Luminescence thermometry and field induced slow magnetic relaxation based on a near infrared emissive heterometallic complex
Ημερομηνία
2022-05-10Συγγραφέας
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Botas, Alexandre M. P.
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ISSN
1477-9226Εκδότης
Royal Society of ChemistryPlace of publication
Cambridge, U.K.Source
Dalton transactionsVolume
51Issue
21Pages
8208-8216Google Scholar check
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Εμφάνιση πλήρους εγγραφήςΕπιτομή
The 1 : 1 : 1 reaction of YbCl3·6H2O, K3[Co(CN)6] and bpyO2 in H2O has provided access to a complex with formula [YbCo(CN)6(bpyO2)2(H2O)3]·4H2O (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 μ-SQUID measurements. CASSCF calculations confirm the existence of a mJ = 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 ≈0.1% K−1 at 180 K.
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