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Tyulyaeva EY. Reaction chemistry of noble metal porphyrins in solutions as a foundation for practical applications. J Organomet Chem 2020. [DOI: 10.1016/j.jorganchem.2020.121484] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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2
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Tyulyaeva EY. Modern Approaches in the Synthesis of Noble Metal Porphyrins for Their Practical Application (Review). RUSS J INORG CHEM+ 2020. [DOI: 10.1134/s0036023619140110] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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3
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Demissie TB, Conradie J, Vazquez-Lima H, Ruud K, Ghosh A. Rare and Nonexistent Nitrosyls: Periodic Trends and Relativistic Effects in Ruthenium and Osmium Porphyrin-Based {MNO} 7 Complexes. ACS OMEGA 2018; 3:10513-10516. [PMID: 31459176 PMCID: PMC6645279 DOI: 10.1021/acsomega.8b01434] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/24/2018] [Accepted: 08/14/2018] [Indexed: 05/26/2023]
Abstract
Relativistic and nonrelativistic density functional theory calculations were used to investigate rare or nonexistent ruthenium and osmium analogues of nitrosylhemes. Strong ligand field effects and, to a lesser degree, relativistic effects were found to destabilize {RuNO}7 porphyrins relative to their {FeNO}7 analogues. Substantially stronger relativistic effects account for the even greater instability and/or nonexistence of {OsNO}7 porphyrin derivatives.
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Affiliation(s)
- Taye B. Demissie
- Department
of Chemistry and Hylleraas Centre for Quantum Molecular Sciences, University of Tromsø—The Arctic University
of Norway, N-9037 Tromsø, Norway
- Materials
Science Program, Department of Chemistry, Addis Ababa University, Addis
Ababa, Ethiopia
| | - Jeanet Conradie
- Department
of Chemistry and Hylleraas Centre for Quantum Molecular Sciences, University of Tromsø—The Arctic University
of Norway, N-9037 Tromsø, Norway
- Department
of Chemistry, University of the Free State, P.O. Box 339, 9300 Bloemfontein, Republic of South Africa
| | - Hugo Vazquez-Lima
- Department
of Chemistry and Hylleraas Centre for Quantum Molecular Sciences, University of Tromsø—The Arctic University
of Norway, N-9037 Tromsø, Norway
| | - Kenneth Ruud
- Department
of Chemistry and Hylleraas Centre for Quantum Molecular Sciences, University of Tromsø—The Arctic University
of Norway, N-9037 Tromsø, Norway
| | - Abhik Ghosh
- Department
of Chemistry and Hylleraas Centre for Quantum Molecular Sciences, University of Tromsø—The Arctic University
of Norway, N-9037 Tromsø, Norway
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4
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Zink JR, Abucayon EG, Ramuglia AR, Fadamin A, Eilers JE, Richter‐Addo GB, Shaw MJ. Electrochemical Investigation of the Kinetics of Chloride Substitution upon Reduction of [Ru(porphyrin)(NO)Cl] Complexes in Tetrahydrofuran. ChemElectroChem 2017. [DOI: 10.1002/celc.201701001] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Affiliation(s)
- Jeremy R. Zink
- Department of Chemistry Southern Illinois University Edwardsville Box 1652 Edwardsville, Illinois 62026 USA
- Department of Chemistry and Biochemistry University of Oklahoma 101 Stephenson Parkway Norman, Oklahoma 73019 USA
| | - Erwin G. Abucayon
- Department of Chemistry and Biochemistry University of Oklahoma 101 Stephenson Parkway Norman, Oklahoma 73019 USA
| | - Anthony R. Ramuglia
- Department of Chemistry Southern Illinois University Edwardsville Box 1652 Edwardsville, Illinois 62026 USA
| | - Arghavan Fadamin
- Department of Chemistry Southern Illinois University Edwardsville Box 1652 Edwardsville, Illinois 62026 USA
| | - James E. Eilers
- Department of Chemistry Southern Illinois University Edwardsville Box 1652 Edwardsville, Illinois 62026 USA
| | - George B. Richter‐Addo
- Department of Chemistry and Biochemistry University of Oklahoma 101 Stephenson Parkway Norman, Oklahoma 73019 USA
| | - Michael J. Shaw
- Department of Chemistry Southern Illinois University Edwardsville Box 1652 Edwardsville, Illinois 62026 USA
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5
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Awasabisah D, Xu N, Gautam KPS, Powell DR, Shaw MJ, Richter-Addo GB. Preparation, Characterization, Electrochemistry, and Infrared Spectroelectrochemistry of Ruthenium Nitrosyl Porphyrins Containingη1-O-Bonded Axial Carboxylates. Eur J Inorg Chem 2016. [DOI: 10.1002/ejic.201501115] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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6
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Xu N, Christian JH, Dalal NS, Abucayon EG, Lingafelt C, Powell DR, Richter-Addo GB. Six-coordinate ferric porphyrins containing bidentate N-t-butyl-N-nitrosohydroxylaminato ligands: structure, magnetism, IR spectroelectrochemisty, and reactivity. Dalton Trans 2015; 44:20121-30. [PMID: 26530148 DOI: 10.1039/c5dt03074a] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
NONOates (diazeniumdiolates) containing the [X{N2O2}](-) functional group are frequently employed as nitric oxide (NO) donors in biology, and some NONOates have been shown to bind to metalloenzymes. We report the preparation, crystal structures, detailed magnetic behavior, redox properties, and reactivities of the first isolable alkyl C-NONOate complexes of heme models, namely (OEP)Fe(η(2)-ON(t-Bu)NO) (1) and (TPP)Fe(η(2)-ON(t-Bu)NO) (2) (OEP = octaethylporphyrinato dianion, TPP = tetraphenylporphyrinato dianion). The compounds display the unusual NONOate O,O-bidentate binding mode for porphyrins, resulting in significant apical Fe displacements (+0.60 Å for 1, and +0.69 Å for 2) towards the axial ligands. Magnetic susceptibility and magnetization measurements made from 1.8-300 K at magnetic fields from 0.02 to 5 T, yielded magnetic moments of 5.976 and 5.974 Bohr magnetons for 1 and 2, respectively, clearly identifying them as high-spin (S = 5/2) ferric compounds. Variable-frequency (9.4 GHz and 34.5 GHz) EPR measurements, coupled with computer simulations, confirmed the magnetization results and yielded more precise values for the spin Hamiltonian parameters: g(avg) = 2.00 ± 0.03, |D| = 3.89 ± 0.09 cm(-1), and E/D = 0.07 ± 0.01 for both compounds, where D and E are the axial and rhombic zero-field splittings. IR spectroelectrochemistry studies reveal that the first oxidations of these compounds occur at the porphyrin macrocycles and not at the Fe-NONOate moieties. Reactions of 1 and 2 with a histidine mimic (1-methylimidazole) generate RNO and NO, both of which may bind to the metal center if sterics allow, as shown by a comparative study with the Cupferron complex (T(p-OMe)PP)Fe(η(2)-ON(Ph)NO). Protonation of 1 and 2 yields N2O as a gaseous product, presumably from the initial generation of HNO that dimerizes to the observed N2O product.
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Affiliation(s)
- Nan Xu
- Department of Chemistry and Biochemistry, University of Oklahoma, 101 Stephenson Parkway, Norman, OK 73019, USA. and Division of Mathematics and Natural Sciences, Penn State Altoona, 3000 Ivyside Park, Altoona, PA 16601, USA.
| | - Jonathan H Christian
- Department of Chemistry and Biochemistry, Florida State University, 95 Chieftan Way, Tallahassee, FL 32306, USA.
| | - Naresh S Dalal
- Department of Chemistry and Biochemistry, Florida State University, 95 Chieftan Way, Tallahassee, FL 32306, USA.
| | - Erwin G Abucayon
- Department of Chemistry and Biochemistry, University of Oklahoma, 101 Stephenson Parkway, Norman, OK 73019, USA.
| | - Colin Lingafelt
- Division of Mathematics and Natural Sciences, Penn State Altoona, 3000 Ivyside Park, Altoona, PA 16601, USA.
| | - Douglas R Powell
- Department of Chemistry and Biochemistry, University of Oklahoma, 101 Stephenson Parkway, Norman, OK 73019, USA.
| | - George B Richter-Addo
- Department of Chemistry and Biochemistry, University of Oklahoma, 101 Stephenson Parkway, Norman, OK 73019, USA.
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7
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Kaim W. Complete and Partial Electron Transfer Involving Coordinated NOx. ADVANCES IN INORGANIC CHEMISTRY 2015. [DOI: 10.1016/bs.adioch.2014.10.007] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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8
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Bari SE, Olabe JA, Slep LD. Three Redox States of Metallonitrosyls in Aqueous Solution. ADVANCES IN INORGANIC CHEMISTRY 2015. [DOI: 10.1016/bs.adioch.2014.10.001] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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9
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Zhang MJ, Lv JY, Pan QJ, Guo YR. Electronic, photophysical and redox properties of tetrapyrrolic ruthenium(II) isothiocyanato complexes and their carboxylic anchors’ effect: an implication for dye-sensitized solar cells. Theor Chem Acc 2014. [DOI: 10.1007/s00214-014-1582-6] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Xu N, Powell DR, Richter-Addo GB. Synthesis, molecular structure, and spectroelectrochemistry of a nitrosyl iron porphyrin containing an unsymmetrical xanthene-linked porphyrin core. Nitric Oxide 2014; 37:61-5. [PMID: 24447916 DOI: 10.1016/j.niox.2014.01.001] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2013] [Revised: 12/05/2013] [Accepted: 01/09/2014] [Indexed: 11/19/2022]
Abstract
Synthetic nitrosyl porphyrins with meso-aryl substituents are potential models for the biologically-important NO-bound P460 heme cofactor. A five-coordinate iron nitrosyl tetraaryl-porphyrin (HTPPX-CO2H)Fe(NO) containing a xanthene-based meso substituent has been prepared. The crystal structure of this formally {FeNO}7 complex reveals an ordered axial and bent NO ligand (∠FeNO=142.5(6)Å) displaying an off-axis tilt of the nitrosyl N atom from the heme normal by 9.2°. Surprisingly, the porphyrin core does not display the expected asymmetry in FeN(por) distances frequently observed in iron nitrosyl porphyrins. The redox behavior as determined by cyclic voltammetry reveals, in contrast to most (por)Fe(NO) compounds, a fast NO dissociation after electrooxidation in CH2Cl2 to result in a net chemically-irreversible oxidation at Epa=+0.77V vs Ag/AgCl. IR spectroelectrochemistry reveals a recombination, on the spectroelectrochemistry time-scale, of the dissociated NO on oxidation with electrogenerated [(HTPPX-CO2H)Fe]+.
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Affiliation(s)
- Nan Xu
- Department of Chemistry and Biochemistry, University of Oklahoma, 101 Stephenson Parkway, Norman, OK 73019, USA
| | - Douglas R Powell
- Department of Chemistry and Biochemistry, University of Oklahoma, 101 Stephenson Parkway, Norman, OK 73019, USA
| | - George B Richter-Addo
- Department of Chemistry and Biochemistry, University of Oklahoma, 101 Stephenson Parkway, Norman, OK 73019, USA.
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11
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Awasabisah D, Xu N, Sharmah Gautam KP, Powell DR, Shaw MJ, Richter-Addo GB. Stable ruthenium nitrosyl porphyrins with axial O-bonded ligands; preparation and redox behavior. Dalton Trans 2013; 42:8537-40. [DOI: 10.1039/c3dt33109a] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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12
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El-Attar MA, Xu N, Awasabisah D, Powell DR, Richter-Addo GB. Cyclic voltammetric and fiber-optic infrared spectroelectrochemical studies of six-coordinate (por)Ru(NO)Cl compounds (por=porphyrinato dianion). Polyhedron 2012. [DOI: 10.1016/j.poly.2012.03.034] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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13
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Xu N, Lilly J, Powell DR, Richter-Addo GB. Synthesis, Characterization, and Infrared Reflectance Spectroelectrochemistry of Organoruthenium Nitrosyl Porphyrins. Organometallics 2012. [DOI: 10.1021/om200601g] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Nan Xu
- Department of Chemistry
and Biochemistry, University of Oklahoma, 101 Stephenson Parkway, Norman, Oklahoma 73019, United States
| | - John Lilly
- Department of Chemistry
and Biochemistry, University of Oklahoma, 101 Stephenson Parkway, Norman, Oklahoma 73019, United States
| | - Douglas R. Powell
- Department of Chemistry
and Biochemistry, University of Oklahoma, 101 Stephenson Parkway, Norman, Oklahoma 73019, United States
| | - George B. Richter-Addo
- Department of Chemistry
and Biochemistry, University of Oklahoma, 101 Stephenson Parkway, Norman, Oklahoma 73019, United States
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14
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Pellegrino J, Hübner R, Doctorovich F, Kaim W. Spectroelectrochemical Evidence for the Nitrosyl Redox Siblings NO
+
, NO
.
, and NO
−
Coordinated to a Strongly Electron‐Accepting Fe
II
Porphyrin: DFT Calculations Suggest the Presence of High‐Spin States after Reduction of the Fe
II
–NO
−
Complex. Chemistry 2011; 17:7868-74. [DOI: 10.1002/chem.201003516] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2010] [Indexed: 10/18/2022]
Affiliation(s)
- Juan Pellegrino
- Departamento de Química Inorgánica, Analítica, y Química Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires. INQUIMAE‐CONICET, Ciudad Universitaria, Pab. 2, C1428EHA Buenos Aires (Argentina), Fax: +54 11 4576‐3341
| | - Ralph Hübner
- Institut für Anorganische Chemie, Universität Stuttgart, Pfaffenwaldring 55, 70550 Stuttgart (Germany), Fax: (+49) 711 685 64165
| | - Fabio Doctorovich
- Departamento de Química Inorgánica, Analítica, y Química Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires. INQUIMAE‐CONICET, Ciudad Universitaria, Pab. 2, C1428EHA Buenos Aires (Argentina), Fax: +54 11 4576‐3341
| | - Wolfgang Kaim
- Institut für Anorganische Chemie, Universität Stuttgart, Pfaffenwaldring 55, 70550 Stuttgart (Germany), Fax: (+49) 711 685 64165
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Shaw MJ, Cranford DL, Rodgers KW, Eilers JE, Noble B, Warhausen AJ, Richter-Addo GB. Facile Determination of the Spectra of Unstable Electrode Products Using Simultaneous Fiber-Optic Chronoabsorptometry and Chronoamperometry. Inorg Chem 2010; 49:9590-8. [DOI: 10.1021/ic1012654] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Michael J. Shaw
- Department of Chemistry, Box 1652, Southern Illinois University at Edwardsville, Edwardsville, Illinois 62026
| | - Daniel L. Cranford
- Department of Chemistry, Box 1652, Southern Illinois University at Edwardsville, Edwardsville, Illinois 62026
| | - Kenneth W. Rodgers
- Department of Chemistry, Box 1652, Southern Illinois University at Edwardsville, Edwardsville, Illinois 62026
| | - James E. Eilers
- Department of Chemistry, Box 1652, Southern Illinois University at Edwardsville, Edwardsville, Illinois 62026
| | - Bradley Noble
- Department of Electrical and Computer Engineering, Box 1801, Southern Illinois University at Edwardsville, Edwardsville, Illinois 62026
| | - Adam J. Warhausen
- Department of Chemistry and Biochemistry, University of Oklahoma, 620 Parrington Oval, Norman, Oklahoma 73019
| | - George B. Richter-Addo
- Department of Chemistry and Biochemistry, University of Oklahoma, 620 Parrington Oval, Norman, Oklahoma 73019
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16
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Loew N, Wollenberger U, Scheller FW, Katterle M. Direct electrochemistry and spectroelectrochemistry of osmium substituted horseradish peroxidase. Bioelectrochemistry 2009; 76:28-33. [PMID: 19411193 DOI: 10.1016/j.bioelechem.2009.03.015] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2009] [Revised: 03/18/2009] [Accepted: 03/31/2009] [Indexed: 10/20/2022]
Abstract
In this contribution the substitution of the central protoporphyrin IX iron complex of horseradish peroxidase by the respective osmium porphyrin complex is described. The direct electrochemical reduction of the Os containing horseradish peroxidase (OsHRP) was achieved at ITO and modified glassy carbon electrodes and in combination with spectroscopy revealed the three redox couples Os(III)HRP/Os(IV)HRP, Os(IV)HRP/Os(V)HRP and Os(V)HRP/Os(VI)HRP. The midpoint potentials differ dependent on the electrode material used with E(1/2) (Os(III/IV)) of -0.4 V (ITO) and -0.25 V (GC), E(1/2) (Os(IV)/(V)) of -0.16 V (ITO) and +0.10 V (GC), and E(1/2) (Os(V/VI))of +0.18 V (ITO), respectively. Moreover, with immobilised OsHRP the direct electrocatalytic reduction of hydrogen peroxide and tert-butyl hydroperoxide was observed. In comparison to electrodes modified with native HRP the sensitivity of the OsHRP-electrode for tert-butyl hydroperoxide is higher.
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Affiliation(s)
- Noya Loew
- Department of Analytical Biochemistry, Institute of Biochemistry and Biology, University of Potsdam, Karl-Liebknecht-Strasse 24-25, 14476 Potsdam, Germany
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17
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Singh P, Das AK, Sarkar B, Niemeyer M, Roncaroli F, Olabe JA, Fiedler J, Záliš S, Kaim W. Redox Properties of Ruthenium Nitrosyl Porphyrin Complexes with Different Axial Ligation: Structural, Spectroelectrochemical (IR, UV−Visible, and EPR), and Theoretical Studies. Inorg Chem 2008; 47:7106-13. [DOI: 10.1021/ic702371t] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Affiliation(s)
- Priti Singh
- Institut für Anorganische Chemie, Universität Stuttgart, Pfaffenwaldring 55, D-70550 Stuttgart, Germany, Departamento de Química Inorgánica, Analítica y Química Física and INQUIMAE, Facultad de Ciencias Exactas y Naturales, UBA, Pabellón 2, Ciudad Universitaria, C1428EHA Buenos Aires, Republic of Argentina, and J. Heyrovský Institute of Physical Chemistry, v.v.i., Academy of Sciences of the Czech Republic, Dolejškova 3, CZ-18223 Prague, Czech Republic
| | - Atanu Kumar Das
- Institut für Anorganische Chemie, Universität Stuttgart, Pfaffenwaldring 55, D-70550 Stuttgart, Germany, Departamento de Química Inorgánica, Analítica y Química Física and INQUIMAE, Facultad de Ciencias Exactas y Naturales, UBA, Pabellón 2, Ciudad Universitaria, C1428EHA Buenos Aires, Republic of Argentina, and J. Heyrovský Institute of Physical Chemistry, v.v.i., Academy of Sciences of the Czech Republic, Dolejškova 3, CZ-18223 Prague, Czech Republic
| | - Biprajit Sarkar
- Institut für Anorganische Chemie, Universität Stuttgart, Pfaffenwaldring 55, D-70550 Stuttgart, Germany, Departamento de Química Inorgánica, Analítica y Química Física and INQUIMAE, Facultad de Ciencias Exactas y Naturales, UBA, Pabellón 2, Ciudad Universitaria, C1428EHA Buenos Aires, Republic of Argentina, and J. Heyrovský Institute of Physical Chemistry, v.v.i., Academy of Sciences of the Czech Republic, Dolejškova 3, CZ-18223 Prague, Czech Republic
| | - Mark Niemeyer
- Institut für Anorganische Chemie, Universität Stuttgart, Pfaffenwaldring 55, D-70550 Stuttgart, Germany, Departamento de Química Inorgánica, Analítica y Química Física and INQUIMAE, Facultad de Ciencias Exactas y Naturales, UBA, Pabellón 2, Ciudad Universitaria, C1428EHA Buenos Aires, Republic of Argentina, and J. Heyrovský Institute of Physical Chemistry, v.v.i., Academy of Sciences of the Czech Republic, Dolejškova 3, CZ-18223 Prague, Czech Republic
| | - Federico Roncaroli
- Institut für Anorganische Chemie, Universität Stuttgart, Pfaffenwaldring 55, D-70550 Stuttgart, Germany, Departamento de Química Inorgánica, Analítica y Química Física and INQUIMAE, Facultad de Ciencias Exactas y Naturales, UBA, Pabellón 2, Ciudad Universitaria, C1428EHA Buenos Aires, Republic of Argentina, and J. Heyrovský Institute of Physical Chemistry, v.v.i., Academy of Sciences of the Czech Republic, Dolejškova 3, CZ-18223 Prague, Czech Republic
| | - José A. Olabe
- Institut für Anorganische Chemie, Universität Stuttgart, Pfaffenwaldring 55, D-70550 Stuttgart, Germany, Departamento de Química Inorgánica, Analítica y Química Física and INQUIMAE, Facultad de Ciencias Exactas y Naturales, UBA, Pabellón 2, Ciudad Universitaria, C1428EHA Buenos Aires, Republic of Argentina, and J. Heyrovský Institute of Physical Chemistry, v.v.i., Academy of Sciences of the Czech Republic, Dolejškova 3, CZ-18223 Prague, Czech Republic
| | - Jan Fiedler
- Institut für Anorganische Chemie, Universität Stuttgart, Pfaffenwaldring 55, D-70550 Stuttgart, Germany, Departamento de Química Inorgánica, Analítica y Química Física and INQUIMAE, Facultad de Ciencias Exactas y Naturales, UBA, Pabellón 2, Ciudad Universitaria, C1428EHA Buenos Aires, Republic of Argentina, and J. Heyrovský Institute of Physical Chemistry, v.v.i., Academy of Sciences of the Czech Republic, Dolejškova 3, CZ-18223 Prague, Czech Republic
| | - Stanislav Záliš
- Institut für Anorganische Chemie, Universität Stuttgart, Pfaffenwaldring 55, D-70550 Stuttgart, Germany, Departamento de Química Inorgánica, Analítica y Química Física and INQUIMAE, Facultad de Ciencias Exactas y Naturales, UBA, Pabellón 2, Ciudad Universitaria, C1428EHA Buenos Aires, Republic of Argentina, and J. Heyrovský Institute of Physical Chemistry, v.v.i., Academy of Sciences of the Czech Republic, Dolejškova 3, CZ-18223 Prague, Czech Republic
| | - Wolfgang Kaim
- Institut für Anorganische Chemie, Universität Stuttgart, Pfaffenwaldring 55, D-70550 Stuttgart, Germany, Departamento de Química Inorgánica, Analítica y Química Física and INQUIMAE, Facultad de Ciencias Exactas y Naturales, UBA, Pabellón 2, Ciudad Universitaria, C1428EHA Buenos Aires, Republic of Argentina, and J. Heyrovský Institute of Physical Chemistry, v.v.i., Academy of Sciences of the Czech Republic, Dolejškova 3, CZ-18223 Prague, Czech Republic
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18
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Nagao H, Enomoto K, Wakabayashi Y, Komiya G, Hirano T, Oi T. Synthesis of Nitrosylruthenium Complexes Containing 2,2‘:6‘,2‘ ‘-Terpyridine by Reactions of Alkoxo Complexes with Acids. Inorg Chem 2007; 46:1431-9. [PMID: 17291127 DOI: 10.1021/ic061644w] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Nitrosylruthenium complexes containing 2,2':6',2"-terpyridine (terpy) have been synthesized and characterized. The three alkoxo complexes trans-(NO, OCH3), cis-(Cl, OCH3)-[RuCl(OCH3)(NO)(terpy)]PF6 ([2]PF6), trans-(NO, OC2H5), cis-(Cl, OC2H5)-[RuCl(OC2H5)(NO)(terpy)]PF6 ([3]PF6), and [RuCl(OC3H7)(NO)(terpy)]PF6 ([4]PF6) were synthesized by reactions of trans-(Cl, Cl), cis-(NO, Cl)-[RuCl2(NO)(terpy)]PF6 ([1]PF6) with NaOCH3 in CH3OH, C2H5OH, and C3H7OH, respectively. Reactions of [3]PF6 with an acid such as hydrochloric acid and trifluoromethansulforic acid afford nitrosyl complexes in which the alkoxo ligand is substituted. The geometrical isomer of [1]PF6, trans-(NO, Cl), cis-(Cl, Cl)-[RuCl2(NO)(terpy)]PF6 ([5]PF6), was obtained by the reaction of [3]PF6 in a hydrochloric acid solution. Reaction of [3]PF6 with trifluoromethansulforic acid in CH3CN gave trans-(NO, Cl), cis-(CH3CN, Cl)-[RuCl(CH3CN)(NO)(terpy)]2+ ([6]2+) under refluxing conditions. The structures of [3]PF6, [4]PF6.CH3CN, [5]CF3SO3, and [6](PF6)2 were determined by X-ray crystallograpy.
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Affiliation(s)
- Hirotaka Nagao
- Department of Chemistry, Faculty of Science and Technology, Sophia University, 7-1 Kioi-cho, Chiyoda-ku, Tokyo 102-8554, Japan.
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Singh P, Sarkar B, Sieger M, Niemeyer M, Fiedler J, Zális S, Kaim W. The Metal−NO Interaction in the Redox Systems [Cl5Os(NO)]n-, n = 1−3, and cis-[(bpy)2ClOs(NO)]2+/+: Calculations, Structural, Electrochemical, and Spectroscopic Results. Inorg Chem 2006; 45:4602-9. [PMID: 16749822 DOI: 10.1021/ic0517669] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Experimental and computational results for the two-step redox system [Cl5Os(NO)]n- (n = 1-3) are reported and discussed in comparison to the related one-step redox systems [Cl5Ru(NO)]n- and [Cl5Ir(NO)]n- (n = 1, 2). The osmium system exhibits remarkably low oxidation and reduction potentials. The structure of the precursor (PPh4)2[Cl5Os(NO)] is established as an {MNO}6 species with almost linear OsNO arrangement at 178.1 degrees. Density-functional theory (DFT) calculations confirm this result, and a comparison of structures calculated for several oxidation states reveals an increased labilization of the trans-positioned M-Cl bond on reduction in the order M = Ir < Os < Ru. Accordingly, the intact reduced form [Cl5Os(NO)]3- could not be observed in fluid solution even on electrolysis at -70 degrees C in n-butyronitrile solution, as confirmed both by DFT calculations and by comparison with the electron paramagnetic resonance and infrared spectroelectrochemically characterized redox pairs cis-[(bpy)2ClOs(NO)]2+/+ and [(CN)5Os(NO)]2-/3-. The DFT calculations indicate that the oxidation of [Cl5Os(NO)]2- occurs largely on the metal, the highest occupied molecular orbital (HOMO) of the precursor being composed of Os 5d (58%) and Cl(eq) 3p orbitals (41%). As for the related [(CN)5Os(NO)]2-, the reduction is largely NO centered, the lowest unoccupied molecular orbital (LUMO) of [Cl5Os(NO)]2- has 61% pi*(NO) character with significant 5d Os contributions (34%). A rather large degree of metal-NO back-donation is estimated to occur in the {OsNO}7 configuration of [Cl5Os(NO)]3- which leads to an unusual low value of 1513 cm(-1) calculated for nu(NO), signifying contributions from an Os(III)(NO-) formulation. Detailed analyses of the conformational dependence of the g anisotropy suggest that the different reduced species reported previously for [Cl5Os(NO)]3- in AgCl host lattices may be distinct in terms of eclipsed or staggered conformations of the bent NO. axial ligand relative to the Os(II)Cl4 equatorial plane. The staggered form is calculated to be more stable by 105 cm(-1). The weak absorptions of [Cl5Os(NO)]2- at 573, 495, and 437 nm are assigned as MLCT/LLCT transitions to the doubly degenerate pi*(NO) LUMO. The oxidized form [Cl5Os(NO)]- contains Os(III) in an {OsNO}5 configuration with a spin density of 0.711 on Os. In all three states of [Cl5Os(NO)]n-, the N bonded form is vastly preferred over the NO-side-on bonded alternative.
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Affiliation(s)
- Priti Singh
- Institut für Anorganische Chemie, Universität Stuttgart, Pfaffenwaldring 55, D-70550 Stuttgart, Germany
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