1
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Pahar S, Maayan G. An intramolecular cobalt-peptoid complex as an efficient electrocatalyst for water oxidation at low overpotential. Chem Sci 2024; 15:12928-12938. [PMID: 39148784 PMCID: PMC11323339 DOI: 10.1039/d4sc01182a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2024] [Accepted: 07/05/2024] [Indexed: 08/17/2024] Open
Abstract
Water electrolysis is the simplest way to produce hydrogen, as a clean renewable fuel. However, the high overpotential and slow kinetics hamper its applicability. Designing efficient and stable electrocatalysts for water oxidation (WO), which is the first and limiting step of the water splitting process, can overcome this limitation. However, the development of such catalysts based on non-precious metal ions is still challenging. Herein we describe a bio-inspired Co(iii)-based complex i.e., a stable and efficient molecular electrocatalyst for WO, constructed from a peptidomimetic oligomer called peptoid - N-substituted glycine oligomer - bearing two binding ligands, terpyridine and bipyridine, and one ethanolic group as a proton shuttler. Upon binding of a cobalt ion, this peptoid forms an intramolecular Co(iii) complex, that acts as an efficient electrocatalyst for homogeneous WO in aqueous phosphate buffer at pH 7 with a high faradaic efficiency of up to 92% at an overpotential of about 430 mV, which is the lowest reported for Co-based homogeneous WO electrocatalysts to date. We demonstrated the high stability of the complex during electrocatalytic WO and that the ethanolic side chain plays a key role in the stability and activity of the complex and also in facilitating water binding, thus mimicking an enzymatic second coordination sphere.
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Affiliation(s)
- Suraj Pahar
- Schulich Faculty of Chemistry, Technion-Israel Institute of Technology Technion City Haifa 3200008 Israel
| | - Galia Maayan
- Schulich Faculty of Chemistry, Technion-Israel Institute of Technology Technion City Haifa 3200008 Israel
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2
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Rojas-Luna R, Romero-Salguero FJ, Esquivel D, Roy S. Manipulating the Coordination Structure of Molecular Cobalt Sites in Periodic Mesoporous Organosilica for CO 2 Photoreduction. ACS APPLIED ENERGY MATERIALS 2024; 7:5924-5936. [PMID: 39055067 PMCID: PMC11267497 DOI: 10.1021/acsaem.4c01161] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/08/2024] [Revised: 06/18/2024] [Accepted: 06/20/2024] [Indexed: 07/27/2024]
Abstract
Photocatalytic CO2 reduction, including reaction rate, product selectivity, and longevity, is highly sensitive to the coordination structure of the catalytic active sites, and the precise design of the active site remains a challenge in heterogeneous catalysts. Herein, we report on the modulation of the coordination structure of MN x -type active sites (M = Co or Ni; x = 4 or 5) anchored on a periodic mesoporous organosilica (PMO) support to improve photocatalytic CO2 reduction. The PMO was functionalized with pendant 3,6-di(2'-pyridyl)pyridazine (dppz) groups to allow immobilization of molecular Co and Ni complexes with polypyridine ligands. A comparative analysis of CO2 photoreduction in the presence of an organic photosensitizer (4CzIPN, 1,2,3,5-tetrakis(carbazol-9-yl)-4,6-dicyanobenzene) and a conventional [Ru(bpy)3]Cl2 sensitizer revealed strong influence of the coordination environment on the catalytic performance. CoN5-PMO demonstrated a superior CO2 photoreduction activity than the other materials and displayed a cobalt-based turnover number (TONCO) of 92 for CO evolution at ∼75% selectivity after 3 h irradiation in the presence of 4CzIPN. The hybrid CoN5-PMO catalyst exhibited better activity than its homogeneous [CoN5] counterpart, indicating that the heterogenization promotes the formation of isolated active sites with improved longevity and faster catalytic rate.
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Affiliation(s)
- Raúl Rojas-Luna
- Departamento
de Química Orgánica, Instituto Químico para la
Energía y el Medioambiente (IQUEMA), Facultad de Ciencias, Universidad de Córdoba, Campus de Rabanales, Edificio Marie Curie, Córdoba E-14071, Spain
- School
of Chemistry, University of Lincoln, Green Lane, Lincoln LN6 7DL, U.K.
| | - Francisco J. Romero-Salguero
- Departamento
de Química Orgánica, Instituto Químico para la
Energía y el Medioambiente (IQUEMA), Facultad de Ciencias, Universidad de Córdoba, Campus de Rabanales, Edificio Marie Curie, Córdoba E-14071, Spain
| | - Dolores Esquivel
- Departamento
de Química Orgánica, Instituto Químico para la
Energía y el Medioambiente (IQUEMA), Facultad de Ciencias, Universidad de Córdoba, Campus de Rabanales, Edificio Marie Curie, Córdoba E-14071, Spain
| | - Souvik Roy
- School
of Chemistry, University of Lincoln, Green Lane, Lincoln LN6 7DL, U.K.
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3
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Fajardo DA, Arteaga D, Ellena J, Santiago PHO, D'Vries RF, Lenis LA. Synthesis, characterization and structural analysis of complexes from 2,2':6',2''-terpyridine derivatives with transition metals. Acta Crystallogr C Struct Chem 2024; 80:200-211. [PMID: 38752713 DOI: 10.1107/s2053229624004224] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2024] [Accepted: 05/07/2024] [Indexed: 06/06/2024] Open
Abstract
The synthesis and structural characterization of three families of coordination complexes synthesized from 4'-phenyl-2,2':6',2''-terpyridine (8, Ph-TPY), 4'-(4-chlorophenyl)-2,2':6',2''-terpyridine (9, ClPh-TPY) and 4'-(4-methoxyphenyl)-2,2':6',2''-terpyridine (10, MeOPh-TPY) ligands with the divalent metals Co2+, Fe2+, Mn2+ and Ni2+ are reported. The compounds were synthesized from a 1:2 mixture of the metal and ligand, resulting in a series of complexes with the general formula [M(R-TPY)2](ClO4)2 (where M = Co2+, Fe2+, Mn2+ and Ni2+, and R-TPY = Ph-TPY, ClPh-TPY and MeOPh-TPY). The general formula and structural and supramolecular features were determinated by single-crystal X-ray diffraction for bis(4'-phenyl-2,2':6',2''-terpyridine)nickel(II) bis(perchlorate), [Ni(C21H15N3)2](ClO4)2 or [Ni(Ph-TPY)2](ClO4)2, bis[4'-(4-methoxyphenyl)-2,2':6',2''-terpyridine]manganese(II) bis(perchlorate), [Mn(C22H17N3O)2](ClO4)2 or [Mn(MeOPh-TPY)2](ClO4)2, and bis(4'-phenyl-2,2':6',2''-terpyridine)manganese(II) bis(perchlorate), [Mn(C21H15N3)2](ClO4)2 or [Mn(Ph-TPY)2](ClO4)2. In all three cases, the complexes present distorted octahedral coordination polyhedra and the crystal packing is determined mainly by weak C-H...π interactions. All the compounds (except for the Ni derivatives, for which FT-IR, UV-Vis and thermal analysis are reported) were fully characterized by spectroscopic (FT-IR, UV-Vis and NMR spectroscopy) and thermal (TGA-DSC, thermogravimetric analysis-differential scanning calorimetry) methods.
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Affiliation(s)
- Daniel A Fajardo
- Grupo de Investigación Química de Productos Naturales (QPN), Facultad de Ciencias Naturales, Exactas y de la educación, Universidad del Cauca, Popayán 19003, Colombia
| | - Danny Arteaga
- Grupo de Investigación Química de Productos Naturales (QPN), Facultad de Ciencias Naturales, Exactas y de la educación, Universidad del Cauca, Popayán 19003, Colombia
| | - Javier Ellena
- São Carlos Institute of Physics, University of São Paulo, CEP 13.566-590, São Carlos, SP, Brazil
| | - Pedro H O Santiago
- São Carlos Institute of Physics, University of São Paulo, CEP 13.566-590, São Carlos, SP, Brazil
| | - Richard F D'Vries
- Grupo de Investigación Química de Productos Naturales (QPN), Facultad de Ciencias Naturales, Exactas y de la educación, Universidad del Cauca, Popayán 19003, Colombia
| | - Luis Alberto Lenis
- Grupo de Investigación Química de Productos Naturales (QPN), Facultad de Ciencias Naturales, Exactas y de la educación, Universidad del Cauca, Popayán 19003, Colombia
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4
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Thammanatpong K, Surawatanawong P. Mechanisms of hydrogen evolution by six-coordinate cobalt complexes: a density functional study on the role of a redox-active pyridinyl-substituted diaminotriazine benzamidine ligand as a proton relay. Dalton Trans 2024; 53:6006-6019. [PMID: 38469898 DOI: 10.1039/d3dt03960a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/13/2024]
Abstract
The hydrogen evolution reaction is an important process for energy storage. The six-coordinate cobalt complex [CoIII(L1-)(LH)]2+ (LH = N-(4-amino-6-(pyridin-2-yl)-1,3,5-triazin-2-yl)benzamidine) was found to catalyze photocatalytic hydrogen evolution. In this work, we performed density functional calculations to obtain the reduction potentials and the proton-transfer free energy of possible intermediates to determine the preferred pathways for proton reduction. The mechanism involves the metal-based reduction of Co(III) to Co(II) before the protonation at the amidinate N on the pyridinyl-substituted diaminotriazine benzamidinate ligand L1- to form [CoII(LH)(LH)]2+. Essentially, the subsequent electron transfer is not metal-based reduction, but rather ligand-based reduction to form [CoII(LH)(LH˙1-)]1+. Through a proton-coupled electron transfer process, the cobalt hydride [CoIIH(LH)(LH2˙)]1+ is formed as the key intermediate for hydrogen evolution. As the cobalt hydride complex is coordinatively saturated, a structural change is required when the hydride on Co is coupled with the proton on pyridine. Notably, the redox-active nature of the ligand results in the low acidity of the protonated pyridine moiety of LH2˙, which impedes its function as a proton relay. Our findings suggest that separating the proton relay fragment from the electron reservoir fragment of the redox-active ligand is preferred for fully utilizing both features in catalytic H2 evolution.
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Affiliation(s)
- Kittimeth Thammanatpong
- Department of Chemistry and Center of Excellence for Innovation in Chemistry, Faculty of Science, Mahidol University, Bangkok 10400, Thailand.
| | - Panida Surawatanawong
- Department of Chemistry and Center of Excellence for Innovation in Chemistry, Faculty of Science, Mahidol University, Bangkok 10400, Thailand.
- Center of Sustainable Energy and Green Materials, Mahidol University, Salaya, Nakhon Pathom 73170, Thailand
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5
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Reid AG, Moberg ME, Koellner CA, Machan CW, Thornton DA, Dickenson JC, Stober JJ, Turner DA, Tarring TJ, Brown CA, Harrison DP. Sterically attenuated electronic communication in cobalt complexes of meridional isoquinoline-derived ligands for applications in electrocatalysis. J Chem Phys 2023; 159:194306. [PMID: 37982482 DOI: 10.1063/5.0174177] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2023] [Accepted: 10/19/2023] [Indexed: 11/21/2023] Open
Abstract
The ability to synthetically tune the ligand frameworks of redox-active molecules is of critical importance to the economy of solar fuels because manipulating their redox properties can afford control over the operating potentials of sustained electrocatalytic or photoelectrocatalytic processes. The electronic and steric properties of 2,2':6',2″-terpyridine (Terpy) ligand frameworks can be tuned by functional group substitution on ligand backbones, and these correlate strongly to their Hammett parameters. The synthesis of a new series of tridentate meridional ligands of 2,4,6-trisubstituted pyridines that engineers the ability to finely tune the redox potentials of cobalt complexes to more positive potentials than that of their Terpy analogs is achieved by aryl-functionalizing at the four-position and by including isoquinoline at the two- and six-positions of pyridine (Aryl-DiQ). Their cobalt complex syntheses, their electronic properties, and their catalytic activity for carbon dioxide (CO2) reduction are reported and compared to their Terpy analogs. The cobalt derivatives generally experience a positive shift in their redox features relative to the Terpy-based analogs, covering a complementary potential range. Although those evaluated fail to produce any quantifiable products for the reduction of CO2 and suffer from long-term instability, these results suggest possible alternate strategies for stabilizing these compounds during catalysis. We speculate that lower equilibrium association constants to the cobalt center are intrinsic to these ligands, which originate from a steric interaction between protons on the pyridine and isoquinoline moieties. Nevertheless, the new Aryl-DiQ ligand framework has been engineered to selectively tune homoleptic cobalt complexes' redox potentials.
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Affiliation(s)
- Amelia G Reid
- Department of Chemistry, University of Virginia, Charlottesville, Virginia 22904-4319, USA
| | - Megan E Moberg
- Department of Chemistry, University of Virginia, Charlottesville, Virginia 22904-4319, USA
| | - Connor A Koellner
- Department of Chemistry, University of Virginia, Charlottesville, Virginia 22904-4319, USA
| | - Charles W Machan
- Department of Chemistry, University of Virginia, Charlottesville, Virginia 22904-4319, USA
| | - Diana A Thornton
- Virginia Tech, Department of Chemistry, Blacksburg, Virginia 24060, USA
| | - John C Dickenson
- Virginia Military Institute, Department of Chemistry, Lexington, Virginia 24450, USA
| | - Jeffry J Stober
- Virginia Military Institute, Department of Chemistry, Lexington, Virginia 24450, USA
| | - David A Turner
- Virginia Military Institute, Department of Chemistry, Lexington, Virginia 24450, USA
| | - Travis J Tarring
- Virginia Military Institute, Department of Chemistry, Lexington, Virginia 24450, USA
| | - Caleb A Brown
- Virginia Military Institute, Department of Chemistry, Lexington, Virginia 24450, USA
| | - Daniel P Harrison
- Virginia Military Institute, Department of Chemistry, Lexington, Virginia 24450, USA
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6
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Kulmaczewski R, Halcrow MA. Iron(II) complexes of 2,6-bis(imidazo[1,2- a]pyridin-2-yl)pyridine and related ligands with annelated distal heterocyclic donors. Dalton Trans 2023; 52:14928-14940. [PMID: 37799008 DOI: 10.1039/d3dt02747c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/07/2023]
Abstract
Following a published synthesis of 2,6-bis(imidazo[1,2-a]pyridin-2-yl)pyridine (L1), treatment of α,α'-dibromo-2,6-diacetylpyridine with 2 equiv. 2-aminopyrimidine or 2-aminoquinoline in refluxing acetonitrile respectively gives 2,6-bis(imidazo[1,2-a]pyrimidin-2-yl)pyridine (L2) and 2,6-bis(imidazo[1,2-a]quinolin-2-yl)pyridine (L3). Solvated crystals of [Fe(L1)2][BF4]2 (1[BF4]2) and [Fe(L2)2][BF4]2 (2[BF4]2) are mostly high-spin, although one solvate of 1[BF4]2 undergoes thermal spin-crossover on cooling. The iron coordination geometry is consistently distorted in crystals of 2[BF4]2 which may reflect the influence of intramolecular, inter-ligand N⋯π interactions on the molecular conformation. Only 1 : 1 Fe : L3 complexes were observed in solution, or isolated in the solid state; a crystal structure of [FeBr(py)2L3]Br·0.5H2O (py = pyridine) is presented. A solvate crystal structure of high-spin [Fe(L4)2][BF4]2 (L4 = 2,6-di{quinolin-2-yl}pyridine; 4[BF4]2) is also described, which exhibits a highly distorted six-coordinate geometry with a helical ligand conformation. The iron(II) complexes are high-spin in solution at room temperature, but 1[BF4]2 and 2[BF4]2 undergo thermal spin-crossover equilibria on cooling. All the compounds exhibit a ligand-based emission in solution at room temperature. Gas phase DFT calculations mostly reproduce the spin state properties of the complexes, but show small anomalies attributed to intramolecular, inter-ligand dispersion interactions in the sterically crowded molecules.
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Affiliation(s)
- Rafal Kulmaczewski
- School of Chemistry, University of Leeds, Woodhouse Lane, Leeds, UK LS2 9JT.
| | - Malcolm A Halcrow
- School of Chemistry, University of Leeds, Woodhouse Lane, Leeds, UK LS2 9JT.
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7
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Nößler M, Neuman NI, Böser L, Jäger R, Singha Hazari A, Hunger D, Pan Y, Lücke C, Bens T, van Slageren J, Sarkar B. Spin Crossover and Fluorine-Specific Interactions in Metal Complexes of Terpyridines with Polyfluorocarbon Tails. Chemistry 2023; 29:e202301246. [PMID: 37191067 DOI: 10.1002/chem.202301246] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2023] [Revised: 05/15/2023] [Accepted: 05/16/2023] [Indexed: 05/17/2023]
Abstract
In coordination chemistry and materials science, terpyridine ligands are of great interest, due to their ability to form stable complexes with a broad range of transition metal ions. We report three terpyridine ligands containing different perfluorocarbon (PFC) tails on the backbone and the corresponding FeII and CoII complexes. The CoII complexes display spin crossover close to ambient temperature, and the nature of this spin transition is influenced by the length of the PFC tail on the ligand backbone. The electrochemical properties of the metal complexes were investigated with cyclic voltammetry revealing one oxidation and several reduction processes. The fluorine-specific interactions were investigated by EPR measurements. Analysis of the EPR spectra of the complexes as microcrystalline powders and in solution reveals exchange-narrowed spectra without resolved hyperfine splittings arising from the 59 Co nucleus; this suggests complex aggregation in solution mediated by interactions of the PFC tails. Interestingly, addition of perfluoro-octanol in different ratios to the acetonitrile solution of the sample resulted in the disruption of the F ⋯ ${\cdots }$ F interactions of the tails. To the best of our knowledge, this is the first investigation of fluorine-specific interactions in metal complexes through EPR spectroscopy, as exemplified by exchange narrowing.
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Affiliation(s)
- Maite Nößler
- Institut für Chemie und Biochemie, Freie Universität Berlin, Fabeckstraße 34-36, 14195, Berlin, Germany
| | - Nicolás I Neuman
- Institut für Anorganische Chemie, Universität Stuttgart, Pfaffenwaldring 55, 70569, Stuttgart, Germany
- Instituto de Desarrollo Tecnológico para la Industria Química, INTEC, UNL-CONICET Predio CCT Conicet "Dr. Alberto Cassano", Colectora RN 168, Km 0, Paraje El Pozo, 3000, Santa Fe, Argentina
| | - Lisa Böser
- Institut für Chemie und Biochemie, Freie Universität Berlin, Fabeckstraße 34-36, 14195, Berlin, Germany
| | - René Jäger
- Institut für Chemie und Biochemie, Freie Universität Berlin, Fabeckstraße 34-36, 14195, Berlin, Germany
| | - Arijit Singha Hazari
- Institut für Anorganische Chemie, Universität Stuttgart, Pfaffenwaldring 55, 70569, Stuttgart, Germany
| | - David Hunger
- Institut für Physikalische Chemie, Universität Stuttgart, Pfaffenwaldring 55, 70569, Stuttgart, Germany
| | - Yixian Pan
- Institut für Physikalische Chemie, Universität Stuttgart, Pfaffenwaldring 55, 70569, Stuttgart, Germany
| | - Clemens Lücke
- Institut für Anorganische Chemie, Universität Stuttgart, Pfaffenwaldring 55, 70569, Stuttgart, Germany
| | - Tobias Bens
- Institut für Anorganische Chemie, Universität Stuttgart, Pfaffenwaldring 55, 70569, Stuttgart, Germany
| | - Joris van Slageren
- Institut für Physikalische Chemie, Universität Stuttgart, Pfaffenwaldring 55, 70569, Stuttgart, Germany
| | - Biprajit Sarkar
- Institut für Chemie und Biochemie, Freie Universität Berlin, Fabeckstraße 34-36, 14195, Berlin, Germany
- Institut für Anorganische Chemie, Universität Stuttgart, Pfaffenwaldring 55, 70569, Stuttgart, Germany
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8
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Kessler BJO, Mansoor IF, Wozniak DI, Emge TJ, Lipke MC. Controlling Intramolecular and Intermolecular Electronic Coupling of Radical Ligands in a Series of Cobaltoviologen Complexes. J Am Chem Soc 2023; 145:15924-15935. [PMID: 37460450 DOI: 10.1021/jacs.3c03725] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/27/2023]
Abstract
Controlling electronic coupling between multiple redox sites is of interest for tuning the electronic properties of molecules and materials. While classic mixed-valence (MV) systems are highly tunable, e.g., via the organic bridges connecting the redox sites, metal-bridged MV systems are difficult to control because the electronics of the metal cannot usually be altered independently of redox-active moieties embedded in its ligands. Herein, this limitation was overcome by varying the donor strengths of ancillary ligands in a series of cobalt complexes without directly perturbing the electronics of viologen-like redox sites bridged by the cobalt ions. The cobaltoviologens [1X-Co]n+ feature four 4-X-pyridyl donor groups (X = CO2Me, Cl, H, Me, OMe, NMe2) that provide gradual electronic tuning of the bridging CoII centers, while a related complex [2-Co]n+ with NHC donors supports exclusively CoIII states even upon reduction of the viologen units. Electrochemistry and IVCT band analysis indicate that the MV states of these complexes have electronic structures ranging from fully localized ([2-Co]4+; Robin-Day Class I) to fully delocalized ([1CO2Me-Co]3+; Class III) descriptions, demonstrating unprecedented control over electronic coupling without changing the identity of the redox sites or bridging metal. Additionally, single-crystal XRD characterization of the homovalent complexes [1H-Co]2+ and [1H-Zn]2+ revealed radical-pairing interactions between the viologen ligands of adjacent complexes, representing a type of through-space electronic coupling commonly observed for organic viologen radicals but never before seen in metalloviologens. The extended solid-state packing of these complexes produces 3D networks of radical π-stacking interactions that impart unexpected mechanical flexibility to these crystals.
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Affiliation(s)
- Brice J O Kessler
- Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, 123 Bevier Road, Piscataway, New Jersey 08854, United States
| | - Iram F Mansoor
- Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, 123 Bevier Road, Piscataway, New Jersey 08854, United States
| | - Derek I Wozniak
- Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, 123 Bevier Road, Piscataway, New Jersey 08854, United States
| | - Thomas J Emge
- Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, 123 Bevier Road, Piscataway, New Jersey 08854, United States
| | - Mark C Lipke
- Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, 123 Bevier Road, Piscataway, New Jersey 08854, United States
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9
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Fortea-Pérez FR, Vallejo J, Mastropietro TF, De Munno G, Rabelo R, Cano J, Julve M. Field-Induced Single-Ion Magnet Behavior in Nickel(II) Complexes with Functionalized 2,2':6'-2″-Terpyridine Derivatives: Preparation and Magneto-Structural Study. Molecules 2023; 28:molecules28114423. [PMID: 37298899 DOI: 10.3390/molecules28114423] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2023] [Revised: 05/23/2023] [Accepted: 05/23/2023] [Indexed: 06/12/2023] Open
Abstract
Two mononuclear nickel(II) complexes of the formula [Ni(terpyCOOH)2](ClO4)2∙4H2O (1) and [Ni(terpyepy)2](ClO4)2 MeOH (2) [terpyCOOH = 4'-carboxyl-2,2':6',2″-terpyridine and terpyepy = 4'-[(2-pyridin-4-yl)ethynyl]-2,2':6',2″-terpyridine] have been prepared and their structures determined by single-crystal X-ray diffraction. Complexes 1 and 2 are mononuclear compounds, where the nickel(II) ions are six-coordinate by the six nitrogen atoms from two tridentate terpy moieties. The mean values of the equatorial Ni-N bond distances [2.11(1) and 2.12(1) Å for Ni(1) at 1 and 2, respectively, are somewhat longer than the axial ones [2.008(6) and 2.003(6) Å (1)/2.000(1) and 1.999(1) Å (2)]. The values of the shortest intermolecular nickel-nickel separation are 9.422(1) (1) and 8.901(1) Å (2). Variable-temperature (1.9-200 K) direct current (dc) magnetic susceptibility measurements on polycrystalline samples of 1 and 2 reveal a Curie law behavior in the high-temperature range, which corresponds to magnetically isolated spin triplets, the downturn of the χMT product at lower temperatures being due to zero-field splitting effects (D). Values of D equal to -6.0 (1) and -4.7 cm-1 (2) were obtained through the joint analysis of the magnetic susceptibility data and the field dependence of the magnetization. These results from magnetometry were supported by theoretical calculations. Alternating current (ac) magnetic susceptibility measurements of 1 and 2 in the temperature range 2.0-5.5 K show the occurrence of incipient out-phase signals under applied dc fields, a phenomenon that is characteristic of field-induced Single-Molecule Magnet (SMM) behavior, which herein concerns the 2 mononuclear nickel(II) complexes. This slow relaxation of the magnetization in 1 and 2 has its origin in the axial compression of the octahedral surrounding at their nickel(II) ions that leads to negative values of D. A combination of an Orbach and a direct mechanism accounts for the field-dependent relation phenomena in 1 and 2.
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Affiliation(s)
- Francisco Ramón Fortea-Pérez
- Instituto de Ciencia Molecular (ICMol), Departament de Química Inorgànica, Universitat de València, 46980 Paterna, Spain
| | - Julia Vallejo
- Instituto de Ciencia Molecular (ICMol), Departament de Química Inorgànica, Universitat de València, 46980 Paterna, Spain
| | - Teresa F Mastropietro
- Dipartimento di Chimica e Tecnologie Chimiche, Università della Calabria, 87036 Rende, Italy
| | - Giovanni De Munno
- Dipartimento di Chimica e Tecnologie Chimiche, Università della Calabria, 87036 Rende, Italy
| | - Renato Rabelo
- Instituto de Ciencia Molecular (ICMol), Departament de Química Inorgànica, Universitat de València, 46980 Paterna, Spain
- Instituto de Química, Universidade Federal de Goiás, Goiânia 74690-900, Brazil
| | - Joan Cano
- Instituto de Ciencia Molecular (ICMol), Departament de Química Inorgànica, Universitat de València, 46980 Paterna, Spain
| | - Miguel Julve
- Instituto de Ciencia Molecular (ICMol), Departament de Química Inorgànica, Universitat de València, 46980 Paterna, Spain
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10
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Suhr S, Schröter N, Kleoff M, Neuman N, Hunger D, Walter R, Lücke C, Stein F, Demeshko S, Liu H, Reissig HU, van Slageren J, Sarkar B. Spin State in Homoleptic Iron(II) Terpyridine Complexes Influences Mixed Valency and Electrocatalytic CO 2 Reduction. Inorg Chem 2023; 62:6375-6386. [PMID: 37043797 DOI: 10.1021/acs.inorgchem.3c00253] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/14/2023]
Abstract
Two homoleptic Fe(II) complexes in different spin states bearing superbasic terpyridine derivatives as ligands are investigated to determine the relationship between spin state and electrochemical/spectroscopic behavior. Antiferromagnetic coupling between a ligand-centered radical and the high-spin metal center leads to an anodic shift of the first reduction potential and results in a species that shows mixed valency with a moderately intense intervalence-charge-transfer band. The differences afforded by the different spin states extend to the electrochemical reactivity of the complexes: while the low-spin species is a precatalyst for electrocatalytic CO2 reduction and leads to the preferential formation of CO with a Faradaic efficiency of 37%, the high-spin species only catalyzes proton reduction at a modest Faradaic efficiency of approximately 20%.
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Affiliation(s)
- Simon Suhr
- Institut für Anorganische Chemie, Universität Stuttgart, Pfaffenwaldring 55, 70569 Stuttgart, Germany
| | - Nicolai Schröter
- Institut für Anorganische Chemie, Universität Stuttgart, Pfaffenwaldring 55, 70569 Stuttgart, Germany
| | - Merlin Kleoff
- Institut für Chemie und Biochemie, Freie Universität Berlin, Takustraße 3, 14195 Berlin, Germany
| | - Nicolas Neuman
- Instituto de Desarrollo Tecnológico para la Industria Química - INTEC, UNL-CONICET, CCT-CONICET Santa Fe, S3000ZAA Santa Fe, Santa Fe, Argentina
| | - David Hunger
- Institut für Physikalische Chemie, Universität Stuttgart, Pfaffenwaldring 55, 70569 Stuttgart, Germany
| | - Robert Walter
- Institut für Anorganische Chemie, Universität Stuttgart, Pfaffenwaldring 55, 70569 Stuttgart, Germany
| | - Clemens Lücke
- Institut für Anorganische Chemie, Universität Stuttgart, Pfaffenwaldring 55, 70569 Stuttgart, Germany
| | - Felix Stein
- Institut für Anorganische Chemie, Universität Stuttgart, Pfaffenwaldring 55, 70569 Stuttgart, Germany
| | - Serhiy Demeshko
- Institut für Anorganische Chemie, Georg-August Universität Göttingen, Tammannstraße 4, 37077 Göttingen, Germany
| | - Hang Liu
- Institut für Technische Chemie, Universität Stuttgart, Pfaffenwaldring 55, 70569 Stuttgart, Germany
| | - Hans-Ulrich Reissig
- Institut für Chemie und Biochemie, Freie Universität Berlin, Takustraße 3, 14195 Berlin, Germany
| | - Joris van Slageren
- Institut für Physikalische Chemie, Universität Stuttgart, Pfaffenwaldring 55, 70569 Stuttgart, Germany
| | - Biprajit Sarkar
- Institut für Anorganische Chemie, Universität Stuttgart, Pfaffenwaldring 55, 70569 Stuttgart, Germany
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11
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Conradie J, Erasmus E. Cobalt complexes with multi-dentate N-donor ligands: Redox, X-ray Photoelectron Spectroscopic and theoretical study. RESULTS IN CHEMISTRY 2023. [DOI: 10.1016/j.rechem.2023.100818] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023] Open
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12
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Raithel AL, Meador WE, Kim TY, Staples RJ, Delcamp JH, Hamann TW. Molecular Switch Cobalt Redox Shuttle with a Tunable Hexadentate Ligand. J Am Chem Soc 2023; 145:1367-1377. [PMID: 36595559 DOI: 10.1021/jacs.2c12017] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Strong-field hexadentate ligands were synthesized and coordinated to cobalt metal centers to result in three new low-spin to low-spin Co(III/II) redox couples. The ligand backbone has been modified with dimethyl amine groups to result in redox potential tuning of the Co(III/II) redox couples from -200 to -430 mV versus Fc+/0. The redox couples surprisingly undergo a reversible molecular switch rearrangement from five-coordinate Co(II) to six-coordinate Co(III) despite the ligands being hexadentate. The complexes exhibit modestly faster electron self-exchange rate constants of 2.2-4.2 M-1 s-1 compared to the high-spin to low-spin redox couple [Co(bpy)3]3+/2+ at 0.27 M-1 s-1, which is attributed to the change in spin state being somewhat offset by this coordination switching behavior. The complexes were utilized as redox shuttles in dye-sensitized solar cells with the near-IR AP25 + D35 dye system and exhibited improved photocurrents over the [Co(bpy)3]3+/2+ redox shuttle (19.8 vs 18.0 mA/cm2). Future directions point toward pairing the low-spin to low-spin Co(II/III) tunable series to dyes with significantly more negative highest occupied molecular orbital potentials that absorb into the near-IR where outer sphere redox shuttles have failed to produce efficient dye regeneration.
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Affiliation(s)
- Austin L Raithel
- Department of Chemistry, Michigan State University, 578 S Shaw Lane, East Lansing, Michigan48823, United States
| | - William E Meador
- Department of Chemistry and Biochemistry, Coulter Hall, University of Mississippi, University, Mississippi38677, United States
| | - Tea-Yon Kim
- Department of Chemistry, Michigan State University, 578 S Shaw Lane, East Lansing, Michigan48823, United States
| | - Richard J Staples
- Department of Chemistry, Michigan State University, 578 S Shaw Lane, East Lansing, Michigan48823, United States
| | - Jared H Delcamp
- UES, Inc. Research Scientist, Air Force Research Labs, Materials and Manufacturing Directorate, 2230 Tenth Street B655 R198, WPAFB, Ohio45433-7817, United States
| | - Thomas W Hamann
- Department of Chemistry, Michigan State University, 578 S Shaw Lane, East Lansing, Michigan48823, United States
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13
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Huang YL, Zhong YJ, Ye HJ, Li YH, Kuang XM, Ouyang ZJ, Chen WB, Yang M, Dong W. Slow magnetic relaxation and spin crossover behavior in two mixed-valence Co( ii)/Co( iii) complexes. NEW J CHEM 2022. [DOI: 10.1039/d2nj03051a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Two mixed-valence Co(ii)/Co(iii) complexes of [CoII(phen)3][CoIII(HATD)2]2·3DMA·3.5H2O (1) with field induced single-molecule magnet behavior, and [CoII(terpy)2][CoIII(HATD)2]2·4DMA·H2O (2) with a gradual thermal spin crossover (SCO).
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Affiliation(s)
- You-Lin Huang
- Guangzhou Key Laboratory for Environmentally Functional Materials and Technology, School of Chemistry and Chemical Engineering, Guangzhou University, Guangzhou 510006, P. R. China
| | - Yun-Jing Zhong
- Guangzhou Key Laboratory for Environmentally Functional Materials and Technology, School of Chemistry and Chemical Engineering, Guangzhou University, Guangzhou 510006, P. R. China
| | - Hua-Jian Ye
- Guangzhou Key Laboratory for Environmentally Functional Materials and Technology, School of Chemistry and Chemical Engineering, Guangzhou University, Guangzhou 510006, P. R. China
| | - You-Hong Li
- Guangzhou Key Laboratory for Environmentally Functional Materials and Technology, School of Chemistry and Chemical Engineering, Guangzhou University, Guangzhou 510006, P. R. China
| | - Xiao-Man Kuang
- Guangzhou Key Laboratory for Environmentally Functional Materials and Technology, School of Chemistry and Chemical Engineering, Guangzhou University, Guangzhou 510006, P. R. China
| | - Zhi-Jian Ouyang
- Guangzhou Key Laboratory for Environmentally Functional Materials and Technology, School of Chemistry and Chemical Engineering, Guangzhou University, Guangzhou 510006, P. R. China
| | - Wen-Bin Chen
- Guangzhou Key Laboratory for Environmentally Functional Materials and Technology, School of Chemistry and Chemical Engineering, Guangzhou University, Guangzhou 510006, P. R. China
| | - Meng Yang
- Guangzhou Key Laboratory for Environmentally Functional Materials and Technology, School of Chemistry and Chemical Engineering, Guangzhou University, Guangzhou 510006, P. R. China
| | - Wen Dong
- Guangzhou Key Laboratory for Environmentally Functional Materials and Technology, School of Chemistry and Chemical Engineering, Guangzhou University, Guangzhou 510006, P. R. China
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14
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Taniya OS, Kopchuk DS, Khasanov AF, S.Kovalev I, Santra S, Zyryanov GV, Majee A, Charushin VN, Chupakhin ON. Synthetic approaches and supramolecular properties of 2,2′:n′,m″-terpyridine domains (n = 3,4,5,6; m = 2,3,4) based on the 2,2′-bipyridine core as ligands with k2N-bidentate coordination mode. Coord Chem Rev 2021. [DOI: 10.1016/j.ccr.2021.213980] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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15
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Dickenson JC, Haley ME, Hyde JT, Reid ZM, Tarring TJ, Iovan DA, Harrison DP. Fine-Tuning Metal and Ligand-Centered Redox Potentials of Homoleptic Bis-Terpyridine Complexes with 4'-Aryl Substituents. Inorg Chem 2021; 60:9956-9969. [PMID: 34160216 DOI: 10.1021/acs.inorgchem.1c01233] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Homoleptic transition-metal complexes of 2,2':6',2″-terpyridine (terpy) and substituted derivatives of the form [M(R-terpy)2]2+ display a wide range of redox potentials that correlate well to the Hammett parameter of the terpy substituents. Less is known about the impact of incorporating a phenyl spacer between the functional group responsible for controlling the electron density of terpy and how that translates to metal complexes of the form [M(4'-aryl-terpy)2]2+, where M = Mn, Fe, Co, Ni, and Zn. Herein, we report our studies on these complexes revealed a good correlation of redox potentials of both metal- and ligand-centered events with the Hammett parameters of the aryl substituents, regardless of aryl-substitution pattern (i.e., the presence of multiple functional groups, combinations of withdrawing and donating functional groups). The phenyl spacer results in 60-80% attenuation of electron density as compared to the 4'-substituted terpy analogue, depending on the metal and redox couple analyzed. Density functional theory calculations performed on a simple model system revealed a strong correlation between the Hammett parameters and lowest unoccupied molecular orbital energies of the corresponding substituted pyridine models, thus serving as an inexpensive predictive tool when coupled with electrochemical data. Overall, these data suggest that such ligand modifications may be used in combination with previous approaches to further fine-tune the redox potentials of homoleptic transition-metal complexes, which may have applications in photochemical and electrochemical catalytic processes.
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Affiliation(s)
- John C Dickenson
- Virginia Military Institute, Department of Chemistry, Lexington, Virginia 24450, United States
| | - MacKenzie E Haley
- Virginia Military Institute, Department of Chemistry, Lexington, Virginia 24450, United States
| | - Jacob T Hyde
- Virginia Military Institute, Department of Chemistry, Lexington, Virginia 24450, United States
| | - Zachary M Reid
- Virginia Military Institute, Department of Chemistry, Lexington, Virginia 24450, United States
| | - Travis J Tarring
- Virginia Military Institute, Department of Chemistry, Lexington, Virginia 24450, United States
| | - Diana A Iovan
- Virginia Tech, Department of Chemistry, Blacksburg, Virginia 24060, United States
| | - Daniel P Harrison
- Virginia Military Institute, Department of Chemistry, Lexington, Virginia 24450, United States
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16
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Choi J, Kim SH, Lee Y. Axial Redox Tuning at a Tetragonal Cobalt Center. Inorg Chem 2021; 60:5647-5659. [PMID: 33788551 DOI: 10.1021/acs.inorgchem.0c03676] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Square pyramidal cobalt complexes were prepared to study their multielectron redox properties. To build a stable redox-active cobalt complex, the combination of a tridentate acriPNP (acriPNP- = 4,5-bis(diisopropylphosphino)-2,7,9,9-tetramethyl-9H-acridin-10-ide) ligand with a bidentate ligand, such as 2,2'-bipyridine, 2-(o-phenyl)pyridine, biphenylene, and their analogues, was employed. In a cobalt complex having a tetragonal structure, the dx2-y2 orbital possesses an antibonding character and must remain empty for its structural integrity, while the dz2 orbital acts as a redox-active frontier molecular orbital (FMO). Tuning the redox potential of the Co(II/I) couple was successfully achieved by introducing a different axial donor. The reduction of Co(II) to Co(I) occurs at -2.6 V for a neutral donor but shifts to -3.4 V for an anionic donor. Since the redox-active dz2 orbital is close in energy to other ligand-based orbitals, multielectron redox activity is also observed. Electrochemical measurements indicate three reversible redox events within a window of -3.0-0.0 V vs Fc/Fc+ in tetrahydrofuran (THF). These redox processes are fully reversible for over 100 cycles, reflecting the electrochemical stability of these cobalt complexes. Surprisingly, the oxidation potential of the acriPNP ligand varies dramatically from +0.15 to -2.4 V, which is probably due to the cobalt contribution on the amido-based molecular orbital. The electronic structure of the cobalt complexes was examined structurally, spectroscopically, and theoretically.
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Affiliation(s)
- Jonghoon Choi
- Department of Chemistry, Seoul National University, Seoul 08826, Republic of Korea
| | - Sun Hee Kim
- Western Seoul Center, Korea Basic Science Institute, Seoul 03759, Republic of Korea
| | - Yunho Lee
- Department of Chemistry, Seoul National University, Seoul 08826, Republic of Korea
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17
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Ruan G, Engelberg L, Ghosh P, Maayan G. A unique Co(iii)-peptoid as a fast electrocatalyst for homogeneous water oxidation with low overpotential. Chem Commun (Camb) 2021; 57:939-942. [DOI: 10.1039/d0cc06912d] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A peptoid trimer incorporating terpyridine and ethanol forms an intermolecular cobalt(iii) complex, which performs as a soluble electrocatalyst for water oxidation with a minimal overpotential of 350 mV and a high turnover frequency of 108 s−1.
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Affiliation(s)
- Guilin Ruan
- Schulich Faculty of Chemistry
- Technion – Israel Institute of Technology
- Haifa
- Israel
| | - Lee Engelberg
- Schulich Faculty of Chemistry
- Technion – Israel Institute of Technology
- Haifa
- Israel
| | - Pritam Ghosh
- Schulich Faculty of Chemistry
- Technion – Israel Institute of Technology
- Haifa
- Israel
| | - Galia Maayan
- Schulich Faculty of Chemistry
- Technion – Israel Institute of Technology
- Haifa
- Israel
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18
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Mansoor IF, Wozniak DI, Wu Y, Lipke MC. A delocalized cobaltoviologen with seven reversibly accessible redox states and highly tunable electrochromic behaviour. Chem Commun (Camb) 2020; 56:13864-13867. [PMID: 33089836 DOI: 10.1039/d0cc05627h] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
CoII mediates electronic coupling between two N-Me-pyridinium-terpyridine ligands that are related to redox-active N,N-dialkyl-4,4'-bipyridinium dications (viologens). Borderline Class II/III electronic delocalization imparts the cobaltoviologen complex with distinct electronic properties (e.g., 7 accessible redox states) relative to those of viologens, leading to enhanced electrochromism.
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Affiliation(s)
- Iram F Mansoor
- Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, 123 Bevier Road, Piscataway, New Jersey 08854, USA.
| | - Derek I Wozniak
- Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, 123 Bevier Road, Piscataway, New Jersey 08854, USA.
| | - Yilei Wu
- Department of Chemical Engineering, Stanford University, Stanford, California 94305-4125, USA
| | - Mark C Lipke
- Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, 123 Bevier Road, Piscataway, New Jersey 08854, USA.
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19
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Padhi SK, Ahmad E, Rai S. Kinetics and the potential well in electrochemical hydrogen evolution by [Co(4-tolyl-tpy)2]2+. Electrochim Acta 2020. [DOI: 10.1016/j.electacta.2020.136000] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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20
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21
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Recent advances in the chemistry of group 9—Pincer organometallics. ADVANCES IN ORGANOMETALLIC CHEMISTRY 2020. [DOI: 10.1016/bs.adomc.2019.09.002] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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22
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Budnikova Y, Bochkova O, Khrizanforov M, Nizameev I, Kholin K, Gryaznova T, Laskin A, Dudkina Y, Strekalova S, Fedorenko S, Kononov A, Mustafina A. Selective C(sp2)‐H Amination Catalyzed by High‐Valent Cobalt(III)/(IV)‐bpy Complex Immobilized on Silica Nanoparticles. ChemCatChem 2019. [DOI: 10.1002/cctc.201901391] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Yulia Budnikova
- Arbuzov Institute of Organic and Physical ChemistryFRC Kazan Scientific Center, Russian Academy of Sciences 420088 Arbuzov str. 8 Kazan Russian Federation
| | - Olga Bochkova
- Arbuzov Institute of Organic and Physical ChemistryFRC Kazan Scientific Center, Russian Academy of Sciences 420088 Arbuzov str. 8 Kazan Russian Federation
| | - Mikhail Khrizanforov
- Arbuzov Institute of Organic and Physical ChemistryFRC Kazan Scientific Center, Russian Academy of Sciences 420088 Arbuzov str. 8 Kazan Russian Federation
| | - Irek Nizameev
- Arbuzov Institute of Organic and Physical ChemistryFRC Kazan Scientific Center, Russian Academy of Sciences 420088 Arbuzov str. 8 Kazan Russian Federation
| | - Kirill Kholin
- Arbuzov Institute of Organic and Physical ChemistryFRC Kazan Scientific Center, Russian Academy of Sciences 420088 Arbuzov str. 8 Kazan Russian Federation
| | - Tatyana Gryaznova
- Arbuzov Institute of Organic and Physical ChemistryFRC Kazan Scientific Center, Russian Academy of Sciences 420088 Arbuzov str. 8 Kazan Russian Federation
| | - Artem Laskin
- Kazan Federal University Kremlevskaya str. 29/1 Kazan 420008 Russian Federation
| | - Yulia Dudkina
- Arbuzov Institute of Organic and Physical ChemistryFRC Kazan Scientific Center, Russian Academy of Sciences 420088 Arbuzov str. 8 Kazan Russian Federation
| | - Sofia Strekalova
- Arbuzov Institute of Organic and Physical ChemistryFRC Kazan Scientific Center, Russian Academy of Sciences 420088 Arbuzov str. 8 Kazan Russian Federation
| | - Svetlana Fedorenko
- Arbuzov Institute of Organic and Physical ChemistryFRC Kazan Scientific Center, Russian Academy of Sciences 420088 Arbuzov str. 8 Kazan Russian Federation
| | - Aleksandr Kononov
- Arbuzov Institute of Organic and Physical ChemistryFRC Kazan Scientific Center, Russian Academy of Sciences 420088 Arbuzov str. 8 Kazan Russian Federation
| | - Asia Mustafina
- Arbuzov Institute of Organic and Physical ChemistryFRC Kazan Scientific Center, Russian Academy of Sciences 420088 Arbuzov str. 8 Kazan Russian Federation
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23
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Kottelat E, Lucarini F, Crochet A, Ruggi A, Zobi F. Correlation of MLCTs of Group 7 fac
-[M(CO)3
]+
Complexes (M = Mn, Re) with Bipyridine, Pyridinylpyrazine, Azopyridine, and Pyridin-2-ylmethanimine Type Ligands for Rational photoCORM Design. Eur J Inorg Chem 2019. [DOI: 10.1002/ejic.201900568] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Emmanuel Kottelat
- Department of Chemistry; Faculty of Sciences; University of Fribourg; Chemin de Musée 9, 1700 Fribourg Switzerland
| | - Fiorella Lucarini
- Department of Chemistry; Faculty of Sciences; University of Fribourg; Chemin de Musée 9, 1700 Fribourg Switzerland
| | - Aurelien Crochet
- Department of Chemistry; Faculty of Sciences; University of Fribourg; Chemin de Musée 9, 1700 Fribourg Switzerland
| | - Albert Ruggi
- Department of Chemistry; Faculty of Sciences; University of Fribourg; Chemin de Musée 9, 1700 Fribourg Switzerland
| | - Fabio Zobi
- Department of Chemistry; Faculty of Sciences; University of Fribourg; Chemin de Musée 9, 1700 Fribourg Switzerland
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24
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Dong CP, Kodama S, Nomoto A, Ueshima M, Ogawa A. 4,6-Dihydroxysalicylic Acid-Catalyzed Oxidative Condensation of Benzylic Amines and Aromatic Ketones for the Preparation of 2,4,6-Trisubstituted Pyridines and Its Application to Metal-Free Synthesis of G-Quadruplex Binding Ligands. ACS OMEGA 2019; 4:9029-9040. [PMID: 31459991 PMCID: PMC6648211 DOI: 10.1021/acsomega.9b00999] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/08/2019] [Accepted: 05/08/2019] [Indexed: 05/08/2023]
Abstract
4,6-Dihydroxysalicylic acid was activated under air to catalyze the one-pot oxidative condensation reaction of benzylamines with acetophenones in the presence of BF3·Et2O, affording 2,4,6-trisubstituted pyridines in yields of 59-91%. During this metal-free oxidative condensation reaction, the benzylamines not only provided the aryl moiety at the 4-position of the pyridines but also acted as the nitrogen donor. This method can be applied to the metal-free synthesis of G-quadruplex binding ligands by the sequential addition of 4-chlorobutyryl chloride and pyrrolidine to the reaction system of the 2,4,6-trisubstituted pyridine synthesis.
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25
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Kleoff M, Suhr S, Sarkar B, Zimmer R, Reissig H, Marin‐Luna M, Zipse H. Efficient Syntheses of New Super Lewis Basic Tris(dialkylamino)‐Substituted Terpyridines and Comparison of Their Methyl Cation Affinities. Chemistry 2019; 25:7526-7533. [DOI: 10.1002/chem.201900450] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2019] [Revised: 03/27/2019] [Indexed: 12/16/2022]
Affiliation(s)
- Merlin Kleoff
- Institut für Chemie und BiochemieFreie Universität Berlin Takustr. 3 14195 Berlin Germany
| | - Simon Suhr
- Institut für Chemie und BiochemieFreie Universität BerlinAnorganische Chemie Fabeckstr. 34–36 14195 Berlin Germany
| | - Biprajit Sarkar
- Institut für Chemie und BiochemieFreie Universität BerlinAnorganische Chemie Fabeckstr. 34–36 14195 Berlin Germany
| | - Reinhold Zimmer
- Institut für Chemie und BiochemieFreie Universität Berlin Takustr. 3 14195 Berlin Germany
| | - Hans‐Ulrich Reissig
- Institut für Chemie und BiochemieFreie Universität Berlin Takustr. 3 14195 Berlin Germany
| | - Marta Marin‐Luna
- Department ChemieLudwig-Maximilians-Universität München Butenandtstr. 5–13 81377 München Germany
| | - Hendrik Zipse
- Department ChemieLudwig-Maximilians-Universität München Butenandtstr. 5–13 81377 München Germany
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26
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Todorova TK, Huan TN, Wang X, Agarwala H, Fontecave M. Controlling Hydrogen Evolution during Photoreduction of CO 2 to Formic Acid Using [Rh(R-bpy)(Cp*)Cl] + Catalysts: A Structure-Activity Study. Inorg Chem 2019; 58:6893-6903. [PMID: 31050296 DOI: 10.1021/acs.inorgchem.9b00371] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
The photochemical reduction of CO2 to formic acid catalyzed by a series of [Rh(4,4'-R-bpy)(Cp*)Cl]+ and [Rh(5,5'-COOH-bpy)(Cp*)Cl]+ complexes (Cp* = pentamethylcyclopentadienyl, bpy = 2,2'-bipyridine, and R = OCH3, CH3, H, COOC2H5, CF3, NH2, or COOH) was studied to assess how modifications in the electronic structure of the catalyst affect its selectivity, defined as the HCOOH:H2 product ratio. A direct molecular-level influence of the functional group on the initial reaction rate for CO2 versus proton reduction reactions was established. Density functional theory computations elucidated for the first time the respective role of the [RhH] and [Cp*H] tautomers, recognizing rhodium hydride as the key player for both reactions. In particular, our calculations explain the observed tendency of electron-donating substituents to favor CO2 reduction by means of decreasing the hydricity of the Rh-H bond, resulting in a lower hydride transfer barrier toward formic acid production as compared to substituents with an electron-withdrawing nature that favor more strongly the reduction of protons to hydrogen.
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Affiliation(s)
- Tanya K Todorova
- Laboratoire de Chimie des Processus Biologiques, UMR 8229 CNRS, Collège de France , Université Paris 6 , 11 Place Marcelin Berthelot , 75231 Paris Cedex 05, France
| | - Tran Ngoc Huan
- Laboratoire de Chimie des Processus Biologiques, UMR 8229 CNRS, Collège de France , Université Paris 6 , 11 Place Marcelin Berthelot , 75231 Paris Cedex 05, France
| | - Xia Wang
- Laboratoire de Chimie des Processus Biologiques, UMR 8229 CNRS, Collège de France , Université Paris 6 , 11 Place Marcelin Berthelot , 75231 Paris Cedex 05, France
| | - Hemlata Agarwala
- Laboratoire de Chimie des Processus Biologiques, UMR 8229 CNRS, Collège de France , Université Paris 6 , 11 Place Marcelin Berthelot , 75231 Paris Cedex 05, France
| | - Marc Fontecave
- Laboratoire de Chimie des Processus Biologiques, UMR 8229 CNRS, Collège de France , Université Paris 6 , 11 Place Marcelin Berthelot , 75231 Paris Cedex 05, France
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McPherson JN, Hogue RW, Akogun FS, Bondì L, Luis ET, Price JR, Garden AL, Brooker S, Colbran SB. Predictable Substituent Control of Co III/II Redox Potential and Spin Crossover in Bis(dipyridylpyrrolide)cobalt Complexes. Inorg Chem 2019; 58:2218-2228. [PMID: 30672281 DOI: 10.1021/acs.inorgchem.8b03457] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A family of five easily prepared tridentate monoanionic 2,5-dipyridyl-3-(R1)-4-(R2)-pyrrolide anions (dppR1,R2)-, varying in the nature of the R1 and R2 substituents [R1, R2 = CN, Ph; CO2Et, CO2Et; CO2Me, 4-Py; CO2Me, Me; Me, Me], has been used to generate the analogous family of neutral [CoII(dppR1,R2)2] complexes, two of which are structurally characterized at both 100 and 298 K. Both the oxidation and spin states of these complexes can be switched in response to appropriate external stimuli. All complexes, except [CoII(dppMe,Me)2], exhibit gradual spin crossover (SCO) in the solid state, and SCO activity is observed for three complexes in CDCl3 solution. The cobalt(II) centers in the low spin (LS) complexes are Jahn-Teller tetragonally compressed along the pyrrolide-Co-pyrrolide axis. The complexes in their high spin (HS) states are more distorted than in the LS states, as is also usually the case for SCO active iron(II) complexes. The reversible CoIII/II redox potentials are predictably tuned by choice of substituents R1 and R2, from -0.95 (Me,Me) to -0.45 (CN,Ph) V vs Fc+/Fc, with a linear correlation observed between E1/2(CoIII/II) and the Swain-Lupton parameters of the pyrrolide substituents.
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Affiliation(s)
- James N McPherson
- School of Chemistry , The University of New South Wales , Kensington , NSW 2052 , Australia
| | - Ross W Hogue
- Department of Chemistry and MacDiarmid Institute for Advanced Materials and Nanotechnology , University of Otago , P.O. Box 56, Dunedin 9054 , New Zealand
| | - Folaranmi Sunday Akogun
- Department of Chemistry and MacDiarmid Institute for Advanced Materials and Nanotechnology , University of Otago , P.O. Box 56, Dunedin 9054 , New Zealand
| | - Luca Bondì
- Department of Chemistry and MacDiarmid Institute for Advanced Materials and Nanotechnology , University of Otago , P.O. Box 56, Dunedin 9054 , New Zealand
| | - Ena T Luis
- School of Chemistry , The University of New South Wales , Kensington , NSW 2052 , Australia
| | - Jason R Price
- ANSTO, Australian Synchrotron , Clayton , VIC Australia
| | - Anna L Garden
- Department of Chemistry and MacDiarmid Institute for Advanced Materials and Nanotechnology , University of Otago , P.O. Box 56, Dunedin 9054 , New Zealand
| | - Sally Brooker
- Department of Chemistry and MacDiarmid Institute for Advanced Materials and Nanotechnology , University of Otago , P.O. Box 56, Dunedin 9054 , New Zealand
| | - Stephen B Colbran
- School of Chemistry , The University of New South Wales , Kensington , NSW 2052 , Australia
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Ferreira H, Conradie MM, Conradie J. Electrochemical and electronic properties of a series of substituted polypyridine ligands and their Co(II) complexes. Inorganica Chim Acta 2019. [DOI: 10.1016/j.ica.2018.10.020] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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29
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Electrochemical properties of a series of Co(II) complexes, containing substituted phenanthrolines. Electrochim Acta 2018. [DOI: 10.1016/j.electacta.2018.09.151] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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30
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Drath O, Gable RW, Moubaraki B, Murray KS, Boskovic C. Synthesis and properties of cobalt(II) coordination polymers linked by 4′-(4-pyridyl)-2,2′:6′,2″-terpyridine. Polyhedron 2018. [DOI: 10.1016/j.poly.2018.05.052] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
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31
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Wang P, Liang G, Reddy MR, Long M, Driskill K, Lyons C, Donnadieu B, Bollinger JC, Webster CE, Zhao X. Electronic and Steric Tuning of Catalytic H2 Evolution by Cobalt Complexes with Pentadentate Polypyridyl-Amine Ligands. J Am Chem Soc 2018; 140:9219-9229. [DOI: 10.1021/jacs.8b05108] [Citation(s) in RCA: 67] [Impact Index Per Article: 11.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Ping Wang
- Department of Chemistry, The University of Memphis, Memphis, Tennessee 38152, United States
| | - Guangchao Liang
- Department of Chemistry, Mississippi State University, Mississippi State, Mississippi 39762, United States
| | - M. Ramana Reddy
- Department of Chemistry, The University of Memphis, Memphis, Tennessee 38152, United States
| | - Melissa Long
- Department of Chemistry, The University of Memphis, Memphis, Tennessee 38152, United States
| | - Kandria Driskill
- Department of Chemistry & Department of Biological Sciences, Arkansas State University, Jonesboro, Arkansas 72401, United States
| | - Christian Lyons
- Department of Chemistry, Christian Brother University, Memphis, Tennessee 38104, United States
| | - Bruno Donnadieu
- Department of Chemistry, Mississippi State University, Mississippi State, Mississippi 39762, United States
| | - John C. Bollinger
- Structural Biology X-Ray Diffraction Laboratory, St. Jude Children’s Research Hospital, Memphis, Tennessee 38105, United States
| | - Charles Edwin Webster
- Department of Chemistry, Mississippi State University, Mississippi State, Mississippi 39762, United States
| | - Xuan Zhao
- Department of Chemistry, The University of Memphis, Memphis, Tennessee 38152, United States
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32
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Liu FW, Bi J, Sun Y, Luo S, Kang P. Cobalt Complex with Redox-Active Imino Bipyridyl Ligand for Electrocatalytic Reduction of Carbon Dioxide to Formate. CHEMSUSCHEM 2018; 11:1656-1663. [PMID: 29577653 DOI: 10.1002/cssc.201800136] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/21/2018] [Revised: 03/23/2018] [Indexed: 06/08/2023]
Abstract
An imino bipyridine cobalt(II) complex was developed for the electrocatalytic reduction of CO2 to formate in acetonitrile with a faradaic efficiency of approximately 80 %. For comparison, a symmetric bis-imino pyridine complex showed lower catalytic activity because of less conjugation in the system. Cyclic voltammetry, electron paramagnetic resonance and IR spectroscopy studies provided mechanistic details and the structures of the key intermediates. DFT calculations confirmed the role of large π-conjugated groups for stabilizing key intermediates through electronic conjugation.
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Affiliation(s)
- Fang-Wei Liu
- Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, 29 Zhongguancun East Rd, Beijing, 100190, PR China
- University of Chinese Academy of Sciences, 19A Yuquan Rd, Beijing, 100049, PR China
| | - Jiaojiao Bi
- Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, 29 Zhongguancun East Rd, Beijing, 100190, PR China
- University of Chinese Academy of Sciences, 19A Yuquan Rd, Beijing, 100049, PR China
| | - Yuanyuan Sun
- State Key Laboratory Breeding Base of Green Chemistry-Synthesis Technology, Zhejiang University of Technology, Chaowang Road 18, Hangzhou, 310014, PR China
| | - Shuping Luo
- State Key Laboratory Breeding Base of Green Chemistry-Synthesis Technology, Zhejiang University of Technology, Chaowang Road 18, Hangzhou, 310014, PR China
| | - Peng Kang
- Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, 29 Zhongguancun East Rd, Beijing, 100190, PR China
- School of Chemical Engineering and Technology, Tianjin University, 135 Yaguan Rd, Tianjin, 300350, PR China
- University of Chinese Academy of Sciences, 19A Yuquan Rd, Beijing, 100049, PR China
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33
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Cobalt(II) Terpyridin-4′-yl Nitroxide Complex as an Exchange-Coupled Spin-Crossover Material. CRYSTALS 2018. [DOI: 10.3390/cryst8040155] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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34
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Huang W, Li Y, Yong J, Liu Y, Wu D. Hydrazone-based cobalt complexes toward multielectron redox and spin crossover. RSC Adv 2018; 8:17159-17167. [PMID: 35539225 PMCID: PMC9081832 DOI: 10.1039/c8ra02963f] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2018] [Accepted: 04/19/2018] [Indexed: 01/14/2023] Open
Abstract
Hydrazone-based derivatives modified by substitution at different positions were utilized to prepare a series of bis-homoleptic cobalt complexes. One species, [CoIII(L1)2]+ (1), which incorporated deprotonated ligands, adopted a Co(iii) diamagnetic ground state. However, the substituent of a hydrogen atom with a methyl group precluded the possibility of deprotonation upon metal coordination, which led to two species, [CoII(L2Me)2]2+ (2) and [CoII(L3NO2)2]2+, (3) which underwent a gradual spin crossover with an adjustable substituent effect and a mixed character of low-spin (doublet) and high-spin (quartet) populations in wide temperature ranges. Depending on the electronic effects of the substituents on the ligand, the multielectron redox behavior of the cobalt center was systematically modulated as well. This result demonstrates redox-switchable spin crossover in a new hydrazone-based Co(ii) system, in which the deprotonation of the coordination pocket and substituent groups in aromatic ligands can have a profound effect on the redox potential and spin state of the metal center. Hydrazone-based derivatives modified by substitution at different positions were utilized to prepare a series of bis-homoleptic cobalt complexes toward multielectron redox and spin crossover.![]()
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Affiliation(s)
- Wei Huang
- Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology
- Collaborative Innovation Center of Advanced Catalysis & Green Manufacturing
- School of Petrochemical Engineering
- Changzhou University
- Changzhou
| | - Yujie Li
- Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology
- Collaborative Innovation Center of Advanced Catalysis & Green Manufacturing
- School of Petrochemical Engineering
- Changzhou University
- Changzhou
| | - Juan Yong
- Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology
- Collaborative Innovation Center of Advanced Catalysis & Green Manufacturing
- School of Petrochemical Engineering
- Changzhou University
- Changzhou
| | - Yang Liu
- Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology
- Collaborative Innovation Center of Advanced Catalysis & Green Manufacturing
- School of Petrochemical Engineering
- Changzhou University
- Changzhou
| | - Dayu Wu
- Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology
- Collaborative Innovation Center of Advanced Catalysis & Green Manufacturing
- School of Petrochemical Engineering
- Changzhou University
- Changzhou
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35
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Preparation of Co3O4 Nanoparticles via Thermal Decomposition of Three New Supramolecular Structures of Co(II) and (III) Containing 4′-Hydroxy-2,2′:6′,2′′-Terpyridine: Crystal Structures and Thermal Analysis Studies. J Inorg Organomet Polym Mater 2017. [DOI: 10.1007/s10904-017-0706-6] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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36
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Klein J, Stuckmann A, Sobottka S, Suntrup L, van der Meer M, Hommes P, Reissig HU, Sarkar B. Ruthenium Complexes with Strongly Electron-Donating Terpyridine Ligands: Effect of the Working Electrode on Electrochemical and Spectroelectrochemical Properties. Chemistry 2017; 23:12314-12325. [DOI: 10.1002/chem.201701431] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2017] [Indexed: 01/28/2023]
Affiliation(s)
- Johannes Klein
- Institut für Chemie und Biochemie; Anorganische Chemie; Freie Universität Berlin; Fabeckstraße 34-36 14195 Berlin Germany
| | - Alexandra Stuckmann
- Institut für Chemie und Biochemie; Anorganische Chemie; Freie Universität Berlin; Fabeckstraße 34-36 14195 Berlin Germany
| | - Sebastian Sobottka
- Institut für Chemie und Biochemie; Anorganische Chemie; Freie Universität Berlin; Fabeckstraße 34-36 14195 Berlin Germany
| | - Lisa Suntrup
- Institut für Chemie und Biochemie; Anorganische Chemie; Freie Universität Berlin; Fabeckstraße 34-36 14195 Berlin Germany
| | - Margarethe van der Meer
- Institut für Chemie und Biochemie; Anorganische Chemie; Freie Universität Berlin; Fabeckstraße 34-36 14195 Berlin Germany
| | - Paul Hommes
- Institut für Chemie und Biochemie; Organische Chemie; Freie Universität Berlin; Takustraße 3 14195 Berlin Germany
| | - Hans-Ulrich Reissig
- Institut für Chemie und Biochemie; Organische Chemie; Freie Universität Berlin; Takustraße 3 14195 Berlin Germany
| | - Biprajit Sarkar
- Institut für Chemie und Biochemie; Anorganische Chemie; Freie Universität Berlin; Fabeckstraße 34-36 14195 Berlin Germany
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37
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Aroua S, Todorova TK, Mougel V, Hommes P, Reissig HU, Fontecave M. New Cobalt-Bisterpyridyl Catalysts for Hydrogen Evolution Reaction. ChemCatChem 2017. [DOI: 10.1002/cctc.201700428] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Safwan Aroua
- Laboratoire de Chimie des Processus Biologiques; Collège de France; 11 Place Marcelin Berthelot 75231 Paris Cedex 05 France
| | - Tanya K. Todorova
- Laboratoire de Chimie des Processus Biologiques; Collège de France; 11 Place Marcelin Berthelot 75231 Paris Cedex 05 France
| | - Victor Mougel
- Laboratoire de Chimie des Processus Biologiques; Collège de France; 11 Place Marcelin Berthelot 75231 Paris Cedex 05 France
| | - Paul Hommes
- Institut für Chemie und Biochemie; Freie Universität Berlin; Takustrasse 3 14195 Berlin Germany
| | - Hans-Ulrich Reissig
- Institut für Chemie und Biochemie; Freie Universität Berlin; Takustrasse 3 14195 Berlin Germany
| | - Marc Fontecave
- Laboratoire de Chimie des Processus Biologiques; Collège de France; 11 Place Marcelin Berthelot 75231 Paris Cedex 05 France
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