Synthesis of 4-substituted azopyridine-functionalized Ni(II) porphyrins as molecular spin switches

  1. Jannis Ludwig,
  2. Tobias Moje,
  3. Fynn Röhricht and
  4. Rainer HergesORCID Logo

Submitting author affiliation: Universität Kiel, Kiel, Germany

Beilstein Arch. 2020, 202096. https://doi.org/10.3762/bxiv.2020.96.v1

Published 25 Aug 2020

  • Preprint

Abstract

We present the synthesis and the spin switching efficiencies of Ni(II)-porphyrins substituted with azopyridines as covalently attached photoswitchable ligands. The molecules are designed in such a way that the azopyridines coordinate to the Ni ion if the azo unit is in cis configuration. For steric reasons no intramolecular coordination is possible if the azopyridine unit adopts the trans configuration. Photoisomerization of the azo unit between cis and trans is achieved upon irradiation with 505 nm (transcis) and 435 nm (cistrans). Concurrently with the isomerization and coordination/decoordination, the spin state of the Ni ion switches between singlet (low-spin) and triplet (high-spin). Previous studies have shown that the spin switching efficiency is strongly dependent on the solvent and on the substituent at the 4-position of the pyridine unit. We now introduced thiol, disulfide, thioethers, nitrile and carboxylic acid groups and investigated their spin switching efficiency.

Keywords: azopyridines; Ni(II) porphyrins; photoswitch; record player molecules; spin switch, spin state

Supporting Information

Format: DOCX Size: 5.7 MB   Download

How to Cite

When a peer-reviewed version of this preprint is available, this information will be updated in the information box above. If no peer-reviewed version is available, please cite this preprint using the following information:

Ludwig, J.; Moje, T.; Röhricht, F.; Herges, R. Beilstein Arch. 2020, 202096. doi:10.3762/bxiv.2020.96.v1

Download Citation
Download RIS (Reference Manager) Download BIB (BIBTEX)

© 2020 Ludwig et al.; licensee Beilstein-Institut.
This is an Open Access article under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0). Please note that the reuse, redistribution and reproduction in particular requires that the authors and source are credited.
The license is subject to the Beilstein Archives terms and conditions: (https://www.beilstein-archives.org/xiv/terms)

Other Beilstein-Institut Open Science Activities

Logo
Logo
Logo
Symposia