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

abstract

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.

keywords

YTTERBIUM COMPLEX; DY-III; TEMPERATURE; 2,2'-BIPYRIDINE-1,1'-DIOXIDE; NANOPARTICLES; ANISOTROPY; LIGHT

subject category

Chemistry

authors

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

our authors

acknowledgements

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.

Share this project:

Related Publications

We use cookies for marketing activities and to offer you a better experience. By clicking “Accept Cookies” you agree with our cookie policy. Read about how we use cookies by clicking "Privacy and Cookie Policy".