We present a study of the static magnetic properties and spin dynamics in cobalt valence tautomers (VT), molecules where a low spin (LS) to high spin (HS) crossover driven by an intramolecular electron transfer can be controlled by the temperature, by the external pressure, or by light irradiation. In the investigated complex, a LS-Co(III) ion bound to a dinegative organic ligand can be reversibly converted into the HS-Co(II) bound to a mononegative one. By combining magnetization measurements with nuclear magnetic resonance (NMR) and muon spin relaxation (μSR), we have investigated the static magnetic properties and the spin dynamics as a function of the temperature. Moreover, the effect of the external pressure as well as of the infrared light irradiation has been explored through magnetometry and NMR measurements to determine the spin dynamics of the HS state. The photoinduced HS state, which can have a lifetime of several hours below 30 K, is characterized by spin dynamics in the MHz range, which persist at least down to 10 K. The application of an external pressure causes a progressive increase of the LS-HS crossover, which reaches room temperature for pressures around 10 kbar.

Spin fluctuations in the light-induced high-spin state of cobalt valence tautomers / Caracciolo F.; Mannini M.; Poneti G.; Pregelj M.; Jansa N.; Arcon D.; Carretta P.. - In: PHYSICAL REVIEW. B. - ISSN 2469-9950. - STAMPA. - 98:(2018), pp. 1-5. [10.1103/PhysRevB.98.054416]

Spin fluctuations in the light-induced high-spin state of cobalt valence tautomers

Mannini M.;Poneti G.;
2018

Abstract

We present a study of the static magnetic properties and spin dynamics in cobalt valence tautomers (VT), molecules where a low spin (LS) to high spin (HS) crossover driven by an intramolecular electron transfer can be controlled by the temperature, by the external pressure, or by light irradiation. In the investigated complex, a LS-Co(III) ion bound to a dinegative organic ligand can be reversibly converted into the HS-Co(II) bound to a mononegative one. By combining magnetization measurements with nuclear magnetic resonance (NMR) and muon spin relaxation (μSR), we have investigated the static magnetic properties and the spin dynamics as a function of the temperature. Moreover, the effect of the external pressure as well as of the infrared light irradiation has been explored through magnetometry and NMR measurements to determine the spin dynamics of the HS state. The photoinduced HS state, which can have a lifetime of several hours below 30 K, is characterized by spin dynamics in the MHz range, which persist at least down to 10 K. The application of an external pressure causes a progressive increase of the LS-HS crossover, which reaches room temperature for pressures around 10 kbar.
2018
98
1
5
Goal 9: Industry, Innovation, and Infrastructure
Caracciolo F.; Mannini M.; Poneti G.; Pregelj M.; Jansa N.; Arcon D.; Carretta P.
File in questo prodotto:
File Dimensione Formato  
Caracciolo.pdf

Accesso chiuso

Tipologia: Pdf editoriale (Version of record)
Licenza: Tutti i diritti riservati
Dimensione 772.44 kB
Formato Adobe PDF
772.44 kB Adobe PDF   Richiedi una copia

I documenti in FLORE sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificatore per citare o creare un link a questa risorsa: https://hdl.handle.net/2158/1213131
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 2
  • ???jsp.display-item.citation.isi??? 2
social impact