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Roy MD, Trenerry MJ, Thakuri B, MacMillan SN, Liptak MD, Lancaster KM, Berry JF. Electronic Structure of Ru 26+ Complexes with Electron-Rich Anilinopyridinate Ligands. Inorg Chem 2022; 61:3443-3457. [PMID: 35175754 DOI: 10.1021/acs.inorgchem.1c03346] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Diruthenium paddlewheel complexes supported by electron-rich anilinopyridinate (Xap) ligands were synthesized in the course of the first in-depth structural and spectroscopic interrogation of monocationic [Ru2(Xap)4Cl]+ species in the Ru26+ oxidation state. Despite paramagnetism of the compounds, 1H NMR spectroscopy proved highly informative for determining the isomerism of the Ru25+ and Ru26+ compounds. While most compounds are found to have the polar (4,0) geometry, with all four Xap ligands in the same orientation, some synthetic procedures resulted in a mixture of (4,0) and (3,1) isomers, most notably in the case of the parent compound Ru2(ap)4Cl. The isomerism of this compound has been overlooked in previous reports. Electrochemical studies demonstrate that oxidation potentials can be tuned by the installation of electron donating groups to the ligands, increasing accessibility of the Ru26+ oxidation state. The resulting Ru26+ monocations were found to have the expected (π*)2 ground state, and an in-depth study of the electronic transitions by Vis/NIR absorption and MCD spectroscopies with the aid of TD-DFT allowed for the assignment of the electronic spectra. The empty δ* orbital is the major acceptor orbital for the most prominent electronic transitions. Both Ru25+ and Ru26+ compounds were studied by Ru K-edge X-ray absorption spectroscopy; however, the rising edge energy is insensitive to redox changes in the compounds due to the broad line shape observed for 4d transition metal K-edges. DFT calculations indicate the presence of ligand orbitals at the frontier level, suggesting that further oxidation beyond Ru26+ will be ligand-centered rather than metal-centered.
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Affiliation(s)
- Michael D Roy
- Department of Chemistry, University of Wisconsin-Madison, 1101 University Avenue, Madison, Wisconsin 53706, United States
| | - Michael J Trenerry
- Department of Chemistry, University of Wisconsin-Madison, 1101 University Avenue, Madison, Wisconsin 53706, United States
| | - Biswash Thakuri
- Department of Chemistry, University of Vermont, Burlington, Vermont 05405, United States
| | - Samantha N MacMillan
- Department of Chemistry & Chemical Biology, Baker Laboratory, Cornell University, Ithaca, New York 14853, United States
| | - Matthew D Liptak
- Department of Chemistry, University of Vermont, Burlington, Vermont 05405, United States
| | - Kyle M Lancaster
- Department of Chemistry & Chemical Biology, Baker Laboratory, Cornell University, Ithaca, New York 14853, United States
| | - John F Berry
- Department of Chemistry, University of Wisconsin-Madison, 1101 University Avenue, Madison, Wisconsin 53706, United States
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Su S, Zhu X, Wen Y, Wu X, Sheng T. Influence of Substitution Effect on MMCT in Mixed‐Valence Cyanido‐Bridged Fe
II
−CN−Ru
2
III,III
−NC−Fe
II
System. Eur J Inorg Chem 2021. [DOI: 10.1002/ejic.202100443] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Affiliation(s)
- Shao‐Dong Su
- State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences Fuzhou 350002 China
| | - Xiao‐Quan Zhu
- State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences Fuzhou 350002 China
- Department of Criminal Investigation Fujian Police College Fuzhou 350007 China
| | - Yue‐Hong Wen
- State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences Fuzhou 350002 China
| | - Xin‐Tao Wu
- State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences Fuzhou 350002 China
| | - Tian‐Lu Sheng
- State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences Fuzhou 350002 China
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Manowong M, Van Caemelbecke E, Rodríguez-Morgade MS, Bear JL, Kadish KM, Torres T. Synthesis and characterization of bis-[PcRu(CO)][Ru2(ap)4(C≡CC5H4N)2]. J PORPHYR PHTHALOCYA 2014. [DOI: 10.1142/s1088424613501228] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
A tetra-ruthenium complex containing two ruthenium(II) phthalocyanines and one metal–metal bonded diruthenium(III,III) unit was synthesized and investigated as to its electrochemical and spectroscopic properties in non-aqueous media. The title compound, represented as bis-[ PcRu ( CO )]-[ Ru 2( ap )4( C ≡ CC 5 H 4 N )2], where ap = 2-anilinopyridinate anion and Pc = the dianion of tetra-tert-butylphthalocyanine, was assembled by axial coordination of two PcRu ( CO ) macrocycles to pyridine groups of the complex which were themselves linked to the diruthenium(III,III) unit via alkyne groups. The tetra-ruthenium complex was characterized in solution and in the solid state by 1 H NMR, UV-visible and IR spectroscopies, mass spectrometry and cyclic voltammetry while thin-layer UV-visible spectroelectrochemistry was used to study the site of electron transfer. Eight redox processes occur in CH 2 Cl 2 or benzonitrile, four of which can be assigned to the macrocycles of PcRu ( CO ) and four to the central diruthenium unit of the molecule. The electrochemical and spectroscopic data suggest a weak electronic interaction between the diruthenium unit of [ Ru 2( ap )4( C ≡ CC 5 H 4 N )2] and the two externally linked Ru ( II ) phthalocyanines of the title compound.
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Affiliation(s)
- Machima Manowong
- Department of Chemistry, University of Houston, Houston, TX 77204-5003, USA
| | - Eric Van Caemelbecke
- Department of Chemistry, University of Houston, Houston, TX 77204-5003, USA
- Department of Chemistry, Houston Baptist University, Houston, TX 77074-3298, USA
| | | | - John L. Bear
- Department of Chemistry, University of Houston, Houston, TX 77204-5003, USA
| | - Karl M. Kadish
- Department of Chemistry, University of Houston, Houston, TX 77204-5003, USA
| | - Tomás Torres
- Departamento de Química Orgánica, Universidad Autónoma de Madrid, Cantoblanco, 28049 Madrid, Spain
- IMDEA-Nanociencia, c/Faraday, 9, Campus de Cantoblanco, 28049 Madrid, Spain
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Cheng F, He C, Yin H, Tang N, Hou N. Synthesis, Spectroscopic, and Electrochemical Properties of Three Tetranuclear Ruthenium(II) Polypyridyl Complexes Based on 4,5-Diazafluorene. Z Anorg Allg Chem 2013. [DOI: 10.1002/zaac.201300045] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
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Cho KJ, Ryu DW, Lim KS, Lee WR, Lee JW, Koh EK, Hong CS. Syntheses, structures, and magnetic properties of cyano- and phenoxide-bridged Fe(iii)–Mn(iii) tetrameric assemblies formed by blocked fac-Fe tricyanide with aliphatic rings. Dalton Trans 2013; 42:5796-804. [DOI: 10.1039/c3dt32563f] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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Cheng F, Chen J, Wang F, Tang N, Chen L. Synthesis, photophysical, and electrochemical properties of a new family of trinuclear Ru(II) polypyridine complexes. J COORD CHEM 2011. [DOI: 10.1080/00958972.2011.646998] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
Affiliation(s)
- Feixiang Cheng
- a College of Chemistry and Chemical Engineering, Qujing Normal University , Qujing 655011 , P.R. China
| | - Jishu Chen
- a College of Chemistry and Chemical Engineering, Qujing Normal University , Qujing 655011 , P.R. China
| | - Fan Wang
- a College of Chemistry and Chemical Engineering, Qujing Normal University , Qujing 655011 , P.R. China
| | - Ning Tang
- b College of Chemistry and Chemical Engineering and State Key Laboratory of Applied Organic Chemistry, Lanzhou University , Lanzhou 730000 , P.R. China
| | - Longhai Chen
- b College of Chemistry and Chemical Engineering and State Key Laboratory of Applied Organic Chemistry, Lanzhou University , Lanzhou 730000 , P.R. China
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Wang S, Ding XH, Zuo JL, You XZ, Huang W. Tricyanometalate molecular chemistry: A type of versatile building blocks for the construction of cyano-bridged molecular architectures. Coord Chem Rev 2011. [DOI: 10.1016/j.ccr.2011.01.057] [Citation(s) in RCA: 134] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Synthesis, photophysical, and electrochemical properties of two polynuclear ruthenium(II) polypyridyl complexes containing diazafluorene. TRANSIT METAL CHEM 2011. [DOI: 10.1007/s11243-011-9504-0] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Cheng F, Chen J, Wang F, Tang N, Chen L. “Off-on-off” Fluorescence pH Switch of Three Trinuclear RuII Complexes Containing Imidazole Rings. Z Anorg Allg Chem 2011. [DOI: 10.1002/zaac.201000450] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Kundu T, Sarkar B, Mondal TK, Mobin SM, Urbanos FA, Fiedler J, Jiménez-Aparicio R, Kaim W, Lahiri GK. Redox-rich spin-spin-coupled semiquinoneruthenium dimers with intense near-IR absorption. Inorg Chem 2011; 50:4753-63. [PMID: 21517015 DOI: 10.1021/ic102280q] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Using the [RuCl(μ-tppz)ClRu](2+) [tppz = 2,3,5,6-tetrakis(2-pyridyl)pyrazine] platform for bridging two o-quinone/catecholate two-step redox systems (unsubstituted, Q(n), or 3,5- di-tert-butyl-substituted, DTBQ(n)), we have obtained the stable complexes [(Q(•-))Ru(II)Cl(μ-tppz)ClRu(II)(Q(•-))] (1) and the structurally characterized [(DTBQ(•-))Ru(II)Cl(μ-tppz)ClRu(II)(DTBQ(•-))] (2). The compounds exhibit mostly quinone-ligand-based redox activity within a narrow potential range, high-intensity near-IR absorptions (λ(max) ≈ 920 nm; ε > 50,000 M(-1) cm(-1)), and variable intra- and intermolecular spin-spin interactions. Density functional theory calculations, electron paramagnetic resonance (EPR), and spectroelectrochemical results (UV-vis-near-IR region) for three one-electron-reduction and two one-electron-oxidation processes were used to probe the electronic structures of the systems in the various accessible valence states. EPR spectroscopy of the singly charged doublet species showed semiquinone-type response for 1(+), 2(+), and 2(-), while 1 exhibits more metal based spin, a consequence of the easier reduction of Q as compared to DTBQ. Comparison with the analogous redox series involving a more basic N-phenyliminoquinone ligand reveals significant differences related to the shifted redox potentials, different space requirements, and different interactions between the metals and the quinone-type ligands. As a result, the tppz bridge is reduced here only after full reduction of the terminal quinone ligands to their catecholate states.
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Affiliation(s)
- Tanaya Kundu
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
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Lo YH, Chen HG, Kuo TS. Proton-induced reactivities of ruthenium azido complexes: the first example of boron–carbon bond formation by methylene insertion into a B–H bond. Dalton Trans 2011; 40:2711-5. [DOI: 10.1039/c0dt01091j] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Dirhenium Compounds Supported by N,N ′-Dimethylbenzamidinate: Formation of Linear Polymers via Axial Ligation. J CLUST SCI 2010. [DOI: 10.1007/s10876-010-0284-z] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Añez E, Herrero S, Jiménez-Aparicio R, Priego JL, Torres MR, Urbanos FA. Controlling the electronic density of the [Ru2(DPhF)3(O2CR)]+ core to obtain one-dimensional compounds. Polyhedron 2010. [DOI: 10.1016/j.poly.2009.07.036] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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