151640 20251017144619.0 doi 10.1039/d0sc05856d sideral 126637 ART-2021-126637 eng Rubín-Osanz M. (orcid)0000-0002-4032-4064 Chemical tuning of spin clock transitions in molecular monomers based on nuclear spin-free Ni(ii) 2021 Access copy available to the general public Unrestricted We report the existence of a sizeable quantum tunnelling splitting between the two lowest electronic spin levels of mononuclear Ni complexes. The level anti-crossing, or magnetic “clock transition”, associated with this gap has been directly monitored by heat capacity experiments. The comparison of these results with those obtained for a Co derivative, for which tunnelling is forbidden by symmetry, shows that the clock transition leads to an effective suppression of intermolecular spin-spin interactions. In addition, we show that the quantum tunnelling splitting admits a chemical tuningviathe modification of the ligand shell that determines the crystal field and the magnetic anisotropy. These properties are crucial to realize model spin qubits that combine the necessary resilience against decoherence, a proper interfacing with other qubits and with the control circuitry and the ability to initialize them by cooling. info:eu-repo/grantAgreement/ES/DGA/E09-17R-Q-MAD info:eu-repo/grantAgreement/EC/H2020/862893/EU/Molecular spin qudits offering new hope for quantum computing/FATMOLS This project has received funding from the European Union’s Horizon 2020 research and innovation program under grant agreement No H2020 862893-FATMOLS info:eu-repo/grantAgreement/ES/MCINN/PCI2018-093116 info:eu-repo/grantAgreement/ES/MICINN/RTI2018-096075-B-C21 info:eu-repo/grantAgreement/EUR/MOLSPIN-COST/CA15128 info:eu-repo/semantics/openAccess by https://creativecommons.org/licenses/by/4.0/deed.es 9.969 2021 CHEMISTRY, MULTIDISCIPLINARY 25 / 179 = 0.14 2021 Q1 T1 2.878 2021 Chemistry (miscellaneous) 2021 Q1 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Lambert F. Shao F. Rivière E. Guillot R. Suaud N. Guihéry N. Zueco D. (orcid)0000-0003-4478-1948 Barra A.-L. Mallah T. Luis F. (orcid)0000-0001-6284-0521 12, 14 (2021), 5123-5133 Chem. sci. CHEMICAL SCIENCE 2041-6520 1709856 http://zaguan.unizar.es/record/151640/files/texto_completo.pdf Versión publicada 2651255 http://zaguan.unizar.es/record/151640/files/texto_completo.jpg?subformat=icon icon Versión publicada oai:zaguan.unizar.es:151640 articulos driver 2025-10-17-14:21:05 ARTICLE