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Lepper M, Köbl J, Zhang L, et al. Controlling the Self-Metalation Rate of Tetraphenylporphyrins on Cu(111) via Cyano Functionalization. Angew Chem Int Ed Engl. 2018;57(32):10074-10079doi: 10.1002/anie.201803601.
Lepper, M., Köbl, J., Zhang, L., Meusel, M., Hölzel, H., Lungerich, D., Jux, N., de Siervo, A., Meyer, B., Steinrück, H. P., & Marbach, H. (2018). Controlling the Self-Metalation Rate of Tetraphenylporphyrins on Cu(111) via Cyano Functionalization. Angewandte Chemie (International ed. in English), 57(32), 10074-10079. https://doi.org/10.1002/anie.201803601
Lepper, Michael, et al. "Controlling the Self-Metalation Rate of Tetraphenylporphyrins on Cu(111) via Cyano Functionalization." Angewandte Chemie (International ed. in English) vol. 57,32 (2018): 10074-10079. doi: https://doi.org/10.1002/anie.201803601
Lepper M, Köbl J, Zhang L, Meusel M, Hölzel H, Lungerich D, Jux N, de Siervo A, Meyer B, Steinrück HP, Marbach H. Controlling the Self-Metalation Rate of Tetraphenylporphyrins on Cu(111) via Cyano Functionalization. Angew Chem Int Ed Engl. 2018 Aug 06;57(32):10074-10079. doi: 10.1002/anie.201803601. Epub 2018 Jun 14. PMID: 29714820.
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Angew Chem Int Ed Engl. 2018 Aug 06;57(32):10074-10079. doi: 10.1002/anie.201803601. Epub 2018 Jun 14.

Controlling the Self-Metalation Rate of Tetraphenylporphyrins on Cu(111) via Cyano Functionalization.

Angewandte Chemie (International ed. in English)

Michael Lepper, Julia Köbl, Liang Zhang, Manuel Meusel, Helen Hölzel, Dominik Lungerich, Norbert Jux, Abner de Siervo, Bernd Meyer, Hans-Peter Steinrück, Hubertus Marbach

Affiliations

  1. Lehrstuhl für Physikalische Chemie II, Universität Erlangen-Nürnberg, Egerlandstrasse 3, 91058, Erlangen, Germany.
  2. Interdisciplinary Center for Molecular Materials (ICMM), Universität Erlangen-Nürnberg, Germany.
  3. Lehrstuhl für Organische Chemie II, Universität Erlangen-Nürnberg, Germany.
  4. Instituto de Fisica Gleb Wataghin, Universidade Estadual de Campinas, Brazil.
  5. Computer-Chemistry-Center (CCC), Universität Erlangen-Nürnberg, Germany.

PMID: 29714820 DOI: 10.1002/anie.201803601

Abstract

The reaction rate of the self-metalation of free-base tetraphenylporphyrins (TPPs) on Cu(111) increases with the number of cyano groups (n=0, 1, 2, 4) attached at the para positions of the phenyl rings. The findings are based on isothermal scanning tunneling microscopy (STM) measurements. At room temperature, all investigated free-base TPP derivatives adsorb as individual molecules and are aligned with respect to densely packed Cu substrate rows. Annealing at 400 K leads to the formation of linear dimers and/or multimers via CN-Cu-CN bonds, accompanied by self-metalation of the free-base porphyrins following a first-order rate equation. When comparing the non-cyano-functionalized and the tetracyano-functionalized molecules, we find a decrease of the reaction rate by a factor of more than 20, corresponding to an increase of the activation energy from 1.48 to 1.59 eV. Density functional theory (DFT) calculations give insights into the influence of the peripheral electron-withdrawing cyano groups and explain the experimentally observed effects.

© 2018 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.

Keywords: cyano functionalization; porphyrinoids; scanning tunneling microscopy; self-metalation; surface chemistry

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