of the galactose oxidase mechanism in water-mediated amide formation. Dalton Trans 2018; 47:15293-15297. [PMID: 30325380 DOI: 10.1039/c8dt03477j] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
Redox interplay between a ligand and a metal can provide a profound driving force for the promotion of unprecedented reactions. This work presents an intriguing water-assisted oxidative transformation of imine to amide with no formal change in the metal oxidation state in the copper and nickel complexes of an aminophenol ligand versus a zinc analogue.
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Affiliation(s)
- Zahra Alaji
- Institute for Advanced Studies in Basic Sciences (IASBS), 45137-66731, Zanjan, Iran
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6
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Unprecedented oxidation of aldimine to carboxamido function during reactivity studies on ruthenium complex with acidified nitrite solution: Synthesis of ruthenium nitrosyl complex having {RuNO}6 moiety and photorelease of coordinated NO. J Organomet Chem 2018. [DOI: 10.1016/j.jorganchem.2018.02.010] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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7
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Yano T, Wasada-Tsutsui Y, Ikeda T, Shibayama T, Kajita Y, Inomata T, Funahashi Y, Ozawa T, Masuda H. Co(III) Complexes with N 2S 3-Type Ligands as Structural/Functional Models for the Isocyanide Hydrolysis Reaction Catalyzed by Nitrile Hydratase. Inorg Chem 2018; 57:4277-4290. [PMID: 29582997 DOI: 10.1021/acs.inorgchem.6b02324] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
It has been before reported that, in addition to hydration of nitriles, the Fe-type nitrile hydratase (NHase) also catalyzes the hydrolysis of tert-butylisocyanide ( tBuNC). In order to investigate the unique isocyanide hydrolysis by NHase, we prepared three related Co(III) model complexes, PPh4[Co(L)] (1), PPh4[Co(L-O3)] (2), and PPh4[Co(L-O4)] (3), where L is bis( N-(2-mercapto-2-methylpropionyl)aminopropyl)sulfide. The suffixes L-O3 and L-O4 indicate ligands with a sulfenate and a sulfinate and with two sulfinates, respectively, instead of the two thiolates of L. The X-ray analyses of 1 and 3 reveal trigonal bipyramidal and square pyramidal structures, respectively. Complex 2, however, has five-coordinate trigonal-bipyramidal geometry with η2-type S-O coordination by a sulfenyl group. Addition of tBuNC to 1, 2, and 3 induces an absorption spectral change as a result of formation of an octahedral Co(III) complex. This interpretation is also supported by the crystal structures of PPh4[Co(L-O4)( tBuNC)] (4) and (PPh4)2[Co(L-O4)(CN)] (5). A water molecule interacts with 3 but cannot be activated as reported previously, as demonstrated by the lack of absorption spectral change in the pH range of 5.5-10.2. Interestingly, the coordinated tBuNC is hydrolyzed by 2 and 3 at pH 10.2 to produce tBuNH2 and CO molecule, but 1 does not react. These findings provide strong evidence that hydrolysis of tBuNC by NHase proceeds not by activation of the coordinated water molecule but by coordination of the substrate. The mechanism of the hydrolysis reaction of tBuNC is explained with support provided by DFT calculations; a positively polarized C atom of tBuNC on the Co(III) center is nucleophilically attacked by a hydroxide anion activated through an interaction of the sulfenyl/sulfinyl oxygen with the nucleophile.
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Affiliation(s)
- Takuma Yano
- Department of Frontier Materials, Graduate School of Engineering , Nagoya Institute of Technology , Gokiso-cho, Showa-ku, Nagoya 466-8555 , Japan
| | - Yuko Wasada-Tsutsui
- Department of Frontier Materials, Graduate School of Engineering , Nagoya Institute of Technology , Gokiso-cho, Showa-ku, Nagoya 466-8555 , Japan
| | - Tomohiro Ikeda
- Department of Frontier Materials, Graduate School of Engineering , Nagoya Institute of Technology , Gokiso-cho, Showa-ku, Nagoya 466-8555 , Japan
| | - Tomonori Shibayama
- Department of Frontier Materials, Graduate School of Engineering , Nagoya Institute of Technology , Gokiso-cho, Showa-ku, Nagoya 466-8555 , Japan
| | - Yuji Kajita
- Department of Applied Chemistry, Graduate School of Engineering , Aichi Institute of Technology , Yakusa, Toyota 470-0392 , Japan
| | - Tomohiko Inomata
- Department of Frontier Materials, Graduate School of Engineering , Nagoya Institute of Technology , Gokiso-cho, Showa-ku, Nagoya 466-8555 , Japan
| | - Yasuhiro Funahashi
- Department of Chemistry, Graduate School of Science , Osaka University , Machikaneyama , Toyonaka, Osaka 560-0043 , Japan
| | - Tomohiro Ozawa
- Department of Frontier Materials, Graduate School of Engineering , Nagoya Institute of Technology , Gokiso-cho, Showa-ku, Nagoya 466-8555 , Japan
| | - Hideki Masuda
- Department of Frontier Materials, Graduate School of Engineering , Nagoya Institute of Technology , Gokiso-cho, Showa-ku, Nagoya 466-8555 , Japan
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8
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Nasser N, Fard MA, Boyle PD, Puddephatt RJ. Oxygen atom transfer to platinum(II): A 2-pyridyloxaziridine and a 2-pyridylnitrone as potential oxygen atom donors. J Organomet Chem 2018. [DOI: 10.1016/j.jorganchem.2017.12.043] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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9
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Jana M, Majumdar A. C–S Bond Cleavage, Redox Reactions, and Dioxygen Activation by Nonheme Dicobalt(II) Complexes. Inorg Chem 2017; 57:617-632. [DOI: 10.1021/acs.inorgchem.7b02432] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Manish Jana
- Department of Inorganic Chemistry, Indian Association for the Cultivation of Science, 2A & 2B Raja S. C. Mullick Road, Jadavpur, Kolkata 700032, India
| | - Amit Majumdar
- Department of Inorganic Chemistry, Indian Association for the Cultivation of Science, 2A & 2B Raja S. C. Mullick Road, Jadavpur, Kolkata 700032, India
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10
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Peters GM, Winegrad JB, Gau MR, Imler GH, Xu B, Ren S, Wayland BB, Zdilla MJ. Synthesis and Structure of 2,5-Bis[N-(2,6-mesityl)iminomethyl]pyrrolylcobalt(II): Evidence for One-Electron-Oxidized, Redox Noninnocent Ligand Behavior. Inorg Chem 2017; 56:3377-3385. [DOI: 10.1021/acs.inorgchem.6b02898] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Garvin M. Peters
- Department of Chemistry, Temple University, 1901 North 13th Street, Philadelphia, Pennsylvania 19122, United States
| | - Jacob B. Winegrad
- Department of Chemistry, Temple University, 1901 North 13th Street, Philadelphia, Pennsylvania 19122, United States
| | - Michael R. Gau
- Department of Chemistry, Temple University, 1901 North 13th Street, Philadelphia, Pennsylvania 19122, United States
| | - Gregory H. Imler
- Department of Chemistry, Temple University, 1901 North 13th Street, Philadelphia, Pennsylvania 19122, United States
| | - Beibei Xu
- Department of Chemistry, Temple University, 1901 North 13th Street, Philadelphia, Pennsylvania 19122, United States
| | - Shenqiang Ren
- Department of Chemistry, Temple University, 1901 North 13th Street, Philadelphia, Pennsylvania 19122, United States
| | - Bradford B. Wayland
- Department of Chemistry, Temple University, 1901 North 13th Street, Philadelphia, Pennsylvania 19122, United States
| | - Michael J. Zdilla
- Department of Chemistry, Temple University, 1901 North 13th Street, Philadelphia, Pennsylvania 19122, United States
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11
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Basu D, Mazumder S, Shi X, Baydoun H, Niklas J, Poluektov O, Schlegel HB, Verani CN. Ligand Transformations and Efficient Proton/Water Reduction with Cobalt Catalysts Based on Pentadentate Pyridine‐Rich Environments. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201409813] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Debashis Basu
- Department of Chemistry, Wayne State University, 5101 Cass Ave, Detroit, MI 48202 (USA) http://chem.wayne.edu/veranigroup/
| | - Shivnath Mazumder
- Department of Chemistry, Wayne State University, 5101 Cass Ave, Detroit, MI 48202 (USA) http://chem.wayne.edu/veranigroup/
| | - Xuetao Shi
- Department of Chemistry, Wayne State University, 5101 Cass Ave, Detroit, MI 48202 (USA) http://chem.wayne.edu/veranigroup/
| | - Habib Baydoun
- Department of Chemistry, Wayne State University, 5101 Cass Ave, Detroit, MI 48202 (USA) http://chem.wayne.edu/veranigroup/
| | - Jens Niklas
- Argonne National Laboratory, Chemistry Division, E117, 9700 South Cass Ave. Argonne, IL 60439 (USA)
| | - Oleg Poluektov
- Argonne National Laboratory, Chemistry Division, E117, 9700 South Cass Ave. Argonne, IL 60439 (USA)
| | - H. Bernhard Schlegel
- Department of Chemistry, Wayne State University, 5101 Cass Ave, Detroit, MI 48202 (USA) http://chem.wayne.edu/veranigroup/
| | - Cláudio N. Verani
- Department of Chemistry, Wayne State University, 5101 Cass Ave, Detroit, MI 48202 (USA) http://chem.wayne.edu/veranigroup/
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12
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Basu D, Mazumder S, Shi X, Baydoun H, Niklas J, Poluektov O, Schlegel HB, Verani CN. Ligand transformations and efficient proton/water reduction with cobalt catalysts based on pentadentate pyridine-rich environments. Angew Chem Int Ed Engl 2014; 54:2105-10. [PMID: 25533319 DOI: 10.1002/anie.201409813] [Citation(s) in RCA: 56] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2014] [Revised: 11/25/2014] [Indexed: 11/10/2022]
Abstract
A series of cobalt complexes with pentadentate pyridine-rich ligands is studied. An initial Co(II) amine complex 1 is prone to aerial oxidation yielding a Co(III) imine complex 2 that is further converted into an amide complex 4 in presence of adventitious water. Introduction of an N-methyl protecting group to the ligand inhibits this oxidation and gives rise to the Co(II) species 5. Both the Co(III) 4 and Co(II) 5 show electrocatalytic H2 generation in weakly acidic media as well as in water. Mechanisms of catalysis seem to involve the protonation of a Co(II)-H species generated in situ.
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Affiliation(s)
- Debashis Basu
- Department of Chemistry, Wayne State University, 5101 Cass Ave, Detroit, MI 48202 (USA) http://chem.wayne.edu/veranigroup/
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13
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Alaji Z, Safaei E, Chiang L, Clarke RM, Mu C, Storr T. A Copper Complex of a Noninnocent Iminophenol-Amidopyridine Hybrid Ligand: Synthesis, Characterization, and Aerobic Alcohol Oxidation. Eur J Inorg Chem 2014. [DOI: 10.1002/ejic.201402687] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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14
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Yousef Ebrahimipour S, Mague JT, Akbari A, Takjoo R. Synthesis, characterization, crystal structure and thermal behavior of 4-Bromo-2-(((5-chloro-2-hydroxyphenyl)imino)methyl)phenol and its oxido-vanadium(V) complexes. J Mol Struct 2012. [DOI: 10.1016/j.molstruc.2012.05.076] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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15
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Tamura M, Tsuge K, Igashira-Kamiyama A, Konno T. Bis(bipyridine)ruthenium(II) Complexes with an Aliphatic Sulfinato Donor: Synthesis, Characterization, and Properties. Inorg Chem 2011; 50:4764-71. [DOI: 10.1021/ic102319p] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Motoshi Tamura
- Department of Chemistry, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - Kiyoshi Tsuge
- Department of Chemistry, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - Asako Igashira-Kamiyama
- Department of Chemistry, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - Takumi Konno
- Department of Chemistry, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan
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Carlson LJ, Welby J, Zebrowski KA, Wilk MM, Giroux R, Ciancio N, Tanski JM, Bradley A, Tyler LA. Spectroscopic differences between heterocyclic benzothiazoline, -thiazole and imine containing ligands and comparison of the Co and Cu pyridine benzothiazole and imine complexes. Inorganica Chim Acta 2011. [DOI: 10.1016/j.ica.2010.09.002] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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18
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Shearer J, Callan PE, Amie J. Use of metallopeptide based mimics demonstrates that the metalloprotein nitrile hydratase requires two oxidized cysteinates for catalytic activity. Inorg Chem 2010; 49:9064-77. [PMID: 20831172 PMCID: PMC3570060 DOI: 10.1021/ic101765h] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Nitrile hydratases (NHases) are non-heme Fe(III) or non-corrin Co(III) containing metalloenzymes that possess an N(2)S(3) ligand environment with nitrogen donors derived from amidates and sulfur donors derived from cysteinates. A closely related enzyme is thiocyanate hydrolase (SCNase), which possesses a nearly identical active-site coordination environment as CoNHase. These enzymes are redox inactive and perform hydrolytic reactions; SCNase hydrolyzes thiocyanate anions while NHase converts nitriles into amides. Herein an active CoNHase metallopeptide mimic, [Co(III)NHase-m1] (NHase-m1 = AcNH-CCDLP-CGVYD-PA-COOH), that contains Co(III) in a similar N(2)S(3) coordination environment as CoNHase is reported. [Co(III)NHase-m1] was characterized by electrospray ionization-mass spectrometry (ESI-MS), gel-permeation chromatography (GPC), Co K-edge X-ray absorption spectroscopy (Co-S: 2.21 Å; Co-N: 1.93 Å), vibrational, and optical spectroscopies. We find that [Co(III)NHase-m1] will perform the catalytic conversion of acrylonitrile into acrylamide with up to 58 turnovers observed after 18 h at 25 °C (pH 8.0). FTIR data used in concert with calculated vibrational data (mPWPW91/aug-cc-TZVPP) demonstrates that the active form of [Co(III)NHase-m1] has a ligated SO(2) (ν = 1091 cm(-1)) moiety and a ligated protonated SO(H) (ν = 928 cm(-1)) moiety; when only one oxygenated cysteinate ligand (i.e., a mono-SO(2) coordination motif) or the bis-SO(2) coordination motif are found within [Co(III)NHase-m1] no catalytic activity is observed. Calculations of the thermodynamics of ligand exchange (B3LYP/aug-cc-TZVPP) suggest that the reason for this is that the SO(2)/SO(H) equatorial ligand motif promotes both water dissociation from the Co(III)-center and nitrile coordination to the Co(III)-center. In contrast, the under- or overoxidized motifs will either strongly favor a five coordinate Co(III)-center or strongly favor water binding to the Co(III)-center over nitrile binding.
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Affiliation(s)
- Jason Shearer
- Department of Chemistry, University of Nevada, Reno, Nevada 89557, USA.
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Intramolecular amide→imine reduction in higher valent rhenium complexes stabilized by arylimido coligand: Rate studies and effect of reductants. Polyhedron 2009. [DOI: 10.1016/j.poly.2009.04.040] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Garnovskii AD, Vasilchenko IS, Garnovskii DA, Kharisov BI. Molecular design of mononuclear complexes of acyclic Schiff-base ligands. J COORD CHEM 2008. [DOI: 10.1080/00958970802398178] [Citation(s) in RCA: 88] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Affiliation(s)
- A. D. Garnovskii
- a Institute of Physical and Organic Chemistry , Southern Federal University , 344090, Stachki. av., 104/2, Rostov-on-Don, Russian Federation
| | - I. S. Vasilchenko
- b Southern Scientific Center of Russian Academy of Sciences , 344006, Chekhova av., 41, Rostov-on-Don, Russian Federation
| | - D. A. Garnovskii
- a Institute of Physical and Organic Chemistry , Southern Federal University , 344090, Stachki. av., 104/2, Rostov-on-Don, Russian Federation
| | - B. I. Kharisov
- c CIIDIT-Facultad de Ciencias Quimicas , Universidad Autonoma de Nuevo Leon , San Nicolas de los Garza, N.L., A.P.18-F, C.P. 66450, Mexico
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Taylor MK, Trotter KD, Reglinski J, Berlouis LE, Kennedy AR, Spickett CM, Sowden RJ. Copper N2S2 Schiff base macrocycles: The effect of structure on redox potential. Inorganica Chim Acta 2008. [DOI: 10.1016/j.ica.2008.02.021] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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22
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Hopmann KH, Himo F. Theoretical Investigation of the Second-Shell Mechanism of Nitrile Hydratase. Eur J Inorg Chem 2008. [DOI: 10.1002/ejic.200701137] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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23
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Kawamoto T, Suzuki S, Konno T. Synthesis and characterization of cyclometallated palladium(II) and platinum(II) complexes with amide-thiolate ligands. J Organomet Chem 2007. [DOI: 10.1016/j.jorganchem.2006.08.051] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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24
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Yano T, Arii H, Yamaguchi S, Funahashi Y, Jitsukawa K, Ozawa T, Masuda H. CoIII Complexes with Square-Planar N2S2- and N2(SO2)2-Type Ligands as An Active Site Structural Model for Nitrile Hydratase – Biological Implications of an Amidate Coordination. Eur J Inorg Chem 2006. [DOI: 10.1002/ejic.200600507] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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25
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Syntheses, structures, and properties of Co(III) complexes derived from polypyridine ligands containing one carboxamido nitrogen donor. Inorganica Chim Acta 2006. [DOI: 10.1016/j.ica.2006.04.020] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Ozawa T, Ikeda T, Yano T, Arii H, Yamaguchi S, Funahashi Y, Jitsukawa K, Masuda H. Coordination of a Water Molecule to a Square-pyramidal N2S3-type Co(III) Complex Directed to an Active Site of Nitrile Hydratase. CHEM LETT 2005. [DOI: 10.1246/cl.2005.18] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Bis-axial cyanide coordination induces high nucleophilicity of the in-plane thiolato ligands bound to a Co(III) center: model complexes related to the Co-containing nitrile hydratases. Inorganica Chim Acta 2004. [DOI: 10.1016/j.ica.2004.02.011] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Harrop TC, Mascharak PK. Fe(III) and Co(III) centers with carboxamido nitrogen and modified sulfur coordination: lessons learned from nitrile hydratase. Acc Chem Res 2004; 37:253-60. [PMID: 15096062 DOI: 10.1021/ar0301532] [Citation(s) in RCA: 148] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Nitrile hydratase (NHase) is a non-heme Fe(III) or non-corrinoid Co(III) metalloenzyme with an unprecedented coordination sphere comprising deprotonated carboxamido nitrogens and modified Cys-S (-SO(-) and -SO(2)(-)) sulfurs. We have synthesized model complexes derived from designed ligands that contain these donor groups. The model complexes mimic almost all the intrinsic properties of the unique M(III) (M = Fe, Co) active site of NHase. Even a functional Co(III) model has been synthesized that hydrolyzes nitriles catalytically at pH close to the optimum pH of the enzyme. Our studies have provided insight into how the unusual donor atoms dictate the overall properties of the biological M(III) sites.
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Affiliation(s)
- Todd C Harrop
- Department of Chemistry and Biochemistry, University of California, Santa Cruz, California 95064, USA
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Grapperhaus CA, Mullins CS, Kozlowski PM, Mashuta MS. Synthesis and Oxygenation of a Nickel(II) and Zinc(II) Dithiolate: An Experimental and Theoretical Comparison. Inorg Chem 2004; 43:2859-66. [PMID: 15106973 DOI: 10.1021/ic035205y] [Citation(s) in RCA: 61] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The diamino-dithiolato N2S2 ligand N,N'-bis-2-methyl-mercaptopropyl-N,N'-dimethylethylenediamine, H2bmmp-dmed), and its nickel (1) and zinc (2) complexes have been prepared and their reactivities with hydrogen peroxide investigated. Complex 1 yields a mixture of sulfenato (RSO-), 4, sulfinato (RSO2-), 3, and sulfonato (RSO3-), 5, products upon addition of H2O2. Products are separable by column chromatography. Stoichiometric addition of H2O2 to 2 yields an inseparable mixture. Excess peroxide addition results in oxygenation of the ligand to the disulfonate, 6, and decomplexation of zinc. Complexes 1, 2, and 3 and compound 6 have been investigated by X-ray crystallography, and their structures are reported. Density functional theory (DFT) calculations of 1 and 2 reveal significant sulfur p character in the HOMO of each complex. However, 1 also shows significant metal d character that is pi-antibonding with respect to the sulfur p orbitals. Complex 2 shows little metal character in the HOMO. Implications of the HOMO with respect to S-centered reactivity and metal ligand distances in S-oxygenated products are provided.
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Affiliation(s)
- Craig A Grapperhaus
- Department of Chemistry, University of Louisville, Louisville, Kentucky 40292, USA.
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Kotera T, Fujita A, Mikuriya M, Tsutsumi H, Handa M. Cobalt complexes with 2-[(3-aminopropyl)amino]ethanethiol. INORG CHEM COMMUN 2003. [DOI: 10.1016/s1387-7003(02)00755-4] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Rat M, Sousa R, Tomas A, Frapart Y, Tuchagues JP, Artaud I. Synthesis, X-ray Structure and Properties of a Trinuclear Mixed-Valence CoIII-CoII-CoIII Complex with Carboxamido N and Sulfinato S Donors. Eur J Inorg Chem 2003. [DOI: 10.1002/ejic.200390105] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Patra AK, Olmstead MM, Mascharak PK. Spontaneous reduction of a low-spin Fe(III) complex of a neutral pentadentate N(5) Schiff base ligand to the corresponding Fe(II) species in acetonitrile. Inorg Chem 2002; 41:5403-9. [PMID: 12377034 DOI: 10.1021/ic020373w] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The iron complexes of a designed pentadentate Schiff base ligand N,N-bis(2-pyridylmethyl)amine-N-ethyl-2-pyridine-2-aldimine (SBPy(3)) have been synthesized. The low-spin mononuclear Fe(III) complex [(SBPy(3))Fe(DMF)](ClO(4))(3) (2), though stable in the solid state, is spontaneously reduced to the corresponding Fe(II) species [(SBPy(3))Fe(MeCN)](2+) in MeCN. Fe(II) complex [(SBPy(3))Fe(MeCN)](BF(4))(2) (3) has been isolated independently and characterized by crystallography. Electrochemical studies indicate that SBPy(3), like other pentadentate polypyridine ligands, stabilizes the Fe(II) center to a great extent (E(1/2) = 1.01 V vs SCE in MeCN). This fact is responsible for the ready reduction of 2. It is evident that such reactivity has brought complications in the syntheses of iron complexes of polypyridine ligands reported in previous accounts. Very low solubility of 2 in MeOH has allowed isolation of analytically pure 2 in the present work. Storage of dilute methanolic solution of 2 results in the formation of the mu-oxo Fe(III) dimer [(SBPy(3))FeOFe(SBPy(3))](ClO(4))(4) (5), the structure of which has also been determined. Fe(II) complex 3 reacts with CN(-) to afford cyanide adduct [(SBPy(3))Fe(CN)](BF(4)) (4) but does not exhibit any reactivity toward NO. The azomethine moiety (CH=N-py) of 2 is rapidly oxidized by H(2)O(2) to a pyridine-2-carboxamido (C(=O)-N-py) unit and affords [(PaPy(3))Fe(MeCN)](ClO(4))(2) (1), a complex previously reported by us.
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Affiliation(s)
- Apurba K Patra
- Department of Chemistry and Biochemistry, University of California, Santa Cruz, CA 95064, USA
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Tyler LA, Olmstead MM, Mascharak PK. Modulation in the reactivity of imine group by aryl and alkyl thiolato sulfur on ligands coordinated to Co(III) center: relevance to the Co-containing enzyme nitrile hydratase. Inorganica Chim Acta 2002. [DOI: 10.1016/s0020-1693(02)00913-1] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Rowland JM, Olmstead MM, Mascharak PK. Unusual reactivity of methylene group adjacent to pyridine-2-carboxamido moiety in iron(III) and cobalt(III) complexes. Inorg Chem 2002; 41:2754-60. [PMID: 12005500 DOI: 10.1021/ic011197e] [Citation(s) in RCA: 52] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The Fe(III) and Co(III) complexes of the ligand N-(2-picolyl)picolinamide (pmpH; H represents the dissociable amide hydrogen), namely, [Fe(pmp)(2)]BF(4) (1) and [Co(pmp)(2)]ClO(4) (2), have been synthesized and structurally characterized. The [bond]CH(2)[bond] moiety of pmp(-) in [M(pmp)(2)](+) (M = Fe, Co) is very reactive and is readily converted to carbonyl (C[double bond]O) group upon exposure to dioxygen. Such conversion results in [M(bpca)(2)]ClO(4) complexes (M = Fe (3), Co (5); bpcaH = bis(2-pyridylcarbonyl)amine) which have been characterized by spectroscopy and X-ray diffraction. The structure of 5 is reported here for the first time. The reactivity of the [bond]CH(2)[bond] moiety of pmp(-) has so far precluded the isolation of 1 although other metal complexes of pmp(-) have been reported years ago. The CH(2) --> C[double bond]O transformation arises from the tendency of the coordinated pmp(-) ligand to achieve further conjugation in the ligand framework and provides a better way to synthesize the metal complexes of bpcaH ligand. Reaction of 3 with NaH affords Fe(II) complex [Fe(bpca)(2)] (4) without any reduction of the ligand frame.
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Affiliation(s)
- John M Rowland
- Department of Chemistry and Biochemistry, University of California, Santa Cruz, California 95064, USA
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Rowland JM, Olmstead MM, Mascharak PK. Synthesis, structure and properties of bis[N,N-bis(2-pyridylmethyl)amine-N-ethyl-2-pyridine-2-carboxamidecopper(II)] perchlorate. Inorganica Chim Acta 2002. [DOI: 10.1016/s0020-1693(01)00798-8] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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