Series of Near-IR-Absorbing Transition Metal Complexes with Redox Active Ligands
Salojärvi, E., Peuronen, A., Lahtinen, M., Huhtinen, H., Vlasenko, L. S., Lastusaari, M., & Lehtonen, A. (2020). Series of Near-IR-Absorbing Transition Metal Complexes with Redox Active Ligands. Molecules, 25(11), Article 2531. https://doi.org/10.3390/molecules25112531
© 2020 the Author(s)
New soluble and intensely near-IR-absorbing transition metal (Ti, Zr, V, Ni) complexes were synthesized using a redox non-innocent N,N’-bis(3,5-di-tertbutyl-2-hydroxy-phenyl) -1,2-phenylenediamine (H4L) as a ligand precursor. In all the complexes, ([Ti(Lox)2, [Zr(Lox)2], [V(Lsq1)(HLox)] and [Ni(HLox)2], two organic molecules coordinate to the metal center as tri- or tetradentate ligands. The solid-state structures of the complexes were determined using single crystal XRD, and the compounds were further characterized with Electrospray Ionisation Mass Spectrometry (ESI-MS). Thermoanalytical measurements indicated the thermal stabilities of the complexes. All compounds absorb strongly in the near-IR region and show very interesting magnetic and electrochemical properties. Moreover, it was shown that the V and Ni complexes can also convert absorbed near-IR photons to (un)paired electrons, which indicates great promise in photovoltaic applications.
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Additional information about fundingThis research was funded by the Walther Ahlström foundation and the Magnus Ehrnrooth foundation. A.P. gratefully acknowledges the funding from the Academy of Finland (no. 315911). We gratefully acknowledge the computational resources provided by CSC-IT Center for Science in Finland.
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