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Photochemistry of [Ru(pytz)(btz)2]2+ and Characterization of a κ1-btz Ligand-Loss Intermediate
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    Photochemistry of [Ru(pytz)(btz)2]2+ and Characterization of a κ1-btz Ligand-Loss Intermediate
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    Department of Chemistry, University of Huddersfield, Queensgate, Huddersfield HD1 3DH, United Kingdom
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    Inorganic Chemistry

    Cite this: Inorg. Chem. 2016, 55, 15, 7787–7796
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    https://doi.org/10.1021/acs.inorgchem.6b00782
    Published July 21, 2016
    Copyright © 2016 American Chemical Society

    Abstract

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    We report the synthesis, characterization, and photochemical reactivity of the triazole-containing complex [Ru(pytz)(btz)2]2+ (1, pytz = 1-benzyl-4-(pyrid-2-yl)-1,2,3-triazole, btz = 1,1′-dibenzyl-4,4′-bi-1,2,3-triazolyl). The UV–vis absorption spectrum of 1 exhibits pytz- and btz-centered 1MLCT bands at 365 and 300 nm, respectively. Upon photoexcitation, acetonitrile solutions of 1 undergo conversion to the ligand-loss intermediate, trans-[Ru(pytz)(κ2-btz)(κ1-btz)(NCMe)]2+ (2, Φ363 = 0.013) and ultimately to the ligand-loss product trans-[Ru(pytz)(btz)(NCMe)2]2+ (3), both of which are observed and characterized by 1H NMR spectroscopy. Time-dependent density functional theory calculations reveal that the S1 state of the complex has primarily HOMO → LUMO pytz-based 1MLCT character. Data show that the 3MLCT and 3MC states are in close energetic proximity (≤0.11 eV to 2 d.p.) and that the T1 state from a single-point triplet state calculation at the S0 geometry suggests 3MC character. Optimization of the T1 state of the complex starting from the ground state geometry leads to elongation of the two Ru–N(btz) bonds cis to the pytz ligand to 2.539 and 2.544 Å leading to a pseudo-4-coordinate 3MC state rather than the 3MLCT state. The work therefore provides additional insights into the photophysical and photochemical properties of ruthenium triazole-containing complexes and their excited state dynamics.

    Copyright © 2016 American Chemical Society

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    Supporting Information

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    The Supporting Information is available free of charge on the ACS Publications website at DOI: 10.1021/acs.inorgchem.6b00782.

    • Electrochemical data, mass spectrometry data, optimized geometry coordinates for S0 and T1 states of 1, and molecular orbital plots for the ground state of 1 (PDF)

    • Crystallographic data for [Ru(pytz)(btz)2][PF6]2 (CIF)

    • Crystallographic data for [Ru(p-cymene)(pytz)Cl][PF6]·MeCN (CIF)

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    Inorganic Chemistry

    Cite this: Inorg. Chem. 2016, 55, 15, 7787–7796
    Click to copy citationCitation copied!
    https://doi.org/10.1021/acs.inorgchem.6b00782
    Published July 21, 2016
    Copyright © 2016 American Chemical Society

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