Autoren:	Dorn, Matthias Hunger, David Förster, Christoph Naumann, Robert van Slageren, Joris Heinze, Katja
Titel:	Towards luminescent vanadium(II) complexes with slow magnetic relaxation and quantum coherence
Online-Publikationsdatum:	7-Mär-2024
Erscheinungsdatum:	2022
Sprache des Dokuments:	Englisch
Zusammenfassung/Abstract:	Molecular entities with doublet or triplet ground states find increasing interest as potential molecular quantum bits (qubits). Complexes with higher multiplicity might even function as qudits and serve to encode further quantum bits. Vanadium(II) ions in octahedral ligand fields with quartet ground states and small zero-field splittings qualify as qubits with optical read out thanks to potentially luminescent spin-flip states. We identified two V2+ complexes [V(ddpd)2]2+ with the strong field ligand N,N’-dimethyl-N,N’-dipyridine-2-yl-pyridine-2,6-diamine (ddpd) in two isomeric forms (cis-fac and mer) as suitable candidates. The energy gaps between the two lowest Kramers doublets amount to 0.2 and 0.5 cm−1 allowing pulsed EPR experiments at conventional Q-band frequencies (35 GHz). Both isomers possess spin-lattice relaxation times T1 of around 300 μs and a phase memory time TM of around 1 μs at 5 K. Furthermore, the mer isomer displays slow magnetic relaxation in an applied field of 400 mT. While the vanadium(III) complexes [V(ddpd)2]3+ are emissive in the near-IR-II region, the [V(ddpd)2]2+ complexes are non-luminescent due to metal-to-ligand charge transfer admixture to the spin-flip states.
DDC-Sachgruppe:	540 Chemie 540 Chemistry and allied sciences
Veröffentlichende Institution:	Johannes Gutenberg-Universität Mainz
Organisationseinheit:	FB 09 Chemie, Pharmazie u. Geowissensch.
Veröffentlichungsort:	Mainz
ROR:	https://ror.org/023b0x485
DOI:	http://doi.org/10.25358/openscience-10164
Version:	Published version
Publikationstyp:	Zeitschriftenaufsatz
Weitere Angaben zur Dokumentart:	Scientific article
Nutzungsrechte:	CC BY-NC
Informationen zu den Nutzungsrechten:	https://creativecommons.org/licenses/by-nc/4.0/
Zeitschrift:	Chemistry : a European journal 29 9
Seitenzahl oder Artikelnummer:	e202202898
Verlag:	Wiley
Verlagsort:	Weinheim
Erscheinungsdatum:	2022
ISSN:	1521-3765
DOI der Originalveröffentlichung:	10.1002/chem.202202898
Enthalten in den Sammlungen:	DFG-491381577-H