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Meitinger N, Mandal S, Sorsche D, Pannwitz A, Rau S. Red Light Absorption of [Re I(CO) 3(α-diimine)Cl] Complexes through Extension of the 4,4'-Bipyrimidine Ligand's π-System. Molecules 2023; 28:molecules28041905. [PMID: 36838893 PMCID: PMC9964139 DOI: 10.3390/molecules28041905] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2022] [Revised: 02/06/2023] [Accepted: 02/08/2023] [Indexed: 02/19/2023] Open
Abstract
Rhenium(I) complexes of type [Re(CO)3(NN)Cl] (NN = α-diimine) with MLCT absorption in the orange-red region of the visible spectrum have been synthesized and fully characterized, including single crystal X-ray diffraction on two complexes. The strong bathochromic shift of MLCT absorption was achieved through extension of the π-system of the electron-poor bidiazine ligand 4,4'-bipyrimidine by the addition of fused phenyl rings, resulting in 4,4'-biquinazoline. Furthermore, upon anionic cyclization of the twisted bidiazine, a new 4N-doped perylene ligand, namely, 1,3,10,12-tetraazaperylene, was obtained. Electrochemical characterization revealed a significant stabilization of the LUMO in this series, with the first reduction of the azaperylene found at E1/2(0/-) = -1.131 V vs. Fc+/Fc, which is the most anodic half-wave potential observed for N-doped perylene derivatives so far. The low LUMO energies were directly correlated to the photophysical properties of the respective complexes, resulting in a strongly red-shifted MLCT absorption band in chloroform with a λmax = 586 nm and high extinction coefficients (ε586nm > 5000 M-1 cm-1) ranging above 700 nm in the case of the tetraazaperylene complex. Such low-energy MLCT absorption is highly unusual for Re(I) α-diimine complexes, for which these bands are typically found in the near UV. The reported 1,3,10,12-tetraazaperylene complex displayed the [Re(CO)3(α-diimine)Cl] complex with the strongest MLCT red shift ever reported. UV-Vis NIR spectroelectrochemical investigations gave further insights into the nature and stability of the reduced states. The electron-poor ligands explored herein open up a new path for designing metal complexes with strongly red-shifted absorption, thus enabling photocatalysis and photomedical applications with low-energy, tissue-penetrating red light in future.
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Wang J, Hao W, Ma LJ, Jia J, Wu HS. The effect of interstitial boron on the mechanisms of acetylene hydrogenation catalyzed by Pd6: A DFT study. COMPUT THEOR CHEM 2019. [DOI: 10.1016/j.comptc.2019.112636] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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3
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Abate PO, Pourrieux G, Morán Vieyra FE, Cattaneo M, Vergara MM, Katz NE. A new molecular switch based on a symmetrical dinuclear complex of two tricarbonylrhenium(I) moieties bridged by 4,4″-azobis-(2,2′-bipyridine). Polyhedron 2018. [DOI: 10.1016/j.poly.2018.04.029] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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Barnsley JE, Scottwell SØ, Elliott ABS, Gordon KC, Crowley JD. Structural, Electronic, and Computational Studies of Heteroleptic Cu(I) Complexes of 6,6′-Dimesityl-2,2′-bipyridine with Ferrocene-Appended Ethynyl-2,2′-bipyridine Ligands. Inorg Chem 2016; 55:8184-92. [DOI: 10.1021/acs.inorgchem.6b01300] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Jonathan E. Barnsley
- Department of Chemistry, University of Otago, P.O. Box 56, Dunedin 9016, New Zealand
| | - Synøve Ø. Scottwell
- Department of Chemistry, University of Otago, P.O. Box 56, Dunedin 9016, New Zealand
| | | | - Keith C. Gordon
- Department of Chemistry, University of Otago, P.O. Box 56, Dunedin 9016, New Zealand
| | - James D. Crowley
- Department of Chemistry, University of Otago, P.O. Box 56, Dunedin 9016, New Zealand
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Larsen CB, van der Salm H, Clark CA, Elliott ABS, Fraser MG, Horvath R, Lucas NT, Sun XZ, George MW, Gordon KC. Intraligand Charge-Transfer Excited States in Re(I) Complexes with Donor-Substituted Dipyridophenazine Ligands. Inorg Chem 2014; 53:1339-54. [DOI: 10.1021/ic402082m] [Citation(s) in RCA: 54] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Affiliation(s)
- Christopher B. Larsen
- MacDiarmid
Institute for Advanced Materials and Nanotechnology, Department of
Chemistry, University of Otago, Union Place, Dunedin 9001, New Zealand
| | - Holly van der Salm
- MacDiarmid
Institute for Advanced Materials and Nanotechnology, Department of
Chemistry, University of Otago, Union Place, Dunedin 9001, New Zealand
| | - Charlotte A. Clark
- School
of Chemistry, University of Nottingham, University Park, Nottingham NG7 2RD, United Kingdom
| | - Anastasia B. S. Elliott
- MacDiarmid
Institute for Advanced Materials and Nanotechnology, Department of
Chemistry, University of Otago, Union Place, Dunedin 9001, New Zealand
| | - Michael G. Fraser
- MacDiarmid
Institute for Advanced Materials and Nanotechnology, Department of
Chemistry, University of Otago, Union Place, Dunedin 9001, New Zealand
| | - Raphael Horvath
- School
of Chemistry, University of Nottingham, University Park, Nottingham NG7 2RD, United Kingdom
| | - Nigel T. Lucas
- MacDiarmid
Institute for Advanced Materials and Nanotechnology, Department of
Chemistry, University of Otago, Union Place, Dunedin 9001, New Zealand
| | - Xue-Zhong Sun
- School
of Chemistry, University of Nottingham, University Park, Nottingham NG7 2RD, United Kingdom
| | - Michael W. George
- School
of Chemistry, University of Nottingham, University Park, Nottingham NG7 2RD, United Kingdom
| | - Keith C. Gordon
- MacDiarmid
Institute for Advanced Materials and Nanotechnology, Department of
Chemistry, University of Otago, Union Place, Dunedin 9001, New Zealand
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Anderson CB, Elliott ABS, Lewis JEM, McAdam CJ, Gordon KC, Crowley JD. fac-Re(CO)3 complexes of 2,6-bis(4-substituted-1,2,3-triazol-1-ylmethyl)pyridine "click" ligands: synthesis, characterisation and photophysical properties. Dalton Trans 2013; 41:14625-32. [PMID: 23104300 DOI: 10.1039/c2dt31569f] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
The syntheses of the 4-n-propyl and 4-phenyl substituted fac-Re(CO)(3) complexes of the tridentate "click" ligand (2,6-bis(4-substituted-1,2,3-triazol-1-ylmethyl)pyridine) are described. The complexes were obtained by refluxing methanol solutions of [Re(CO)(5)Cl], AgPF(6) and either the 4-propyl or 4-phenyl substituted ligand for 16 h. The ligands and the two rhenium(I) complexes were characterised by elemental analysis, HR-ESMS, ATR-IR, (1)H and (13)C NMR spectroscopy and the molecular structures of both complexes were confirmed by X-ray crystallography. The electronic structure of the fac-Re(CO)(3) "click" complexes was probed using UV-Vis, Raman and emission spectroscopy, cyclic voltammetry and DFT calculations. Altering the electronic nature of the ligand's substituent, from aromatic to alkyl, had little effect on the absorption/emission maxima and electrochemical properties of the complexes indicating that the 1,2,3-triazole unit may insulate the metal centre from the electronic modification at the ligands' periphery. Both Re(I) complexes were found to be weakly emitting with short excited state lifetimes. The electrochemistry of the complexes is defined by quasi-reversible Re oxidation and irreversible triazole-based ligand reduction processes.
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7
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Fraser MG, van der Salm H, Cameron SA, Blackman AG, Gordon KC. Heteroleptic Cu(I) bis-diimine complexes of 6,6'-dimesityl-2,2'-bipyridine: a structural, theoretical and spectroscopic study. Inorg Chem 2013; 52:2980-92. [PMID: 23458499 DOI: 10.1021/ic302393p] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
A series of heteroleptic Cu(I) complexes containing 6,6'-dimesityl-2,2'-bipyridine and phenanthroline-, bipyridine-, and biquinoline-based ligands is studied. The HETPHEN strategy is utilized to synthesize the heteroleptic complexes, which are stable in solution. The X-ray crystal structures of the complexes are presented; the solid-state four-coordinate Cu(I) geometries are quantified by using the τ4 parameter. A feature of the crystal structures is the intramolecular π-stacking between the mesityl ring(s) and the diimine ligand; the phen-based complexes exhibit stacking between the phen ligand and one of the mesityl rings, creating a "Pac-Man" motif. On the other hand, the bpy-based complexes show different types of packing interaction, with both mesityl rings "clamping down" on the bpy based ligand to give π-stacking. Cyclic voltammetry is used to examine the redox chemistry of the complexes. The most positive potentials for the oxidation process are observed for the complexes with bulky substituents ortho to the coordination nitrogens atoms, i.e., 2,9-dimethyl-1,10-phenanthroline and 6,6'-dibromo-2,2'-bipyridine. The Cu(I) MLCT transitions of the complexes are investigated by resonance Raman spectroscopy in concert with TD-DFT calculations. The resonance Raman spectra of complexes containing substituted biquinolines are straightforward, in that vibrational bands of the biquinoline-based ligand are selectively enhanced over bpy(Mes)2 bands. This is consistent with the purple color of the complexes, due to the lower energy of the biquinoline-based LUMO compared to the bpy(Mes)2 LUMO. All the phen- and bpy-based complexes show enhancement of bpy(Mes)2 bands.
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Affiliation(s)
- Michael G Fraser
- MacDiarmid Institute for Advanced Materials and Nanotechnology, Department of Chemistry, University of Otago, Dunedin, New Zealand
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8
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Structural, electronic and computational studies of heteroleptic Cu(I) complexes of 6,6′-dimesityl-2,2′-bipyridine with sulfur-substituted dipyridophenazine ligands. Polyhedron 2013. [DOI: 10.1016/j.poly.2012.08.001] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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9
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Rhenium(I) complexes of readily functionalized bidentate pyridyl-1,2,3-triazole “click” ligands: A systematic synthetic, spectroscopic and computational study. Polyhedron 2013. [DOI: 10.1016/j.poly.2012.05.003] [Citation(s) in RCA: 62] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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10
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Horvath R, Lombard J, Leprêtre JC, Collomb MN, Deronzier A, Chauvin J, Gordon KC. Excited-state spectroscopic investigations of multinuclear complexes based on [Ru(bpy)3]2+ moieties connected to 2,2′-bipyridine and 2,2′;6′,2′′-terpyridine ligands. Dalton Trans 2013; 42:16527-37. [DOI: 10.1039/c3dt52153b] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
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11
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Ren Y, Jia J, Liu W, Wu HS. Theoretical Study on the Mechanism of Palladium-Catalyzed Dearomatization Reaction of Chloromethylnaphthalene. Organometallics 2012. [DOI: 10.1021/om300797n] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Affiliation(s)
- Ying Ren
- School of Chemistry and Materials
Science, Shanxi Normal University, Linfen,
041004, People’
Republic of China
| | - Jianfeng Jia
- School of Chemistry and Materials
Science, Shanxi Normal University, Linfen,
041004, People’
Republic of China
| | - Wenxian Liu
- School of Chemistry and Materials
Science, Shanxi Normal University, Linfen,
041004, People’
Republic of China
| | - Hai-Shun Wu
- School of Chemistry and Materials
Science, Shanxi Normal University, Linfen,
041004, People’
Republic of China
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12
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Horvath R, Gordon KC. Understanding excited-state structure in metal polypyridyl complexes using resonance Raman excitation profiles, time-resolved resonance Raman spectroscopy and density functional theory. Coord Chem Rev 2010. [DOI: 10.1016/j.ccr.2009.11.015] [Citation(s) in RCA: 59] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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13
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Zhang TT, Jia JF, Wu HS. Substituent and Solvent Effects on Electronic Structure and Spectral Property of ReCl(CO)3(N∧N) (N∧N = Glyoxime): DFT and TDDFT Theoretical Studies. J Phys Chem A 2010; 114:12251-7. [DOI: 10.1021/jp104458u] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Ting-Ting Zhang
- School of Chemistry and Materials Science, Shanxi Normal University, Linfen, 041004, China
| | - Jian-Feng Jia
- School of Chemistry and Materials Science, Shanxi Normal University, Linfen, 041004, China
| | - Hai-Shun Wu
- School of Chemistry and Materials Science, Shanxi Normal University, Linfen, 041004, China
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14
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Horvath R, Otter CA, Gordon KC, Brodie AM, Ainscough EW. Excited States of Ru(II) and Re(I) Bipyridyl Complexes Attached to Cyclotriphosphazenes: A Synthetic, Spectroscopic, and Computational Study. Inorg Chem 2010; 49:4073-83. [DOI: 10.1021/ic902171j] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Raphael Horvath
- MacDiarmid Institute for Advanced Materials and Nanotechnology, Department of Chemistry, University of Otago, Dunedin, New Zealand
| | - Carl A. Otter
- Chemistry-Institute of Fundamental Sciences, Massey University, Palmerston North, New Zealand
| | - Keith C. Gordon
- MacDiarmid Institute for Advanced Materials and Nanotechnology, Department of Chemistry, University of Otago, Dunedin, New Zealand
| | - Andrew M. Brodie
- Chemistry-Institute of Fundamental Sciences, Massey University, Palmerston North, New Zealand
| | - Eric W. Ainscough
- Chemistry-Institute of Fundamental Sciences, Massey University, Palmerston North, New Zealand
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15
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Guo CH, Song JY, Jia JF, Zhang XM, Wu HS. A DFT Study on the Mechanism of the Coupling Reaction between Chloromethyloxirane and Carbon Dioxide Catalyzed by Re(CO)5Br. Organometallics 2010. [DOI: 10.1021/om100020s] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Cai-Hong Guo
- School of Chemistry and Materials Science, Shanxi Normal University, Linfen 041004, People's Republic of China
- Chemical Engineering Department, Taiyuan University of Technology, Taiyuan 030024, People's Republic of China
| | - Jiang-Yu Song
- School of Chemistry and Materials Science, Shanxi Normal University, Linfen 041004, People's Republic of China
| | - Jian-Feng Jia
- School of Chemistry and Materials Science, Shanxi Normal University, Linfen 041004, People's Republic of China
| | - Xian-Ming Zhang
- School of Chemistry and Materials Science, Shanxi Normal University, Linfen 041004, People's Republic of China
| | - Hai-Shun Wu
- School of Chemistry and Materials Science, Shanxi Normal University, Linfen 041004, People's Republic of China
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16
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Lind SJ, Walsh TJ, Blackman AG, Polson MIJ, Irwin GIS, Gordon KC. Trinuclear Copper(I) Complex Containing 3,4,9,10,15,16-Hexamethyl-1,6,7,12,13,18-hexaazatrinaphthylene: A Structural, Spectroscopic, and Computational Study. J Phys Chem A 2009; 113:3566-75. [DOI: 10.1021/jp808179m] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Affiliation(s)
- Samuel J. Lind
- MacDiarmid Institute for Advanced Materials and Nanotechnology, Department of Chemistry, University of Otago, Dunedin, New Zealand
| | - Timothy J. Walsh
- MacDiarmid Institute for Advanced Materials and Nanotechnology, Department of Chemistry, University of Otago, Dunedin, New Zealand
| | - Allan G. Blackman
- MacDiarmid Institute for Advanced Materials and Nanotechnology, Department of Chemistry, University of Otago, Dunedin, New Zealand
| | - Matthew I. J. Polson
- MacDiarmid Institute for Advanced Materials and Nanotechnology, Department of Chemistry, University of Otago, Dunedin, New Zealand
| | - Garth I. S. Irwin
- MacDiarmid Institute for Advanced Materials and Nanotechnology, Department of Chemistry, University of Otago, Dunedin, New Zealand
| | - Keith C. Gordon
- MacDiarmid Institute for Advanced Materials and Nanotechnology, Department of Chemistry, University of Otago, Dunedin, New Zealand
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Bullock JP, Carter E, Johnson R, Kennedy AT, Key SE, Kraft BJ, Saxon D, Underwood P. Reactivity of Electrochemically Generated Rhenium (II) Tricarbonyl α-Diimine Complexes: A Reinvestigation of the Oxidation of Luminescent Re(CO)3(α-Diimine)Cl and Related Compounds. Inorg Chem 2008; 47:7880-7. [DOI: 10.1021/ic800530n] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- John P. Bullock
- The Division of Natural Science and Mathematics, Bennington College, Bennington, Vermont 05201, and The Department of Chemistry, Central Washington University, Ellensburg, Washington 98926
| | - Eric Carter
- The Division of Natural Science and Mathematics, Bennington College, Bennington, Vermont 05201, and The Department of Chemistry, Central Washington University, Ellensburg, Washington 98926
| | - Ryan Johnson
- The Division of Natural Science and Mathematics, Bennington College, Bennington, Vermont 05201, and The Department of Chemistry, Central Washington University, Ellensburg, Washington 98926
| | - Abigail T. Kennedy
- The Division of Natural Science and Mathematics, Bennington College, Bennington, Vermont 05201, and The Department of Chemistry, Central Washington University, Ellensburg, Washington 98926
| | - Sarah E. Key
- The Division of Natural Science and Mathematics, Bennington College, Bennington, Vermont 05201, and The Department of Chemistry, Central Washington University, Ellensburg, Washington 98926
| | - Brian J. Kraft
- The Division of Natural Science and Mathematics, Bennington College, Bennington, Vermont 05201, and The Department of Chemistry, Central Washington University, Ellensburg, Washington 98926
| | - David Saxon
- The Division of Natural Science and Mathematics, Bennington College, Bennington, Vermont 05201, and The Department of Chemistry, Central Washington University, Ellensburg, Washington 98926
| | - Patrick Underwood
- The Division of Natural Science and Mathematics, Bennington College, Bennington, Vermont 05201, and The Department of Chemistry, Central Washington University, Ellensburg, Washington 98926
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18
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Theoretical studies on the structures and spectroscopic properties of rhenium(I) acetylide diimine complexes. ACTA ACUST UNITED AC 2008. [DOI: 10.1016/j.theochem.2008.01.001] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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19
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McGoverin CM, Walsh TJ, Gordon KC, Kay AJ, Woolhouse AD. Predicting nonlinear optical properties in push–pull molecules based on methyl pyridinium donor and 3-cyano-5,5-dimethyl-2(5H)-furanylidene-propanedinitrile acceptor units using vibrational spectroscopy and density functional theory. Chem Phys Lett 2007. [DOI: 10.1016/j.cplett.2007.06.068] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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20
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Coe BJ, Curati NRM, Fitzgerald EC, Coles SJ, Horton PN, Light ME, Hursthouse MB. Syntheses and Properties of Bimetallic Chromophore-Quencher Assemblies Containing Ruthenium(II) and Rhenium(I) Centers. Organometallics 2007. [DOI: 10.1021/om070042x] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Benjamin J. Coe
- School of Chemistry, University of Manchester, Oxford Road, Manchester M13 9PL, U.K., and EPSRC National Crystallography Service, School of Chemistry, University of Southampton, Highfield, Southampton SO17 1BJ, U.K
| | - Naomi R. M. Curati
- School of Chemistry, University of Manchester, Oxford Road, Manchester M13 9PL, U.K., and EPSRC National Crystallography Service, School of Chemistry, University of Southampton, Highfield, Southampton SO17 1BJ, U.K
| | - Emma C. Fitzgerald
- School of Chemistry, University of Manchester, Oxford Road, Manchester M13 9PL, U.K., and EPSRC National Crystallography Service, School of Chemistry, University of Southampton, Highfield, Southampton SO17 1BJ, U.K
| | - Simon J. Coles
- School of Chemistry, University of Manchester, Oxford Road, Manchester M13 9PL, U.K., and EPSRC National Crystallography Service, School of Chemistry, University of Southampton, Highfield, Southampton SO17 1BJ, U.K
| | - Peter N. Horton
- School of Chemistry, University of Manchester, Oxford Road, Manchester M13 9PL, U.K., and EPSRC National Crystallography Service, School of Chemistry, University of Southampton, Highfield, Southampton SO17 1BJ, U.K
| | - Mark E. Light
- School of Chemistry, University of Manchester, Oxford Road, Manchester M13 9PL, U.K., and EPSRC National Crystallography Service, School of Chemistry, University of Southampton, Highfield, Southampton SO17 1BJ, U.K
| | - Michael B. Hursthouse
- School of Chemistry, University of Manchester, Oxford Road, Manchester M13 9PL, U.K., and EPSRC National Crystallography Service, School of Chemistry, University of Southampton, Highfield, Southampton SO17 1BJ, U.K
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Howell SL, Gordon KC. Vibrational Spectroscopy of Reduced Re(I) Complexes of 1,10-Phenanthroline and Substituted Analogues. J Phys Chem A 2006; 110:4880-7. [PMID: 16599458 DOI: 10.1021/jp056614d] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
IR spectroscopy in concert with DFT calculations and resonance Raman spectroelectrochemistry has been used to identify the molecular orbital nature of the singly occupied molecular orbital (SOMO) in reduced [Re(CO)(3)Cl(L)] and [Re(CO)(3)(4-Mepy)(L)](+) complexes, where L = 1,10-phenanthroline and its 4,7-diphenyl- and 3,4,7,8-tetramethyl-substituted analogues. The SOMO of each reduced species considered was found to be of b(1) symmetry, rather than the close lying orbital of a(2) symmetry (within a C(2)(v)() symmetry description of the phenanthroline moiety). This was deduced in a number of ways. First, the average carbonyl band force constants (Deltak(av) = k(av){reduced complex} - k(av){parent complex}) range from -57 to -41 N m(-1) for the series of compounds studied. The value of Deltak(av) relates to the extent of orbital overlap between the ligand MO and the metal dpi MO. These values are consistent with population of a b(1) MO because the wave function amplitude at the chelating nitrogens for this MO is significantly greater than that for a(2) MO. Second, calculations on singly reduced [Re(CO)(3)(4-Mepy)(phen)](+) and [Re(CO)(3)(4-Mepy)(tem)](+) predict population of a b(2) SOMO. The spectra predicted for these species are in close agreement with the vibrational spectroscopic data; for the IR data the shifts in the CO bands are predicted to 6 cm(-1) and the mean absolute deviation between calculated and measured Raman bands was found to be 10 cm(-1).
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Affiliation(s)
- Sarah L Howell
- Department of Chemistry, MacDiarmid Institute for Advanced Materials and Nanotechnology, University of Otago, Union Place, Dunedin, New Zealand
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