Luminescence thermometry and field induced slow magnetic relaxation based on a near infrared emissive heterometallic complex


The 1 : 1 : 1 reaction of YbCl3 center dot 6H(2)O, K-3[Co(CN)(6)] and bpyO(2) in H2O has provided access to a complex with formula [YbCo(CN)(6)(bpyO(2))(2)(H2O)(3)]center dot 4H(2)O (1) in a very good yield while its structure has been determined by single-crystal X-ray crystallography and characterised based on elemental analyses and IR spectra. Magnetic susceptibility studies showed the complex to be a field induced single molecule magnet, as confirmed by mu-SQUID measurements. CASSCF calculations confirm the existence of a m(J) = 7/2 ground state, with rather large transverse components, responsible for the fast relaxation characteristic of compound 1 at zero DC field, which is reduced upon application of DC fields. Moreover, a combination of luminescence studies along with CASSCF calculation allows the identification of the band structure of the complex, which is ultimately related to its electronic properties. Compound 1 operates as a luminescent thermometer in the 125-300 K range with a maximum relative thermal sensitivity of approximate to 0.1% K-1 at 180 K.






Karachousos-Spiliotakopoulos, K; Tangoulis, V; Panagiotou, N; Tasiopoulos, A; Moreno-Pineda, E; Wernsdorfer, W; Schulze, M; Botas, AMP; Carlos, LD

nossos autores


This work was developed within the scope of the project CICECO-Aveiro Institute of Materials, UIDB/50011/2020, UIDP/50011/2020 & LA/P/0006/2020, financed by national funds through the FCT/MEC (PIDDAC). EMP thanks the Panamanian National System of Investigators (SNI, SENACYT) for support. W. W. thanks the A. v. Humboldt foundation and the ERC grant MoQuOS No. 741276.

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