1
|
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]
|
2
|
Jakusch T, Hassoon AA, Kiss T. Characterization of copper(II) specific pyridine containing ligands: Potential metallophores for Alzheimer's disease therapy. J Inorg Biochem 2021; 228:111692. [PMID: 34990971 DOI: 10.1016/j.jinorgbio.2021.111692] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2021] [Revised: 11/29/2021] [Accepted: 12/03/2021] [Indexed: 10/19/2022]
Abstract
Two amide group containing pyridine derivatives, N-(pyridin-2-ylmethyl)picolinamide (PMPA) and N-(pyridin-2-ylmethyl)-2-((pyridin-2-ylmethyl)amino)acetamide (DPMGA), have been investigated as potential metallo-phores in the therapy of Alzheimer's disease. Their complex formation with Cu(II) and Zn(II) were characterized in details. Unexpectedly not only the Cu(II) but also the Zn(II) was able to induce deprotonation of the amide-NH, however, it occurred only at higher pH or at higher metal ion concentrations than the biological conditions. At μM concentration level mono complexes (MLH-1) dominate with both ligands. Direct fluorescence and reactive oxygen species (ROS) producing measurements prove that both ligands are able to remove Cu(II) from its amyloid-β complexes (CuAβ). Correlation was also established between the conditional stability constant of the Cu(II) complexes with different ligands and their ability of inhibition of ROS production by CuAβ.
Collapse
Affiliation(s)
- Tamás Jakusch
- Department of Inorganic and Analytical Chemistry, University of Szeged, Dóm tér 7, H-6720 Szeged, Hungary.
| | - Azza A Hassoon
- Department of Inorganic and Analytical Chemistry, University of Szeged, Dóm tér 7, H-6720 Szeged, Hungary
| | - Tamás Kiss
- Department of Inorganic and Analytical Chemistry, University of Szeged, Dóm tér 7, H-6720 Szeged, Hungary.
| |
Collapse
|
3
|
Misawa-Suzuki T, Etoh M, Nagao H. Interactions of Ruthenium(III) Complexes Bearing Bis(2-pyridylcarbonyl)aminate with Cations at the Carbonyl Group. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2020. [DOI: 10.1246/bcsj.20200127] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Affiliation(s)
| | - Mami Etoh
- Sophia University, 7-1 Kioicho, Chiyoda-ku, Tokyo 102-8554, Japan
| | - Hirotaka Nagao
- Sophia University, 7-1 Kioicho, Chiyoda-ku, Tokyo 102-8554, Japan
| |
Collapse
|
4
|
Singh A, Dey S, Panda S, Lahiri GK. Redox Induced Tunable Functionalization of Picolylamines on Selective Ru‐Platform. Eur J Inorg Chem 2020. [DOI: 10.1002/ejic.202000918] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Affiliation(s)
- Aditi Singh
- 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
| | - 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
| |
Collapse
|
5
|
Ramírez E, Hossain MK, Flores‐Alamo M, Haukka M, Nordlander E, Castillo I. Oxygen Transfer from Trimethylamine
N
‐Oxide to Cu
I
Complexes Supported by Pentanitrogen Ligands. Eur J Inorg Chem 2020. [DOI: 10.1002/ejic.202000488] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Affiliation(s)
- Erick Ramírez
- Instituto de Química Universidad Nacional Autónoma de México Circuito Exterior CU 04510 México México
| | - Md. Kamal Hossain
- Chemical Physics Center for Chemistry and Chemical Engineering Lund University Box 124 221 00 Lund Sweden
| | - Marcos Flores‐Alamo
- Facultad de Química División de Estudios de Posgrado Universidad Nacional Autónoma de México México 04510 México
| | - Matti Haukka
- Department of Chemistry University of Jyväskylä P.O. Box‐35 40014 Jyväskylä Finland
| | - Ebbe Nordlander
- Chemical Physics Center for Chemistry and Chemical Engineering Lund University Box 124 221 00 Lund Sweden
| | - Ivan Castillo
- Instituto de Química Universidad Nacional Autónoma de México Circuito Exterior CU 04510 México México
| |
Collapse
|
6
|
Omer HM, Liu P, Brummond KM. Metal-Free C-C Coupling of an Allenyl Sulfone with Picolyl Amides to Access Vinyl Sulfones via Pyridine-Initiated In Situ Generation of Sulfinate Anion. J Org Chem 2020; 85:7959-7975. [PMID: 32423208 DOI: 10.1021/acs.joc.0c00788] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
Vinyl sulfones are privileged motifs known for their biological activity and synthetic utility. Synthetic transformations to efficiently access high-value compounds with these motifs are desired and sought after. Herein, a new procedure is described to form vinyl sulfone-containing compounds by selective functionalization of the C(sp3)-H bond adjacent to the pyridine ring of pharmacologically prevalent picolyl amides with an allenyl sulfone, 1-methyl-4-(propa-1,2-dien-1-ylsulfonyl)benzene. The reaction conditions are mild with no metal catalyst or additives required and display good functional group tolerance. Mechanistic studies for this unusual transformation suggest that the reaction operates via a rare pyridine-initiated and p-toluenesulfinate anion-mediated activation of the allenyl sulfone analogous to phosphine-triggered reactions.
Collapse
Affiliation(s)
- Humair M Omer
- Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
| | - Peng Liu
- Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
| | - Kay M Brummond
- Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
| |
Collapse
|
7
|
Chakraborty B, Ghosh I, Jana RD, Paine TK. Oxidative C-N bond cleavage of (2-pyridylmethyl)amine-based tetradentate supporting ligands in ternary cobalt(ii)-carboxylate complexes. Dalton Trans 2020; 49:3463-3472. [PMID: 32103212 DOI: 10.1039/c9dt04438h] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Three mononuclear cobalt(ii)-carboxylate complexes, [(TPA)CoII(benzilate)]+ (1), [(TPA)CoII(benzoate)]+ (2) and [(iso-BPMEN)CoII(benzoate)]+ (3), of N4 ligands (TPA = tris(2-pyridylmethyl)amine and iso-BPMEN = N1,N1-dimethyl-N2,N2-bis((pyridin-2-yl)methyl)ethane-1,2-diamine) were isolated to investigate their reactivity toward dioxygen. Monodentate (η1) binding of the carboxylates to the metal centre favours the five-coordinate cobalt(ii) complexes (1-3) for dioxygen activation. Complex 1 slowly reacts with dioxygen to enable the oxidative decarboxylation of the coordinated α-hydroxy acid (benzilate). Prolonged exposure of the reaction solution of 2 to dioxygen results in the formation of [(DPA)CoIII(picolinate)(benzoate)]+ (4) and [CoIII(BPCA)2]+ (5) (DPA = di(2-picolyl)amine and HBPCA = bis(2-pyridylcarbonyl)amide), whereas only [(DPEA)CoIII(picolinate)(benzoate)]+ (6) (DPEA = N1,N1-dimethyl-N2-(pyridine-2-ylmethyl)-ethane-1,2-diamine) is isolated from the final oxidised solution of 3. The modified ligand DPA (or DPEA) is formed via the oxidative C-N bond cleavage of the supporting ligands. Further oxidation of the -CH2- moiety to -C([double bond, length as m-dash]O)- takes place in the transformation of DPA to HBPCA on the cobalt(ii) centre. Labelling experiments with 18O2 confirm the incorporation of oxygen atoms from molecular oxygen into the oxidised products. Mixed labelling studies with 16O2 and H2O18 strongly support the involvement of water in the C-N bond cleavage pathway. A comparison of the dioxygen reactivity of the cobalt complexes (1-3) with those of several other five-coordinate mononuclear complexes [(TPA)CoII(X)]+/2+ (X = Cl, CH3CN, acetate, benzoylformate, salicylate and phenylpyruvate) establishes the role of the carboxylate co-ligands in the activation of dioxygen and subsequent oxidative cleavage of the supporting ligands by a metal-oxygen oxidant.
Collapse
Affiliation(s)
- Biswarup Chakraborty
- School of Chemical Sciences, Indian Association for the Cultivation of Science, 2A & 2B Raja S. C. Mullick Road, Jadavpur, Kolkata 700032, India.
| | | | | | | |
Collapse
|
8
|
Panda S, Singha Hazari A, Gogia M, Lahiri GK. Diverse Functionalization of Ruthenium-Chelated 2-Picolylamines: Oxygenation, Dehydrogenation, Cyclization, and N-Dealkylation. Inorg Chem 2020; 59:1355-1363. [DOI: 10.1021/acs.inorgchem.9b03065] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Sanjib Panda
- Department of Chemistry, Indian Institute of Technology (IIT) Bombay, Powai, Mumbai 400076, India
| | - Arijit Singha Hazari
- Department of Chemistry, Indian Institute of Technology (IIT) Bombay, Powai, Mumbai 400076, India
| | - Manish Gogia
- Department of Chemistry, Indian Institute of Technology (IIT) Bombay, Powai, Mumbai 400076, India
| | - Goutam Kumar Lahiri
- Department of Chemistry, Indian Institute of Technology (IIT) Bombay, Powai, Mumbai 400076, India
| |
Collapse
|
9
|
Wang W, Qiu B, Yang X. Computational prediction of pentadentate iron and cobalt complexes as a mimic of mono-iron hydrogenase for the hydrogenation of carbon dioxide to methanol. Dalton Trans 2019; 48:8034-8038. [PMID: 31074752 DOI: 10.1039/c9dt01405e] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A series of amidate-ligated pentadentate iron and cobalt complexes with N-heterocyclic pyridinol groups were proposed and computationally screened as potential catalysts for CO2 reduction. Density functional theory calculations reveal a ligand assisted heterolytic H2 cleavage mechanism with a total free energy barrier of 23.3 kcal mol-1 for the hydrogenation of CO2 to methanol catalysed by a pentadentate Co complex with a 2-[bis(pyridine-2-ylmethyl)]amino-N-3,9-purin-2-one ligand.
Collapse
Affiliation(s)
- Wan Wang
- Beijing National Laboratory for Molecular Sciences, State Key Laboratory for Structural Chemistry of Unstable and Stable Species, CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, P. R. China. and University of Chinese Academy of Sciences, Beijing 100049, P. R. China
| | - Bing Qiu
- Beijing National Laboratory for Molecular Sciences, State Key Laboratory for Structural Chemistry of Unstable and Stable Species, CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, P. R. China. and University of Chinese Academy of Sciences, Beijing 100049, P. R. China
| | - Xinzheng Yang
- Beijing National Laboratory for Molecular Sciences, State Key Laboratory for Structural Chemistry of Unstable and Stable Species, CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, P. R. China. and University of Chinese Academy of Sciences, Beijing 100049, P. R. China
| |
Collapse
|
10
|
Li FF, Chen HY, Jin Y, Zhao QH, Xie MJ. Synthesis, X-Ray Structure and In Vitro Cytotoxic Activity of a New Dinuclear Cobalt(III) Complex with Diazine Ligands. Pharm Chem J 2018. [DOI: 10.1007/s11094-018-1711-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
11
|
Sengupta A, Rajput A, Barman SK, Mukherjee R. Low-spin [M II(L) 2] and [M III(L) 2] + (M = Fe and Co) complexes of tridentate azo-containing pyridine/pyrazine amide ligands: structures, properties and redox potential correlations. Dalton Trans 2017; 46:11291-11305. [PMID: 28805866 DOI: 10.1039/c7dt01577a] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Using deprotonated forms of tridentate azo-containing pyridine-2-/pyrazine-2-carboxamide 2-[N-(2-phenylazo)carbamoyl]-pyridine/pyrazine, seven bis-ligand complexes of FeII/CoII and FeIII/CoIII have been synthesized. Molecular structures of six of them reveal that these six-coordinate complexes utilize all available donor sites of the ligands and assume MII/IIIN2(pyridine/pyrazine)N'2(amide)N''2(azo) coordination. Complexes of FeII and CoIII are diamagnetic and those of FeIII and CoII are paramagnetic (S = 1/2; room-temperature magnetic data and EPR spectra). Cyclic voltammetry experiments in CH2Cl2 reveal facile metal-centred FeIII/FeII and CoIII/CoII redox responses, and all complexes display quasireversible-to-irreversible ligand(azo)-centred redox processes. The E1/2 values of MIII/MII redox processes for Fe, Co and Ni (reported earlier) complexes of the pyridine amide ligand linearly correlate with those for six-coordinate [MIII(bpy)3]3+/[MII(bpy)3]2+, [MIII(terpy)2]3+/[MII(terpy)2]2+, [MIII(L)]+/[MII(L)]0 or [MIII(L')2]+/[MII(L')2]0 (bpy = 2,2'-bipyridine, terpy = 2,2':6',2''-terpyridine, hexadentate L(2-) = 1,4-bis[o-(pyridine-2-carboxamidophenyl)]-1,4-dithiobutane and tridentate L'(-) = {2-[2-(arylimino)phenylazo]-pyridine}) couples. Density functional theory (DFT) at the B3LYP level and time-dependent (TD)-DFT calculations rationalize the electronic structure of the present complexes and throw light on the origin of observed electronic transitions.
Collapse
Affiliation(s)
- Arunava Sengupta
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur 208 016, India.
| | | | | | | |
Collapse
|
12
|
Truong PT, Gale EM, Dzul SP, Stemmler TL, Harrop TC. Steric Enforcement about One Thiolate Donor Leads to New Oxidation Chemistry in a NiSOD Model Complex. Inorg Chem 2017; 56:7761-7780. [PMID: 28459242 DOI: 10.1021/acs.inorgchem.7b00485] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Ni-containing superoxide dismutase (NiSOD) represents an unusual member of the SOD family due to the presence of oxygen-sensitive Ni-SCys bonds at its active site. Reported in this account is the synthesis and properties of the NiII complex of the N3S2 ligand [N3S2Me2]3- ([N3S2Me2]3- = deprotonated form of 2-((2-mercapto-2-methylpropyl)(pyridin-2-ylmethyl)amino)-N-(2-mercaptoethyl)acetamide), namely Na[Ni(N3S2Me2)] (2), as a NiSOD model that features sterically robust gem-(CH3)2 groups on the thiolate α-C positioned trans to the carboxamide. The crystal structure of 2, coupled with spectroscopic measurements from 1H NMR, X-ray absorption, IR, UV-vis, and mass spectrometry (MS), reveal a planar NiII (S = 0) ion coordinated by only the N2S2 basal donors of the N3S2 ligand. While the structure and spectroscopic properties of 2 resemble those of NiSODred and other models, the asymmetric S ligands open up new reaction paths upon chemical oxidation. One unusual oxidation product is the planar NiII-N3S complex [Ni(Lox)] (5; Lox = 2-(5,5-dimethyl-2-(pyridin-2-yl)thiazolidin-3-yl)-N-(2-mercaptoethyl)acetamide), where two-electron oxidation takes place at the substituted thiolate and py-CH2 carbon to generate a thiazolidine heterocycle. Electrochemical measurements of 2 reveal irreversible events wholly consistent with thiolate redox, which were identified by comparison to the ZnII complex Na[Zn(N3S2Me2)] (3). Although no reaction is observed between 2 and azide, reaction of 2 with superoxide produces multiple products on the basis of UV-vis and MS data, one of which is 5. Density functional theory (DFT) computations suggest that the HOMO in 2 is π* with primary contributions from Ni-dπ/S-pπ orbitals. These contributions can be modulated and biased toward Ni when electron-withdrawing groups are placed on the thiolate α-C. Analysis of the oxidized five-coordinate species 2ox* by DFT reveal a singly occupied spin-up (α) MO that is largely thiolate based, which supports the proposed NiIII-thiolate/NiII-thiyl radical intermediates that ultimately yield 5 and other products.
Collapse
Affiliation(s)
- Phan T Truong
- Department of Chemistry and Center for Metalloenzyme Studies, The University of Georgia , 140 Cedar Street, Athens, Georgia 30602, United States
| | - Eric M Gale
- Department of Chemistry and Center for Metalloenzyme Studies, The University of Georgia , 140 Cedar Street, Athens, Georgia 30602, United States
| | - Stephen P Dzul
- Departments of Pharmaceutical Sciences, Biochemistry and Molecular Biology, Wayne State University , Detroit, Michigan 48201, United States
| | - Timothy L Stemmler
- Departments of Pharmaceutical Sciences, Biochemistry and Molecular Biology, Wayne State University , Detroit, Michigan 48201, United States
| | - Todd C Harrop
- Department of Chemistry and Center for Metalloenzyme Studies, The University of Georgia , 140 Cedar Street, Athens, Georgia 30602, United States
| |
Collapse
|
13
|
Markiewicz G, Piechocki M, Walczak A, Połomska EA, Harrowfield J, Stefankiewicz AR. Generation and transformation of a hemi-iminal-based metal–organic Fe(ii) structure obtained via subcomponent self-assembly in water. Dalton Trans 2017; 46:14826-14830. [DOI: 10.1039/c7dt03182c] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Generation of hemi-iminal Fe(ii) species from subcomponent self-assembly in water.
Collapse
Affiliation(s)
- Grzegorz Markiewicz
- Faculty of Chemistry
- Adam Mickiewicz University
- 61-614 Poznań
- Poland
- Center for Advanced Technologies
| | - Miłosz Piechocki
- Faculty of Chemistry
- Adam Mickiewicz University
- 61-614 Poznań
- Poland
- Center for Advanced Technologies
| | - Anna Walczak
- Faculty of Chemistry
- Adam Mickiewicz University
- 61-614 Poznań
- Poland
- Center for Advanced Technologies
| | - Ewa A. Połomska
- Faculty of Chemistry
- Adam Mickiewicz University
- 61-614 Poznań
- Poland
- Center for Advanced Technologies
| | | | - Artur R. Stefankiewicz
- Faculty of Chemistry
- Adam Mickiewicz University
- 61-614 Poznań
- Poland
- Center for Advanced Technologies
| |
Collapse
|
14
|
|
15
|
Olivo G, Nardi M, Vìdal D, Barbieri A, Lapi A, Gómez L, Lanzalunga O, Costas M, Di Stefano S. C-H Bond Oxidation Catalyzed by an Imine-Based Iron Complex: A Mechanistic Insight. Inorg Chem 2015; 54:10141-52. [PMID: 26457760 DOI: 10.1021/acs.inorgchem.5b01500] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A family of imine-based nonheme iron(II) complexes (LX)2Fe(OTf)2 has been prepared, characterized, and employed as C-H oxidation catalysts. Ligands LX (X = 1, 2, 3, and 4) stand for tridentate imine ligands resulting from spontaneous condensation of 2-pycolyl-amine and 4-substituted-2-picolyl aldehydes. Fast and quantitative formation of the complex occurs just upon mixing aldehyde, amine, and Fe(OTf)2 in a 2:2:1 ratio in acetonitrile solution. The solid-state structures of (L1)2Fe(OTf)(ClO4) and (L3)2Fe(OTf)2 are reported, showing a low-spin octahedral iron center, with the ligands arranged in a meridional fashion. (1)H NMR analyses indicate that the solid-state structure and spin state is retained in solution. These analyses also show the presence of an amine-imine tautomeric equilibrium. (LX)2Fe(OTf)2 efficiently catalyze the oxidation of alkyl C-H bonds employing H2O2 as a terminal oxidant. Manipulation of the electronic properties of the imine ligand has only a minor impact on efficiency and selectivity of the oxidative process. A mechanistic study is presented, providing evidence that C-H oxidations are metal-based. Reactions occur with stereoretention at the hydroxylated carbon and selectively at tertiary over secondary C-H bonds. Isotopic labeling analyses show that H2O2 is the dominant origin of the oxygen atoms inserted in the oxygenated product. Experimental evidence is provided that reactions involve initial oxidation of the complexes to the ferric state, and it is proposed that a ligand arm dissociates to enable hydrogen peroxide binding and activation. Selectivity patterns and isotopic labeling studies strongly suggest that activation of hydrogen peroxide occurs by heterolytic O-O cleavage, without the assistance of a cis-binding water or alkyl carboxylic acid. The sum of these observations provides sound evidence that controlled activation of H2O2 at (LX)2Fe(OTf)2 differs from that occurring in biomimetic iron catalysts described to date.
Collapse
Affiliation(s)
- Giorgio Olivo
- Dipartimento di Chimica, Università degli Studi di Roma "La Sapienza" and Istituto CNR di Metodologie Chimiche (IMC-CNR), Sezione Meccanismi di Reazione, c/o Dipartimento di Chimica, Università degli Studi di Roma "La Sapienza", P.le A. Moro 5, I-00185 Rome, Italy.,Institut de Química Computacional i Catàlisi (IQCC) and Departament de Química, Universitat de Girona , Campus de Montilivi, 17071 Girona, Spain
| | - Martina Nardi
- Dipartimento di Chimica, Università degli Studi di Roma "La Sapienza" and Istituto CNR di Metodologie Chimiche (IMC-CNR), Sezione Meccanismi di Reazione, c/o Dipartimento di Chimica, Università degli Studi di Roma "La Sapienza", P.le A. Moro 5, I-00185 Rome, Italy
| | - Diego Vìdal
- Institut de Química Computacional i Catàlisi (IQCC) and Departament de Química, Universitat de Girona , Campus de Montilivi, 17071 Girona, Spain
| | - Alessia Barbieri
- Dipartimento di Chimica, Università degli Studi di Roma "La Sapienza" and Istituto CNR di Metodologie Chimiche (IMC-CNR), Sezione Meccanismi di Reazione, c/o Dipartimento di Chimica, Università degli Studi di Roma "La Sapienza", P.le A. Moro 5, I-00185 Rome, Italy
| | - Andrea Lapi
- Dipartimento di Chimica, Università degli Studi di Roma "La Sapienza" and Istituto CNR di Metodologie Chimiche (IMC-CNR), Sezione Meccanismi di Reazione, c/o Dipartimento di Chimica, Università degli Studi di Roma "La Sapienza", P.le A. Moro 5, I-00185 Rome, Italy.,Consortium of Chemical Catalysis and Reactivity, CIRCC Interuniversity , Via Celso Ulpiani 27, 70126 Bari, Italy
| | - Laura Gómez
- Institut de Química Computacional i Catàlisi (IQCC) and Departament de Química, Universitat de Girona , Campus de Montilivi, 17071 Girona, Spain.,Serveis Tècnics de Recerca (STR), Universitat de Girona , Parc Cientı́fic i Tecnològic, E-17003 Girona, Spain
| | - Osvaldo Lanzalunga
- Dipartimento di Chimica, Università degli Studi di Roma "La Sapienza" and Istituto CNR di Metodologie Chimiche (IMC-CNR), Sezione Meccanismi di Reazione, c/o Dipartimento di Chimica, Università degli Studi di Roma "La Sapienza", P.le A. Moro 5, I-00185 Rome, Italy.,Consortium of Chemical Catalysis and Reactivity, CIRCC Interuniversity , Via Celso Ulpiani 27, 70126 Bari, Italy
| | - Miquel Costas
- Institut de Química Computacional i Catàlisi (IQCC) and Departament de Química, Universitat de Girona , Campus de Montilivi, 17071 Girona, Spain
| | - Stefano Di Stefano
- Dipartimento di Chimica, Università degli Studi di Roma "La Sapienza" and Istituto CNR di Metodologie Chimiche (IMC-CNR), Sezione Meccanismi di Reazione, c/o Dipartimento di Chimica, Università degli Studi di Roma "La Sapienza", P.le A. Moro 5, I-00185 Rome, Italy.,Consortium of Chemical Catalysis and Reactivity, CIRCC Interuniversity , Via Celso Ulpiani 27, 70126 Bari, Italy
| |
Collapse
|
16
|
Cowan MG, Miller RG, Brooker S. Pyrazine-imide complexes: reversible redox and MOF building blocks. Dalton Trans 2015; 44:2880-92. [DOI: 10.1039/c4dt03407d] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
Stepwise exchange of pyrazine for pyridine, in three bis-heterocycle-based imide ligands, tunes the potential of the [MII/III(ligand)2]0/+ redox couple, increasing the stability of the MII oxidation state by about 0.1 V per exchange.
Collapse
Affiliation(s)
- Matthew G. Cowan
- Department of Chemistry and the MacDiarmid Institute for Advanced Materials and Nanotechnology
- University of Otago
- Dunedin 9054
- New Zealand
| | - Reece G. Miller
- Department of Chemistry and the MacDiarmid Institute for Advanced Materials and Nanotechnology
- University of Otago
- Dunedin 9054
- New Zealand
| | - Sally Brooker
- Department of Chemistry and the MacDiarmid Institute for Advanced Materials and Nanotechnology
- University of Otago
- Dunedin 9054
- New Zealand
| |
Collapse
|
17
|
Ghosh K, Tyagi N, Kumar P, Singh UP. Synthesis, structure, redox properties and DNA interaction studies on mononuclear iron(III) complexes with amidate ligand. Inorganica Chim Acta 2014. [DOI: 10.1016/j.ica.2013.11.034] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
|
18
|
Grau M, Kyriacou A, Cabedo Martinez F, de Wispelaere IM, White AJP, Britovsek GJP. Unraveling the origins of catalyst degradation in non-heme iron-based alkane oxidation. Dalton Trans 2014; 43:17108-19. [DOI: 10.1039/c4dt02067g] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A series of iron(ii) complexes with tetradentate and pentadentate pyridyl amine ligands has been used for the oxidation of cyclohexane with hydrogen peroxide. Ligand degradation is observed under oxidising conditions via oxidative N-dealkylation.
Collapse
Affiliation(s)
- Michaela Grau
- Department of Chemistry
- Imperial College London
- London, UK
| | | | | | | | | | | |
Collapse
|
19
|
Nagao H, Shimura N, Yonezawa H. Formation of bis(2-pyridylcarbonyl)aminate by oxidation of ethylbis(2-pyridylmethyl)amine on the trichloridoruthenium( iii) complex. Dalton Trans 2014; 43:15391-7. [DOI: 10.1039/c4dt01842g] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Oxidation of the facial-type trichloridoruthenium(iii) complex bearing ethylbis(2-pyridylmethyl)amine (ebpma), fac-[RuIIICl3(ebpma)], with (NH4)2[CeIV(NO3)6] in acetonitrile afforded a ruthenium(iii) complex having bis(2-pyridylcarbonyl)aminato (bpca), [RuIIICl2(NCCH3)(bpca)]. The bpca moiety showed interactions with cations such as protons.
Collapse
|
20
|
Rajput A, Mukherjee R. Coordination chemistry with pyridine/pyrazine amide ligands. Some noteworthy results. Coord Chem Rev 2013. [DOI: 10.1016/j.ccr.2012.03.024] [Citation(s) in RCA: 57] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
|
21
|
Iron(II) α-Aminopyridine Complexes and Their Catalytic Activity in Oxidation Reactions: A Comparative Study of Activity and Ligand Decomposition. Chempluschem 2012. [DOI: 10.1002/cplu.201200244] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
|
22
|
Cowan MG, Brooker S. Syntheses, structures and properties of structurally characterised complexes of imide-based ligands. Coord Chem Rev 2012. [DOI: 10.1016/j.ccr.2012.06.004] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
|
23
|
Chen Q, Jiang F, Chen L, Yang M, Hong M. Solvent- and Temperature-Controlled In Situ Ligand Reactions Mediated by CuII and 3′-[(E)-{[(1S,2S)-2-Aminocyclohexyl]imino}methyl]-4′-hydroxy-4-biphenylcarboxlic Acid. Chemistry 2012; 18:9117-24. [DOI: 10.1002/chem.201104001] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2011] [Revised: 03/27/2012] [Indexed: 11/09/2022]
|
24
|
Sahu R, Fulwa VK, Jena HS, Manivannan V. Copper(II) acetate mediated conversion of ortho aminomethyl substituted isoquinolines to bis(isoquinolylcarbonyl)amides. Polyhedron 2012. [DOI: 10.1016/j.poly.2011.10.038] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
|
25
|
Cowan MG, Brooker S. Nine non-symmetric pyrazine-pyridine imide-based complexes: reversible redox and isolation of [MII/III(pypzca)2]0/+when M = Co, Fe. Dalton Trans 2012; 41:1465-74. [DOI: 10.1039/c1dt11128k] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Affiliation(s)
- Matthew G Cowan
- Department of Chemistry and the MacDiarmid Institute for Advanced Materials and Nanotechnology, University of Otago, PO Box 56, Dunedin, 9054, New Zealand
| | | |
Collapse
|
26
|
Kumar P, Roithová J. Mass spectrometric studies of silver complexes with a pyridine dicarboxamide ligand: Interconversion of Ag(I) and Ag(III) oxidation states in the gas phase. EUROPEAN JOURNAL OF MASS SPECTROMETRY (CHICHESTER, ENGLAND) 2012; 18:457-463. [PMID: 23221114 DOI: 10.1255/ejms.1195] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Electrospray ionization (ESI) enables the detection of highly unstable silver(III) complexes prepared in situ from the dicarboxamide ligand L (where L = N,N'-bis(2,6-diisopropylphenyl)-2,6- pyridinedicarboxamide) and Ag(CH(3)COO). The collision-induced dissociation of [Ag(III)(L-H)(CH(3)COO)](+) leads to the elimination of oxiranone. As well as the silver(III) complexes, various other silver(I) complexes generated in the positive as well as negative ionization mode were investigated.
Collapse
Affiliation(s)
- Pramod Kumar
- Department of Organic Chemistry, Faculty of Science, Charles University in Prague, Czech Republic
| | | |
Collapse
|
27
|
Frazier BA, Bartholomew ER, Wolczanski PT, DeBeer S, Santiago-Berrios M, Abruña HD, Lobkovsky EB, Bart SC, Mossin S, Meyer K, Cundari TR. Synthesis and Characterization of (smif)2Mn (n = 0, M = V, Cr, Mn, Fe, Co, Ni, Ru; n = +1, M = Cr, Mn, Co, Rh, Ir; smif =1,3-di-(2-pyridyl)-2-azaallyl). Inorg Chem 2011; 50:12414-36. [DOI: 10.1021/ic200376f] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Brenda A. Frazier
- Department of Chemistry & Chemical Biology, Baker Laboratory, Cornell University, Ithaca, New York 14853, United States
| | - Erika R. Bartholomew
- Department of Chemistry & Chemical Biology, Baker Laboratory, Cornell University, Ithaca, New York 14853, United States
| | - Peter T. Wolczanski
- Department of Chemistry & Chemical Biology, Baker Laboratory, Cornell University, Ithaca, New York 14853, United States
| | - Serena DeBeer
- Department of Chemistry & Chemical Biology, Baker Laboratory, Cornell University, Ithaca, New York 14853, United States
| | - Mitk’El Santiago-Berrios
- Department of Chemistry & Chemical Biology, Baker Laboratory, Cornell University, Ithaca, New York 14853, United States
| | - Hector D. Abruña
- Department of Chemistry & Chemical Biology, Baker Laboratory, Cornell University, Ithaca, New York 14853, United States
| | - Emil B. Lobkovsky
- Department of Chemistry & Chemical Biology, Baker Laboratory, Cornell University, Ithaca, New York 14853, United States
| | - Suzanne C. Bart
- Department of Chemistry & Pharmacy, University of Erlangen-Nuremberg, Egerlandstrasse 1, D-91058 Erlangen, Germany
| | - Susanne Mossin
- Department of Chemistry & Pharmacy, University of Erlangen-Nuremberg, Egerlandstrasse 1, D-91058 Erlangen, Germany
| | - Karsten Meyer
- Department of Chemistry & Pharmacy, University of Erlangen-Nuremberg, Egerlandstrasse 1, D-91058 Erlangen, Germany
| | - Thomas R. Cundari
- Department of Chemistry, Center
for Advanced Scientific Computing and Modeling (CASCaM), University of North Texas, Box 305070, Denton, Texas
76203-5070, United States
| |
Collapse
|
28
|
Synthesis and characterization of new oligomeric and polymeric complexes based on the [CuII(bpca)]+ unit [Hbpca=bis(2-pyridylcarbonyl)amine]. Inorganica Chim Acta 2011. [DOI: 10.1016/j.ica.2011.07.017] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
29
|
Gale EM, Narendrapurapu BS, Simmonett AC, Schaefer HF, Harrop TC. Exploring the Effects of H-Bonding in Synthetic Analogues of Nickel Superoxide Dismutase (Ni-SOD): Experimental and Theoretical Implications for Protection of the Ni−SCys Bond. Inorg Chem 2010; 49:7080-96. [DOI: 10.1021/ic1009187] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Eric M. Gale
- Department of Chemistry and Center for Computational Chemistry, University of Georgia, 1001 Cedar Street, Athens, Georgia 30602
| | - Beulah S. Narendrapurapu
- Department of Chemistry and Center for Computational Chemistry, University of Georgia, 1001 Cedar Street, Athens, Georgia 30602
| | - Andrew C. Simmonett
- Department of Chemistry and Center for Computational Chemistry, University of Georgia, 1001 Cedar Street, Athens, Georgia 30602
| | - Henry F. Schaefer
- Department of Chemistry and Center for Computational Chemistry, University of Georgia, 1001 Cedar Street, Athens, Georgia 30602
| | - Todd C. Harrop
- Department of Chemistry and Center for Computational Chemistry, University of Georgia, 1001 Cedar Street, Athens, Georgia 30602
| |
Collapse
|
30
|
Sahu R, Padhi SK, Jena HS, Manivannan V. Conversion of 2-(aminomethyl) substituted pyridine and quinoline to their dicarbonyldiimides using copper(II) acetate. Inorganica Chim Acta 2010. [DOI: 10.1016/j.ica.2010.01.028] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
|
31
|
Tejel C, del Río M, Ciriano M, Reijerse E, Hartl F, Záliš S, Hetterscheid D, Tsichlis i Spithas N, de Bruin B. Ligand-Centred Reactivity of Bis(picolyl)amine Iridium: Sequential Deprotonation, Oxidation and Oxygenation of a “Non-Innocent” Ligand. Chemistry 2009; 15:11878-89. [DOI: 10.1002/chem.200901017] [Citation(s) in RCA: 56] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
|
32
|
Sanz Miguel PJ, Roitzsch M, Yin L, Lax PM, Holland L, Krizanovic O, Lutterbeck M, Schürmann M, Fusch EC, Lippert B. On the many roles of NH3 ligands in mono- and multinuclear complexes of platinum. Dalton Trans 2009:10774-86. [PMID: 20023907 DOI: 10.1039/b916537a] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The role of the NH(3) ligands in the highly successful antitumour agents cisplatin and carboplatin is not fully understood. Suggestions that the ammonia ligands are involved in target recognition through hydrogen bond formation, e.g. with guanine-O6, have been questioned. Here, we review the roles and functions of NH(3) ligands of cis-PtCl(2)(NH(3))(2) and likewise of its trans-isomer in complexes with model nucleobases as well as other N-heterocyclic ligands. Specifically, their roles in hydrogen bonding interactions with nucleobases as well as anions, the influence on acid-base properties of co-ligands, their involvement in condensation reactions, as well as a variety of displacement reactions will be examined. As a result, it can be stated that the ammonia ligands in cis- and trans-Pt(II)(NH(3))(2) entities display additional features to those generally discussed in the last four decades since the discovery of the antitumour activity of cisplatin.
Collapse
|
33
|
Hellyer RM, Larsen DS, Brooker S. Cobalt and Silver Complexes of Terdentate Pyrazine-Based Amide Ligands and Assembly of Monocobalt Building Blocks through a Silver Connector. Eur J Inorg Chem 2009. [DOI: 10.1002/ejic.200801187] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
|
34
|
Tejel C, Ciriano M, del Río M, Hetterscheid D, Tsichlis i Spithas N, Smits J, de Bruin B. Ligand Oxidation of a Deprotonated Bis(picolyl)amine IrI(cod) Complex. Chemistry 2008; 14:10932-6. [DOI: 10.1002/chem.200801162] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
|
35
|
Tejel C, Ciriano MA, del Río MP, van den Bruele FJ, Hetterscheid DGH, Tsichlis i Spithas N, de Bruin B. Deprotonation Induced Ligand-to-Metal Electron Transfer: Synthesis of a Mixed-Valence Rh(−I,I) Dinuclear Compound and Its Reaction with Dioxygen. J Am Chem Soc 2008; 130:5844-5. [DOI: 10.1021/ja711495v] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Cristina Tejel
- Departamento de Química Inorgánica, Instituto de Ciencia de Materiales de Aragón, CSIC-Universidad de Zaragoza, Pedro Cerbuna 12, E-50009 Zaragoza, Spain, and Homogeneous and Supramolecular Catalysis, Vanʼt Hoff Institute for Molecular Sciences, University of Amsterdam, Nieuwe Achtergracht 166, 1018 WV Amsterdam, The Netherlands
| | - Miguel A. Ciriano
- Departamento de Química Inorgánica, Instituto de Ciencia de Materiales de Aragón, CSIC-Universidad de Zaragoza, Pedro Cerbuna 12, E-50009 Zaragoza, Spain, and Homogeneous and Supramolecular Catalysis, Vanʼt Hoff Institute for Molecular Sciences, University of Amsterdam, Nieuwe Achtergracht 166, 1018 WV Amsterdam, The Netherlands
| | - M. Pilar del Río
- Departamento de Química Inorgánica, Instituto de Ciencia de Materiales de Aragón, CSIC-Universidad de Zaragoza, Pedro Cerbuna 12, E-50009 Zaragoza, Spain, and Homogeneous and Supramolecular Catalysis, Vanʼt Hoff Institute for Molecular Sciences, University of Amsterdam, Nieuwe Achtergracht 166, 1018 WV Amsterdam, The Netherlands
| | - Fieke J. van den Bruele
- Departamento de Química Inorgánica, Instituto de Ciencia de Materiales de Aragón, CSIC-Universidad de Zaragoza, Pedro Cerbuna 12, E-50009 Zaragoza, Spain, and Homogeneous and Supramolecular Catalysis, Vanʼt Hoff Institute for Molecular Sciences, University of Amsterdam, Nieuwe Achtergracht 166, 1018 WV Amsterdam, The Netherlands
| | - Dennis G. H. Hetterscheid
- Departamento de Química Inorgánica, Instituto de Ciencia de Materiales de Aragón, CSIC-Universidad de Zaragoza, Pedro Cerbuna 12, E-50009 Zaragoza, Spain, and Homogeneous and Supramolecular Catalysis, Vanʼt Hoff Institute for Molecular Sciences, University of Amsterdam, Nieuwe Achtergracht 166, 1018 WV Amsterdam, The Netherlands
| | - Nearchos Tsichlis i Spithas
- Departamento de Química Inorgánica, Instituto de Ciencia de Materiales de Aragón, CSIC-Universidad de Zaragoza, Pedro Cerbuna 12, E-50009 Zaragoza, Spain, and Homogeneous and Supramolecular Catalysis, Vanʼt Hoff Institute for Molecular Sciences, University of Amsterdam, Nieuwe Achtergracht 166, 1018 WV Amsterdam, The Netherlands
| | - Bas de Bruin
- Departamento de Química Inorgánica, Instituto de Ciencia de Materiales de Aragón, CSIC-Universidad de Zaragoza, Pedro Cerbuna 12, E-50009 Zaragoza, Spain, and Homogeneous and Supramolecular Catalysis, Vanʼt Hoff Institute for Molecular Sciences, University of Amsterdam, Nieuwe Achtergracht 166, 1018 WV Amsterdam, The Netherlands
| |
Collapse
|
36
|
Bates GW, Gale PA, Light ME, Ogden MI, Warriner CN. Structural diversity in the first metal complexes of 2,5-dicarboxamidopyrroles and 2,5-dicarbothioamidopyrroles. Dalton Trans 2008:4106-12. [DOI: 10.1039/b802506a] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
37
|
The design and synthesis of pyrazine amide ligands suitable for the “tiles” approach to molecular weaving with octahedral metal ions. INORG CHEM COMMUN 2008. [DOI: 10.1016/j.inoche.2007.10.006] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
|
38
|
Howell SJ, Day CS, Noftle RE. Metal Complexes of 3-Thiophene Carboxamides Containing a Pyridine Ring. Inorganica Chim Acta 2007; 360:2669-2680. [PMID: 18516222 PMCID: PMC2245882 DOI: 10.1016/j.ica.2007.01.003] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
Complexes of Zn(II), Cu(II) and Co(II) with either N-(2-methylpyridyl)-3-thienyl-alkyl-carboxamide or N-(2-pyridyl)-3-thienylalkyl-carboxamide groups have been prepared and characterized. Crystal structures of ten new complexes are reported and discussed. N-(2-Methylpyridyl)-3-thienyl-alkyl-carboxamide exhibits both uni- and bidentate behavior. With all ligands, bidentate complexation is through the carbonyl oxygen and pyridine nitrogen atoms (O, N) and the amide nitrogen atom remains protonated. The electrochemical behavior and the infrared spectra of selected complexes are discussed.
Collapse
Affiliation(s)
- S Jarrett Howell
- Department of Chemistry, Wake Forest University, Winston-Salem, NC 27109, USA
| | | | | |
Collapse
|
39
|
Affiliation(s)
- Andrew N. Dwyer
- a School of Chemistry , University of Southampton , Southampton, UK
| | | | - Peter N. Horton
- a School of Chemistry , University of Southampton , Southampton, UK
| |
Collapse
|
40
|
Medlycott EA, Hanan GS. Minimal structural reorganisation in the electrochemical oxidation of a dinuclear, double helical Cu(i) complex of a triazine-based pentadentate ligand. Chem Commun (Camb) 2007:4884-6. [DOI: 10.1039/b711765e] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
41
|
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]
|
42
|
Harrop TC, Olmstead MM, Mascharak PK. Modeling the Active Site of Nitrile Hydratase: Synthetic Strategies to Ensure Simultaneous Coordination of Carboxamido-N and Thiolato-S to Fe(III) Centers. Inorg Chem 2005; 44:9527-33. [PMID: 16323940 DOI: 10.1021/ic051183z] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A general strategy for synthesizing Fe(III) complexes of ligands containing carboxamido-N and thiolato-S donors has been described. Reaction of the doubly deprotonated ligand PyPepS2- (where PyPepSH2=N-2-mercaptophenyl-2'-pyridinecarboxamide) with Fe(III) salts in DMF had previously afforded the Fe(III) complex (Et4N)[Fe(PyPepS)2] without any problem(s) associated with autoredox reactions of the thiolate functionality. In the present work, similar reactions with the doubly deprotonated ligand PiPepS2- (where PiPepSH2=2-mercapto-N-pyridin-2-yl-methylbenzamide) with Fe(III) salts, however, fail to afford any Fe(III) complex because of autoredox reactions. The break in the conjugation in the PiPepSH2 ligand frame is the key reason for this difference in behavior between these two very similar ligands. This is demonstrated by the fact that the same reaction with AqPepS2- (where AqPepSH2=2-mercapto-N-quinolin-8-yl-benzamide), another ligand with extended conjugation, affords the Fe(III) complex (Et4N)[Fe(AqPepS)2] without any synthetic complication. It is therefore evident that ligands in which the carboxamide and thiolate functionalities are kept in conjugation could be used to isolate Fe(III) complexes with carboxamido-N and thiolato-S coordination. This finding will be very helpful in future research work in the area of modeling the active site of Fe-containing nitrile hydratase.
Collapse
Affiliation(s)
- Todd C Harrop
- Department of Chemistry and Biochemistry, University of California, Santa Cruz, California 95064, USA
| | | | | |
Collapse
|
43
|
Howell SJ, Day CS, Noftle RE. Synthesis and characterization of 3-thiophene carboxamides containing a pyridine ring: structure, electrochemistry, and complexation. Inorganica Chim Acta 2005. [DOI: 10.1016/j.ica.2005.05.008] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
|
44
|
Tanase S, Gallego PM, Bouwman E, de Gelder R, Reedijk J. A new polymeric copper(II) complex containing pyrazine-2-carboxyamide (pzca): Synthesis and crystal structure of {[Cu(pzca)(CH3CN)3](ClO4)2·H2O}n. INORG CHEM COMMUN 2005. [DOI: 10.1016/j.inoche.2005.05.004] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
|
45
|
Kumar Singh A, Mukherjee R. Structure and properties of bivalent nickel and copper complexes with pyrazine-amide-thioether coordination: stabilization of trivalent nickel. Dalton Trans 2005:2886-91. [PMID: 16094477 DOI: 10.1039/b504893a] [Citation(s) in RCA: 57] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Acyclic pyrazine-2-carboxamide and thioether containing hexadentate ligand 1,4-bis[o-(pyrazine-2-carboxamidophenyl)]-1,4-dithiobutane (H(2)bpzctb), in its deprotonated form, has afforded light brown [Ni(II)(bpzctb)](1)(S=1) and green [Cu(II)(bpzctb)](2)(S=1/2) complexes. The crystal structures of 1.CH(3)OH and 2.CH(2)Cl(2) revealed that in these complexes the ligand coordinates in a hexadentate mode, affording examples of distorted octahedral M(II)N(2)(pyrazine)N'(2)(amide)S(2)(thioether) coordination. Each complex exhibits in CH(2)Cl(2) a reversible to quasireversible cyclic voltammetric response, corresponding to the Ni(III)/Ni(II)(1) and Cu(II)/Cu(I)(2) redox process. The E(1/2) values reveal that the complexes of bpzctb(2-) are uniformly more anodic by approximately 0.2 V than those of the corresponding complexes with the analogous pyridine ligand, 1,4-bis[o-(pyridine-2-carboxamidophenyl)]-1,4-dithiobutane (H(2)bpctb), attesting that compared to pyridine, pyrazine is a better stabilizer of the Ni(ii) or Cu(i) state. Coulometric oxidation of the previously reported complex [Ni(II)(bpctb)] and 1 generates [Ni(III)(bpctb)](+) and [Ni(III)(bpzctb)](+) species, which exhibit a LMCT transition in the 470--480 nm region and axial EPR spectra corresponding to a tetragonally elongated octahedral geometry. Complex 2 exhibits EPR spectra characteristic of the d(z(2)) ground state.
Collapse
Affiliation(s)
- Akhilesh Kumar Singh
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur 208 016, India
| | | |
Collapse
|
46
|
Jitsukawa K, Takahashi H, Hyuga R, Arii H, Masuda H. Sequence‐Specific Oxidative Degradation of Tripeptides by a Cobalt(
III
) Complex Containing a Terpyridine Ligand. Eur J Inorg Chem 2004. [DOI: 10.1002/ejic.200400261] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Koichiro Jitsukawa
- Nagoya Institute of Technology, Gokiso‐cho, Showa‐ku Nagoya 466‐8555, Japan, Fax: +81‐52‐7355240
| | - Hiroshi Takahashi
- Nagoya Institute of Technology, Gokiso‐cho, Showa‐ku Nagoya 466‐8555, Japan, Fax: +81‐52‐7355240
| | - Ryoji Hyuga
- Nagoya Institute of Technology, Gokiso‐cho, Showa‐ku Nagoya 466‐8555, Japan, Fax: +81‐52‐7355240
| | - Hidekazu Arii
- Nagoya Institute of Technology, Gokiso‐cho, Showa‐ku Nagoya 466‐8555, Japan, Fax: +81‐52‐7355240
| | - Hideki Masuda
- Nagoya Institute of Technology, Gokiso‐cho, Showa‐ku Nagoya 466‐8555, Japan, Fax: +81‐52‐7355240
| |
Collapse
|
47
|
Pardo E, Lloret F, Carrasco R, Muñoz M, Temporal-Sánchez T, Ruiz-Garcı́a R. Chemistry and reactivity of dinuclear iron oxamate complexes: alkane oxidation with hydrogen peroxide catalysed by an oxo-bridged diiron(III) complex with amide and carboxylate ligation. Inorganica Chim Acta 2004. [DOI: 10.1016/j.ica.2004.02.023] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
|
48
|
Hausmann J, Brooker S. Control of molecular architecture by use of the appropriate ligand isomer: a mononuclear “corner-type” versus a tetranuclear [2 × 2] grid-type cobalt(iii) complex. Chem Commun (Camb) 2004:1530-1. [PMID: 15216365 DOI: 10.1039/b403905j] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Employing two isomeric pyrazine-based ligands a [2 x 2] grid-type tetranuclear cobalt(III) complex, incorporating doubly deprotonated (La)2- ligands, and a "corner-type" mononuclear cobalt(III) complex, incorporating neutral H2Lp ligands in a zwitterionic form, have been synthesised and structurally characterised.
Collapse
Affiliation(s)
- Julia Hausmann
- Department of Chemistry, University of Otago, PO Box 56, Dunedin, New Zealand
| | | |
Collapse
|
49
|
Bukowski MR, Zhu S, Koehntop KD, Brennessel WW, Que L. Characterization of an FeIII-OOH species and its decomposition product in a bleomycin model system. J Biol Inorg Chem 2003; 9:39-48. [PMID: 14564557 DOI: 10.1007/s00775-003-0494-z] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2003] [Accepted: 09/18/2003] [Indexed: 10/26/2022]
Abstract
To model the mononuclear Fe(III)-OOH species identified in the catalytic cycle of the anticancer drug bleomycin, the iron chemistry of the pentadentate ligand N-[bis(2-pyridylmethyl)aminoethyl]pyridine-2-carboxamide (H-PaPy(3)) has been investigated. The complex [Fe(III)(PaPy(3))OCH(3)](ClO(4)) was reacted with H(2)O(2) to form a red species (lambda(max)=480 nm, epsilon=1800 M(-1) cm(-1)) with an S=1/2 EPR signal at g=2.25, 2.17, and 1.95. This species has been identified by electrospray ionization mass spectrometry as [Fe(III)(PaPy(3))OOH](ClO(4)) and further characterized by resonance Raman and EXAFS analysis. The decomposition of this intermediate leads to the modification of the ligand, as revealed by (1)H NMR. One hydrogen atom is substituted by a solvent-derived methoxy group. The substitution at this site is a result of the two-electron oxidation of the ligand following the heterolytic cleavage of the O-O bond of the Fe(III)-OOH species. This is a plausible mechanism to rationalize related ligand modifications that have been proposed in the decay of activated bleomycin.
Collapse
Affiliation(s)
- Michael R Bukowski
- Department of Chemistry and Center for Metals in Biocatalysis, University of Minnesota, Minneapolis, MN 55455, USA
| | | | | | | | | |
Collapse
|
50
|
|