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Marvelous C, Siegler MA, Bouwman E. Structural investigations and reactivity of cobalt(II)–disulfide compounds. Inorganica Chim Acta 2022. [DOI: 10.1016/j.ica.2022.121193] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Marvelous C, de Azevedo Santos L, Siegler MA, Fonseca Guerra C, Bouwman E. Redox Conversion of Cobalt(II)‐Diselenide to Cobalt(III)‐Selenolate Compounds: Comparison with Their Sulfur Analogs. Eur J Inorg Chem 2022. [DOI: 10.1002/ejic.202200445] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Christian Marvelous
- Leiden Institute of Chemistry Leiden University P.O. Box 9502 2300 RA Leiden, The Netherlands
| | - Lucas de Azevedo Santos
- Department of Theoretical Chemistry, Amsterdam Center for Multiscale Modelling (ACMM) Vrije Universiteit Amsterdam De Boelelaan 1083 1081 HV Amsterdam, The Netherlands
| | - Maxime A. Siegler
- Department of Chemistry Johns Hopkins University 3400 N. Charles Street Baltimore Maryland 21218 United States
| | - Célia Fonseca Guerra
- Leiden Institute of Chemistry Leiden University P.O. Box 9502 2300 RA Leiden, The Netherlands
- Department of Theoretical Chemistry, Amsterdam Center for Multiscale Modelling (ACMM) Vrije Universiteit Amsterdam De Boelelaan 1083 1081 HV Amsterdam, The Netherlands
| | - Elisabeth Bouwman
- Leiden Institute of Chemistry Leiden University P.O. Box 9502 2300 RA Leiden, The Netherlands
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Marvelous C, de Azevedo Santos L, Siegler MA, Fonseca Guerra C, Bouwman E. Cleaner and stronger: how 8-quinolinolate facilitates formation of Co(III)-thiolate from Co(II)-disulfide complexes. Dalton Trans 2022; 51:11675-11684. [PMID: 35848449 DOI: 10.1039/d2dt02106d] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The formation of Co(III)-thiolate complexes from Co(II)-disulfide complexes using the anionic ligand 8-quinolinolate (quin-) has been studied experimentally and quantum chemically. Two Co(II)-disulfide complexes [Co2(LxSSLx)(Cl)4] (x = 1 or 2; L1SSL1 = 2,2'-disulfanediylbis(N,N-bis(pyridin-2-ylmethyl)ethan-1-amine; L2SSL2 = 2,2'-disulfanedylbis (N-((6-methylpyridin-2-yl)methyl)-N-(pyridin-2-ylmethyl) ethan-1-amine) have been successfully converted with high yield to their corresponding Co(III)-thiolate complexes upon addition of the ligand 8-quinolinolate. Using density functional theory (DFT) computations the d-orbital splitting energies of the cobalt-thiolate compounds [Co(L1S)(quin)]+ and [Co(L2S)(quin)]+ were estimated to be 3.10 eV and 3.07 eV, indicating a slightly smaller ligand-field strength of ligand L2SSL2 than of L1SSL1. Furthermore, the orientation of the quin- ligand in the thiolate compounds determines the stability of the thiolate complex. DFT computations show that the thiolate structure benefits from more electrostatic attraction when the oxygen atom of the quin- ligand is positioned trans to the sulfur atom of the [Co(L1S)]2+ fragment. Quin- is the first auxiliary ligand with which it appeared possible to induce the redox-conversion reaction in cobalt(II) compounds of the relatively weak-field ligand L2SSL2.
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Affiliation(s)
- Christian Marvelous
- Leiden Institute of Chemistry, Gorlaeus Laboratories, Leiden University, P.O. Box 9502, 2300 RA Leiden, The Netherlands.
| | - Lucas de Azevedo Santos
- Department of Theoretical Chemistry, Amsterdam Institute of Molecular and Life Sciences (AIMMS), Amsterdam Center for Multiscale Modelling (ACMM), Vrije Universiteit Amsterdam, De Boelelaan 1083, 1081 HV Amsterdam, The Netherlands
| | - Maxime A Siegler
- Department of Chemistry, Johns Hopkins University, 3400 N. Charles Street, Baltimore, Maryland 21218, USA
| | - Célia Fonseca Guerra
- Leiden Institute of Chemistry, Gorlaeus Laboratories, Leiden University, P.O. Box 9502, 2300 RA Leiden, The Netherlands. .,Department of Theoretical Chemistry, Amsterdam Institute of Molecular and Life Sciences (AIMMS), Amsterdam Center for Multiscale Modelling (ACMM), Vrije Universiteit Amsterdam, De Boelelaan 1083, 1081 HV Amsterdam, The Netherlands
| | - Elisabeth Bouwman
- Leiden Institute of Chemistry, Gorlaeus Laboratories, Leiden University, P.O. Box 9502, 2300 RA Leiden, The Netherlands.
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Jana RD, Chakraborty B, Paria S, Ohta T, Singh R, Mandal S, Paul S, Itoh S, Paine TK. Dioxygen Activation and Mandelate Decarboxylation by Iron(II) Complexes of N4 Ligands: Evidence for Dioxygen-Derived Intermediates from Cobalt Analogues. Inorg Chem 2022; 61:10461-10476. [PMID: 35759790 DOI: 10.1021/acs.inorgchem.2c01308] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The isolation, characterization, and dioxygen reactivity of monomeric [(TPA)MII(mandelate)]+ (M = Fe, 1; Co, 3) and dimeric [(BPMEN)2MII2(μ-mandelate)2]2+ (M = Fe, 2; Co, 4) (TPA = tris(2-pyridylmethyl)amine and BPMEN = N1,N2-dimethyl-N1,N2-bis(pyridin-2-yl-methyl)ethane-1,2-diamine) complexes are reported. The iron(II)- and cobalt(II)-mandelate complexes react with dioxygen to afford benzaldehyde and benzoic acid in a 1:1 ratio. In the reactions, one oxygen atom from dioxygen is incorporated into benzoic acid, but benzaldehyde does not derive any oxygen atom from dioxygen. While no O2-derived intermediate is observed with the iron(II)-mandelate complexes, the analogous cobalt(II) complexes react with dioxygen at a low temperature (-80 °C) to generate the corresponding cobalt(III)-superoxo species (S), a key intermediate implicated in the initiation of mandelate decarboxylation. At -20 °C, the cobalt(II)-mandelate complexes bind dioxygen reversibly leading to the formation of μ-1,2-peroxo-dicobalt(III)-mandelate species (P). The geometric and electronic structures of the O2-derived intermediates (S and P) have been established by computational studies. The intermediates S and P upon treatment with a protic acid undergo decarboxylation to afford benzaldehyde (50%) with a concomitant formation of the corresponding μ-1,2-peroxo-μ-mandelate-dicobalt(III) (P1) species. The crystal structure of a peroxide species isolated from the cobalt(II)-carboxylate complex [(TPA)CoII(MPA)]+ (5) (MPA = 2-methoxyphenylacetate) supports the composition of P1. The observations of the dioxygen-derived intermediates from cobalt complexes and their electronic structure analyses not only provide information about the nature of active species involved in the decarboxylation of mandelate but also shed light on the mechanistic pathway of two-electron versus four-electron reduction of dioxygen.
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Affiliation(s)
- Rahul Dev Jana
- School of Chemical Sciences, Indian Association for the Cultivation of Science, 2A & 2B Raja S.C. Mullick Road, Jadavpur, Kolkata 700032, India
| | - Biswarup Chakraborty
- School of Chemical Sciences, Indian Association for the Cultivation of Science, 2A & 2B Raja S.C. Mullick Road, Jadavpur, Kolkata 700032, India
| | - Sayantan Paria
- Department of Molecular Chemistry, Division of Applied Chemistry, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Takehiro Ohta
- Picobiology Institute, Graduate School of Life Science, University of Hyogo, RSC-UH LP Center, Koto 1-1-1, Sayo-cho, Sayo-gun, Hyogo 679-5148, Japan
| | - Reena Singh
- School of Chemical Sciences, Indian Association for the Cultivation of Science, 2A & 2B Raja S.C. Mullick Road, Jadavpur, Kolkata 700032, India
| | - Sourav Mandal
- School of Chemical Sciences, Indian Association for the Cultivation of Science, 2A & 2B Raja S.C. Mullick Road, Jadavpur, Kolkata 700032, India
| | - Satadal Paul
- Department of Chemistry, Bangabasi Morning College, 19, Rajkumar Chakraborty Sarani, Kolkata 700009, India
| | - Shinobu Itoh
- Department of Molecular Chemistry, Division of Applied Chemistry, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Tapan Kanti Paine
- School of Chemical Sciences, Indian Association for the Cultivation of Science, 2A & 2B Raja S.C. Mullick Road, Jadavpur, Kolkata 700032, India
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Ren YY, Xia W, Deng BY, Liu J, Wang F. Host-guest assemblies of anchoring molecular catalysts of CO2 reduction onto CuInS2/ZnS quantum dots for robust photocatalytic syngas production in water. MOLECULAR CATALYSIS 2022. [DOI: 10.1016/j.mcat.2022.112168] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Misawa-Suzuki T, Ikeda R, Komatsu R, Toriba R, Miyamoto R, Nagao H. Geometry and Electronic Structures of Cobalt(II) and Iron(III) Complexes Bearing Bis(2-pyridylmethyl)ether or Alkylbis(2-pyridylmethyl)amine. Polyhedron 2022. [DOI: 10.1016/j.poly.2022.115735] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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7
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Mudoi PP, Choudhury A, Li Y, Lescouëzec R, Marimuthu R, Gogoi N. Observation of Protonation-Induced Spin State Switching in a Cyanido-Bridged {Fe 2Co 2} Molecular Square. Inorg Chem 2021; 60:17705-17714. [PMID: 34751574 DOI: 10.1021/acs.inorgchem.1c02302] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The self-assembly of [Co(MeTPyA)(CH3COO)]PF6 (1) and [Fe(bbp)(CN)3]2- affords a cyanido-bridged square-shaped {Fe2Co2} tetranuclear complex, [{Co(MeTPyA)(μ2-NC)2Fe(bbp)(CN)}2]·3H2O (2; MeTPyA = tris((3,5-dimethylpyrazol-1-yl)methyl)amine and H2bbp = bis(2-benzimidazolyl)pyridine). The possibility of inducing an intramolecular electron transfer coupled spin transition in 2 by employing protonation as an external stimulant is explored. UV-visible spectrophotometric measurements, electrochemical and 1H NMR studies establish that a reversible intramolecular electron transfer coupled spin transition can be triggered in 2 upon addition of either acid or base.
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Affiliation(s)
- Prashurya Pritam Mudoi
- Department of Chemical Sciences, Tezpur University, Napaam 784028, Sonitpur, Assam, India
| | - Anup Choudhury
- Department of Chemical Sciences, Tezpur University, Napaam 784028, Sonitpur, Assam, India
| | - Yanling Li
- Institut Parisien de Chimie Moléculaire-CNRS UMR 8232, Sorbonne Université, 4 place Jussieu, 75252 Paris cedex 05, France
| | - Rodrigue Lescouëzec
- Institut Parisien de Chimie Moléculaire-CNRS UMR 8232, Sorbonne Université, 4 place Jussieu, 75252 Paris cedex 05, France
| | - Rajendiran Marimuthu
- Organometallics and Materials Chemistry Lab, Department of Chemistry, Indian Institute of Technology Bombay, Mumbai 400076, India
| | - Nayanmoni Gogoi
- Department of Chemical Sciences, Tezpur University, Napaam 784028, Sonitpur, Assam, India
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Sharma P, Dutta D, Gomila RM, Frontera A, Barcelo-Oliver M, Verma AK, Bhattacharyya MK. Benzoato bridged dinuclear Mn(II) and Cu(II) compounds involving guest chlorobenzoates and dimeric paddle wheel supramolecular assemblies: Antiproliferative evaluation and theoretical studies. Polyhedron 2021. [DOI: 10.1016/j.poly.2021.115409] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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Sharma P, Sarma P, Frontera A, Hussain S, Verma AK, Bhattacharyya MK. Energetically significant anti-parallel π-stacking and unconventional anion-π interactions in phenanthroline based Ni(II) and Cu(II) coordination compounds: Antiproliferative evaluation and theoretical studies. Inorganica Chim Acta 2021. [DOI: 10.1016/j.ica.2020.120082] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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Kumar P, SantaLucia DJ, Kaniewska-Laskowska K, Lindeman SV, Ozarowski A, Krzystek J, Ozerov M, Telser J, Berry JF, Fiedler AT. Probing the Magnetic Anisotropy of Co(II) Complexes Featuring Redox-Active Ligands. Inorg Chem 2020; 59:16178-16193. [DOI: 10.1021/acs.inorgchem.0c01812] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Praveen Kumar
- Department of Chemistry, Marquette University, Milwaukee, Wisconsin 53201, United States
| | - Daniel J. SantaLucia
- Department of Chemistry, University of Wisconsin−Madison, Madison, Wisconsin 53706, United States
| | - Kinga Kaniewska-Laskowska
- Department of Inorganic Chemistry, Faculty of Chemistry, Gdańsk University of Technology, Gdańsk PL-80-233, Poland
| | - Sergey V. Lindeman
- Department of Chemistry, Marquette University, Milwaukee, Wisconsin 53201, United States
| | - Andrew Ozarowski
- National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310, United States
| | - J. Krzystek
- National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310, United States
| | - Mykhaylo Ozerov
- National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310, United States
| | - Joshua Telser
- Department of Biological, Chemical and Physical Sciences, Roosevelt University, Chicago, Illinois 60605, United States
| | - John F. Berry
- Department of Chemistry, University of Wisconsin−Madison, Madison, Wisconsin 53706, United States
| | - Adam T. Fiedler
- Department of Chemistry, Marquette University, Milwaukee, Wisconsin 53201, United States
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11
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Five-Coordinated Geometries from Molecular Structures to Solutions in Copper(II) Complexes Generated from Polydentate- N-Donor Ligands and Pseudohalides. Molecules 2020; 25:molecules25153376. [PMID: 32722383 PMCID: PMC7436159 DOI: 10.3390/molecules25153376] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2020] [Revised: 07/22/2020] [Accepted: 07/23/2020] [Indexed: 11/17/2022] Open
Abstract
A novel series of mononuclear five-coordinated pseudohalido-Cu(II) complexes displaying distorted square bipyramidal: [Cu(L1)(NCS)2] (1), [Cu(L2)(NCS)2] (2) and [Cu(L3)(NCS)]ClO4 (5) as well as distorted trigonal bipyramidal: [Cu(isp3tren)(N3)]ClO4 (3), [Cu(isp3tren)(dca)]ClO4 (4) and [Cu(tedmpza)(dca)]ClO4·0.67H2O (6) geometries had been synthesized and structurally characterized using X-ray single crystal crystallography, elemental microanalysis, IR and UV-vis spectroscopy, and molar conductivity measurements. Different N-donor amine skeletons including tridentate: L1 = [(2-pyridyl)-2-ethyl)-(3,4-dimethoxy)-2-methylpyridyl]methylamine and L2 = [(2-pyridyl)-2-ethyl)-(3,5-dimethyl-4-methoxy)-2-methyl-pyridyl]methylamine, and tetradentate: L3 = bis(2-ethyl-di(3,5-dimethyl-1H-pyrazol-1-yl)-[2-(3,4-dimethoxy-pyridylmethyl)]amine, tedmpza = tris[(2-(3,5-dimethyl-1H-pyrazol-1-yl)ethyl]amine and isp3tren = tris[(2-isopropylamino)ethyl)]amine ligands were employed. Molecular structural parameters such as nature of coligand, its chelate ring size and steric environment incorporated into its skeleton, which lead to adopting one of the two limiting geometries in these complexes and other reported compounds are analyzed and correlated to their assigned geometries in solutions. Similar analysis were extended to other five-coordinated halido-Cu(II) complexes.
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Naveen P, Vijaya Pandiyan B, Anu D, Dallemer F, Kolandaivel P, Prabhakaran R. A pseudo trinuclear nickel–sodium complex containing tris(8‐methyl‐2‐oxo‐quinolidineamino ethylamine): Synthesis, spectral characterization, X‐ray crystallography and in vitrobiological evaluations. Appl Organomet Chem 2020. [DOI: 10.1002/aoc.5605] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- P. Naveen
- Department of ChemistryBharathiar University Coimbatore 641 046 India
| | | | - D. Anu
- Department of ChemistryBharathiar University Coimbatore 641 046 India
| | - F. Dallemer
- LaboratoireChimie Provence‐CNRS, UMR7246Université of Aix‐Marseille, Campus Scientifique de Saint‐Jérôme, Avenue Escadrille Normandie‐Niemen F‐13397 Marseille Cedex 20 France
| | - P. Kolandaivel
- Department of PhysicsBharathiar University Coimbatore 641046 India
| | - R. Prabhakaran
- Department of ChemistryBharathiar University Coimbatore 641 046 India
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13
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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.
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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.
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14
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Anjana SS, Varghese B, Murthy NN. Coligand modulated oxidative O-demethylation of a methyl ether appended tetradentate N-ligand in Co(ii) complexes. Dalton Trans 2020; 49:3187-3197. [PMID: 31967148 DOI: 10.1039/c9dt04609g] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Two Co(ii) complexes of the formula CoLOMeX2 (X = Cl- (1a); X = I- (1b)), where LOMe is 2-methoxy-N,N-bis(pyridin-2-ylmethyl) aniline, were synthesized and their structure, spectra and reactivity were studied. Upon oxidation of 1a and 1b, the ligand LOMe undergoes demethylation at the metal centre resulting in the formation of Co(iii) complexes with modified phenoxide ligands. This is the very first example of oxidative O-demethylation reported at a Co(ii) centre. The oxidative behaviour exhibits a striking dependence on the nature of coligands coordinated to the metal centre. The Co(ii) complex 1a with stronger chloro coligands requires a strong oxidising agent like t-BuOOH for oxidative demethylation and the subsequent formation of a mononuclear Co(iii) complex with a demethylated ligand, CoLO-Cl2 (2). On the other hand, complex 1b with weaker iodo coligands undergoes oxidation in the presence of the weak oxidant O2 to form a dihydroxo bridged binuclear Co(iii) complex [Co2(LO-)2(OH)2]2+ (3) with modified phenoxide ligands. The oxidation of 1b to 3 is monitored and the intermediate Co(ii) iodo aqua complex [CoLOMeI(H2O)]+ and Co(ii) diaqua complex [CoLOMe(H2O)2]2+ are isolated and characterised.
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Affiliation(s)
- S S Anjana
- Department of Chemistry, IIT Madras, Chennai 600 036, India.
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15
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Dutta D, Sharma P, Frontera A, Gogoi A, Verma AK, Dutta D, Sarma B, Bhattacharyya MK. Oxalato bridged coordination polymer of manganese( iii) involving unconventional O⋯π-hole(nitrile) and antiparallel nitrile⋯nitrile contacts: antiproliferative evaluation and theoretical studies. NEW J CHEM 2020. [DOI: 10.1039/d0nj03712e] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
Unconventional O⋯π-hole(nitrile) and antiparallel nitrile⋯nitrile contacts have been theoretically investigated for a Mn(iii) coordination polymer considering cytotoxicity, apoptosis, ROS generation, molecular docking and pharmacophore features.
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Affiliation(s)
- Debajit Dutta
- Department of Chemistry
- Cotton University
- Guwahati-781001
- India
| | - Pranay Sharma
- Department of Chemistry
- Cotton University
- Guwahati-781001
- India
| | - Antonio Frontera
- Departament de Química
- Universitat de les Illes Balears
- 07122 Palma de Mallorca (Baleares)
- Spain
| | - Anshuman Gogoi
- Department of Chemistry
- Cotton University
- Guwahati-781001
- India
| | - Akalesh K. Verma
- Department of Zoology
- Cell & Biochemical Technology Laboratory
- Cotton University
- Guwahati 781001
- India
| | - Diksha Dutta
- Department of Zoology
- Cell & Biochemical Technology Laboratory
- Cotton University
- Guwahati 781001
- India
| | - Bipul Sarma
- Department of Chemical Sciences
- Tezpur University
- Tezpur 784028
- India
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16
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Bhattacharyya MK, Saha U, Dutta D, Frontera A, Verma AK, Sharma P, Das A. Unconventional DNA-relevant π-stacked hydrogen bonded arrays involving supramolecular guest benzoate dimers and cooperative anion–π/π–π/π–anion contacts in coordination compounds of Co(ii) and Zn(ii) phenanthroline: experimental and theoretical studies. NEW J CHEM 2020. [DOI: 10.1039/c9nj05727g] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Antiproliferative evaluation and supramolecular assemblies of Co(ii) and Zn(ii) coordination compounds involving cooperative anion–π and unconventional DNA-relevant π-stacked hydrogen bonded arrays.
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Affiliation(s)
| | - Utpal Saha
- Department of Chemistry
- Cotton University
- Guwahati 781001
- India
| | - Debajit Dutta
- Department of Chemistry
- Cotton University
- Guwahati 781001
- India
| | - Antonio Frontera
- Departament de Química
- Universitat de les Illes Balears
- Crta de Valldemossa km 7.7
- 07122 Palma de Mallorca (Baleares)
- Spain
| | - Akalesh K. Verma
- Department of Zoology
- Cell & Biochemical Technology Laboratory
- Cotton University
- Guwahati-781001
- India
| | - Pranay Sharma
- Department of Chemistry
- Cotton University
- Guwahati 781001
- India
| | - Amal Das
- Department of Chemistry
- Cotton University
- Guwahati 781001
- India
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17
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Nath H, Dutta D, Sharma P, Frontera A, Verma AK, Barceló-Oliver M, Devi M, Bhattacharyya MK. Adipato bridged novel hexanuclear Cu(ii) and polymeric Co(ii) coordination compounds involving cooperative supramolecular assemblies and encapsulated guest water clusters in a square grid host: antiproliferative evaluation and theoretical studies. Dalton Trans 2020; 49:9863-9881. [DOI: 10.1039/d0dt01007c] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Novel adipato bridged Cu(ii) and Co(ii) complexes synthesized by considering cytotoxicity, apoptosis, ROS generation, molecular docking and pharmacophore features.
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Affiliation(s)
- Hiren Nath
- Department of Chemistry
- Cotton University
- Guwahati-781001
- India
| | - Debajit Dutta
- Department of Chemistry
- Cotton University
- Guwahati-781001
- India
| | - Pranay Sharma
- Department of Chemistry
- Cotton University
- Guwahati-781001
- India
| | - Antonio Frontera
- Departament de Química
- Universitat de les Illes Balears
- 07122 Palma de Mallorca
- Spain
| | - Akalesh K. Verma
- Department of Zoology
- Cell & Biochemical Technology laboratory
- Cotton University
- Guwahati-781001
- India
| | | | - Mary Devi
- Department of Zoology
- Cell & Biochemical Technology laboratory
- Cotton University
- Guwahati-781001
- India
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18
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Massoud SS, Perez ZE, Courson JR, Fischer RC, Mautner FA, Vančo J, Čajan M, Trávníček Z. Slow magnetic relaxation in penta-coordinate cobalt(ii) field-induced single-ion magnets (SIMs) with easy-axis magnetic anisotropy. Dalton Trans 2020; 49:11715-11726. [DOI: 10.1039/d0dt02338h] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Two penta-coordinate [Co(Ln)(NCS)]ClO4 with substituted pyridyl based bispyrazolyl ligands have been structurally characterized. The complexes show an easy-axis magnetic anisotropy, large rhombicity and slow relaxation of magnetization.
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Affiliation(s)
- Salah S. Massoud
- Department of Chemistry
- University of Louisiana at Lafayette
- Lafayette
- USA
- Department of Chemistry
| | - Zoe E. Perez
- Department of Chemistry
- University of Louisiana at Lafayette
- Lafayette
- USA
| | | | - Roland C. Fischer
- Institut für Anorganische Chemie
- Technische Universität Graz
- A-8010 Graz
- Austria
| | - Franz A. Mautner
- Institut für Physikalische and Theoretische Chemie
- Technische Universität Graz
- A-8010 Graz
- Austria
| | - Ján Vančo
- Regional Centre of Advanced Technologies and Materials
- Division of Biologically Active Complexes and Molecular Magnets
- Palacký University in Olomouc
- CZ-783 71 Olomouc
- Czech Republic
| | - Michal Čajan
- Regional Centre of Advanced Technologies and Materials
- Division of Biologically Active Complexes and Molecular Magnets
- Palacký University in Olomouc
- CZ-783 71 Olomouc
- Czech Republic
| | - Zdeněk Trávníček
- Regional Centre of Advanced Technologies and Materials
- Division of Biologically Active Complexes and Molecular Magnets
- Palacký University in Olomouc
- CZ-783 71 Olomouc
- Czech Republic
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19
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Thermodynamics of complex formation in dimethylsulfoxide: The case of Co(II) complexes with nitrogen donor ligands and their O2 adducts. Inorganica Chim Acta 2019. [DOI: 10.1016/j.ica.2019.04.010] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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20
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Bhattacharyya MK, Saha U, Dutta D, Das A, Verma AK, Frontera A. Solvent-driven structural topology involving energetically significant intra- and intermolecular chelate ring contacts and anticancer activities of Cu(ii) phenanthroline complexes involving benzoates: experimental and theoretical studies. RSC Adv 2019; 9:16339-16356. [PMID: 35516385 PMCID: PMC9064362 DOI: 10.1039/c9ra01181a] [Citation(s) in RCA: 40] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2019] [Accepted: 05/15/2019] [Indexed: 01/02/2023] Open
Abstract
Two new coordination solids [Cu2(μ2-Bz)4(CH3OH)2][Cu2(η2-Bz)2(phen)2(H2O)2]·(NO3)2 (1) and [Cu(phen)(H2O)(Bz)(η2-Bz)] (2) (phen = 1,10-phenanthroline; Bz = benzoate) have been synthesized and characterized using elemental analysis, TGA, spectroscopic (IR, UV-vis-NIR and ESR) and single crystal X-ray diffraction techniques. Change of the solvent from methanol to DMF results in changes in the architectures that are triggered by a change from square pyramidal to octahedral coordination at the divalent metal centers for complexes 1 and 2 respectively. The structural topology of the complexes is established by the interplay of strong O-H⋯O and weak C-H⋯O, C-H⋯C, π-π stacking interactions. Unconventional parallel intramolecular and anti-parallel intermolecular contacts involving the chelate rings (CR) also stabilize the structures. The energetic analyses of the structures evidence that the parallel arrangement is energetically favoured which is likely due to the presence of the Cu⋯Cu cuprophilic interaction in 1 that is not established in 2. Compound 1 exhibits the highest antibacterial activity against Rhizobium leguminosarum among the tested cultures. In vitro cytotoxicity and apoptosis studies were carried out for compounds 1 and 2 on malignant Dalton's lymphoma cell line (DL). Both compounds showed a significant effect on the decrease in cell viability as compared to a control, while compound 2 induced remarkable cytotoxicity towards DL cells. Treatment also showed the appearance of membrane blebbing, chromatin condensation and fragmented nuclei which are typical characteristic features of apoptotic cell death. Furthermore, a docking study revealed that both compounds docked in the active sites of all the cancer target proteins under study. Moreover, SAR analysis revealed that oxygen and nitrogen atoms of compound 1 and the oxygen atoms of compound 2 are crucial for biological activities.
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Affiliation(s)
| | - Utpal Saha
- Department of Chemistry, Cotton University Guwahati 781001 Assam India
| | - Debajit Dutta
- Department of Chemistry, Cotton University Guwahati 781001 Assam India
| | - Amal Das
- Department of Chemistry, Cotton University Guwahati 781001 Assam India
| | - Akalesh K Verma
- Department of Zoology, Cell & Biochemical Technology Laboratory, Cotton University Guwahati 781001 Assam India
| | - Antonio Frontera
- Departament de Química, Universitat de les Illes Balears Crta de Valldemossa km 7.7 07122 Palma de Mallorca Baleares Spain
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21
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Saha U, Dutta D, Nath H, Franconetti A, Frontera A, Bhattacharyya MK. Supramolecular association in Cu(II) coordination complexes involving energetically significant NO⋯NO π–hole interaction and cooperative π-stacked ternary assembly: Experimental and theoretical studies. Inorganica Chim Acta 2019. [DOI: 10.1016/j.ica.2019.01.015] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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22
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Supramolecular association involving nitrile–nitrile interactions in polymeric Mn(II) coordination complexes: A combined experimental and theoretical study. Inorganica Chim Acta 2019. [DOI: 10.1016/j.ica.2018.12.055] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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23
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A novel oxalato bridged supramolecular ternary complex of Cu(II) involving energetically significant π-hole interaction: Experimental and theoretical studies. Inorganica Chim Acta 2019. [DOI: 10.1016/j.ica.2018.12.037] [Citation(s) in RCA: 34] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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24
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Horn Jr. A, Englert D, Roberts AE, Comba P, Schenk G, Krenske EH, Gahan LR. Synthesis, Magnetic Properties, and Catalytic Properties of a Nickel(II)-Dependent Biomimetic of Metallohydrolases. Front Chem 2018; 6:441. [PMID: 30320072 PMCID: PMC6168013 DOI: 10.3389/fchem.2018.00441] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2018] [Accepted: 09/05/2018] [Indexed: 11/13/2022] Open
Abstract
A dinickel(II) complex of the ligand 1,3-bis(bis(pyridin-2-ylmethyl)amino)propan-2-ol (HL1) has been prepared and characterized to generate a functional model for nickel(II) phosphoesterase enzymes. The complex, [Ni2(L1)(μ-OAc)(H2O)2](ClO4)2·H2O, was characterized by microanalysis, X-ray crystallography, UV-visible, and IR absorption spectroscopy and solid state magnetic susceptibility measurements. Susceptibility studies show that the complex is antiferromagnetically coupled with the best fit parameters J = -27.4 cm-1, g = 2.29, D = 28.4 cm-1, comparable to corresponding values measured for the analogous dicobalt(II) complex [Co2(L1)(μ-OAc)](ClO4)2·0.5 H2O (J = -14.9 cm-1 and g = 2.16). Catalytic measurements with the diNi(II) complex using the substrate bis(2,4-dinitrophenyl)phosphate (BDNPP) demonstrated activity toward hydrolysis of the phosphoester substrate with K m ~10 mM, and k cat ~0.025 s-1. The combination of structural and catalytic studies suggests that the likely mechanism involves a nucleophilic attack on the substrate by a terminal nucleophilic hydroxido moiety.
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Affiliation(s)
- Adolfo Horn Jr.
- Laboratório de Ciências Químicas, Universidade Estadual do Norte Fluminense Darcy Ribeiro, Campos dos Goytacazes, Brazil
| | - Daniel Englert
- Anorganisch-Chemisches Institut and Interdisciplinary Center of Scientific Computing, Universität Heidelberg, Heidelberg, Germany
- School of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane, QLD, Australia
| | - Asha E. Roberts
- Anorganisch-Chemisches Institut and Interdisciplinary Center of Scientific Computing, Universität Heidelberg, Heidelberg, Germany
| | - Peter Comba
- Anorganisch-Chemisches Institut and Interdisciplinary Center of Scientific Computing, Universität Heidelberg, Heidelberg, Germany
| | - Gerhard Schenk
- School of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane, QLD, Australia
| | - Elizabeth H. Krenske
- School of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane, QLD, Australia
| | - Lawrence R. Gahan
- School of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane, QLD, Australia
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25
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Dutta D, Chetry S, Gogoi A, Choudhury B, Guha AK, Bhattacharyya MK. Supramolecular association involving anion–π interactions in Cu(II) coordination solids: Experimental and theoretical studies. Polyhedron 2018. [DOI: 10.1016/j.poly.2018.05.039] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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26
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Kettenmann SD, Louka FR, Marine E, Fischer RC, Mautner FA, Kulak N, Massoud SS. Efficient Artificial Nucleases for Mediating DNA Cleavage Based on Tuning the Steric Effect in the Pyridyl Derivatives of Tripod Tetraamine-Cobalt(II) Complexes. Eur J Inorg Chem 2018. [DOI: 10.1002/ejic.201800276] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Affiliation(s)
| | - Febee R. Louka
- Department of Chemistry; University of Louisiana at Lafayette; P.O. Box 44370 70504 Lafayette LA USA
| | - Elise Marine
- Department of Chemistry; University of Louisiana at Lafayette; P.O. Box 44370 70504 Lafayette LA USA
| | - Roland C. Fischer
- Institut für Anorganische Chemische; Technische Universität Graz; Stremayrgasse 9/V 8010 Graz Austria
| | - Franz A. Mautner
- Institut für Physikalische and Theoretische Chemie; Technische Universität Graz; Stremayrgasse 9/II 8010 Graz Austria
| | - Nora Kulak
- Institut für Chemie und Biochemie; Freie Universität Berlin; Fabeckstr. 34/36 14195 Berlin Germany
| | - Salah S. Massoud
- Department of Chemistry; University of Louisiana at Lafayette; P.O. Box 44370 70504 Lafayette LA USA
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27
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Wang JW, Huang HH, Sun JK, Ouyang T, Zhong DC, Lu TB. Electrocatalytic and Photocatalytic Reduction of CO 2 to CO by Cobalt(II) Tripodal Complexes: Low Overpotentials, High Efficiency and Selectivity. CHEMSUSCHEM 2018; 11:1025-1031. [PMID: 29385321 DOI: 10.1002/cssc.201702280] [Citation(s) in RCA: 56] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/03/2017] [Revised: 01/30/2018] [Indexed: 06/07/2023]
Abstract
The reduction of carbon dioxide (CO2 ) has been considered as an approach to mitigate global warming and to provide renewable carbon-based fuels. Rational design of efficient, selective, and inexpensive catalysts with low overpotentials is urgently desired. In this study, four cobalt(II) tripodal complexes are tested as catalysts for CO2 reduction to CO in a MeCN/H2 O (4:1 v/v) solution. The replacement of pyridyl groups in the ligands with less basic quinolinyl groups greatly reduces the required overpotential for CO2 -to-CO conversion down to 200-380 mV. Benefitting from the low overpotentials, a photocatalyst system for CO2 -to-CO conversion is successfully constructed, with an maximum turnover number (TON) of 10 650±750, a turnover frequency (TOF) of 1150±80 h-1 , and almost 100 % selectivity to CO. These outstanding catalytic performances are further elucidated by DFT calculations.
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Affiliation(s)
- Jia-Wei Wang
- MOE Key Laboratory of Bioinorganic and Synthetic Chemistry, School of Chemistry, Sun Yat-Sen University, Guangzhou, 510275, China
- Institute of New Energy Materials and Low Carbon Technology, School of Material Science and Engineering, Tianjin University of Technology, Tianjin, 300384, China
| | - Hai-Hua Huang
- MOE Key Laboratory of Bioinorganic and Synthetic Chemistry, School of Chemistry, Sun Yat-Sen University, Guangzhou, 510275, China
| | - Jia-Kai Sun
- MOE Key Laboratory of Bioinorganic and Synthetic Chemistry, School of Chemistry, Sun Yat-Sen University, Guangzhou, 510275, China
| | - Ting Ouyang
- MOE Key Laboratory of Bioinorganic and Synthetic Chemistry, School of Chemistry, Sun Yat-Sen University, Guangzhou, 510275, China
| | - Di-Chang Zhong
- Institute of New Energy Materials and Low Carbon Technology, School of Material Science and Engineering, Tianjin University of Technology, Tianjin, 300384, China
| | - Tong-Bu Lu
- MOE Key Laboratory of Bioinorganic and Synthetic Chemistry, School of Chemistry, Sun Yat-Sen University, Guangzhou, 510275, China
- Institute of New Energy Materials and Low Carbon Technology, School of Material Science and Engineering, Tianjin University of Technology, Tianjin, 300384, China
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28
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Zhou LX, Xu W, Han XY, Si ZX, Zheng YQ. Syntheses, crystal structures and magnetic properties of four tetrahydrofuran-2,3,4,5-tetracarboxylato bridged transition metal complexes with N-donor heteroaromatic co-ligands. TRANSIT METAL CHEM 2017. [DOI: 10.1007/s11243-017-0184-2] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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29
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Green BP, Renfrew AK, Glenister A, Turner P, Hambley TW. The influence of the ancillary ligand on the potential of cobalt(iii) complexes to act as chaperones for hydroxamic acid-based drugs. Dalton Trans 2017; 46:15897-15907. [DOI: 10.1039/c7dt03645k] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
Cobalt(iii) chaperone complexes can modulate the cytotoxicity and subcellular distribution of biologically active hydroxamic acids.
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Affiliation(s)
| | | | | | - Peter Turner
- School of Chemistry
- The University of Sydney
- Sydney
- Australia
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30
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Alam R, Pal K, Shaw BK, Dolai M, Pal N, Saha SK, Ali M. Synthesis, structure, catalytic and magnetic properties of a pyrazole based five coordinated di-nuclear cobalt(II) complex. Polyhedron 2016. [DOI: 10.1016/j.poly.2015.12.062] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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31
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Deka H, Ghosh S, Saha S, Gogoi K, Mondal B. Effect of ligand denticity on the nitric oxide reactivity of cobalt(ii) complexes. Dalton Trans 2016; 45:10979-88. [DOI: 10.1039/c6dt01169a] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
NO reactivity of three Co(ii) complexes, 1, 2 and 3 have been studied in degassed methanol solution. The complexes differ from each other in terms of denticity and flexibility of the ligand fameworks. Complex 1 undergoes reductive nitrosylation of the metal ion; 2 results in corresponding [CoIII(NO−)] complex; whereas 3 does not react with NO.
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Affiliation(s)
- Hemanta Deka
- Department of Chemistry
- Indian Institute of Technology Guwahati
- Assam-781039
- India
| | - Somnath Ghosh
- Department of Chemistry
- Indian Institute of Technology Guwahati
- Assam-781039
- India
| | - Soumen Saha
- Department of Chemistry
- Indian Institute of Technology Guwahati
- Assam-781039
- India
| | - Kuldeep Gogoi
- Department of Chemistry
- Indian Institute of Technology Guwahati
- Assam-781039
- India
| | - Biplab Mondal
- Department of Chemistry
- Indian Institute of Technology Guwahati
- Assam-781039
- India
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32
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Wang J, Li C, Zhou Q, Wang W, Hou Y, Zhang B, Wang X. A polypyridyl Co(ii) complex-based water reduction catalyst with double H2 evolution sites. Catal Sci Technol 2016. [DOI: 10.1039/c6cy01897a] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
The unique coordination mode of Cl-TMPA and the double H2 evolution sites of [Co(Cl-TMPA)Cl2] provide a new strategy to design more effective WRCs.
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Affiliation(s)
- Junfei Wang
- Key Laboratory of Photochemical Conversion and Optoelectronic Materials
- Technical Institute of Physics and Chemistry
- Chinese Academy of Sciences
- Beijing 100190
- PR China
| | - Chao Li
- Key Laboratory of Photochemical Conversion and Optoelectronic Materials
- Technical Institute of Physics and Chemistry
- Chinese Academy of Sciences
- Beijing 100190
- PR China
| | - Qianxiong Zhou
- Key Laboratory of Photochemical Conversion and Optoelectronic Materials
- Technical Institute of Physics and Chemistry
- Chinese Academy of Sciences
- Beijing 100190
- PR China
| | - Weibo Wang
- Key Laboratory of Photochemical Conversion and Optoelectronic Materials
- Technical Institute of Physics and Chemistry
- Chinese Academy of Sciences
- Beijing 100190
- PR China
| | - Yuanjun Hou
- Key Laboratory of Photochemical Conversion and Optoelectronic Materials
- Technical Institute of Physics and Chemistry
- Chinese Academy of Sciences
- Beijing 100190
- PR China
| | - Baowen Zhang
- Key Laboratory of Photochemical Conversion and Optoelectronic Materials
- Technical Institute of Physics and Chemistry
- Chinese Academy of Sciences
- Beijing 100190
- PR China
| | - Xuesong Wang
- Key Laboratory of Photochemical Conversion and Optoelectronic Materials
- Technical Institute of Physics and Chemistry
- Chinese Academy of Sciences
- Beijing 100190
- PR China
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33
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Solanki A, Patil YP, Kumar SB. Mononuclear five-coordinate cobalt(II) complexes with N4-coordinate pyrazole based ligand and pseudohalogens: synthesis, structures, DNA and protein binding study. J COORD CHEM 2015. [DOI: 10.1080/00958972.2015.1085515] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Ankita Solanki
- Faculty of Science, Department of Chemistry, The Maharaja Sayajirao University of Baroda, Vadodara, India
| | - Yogesh Prakash Patil
- Inorganic and Physical Chemistry Department, Indian Institute of Science, Banglore, India
| | - Sujit Baran Kumar
- Faculty of Science, Department of Chemistry, The Maharaja Sayajirao University of Baroda, Vadodara, India
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34
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Kumar S, Mandon D. Versatile Coordination Mode of a New Pyridine-Based Ditopic Ligand with Transition Metals: From Regular Pyridine to Alkyne and Alkenyl Bindings and Indolizinium Formation. Inorg Chem 2015. [PMID: 26200923 DOI: 10.1021/acs.inorgchem.5b01096] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The new BPMPB ligand, namely, bis[1-bis(2-pyridylmethyl),1 (pyridyl)]butyne, can be very easily obtained as a side product in the known reaction of picolyl chloride and sodium acetylide (which major product is the known terminal alkyne-substituted tripod). This symmetrical ligand contains two identical coordination sites with two methylenepyridines and one pyridyl group on each side, linked by an alkyne function providing a semirigid segment. Together with the molecular structure of the ligand which is reported, we describe the preparation of complexes with Fe(II)Cl2, Co(II)Cl2, Ni(II)Cl2, Cu(I)Cl, and Zn(II)Cl2 salts. All complexes have been characterized by X-ray diffraction studies as well as by standard spectroscopic techniques. The striking point in this work is the diversity of the structures that are obtained. Co(II) and Zn(II) provide isostructural dinuclear complexes in which both coordination sites are occupied within a tetrahedral symmetry. The Cu(I) complex is also a dinuclear compound, but in that case, the copper atom is coordinated to the alkyne moiety, two pyridines, and a bridging chloride. The (13)C NMR spectrum of the copper complex confirms that the metal center is coordinated to the alkyne in solution. The coordination of Ni(II) results in the formation of a mononuclear complex in which a pyridine has fused with the alkyne moiety to generate an indolizinium group; the structure of the corresponding alkenyl complex is reported. Finally, the addition of FeCl2 to the ligand results in the formation of a mononuclear complex with a free, noncoordinated indolizinium. The sequence developed in the present work illustrates the possibility for the metal centers to adopt various coordination modes which may be relevant to the conversion of an alkyne and a pyridyl unit into indolizinium.
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Affiliation(s)
- Sushil Kumar
- Laboratoire de Chimie, Electrochimie Moléculaires et Chimie Analytique, UMR 6521, CNRS-Université de Bretagne Occidentale, 6 Avenue Victor Le Gorgeu CS 93837, F-29238 Brest cedex 3, France
| | - Dominique Mandon
- Laboratoire de Chimie, Electrochimie Moléculaires et Chimie Analytique, UMR 6521, CNRS-Université de Bretagne Occidentale, 6 Avenue Victor Le Gorgeu CS 93837, F-29238 Brest cedex 3, France
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35
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Seven coordinated cobalt(II) complexes with 2,6-diacetylpyridine bis(4-acylhydrazone) ligands: Synthesis, characterization, DNA-binding and nuclease activity. Inorganica Chim Acta 2015. [DOI: 10.1016/j.ica.2015.03.040] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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36
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Weisser F, Stevens H, Klein J, van der Meer M, Hohloch S, Sarkar B. Tailoring RuIIPyridine/Triazole Oxygenation Catalysts and Using Photoreactivity to Probe their Electronic Properties. Chemistry 2015; 21:8926-38. [DOI: 10.1002/chem.201406441] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2014] [Indexed: 12/17/2022]
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37
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Massoud SS, Louka FR, David RN, Dartez MJ, Nguyn QL, Labry NJ, Fischer RC, Mautner FA. Five-coordinate metal(II) complexes based pyrazolyl ligands. Polyhedron 2015. [DOI: 10.1016/j.poly.2015.02.014] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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38
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Huang QY, Li T, Meng XR. A new 3D cobalt(II) complex with left- and right-handed helical channels. INORG CHEM COMMUN 2014. [DOI: 10.1016/j.inoche.2014.09.018] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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39
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Inomata M, Suenaga Y. Crystal structure of a dinuclear Co(II) complex with bridging fluoride ligands: di-μ-fluorido-bis-{tris-[(6-methyl-pyridin-2-yl)meth-yl]amine}-dicobalt(II) bis-(tetra-fluorido-borate). Acta Crystallogr Sect E Struct Rep Online 2014; 70:m359-60. [PMID: 25484774 PMCID: PMC4257317 DOI: 10.1107/s1600536814021631] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2014] [Accepted: 10/01/2014] [Indexed: 11/13/2022]
Abstract
Reaction of Co(BF4)2·6H2O with tris[(6-methylpyridin-2-yl)methyl]amiine in methanol results in a fluoride abstraction from BF4−, yielding the unexpected title compound, [Co2F2(C21H24N4)2](BF4)2. The complex cation consists of two inversion-related [Co(C21H24N4)]2+ moieties bridged by a pair of fluoride ligands. The CoII cation is six-coordinated in a distorted octahedral geometry and forms a +II high-spin state. In the crystal, the complex cation and the BF4− anion are connected by C—H⋯F hydrogen bonds, forming a three-dimensional network. An intramolecular C—H⋯F hydrogen bond is also observed.
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Affiliation(s)
- Masataka Inomata
- Department of Science, Kinki University, 3-4-1 Kowakae, Higashi-Osaka 577-8502, Japan
| | - Yusaku Suenaga
- Department of Science, Kinki University, 3-4-1 Kowakae, Higashi-Osaka 577-8502, Japan
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40
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Massoud SS, Dubin M, Guilbeau AE, Spell M, Vicente R, Wilfling P, Fischer RC, Mautner FA. Azido- and thiocyanato-cobalt(II) complexes based pyrazole ligands. Polyhedron 2014. [DOI: 10.1016/j.poly.2014.04.025] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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41
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Massoud SS, Perkins RS, Louka FR, Xu W, Le Roux A, Dutercq Q, Fischer RC, Mautner FA, Handa M, Hiraoka Y, Kreft GL, Bortolotto T, Terenzi H. Efficient hydrolytic cleavage of plasmid DNA by chloro-cobalt(II) complexes based on sterically hindered pyridyl tripod tetraamine ligands: synthesis, crystal structure and DNA cleavage. Dalton Trans 2014; 43:10086-103. [PMID: 24872210 DOI: 10.1039/c4dt00615a] [Citation(s) in RCA: 64] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Four new cobalt(ii) complexes [Co(6-MeTPA)Cl]ClO4/PF6 (2/2a), [Co(6-Me2TPA)Cl]ClO4/PF6 (3/3a), [Co(BPQA)Cl]ClO4/PF6 (4/4a) and [Co(BQPA)Cl]ClO4/PF6 (5/5a) as well as [Co(TPA)Cl]ClO4 (1) where TPA = tris(2-pyridylmethyl)amine, 6-MeTPA = ((6-methyl-2-pyridyl)methyl)bis(2-pyridylmethyl)amine, 6-Me2TPA = bis(6-methyl-2-pyridyl)methyl)-(2-pyridylmethyl)amine, BPQA = bis(2-pyridylmethyl)-(2-quinolylmethyl)-amine and BQPA = bis(2-quinolylmethyl)-(2-pyridylmethyl)amine were synthesized and structurally characterized. Single crystal X-ray crystallography confirmed the distorted trigonal bipyramidal geometries of complexes 2a-5a. Spectrophotometric titrations and conductivity measurements of the complexes in the CH3CN-H2O mixture showed that the chloro complexes exist in equilibrium with the corresponding hydrolyzed aqua species, [Co(L)(H2O)](2+). The pKa values of the coordinated H2O in aqua complexes vary from 8.4 to 8.7 (37 °C). The interactions of the complexes (1-5) with DNA have been investigated at pH = 7.0 and 9.0 (10 mM Tris-HCl buffer) and 37 °C where very high catalytic cleavage was observed. Under pseudo Michaelis-Menten kinetic conditions, the catalytic rate constants, kcat, decrease in the order 4>2>5>1>3. At pH 7.0 (10 mM Tris-HCl buffer) and 37 °C, the kcat value for complex 4 (6.02 h(-1)), where [Co(BPQA)(H2O)](2+) is the major species, corresponds to 170 million rate enhancement over the non-catalyzed DNA. Electrophoretic experiments conducted in the presence and absence of radical scavengers (DMSO, KI, NaN3) ruled out the oxidative mechanistic pathway of the reaction and suggested that the hydrolytic mechanism is the preferred one. This finding was in agreement with the observed increase in the kcat values at pH 9.0 compared to the corresponding values at pH 7.0 as a result of the increased concentration of the reactive hydroxo species, [Co(L)(OH)](+). The reactivity of the synthesized complexes in catalyzing the DNA cleavage is discussed in relation to the steric effect imposed by the coordinated pyridyl ligand around the central cobalt(ii) center.
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Affiliation(s)
- Salah S Massoud
- Department of Chemistry, University of Louisiana at Lafayette, P.O. Box 44370 Lafayette, LA 70504, USA.
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Jeragh B, El-Asmy AA. Structure and spectroscopic studies of homo-and heterometallic complexes of adipic acid dihydrazide. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2014; 125:25-35. [PMID: 24530707 DOI: 10.1016/j.saa.2014.01.071] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/13/2013] [Revised: 12/23/2013] [Accepted: 01/08/2014] [Indexed: 06/03/2023]
Abstract
A single crystal of adipic acid dihydrazide, ADH, has been analyzed. Its reaction with Co(2+), Ni(2+), Cu(2+), Zn(2+), Cd(2+), Hg(2+), Ag(+), Pd(2+) and/or Pt(2+) gave homometallic and heterometallic complexes which are characterized by partial elemental analysis, spectra (MS, ESR, (1)H NMR, electronic; IR), thermal analysis and magnetic measurements. Some complexes: Zn(0.73)Cu(ADH)Cl4·H2O; Zn(0.71)Hg(0.36)(ADH)Cl4·H2O; Zn(0.65)Cd(0.46)(ADH)Cl4·½H2O; Zn(0.75)Co(0.41)(ADH-2H)Cl2·3H2O; Cd0.85Co0.43(ADH)Cl4·½EtOH were isolated having nonstiochiometric metal ratios. The ligand behaves as a neutral (bidentate or tetradentate) and/or binegative tetradentate. A square-pyramid, square-planar and tetrahedral structures were proposed for the homo Co(II), Cu(II) and Ni(II) complexes, respectively. A similar and different stereochemistry around each metal ion (tetrahedral+tetrahedral; tetrahedral+square-planar; tetrahedral+tetrahedral and/or tetrahedral+octahedral) was suggested for the heterometallic complexes. Some complexes were found highly stable with stability point >240 °C; the most stable is [HgNi(ADH-2H)Cl2]. The presence of diamagnetic atom (Zn, Cd or Hg) reduces the magnetic moments and gave anomalous moments. The degradation steps and the hydrated complexes are confirmed through the TGA study. The order of covalency of [Zn(0.73)Cu(ADH)Cl4]·H2O, [CdCu(ADH)Cl4]·H2O and [HgCu(ADH-2H)Cl2] matches with the size of the second metal (Zn complex>Cd complex>Hg complex). Some heterometallic complexes were found nonstoichiometric through the analysis of their metal content and supported by TGA.
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Affiliation(s)
- Bakir Jeragh
- Chemistry Department, Faculty of Science, Kuwait University, P.O. Box 5969, Safat 1360, Kuwait.
| | - Ahmed A El-Asmy
- Chemistry Department, Faculty of Science, Kuwait University, P.O. Box 5969, Safat 1360, Kuwait
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Tereniak SJ, Carlson RK, Clouston LJ, Young VG, Bill E, Maurice R, Chen YS, Kim HJ, Gagliardi L, Lu CC. Role of the Metal in the Bonding and Properties of Bimetallic Complexes Involving Manganese, Iron, and Cobalt. J Am Chem Soc 2013; 136:1842-55. [DOI: 10.1021/ja409016w] [Citation(s) in RCA: 78] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Affiliation(s)
- Stephen J. Tereniak
- Department
of Chemistry, University of Minnesota, 207 Pleasant Street SE, Minneapolis, Minnesota 55455-0431, United States
| | - Rebecca K. Carlson
- Department
of Chemistry, University of Minnesota, 207 Pleasant Street SE, Minneapolis, Minnesota 55455-0431, United States
- Supercomputing
Institute and Chemical Theory Center, University of Minnesota, Minneapolis, Minnesota 55455, United States
| | - Laura J. Clouston
- Department
of Chemistry, University of Minnesota, 207 Pleasant Street SE, Minneapolis, Minnesota 55455-0431, United States
| | - Victor G. Young
- Department
of Chemistry, University of Minnesota, 207 Pleasant Street SE, Minneapolis, Minnesota 55455-0431, United States
| | - Eckhard Bill
- Max Planck Institut für Chemische Energiekonversion, Stiftstraße 34-36, 45470 Mülheim an der Ruhr, Germany
| | - Rémi Maurice
- Department
of Chemistry, University of Minnesota, 207 Pleasant Street SE, Minneapolis, Minnesota 55455-0431, United States
- Supercomputing
Institute and Chemical Theory Center, University of Minnesota, Minneapolis, Minnesota 55455, United States
| | - Yu-Sheng Chen
- ChemMatCARS, University of Chicago, Argonne, Illinois 60439, United States
| | - Hyun Jung Kim
- Department
of Chemistry, University of Minnesota, 207 Pleasant Street SE, Minneapolis, Minnesota 55455-0431, United States
- Supercomputing
Institute and Chemical Theory Center, University of Minnesota, Minneapolis, Minnesota 55455, United States
| | - Laura Gagliardi
- Department
of Chemistry, University of Minnesota, 207 Pleasant Street SE, Minneapolis, Minnesota 55455-0431, United States
- Supercomputing
Institute and Chemical Theory Center, University of Minnesota, Minneapolis, Minnesota 55455, United States
| | - Connie C. Lu
- Department
of Chemistry, University of Minnesota, 207 Pleasant Street SE, Minneapolis, Minnesota 55455-0431, United States
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Massoud SS, Louka FR, Obaid YK, Vicente R, Ribas J, Fischer RC, Mautner FA. Metal ions directing the geometry and nuclearity of azido-metal(ii) complexes derived from bis(2-(3,5-dimethyl-1H-pyrazol-1-yl)ethyl)amine. Dalton Trans 2013; 42:3968-78. [DOI: 10.1039/c2dt32540c] [Citation(s) in RCA: 69] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Chakraborty B, Halder P, Banerjee PR, Paine TK. Oxidative C–C Bond Cleavage of α‐Keto Acids by Cobalt(II) Complexes of Nitrogen Donor Ligands. Eur J Inorg Chem 2012. [DOI: 10.1002/ejic.201200663] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Biswarup Chakraborty
- Department of Inorganic Chemistry, Indian Association for the Cultivation of Science, 2A & 2B Raja S. C. Mullick Road, Jadavpur, Kolkata 700032, India, Fax: +91‐33‐2473‐2805
| | - Partha Halder
- Department of Inorganic Chemistry, Indian Association for the Cultivation of Science, 2A & 2B Raja S. C. Mullick Road, Jadavpur, Kolkata 700032, India, Fax: +91‐33‐2473‐2805
| | - Priya Ranjan Banerjee
- Department of Inorganic Chemistry, Indian Association for the Cultivation of Science, 2A & 2B Raja S. C. Mullick Road, Jadavpur, Kolkata 700032, India, Fax: +91‐33‐2473‐2805
| | - Tapan Kanti Paine
- Department of Inorganic Chemistry, Indian Association for the Cultivation of Science, 2A & 2B Raja S. C. Mullick Road, Jadavpur, Kolkata 700032, India, Fax: +91‐33‐2473‐2805
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Schweinfurth D, Demeshko S, Khusniyarov MM, Dechert S, Gurram V, Buchmeiser MR, Meyer F, Sarkar B. Capped-Tetrahedrally Coordinated Fe(II) and Co(II) Complexes Using a “Click”-Derived Tripodal Ligand: Geometric and Electronic Structures. Inorg Chem 2012; 51:7592-7. [DOI: 10.1021/ic300392e] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- David Schweinfurth
- Institut für
Anorganische
Chemie, Universität Stuttgart, Pfaffenwaldring
55, D-70550, Stuttgart, Germany
| | - Serhiy Demeshko
- Institut für Anorganische
Chemie, Georg-August Universität Göttingen, Tammanstrasse 4, D-37077, Göttingen, Germany
| | - Marat M. Khusniyarov
- Department Chemie und Pharmazie, Friedrich-Alexander Universität Erlangen-Nürnberg, Egerlandstrasse 1, D-91058, Erlangen, Germany
| | - Sebastian Dechert
- Institut für Anorganische
Chemie, Georg-August Universität Göttingen, Tammanstrasse 4, D-37077, Göttingen, Germany
| | | | - Michael R. Buchmeiser
- Institut für Polymerchemie, Universität Stuttgart, Pfaffenwaldring 55, D-70550,
Stuttgart, Germany
| | - Franc Meyer
- Institut für Anorganische
Chemie, Georg-August Universität Göttingen, Tammanstrasse 4, D-37077, Göttingen, Germany
| | - Biprajit Sarkar
- Institut für
Anorganische
Chemie, Universität Stuttgart, Pfaffenwaldring
55, D-70550, Stuttgart, Germany
- Institut für Chemie und
Biochemie, Anorganische Chemie, Freie Universität Berlin, Fabeckstrasse 34-36, D-14195, Berlin, Germany
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Ward AL, Elbaz L, Kerr JB, Arnold J. Nonprecious metal catalysts for fuel cell applications: electrochemical dioxygen activation by a series of first row transition metal tris(2-pyridylmethyl)amine complexes. Inorg Chem 2012; 51:4694-706. [PMID: 22458367 DOI: 10.1021/ic2026957] [Citation(s) in RCA: 65] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
A series of divalent first row triflate complexes supported by the ligand tris(2-pyridylmethyl)amine (TPA) have been investigated as oxygen reduction catalysts for fuel cell applications. [(TPA)M(2+)](n+) (M = Mn, Fe, Co, Ni, and Cu) derivatives were synthesized and characterized by X-ray crystallography, cyclic voltammetry, NMR spectroscopy, magnetic susceptibility, IR spectroscopy, and conductance measurements. The stoichiometric and electrochemical O(2) reactivities of the series were examined. Rotating-ring disk electrode (RRDE) voltammetry was used to examine the catalytic activity of the complexes on a carbon support in acidic media, emulating fuel cell performance. The iron complex displayed a selectivity of 89% for four-electron conversion and demonstrated the fastest reaction kinetics, as determined by a kinetic current of 7.6 mA. Additionally, the Mn, Co, and Cu complexes all showed selective four-electron oxygen reduction (<28% H(2)O(2)) at onset potentials (~0.44 V vs RHE) comparable to state of the art molecular catalysts, while being straightforward to access synthetically and derived from nonprecious metals.
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Affiliation(s)
- Ashleigh L Ward
- Department of Chemistry, University of California, Berkeley, California 94720, USA
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Saad FA, Buurma NJ, Amoroso AJ, Knight JC, Kariuki BM. Co-ordination behaviour of a novel bisthiourea tripodal ligand: structural, spectroscopic and electrochemical properties of a series of transition metal complexes. Dalton Trans 2012; 41:4608-17. [PMID: 22373815 DOI: 10.1039/c2dt11732k] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
The synthesis of a thiourea substituted derivative of tris(pyridyl-2-methyl)amine (TPA) is reported. Two of the three pyridine rings are substituted in the 6-position with benzoylthiourea groups. These thiourea groups undergo intramolecular hydrogen bonding to form six-membered rings which leaves one N-H group available to form hydrogen bonds with other molecules. This reports details how the complexation of this new ligand with transition metal ions yields complexes with differing geometries. Seven co-ordinate Mn(II) and Cd(II), six co-ordinate Ni(II) and five co-ordinate Co(II), Cu(II) and Zn(II) complexes have been isolated.
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Affiliation(s)
- Fawaz A Saad
- Cardiff University of Wales-Department of Chemistry, Main Building, Park Place, Cardiff, CF10 3AT, United Kingdom
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Structural characterization of five-coordinate copper(II), nickel(II), and cobalt(II) thiocyanato complexes derived from bis(2-(3,5-dimethyl-1-pyrazolyl)ethyl)amine. Polyhedron 2012. [DOI: 10.1016/j.poly.2011.10.011] [Citation(s) in RCA: 71] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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50
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Effect of the central metal ion on the cleavage of DNA by [M(TPA)Cl]ClO4 complexes (M=CoII, CuII and ZnII, TPA=tris(2-pyridylmethyl)amine): An efficient artificial nuclease for DNA cleavage. Inorganica Chim Acta 2011. [DOI: 10.1016/j.ica.2011.04.012] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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