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Homoleptic complexes of a porphyrinatozinc(ii)-2,2′:6′,2′′-terpyridine ligand

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Abstract

Three homoleptic complexes containing the metalloligand 7-(4-([2,2′:6′,2′′-terpyridin]-4′-yl)phenyl)-5,10,15,20-tetraphenylporphyrinatozinc(ii), 1, have been prepared. [Zn(1)2][PF6]2, [Fe(1)2][PF6]2 and [Ru(1)2][PF6]2 were characterized by 1H and 13C NMR spectroscopy and mass spectrometry, and the electrochemical and photophysical properties of the complexes have been investigated. In solution, each complex undergoes two reversible porphyrin-centred oxidation processes, with an additional reversible metal-centred oxidation for [Fe(1)2][PF6]2 and [Ru(1)2][PF6]2. Solution absorption spectra are dominated by the Soret and Q bands of the metalloligand 1. Spectroelectrochemical data for the complexes are presented. The results of a nanosecond transient absorption spectroscopic investigation of [Zn(1)2][PF6]2, [Fe(1)2][PF6]2 and [Ru(1)2][PF6]2 are presented. For [Zn(1)2][PF6]2, S1 excitation leads to an efficient intersystem-crossing to the T1 state, whilst for [Fe(1)2][PF6]2, excitation of the 1MLCT transition is followed by fast deactivation to the 3MC state followed by thermal decay to the ground state. Excitation of the 1MLCT transition of [Ru(1)2][PF6]2 results in an intersystem crossing to 3MLCT; triplet-to-triplet energy transfer occurs giving the [Zn(TPP)] T1 state which regenerates the ground state of the complex.

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Acknowledgments

We acknowledge the Swiss National Science Foundation as part of the NCCR Molecular Systems Engineering, and the University of Basel for financial support. The SNF R’Equip program is acknowledged for grant number 206021_157687/1.

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Authors and Affiliations

  1. Department of Chemistry, University of Basel, Spitalstrasse 51, CH-4056, Basel, Switzerland

    Angelo Lanzilotto, Edwin C. Constable & Catherine E. Housecroft

  2. Department of Chemistry, University of Basel, St. Johanns-Ring 19, CH-4056, Basel, Switzerland

    Martin Kuss-Petermann & Oliver S. Wenger

Authors
  1. Angelo Lanzilotto
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  2. Martin Kuss-Petermann
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  3. Oliver S. Wenger
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  4. Edwin C. Constable
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  5. Catherine E. Housecroft
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Correspondence to Catherine E. Housecroft.

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Lanzilotto, A., Kuss-Petermann, M., Wenger, O.S. et al. Homoleptic complexes of a porphyrinatozinc(ii)-2,2′:6′,2′′-terpyridine ligand. Photochem Photobiol Sci 16, 585–595 (2017). https://doi.org/10.1039/c6pp00425c

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