Luminescent Thermometer Based on a Praseodymium(iii) Cyanide-Based Metal-Organic Framework

abstract

Trivalent lanthanide ions have emerged as promising candidates for precise and remote temperature sensing. Among them, Pr3+-based luminescent thermometers remain underexplored, particularly those operating in the near-infrared (NIR) spectral region. This work presents the synthesis and thorough characterization of a novel Pr3+-based coordination polymer, {[Pr2 IIIPt3 II(CN)12(4,4 '-bpyO2)4(H2O)6]4H2O}n (1), as a rare example of Pr3+ luminescent thermometry. Coordination between Pr3+ ions, cyanido-bridged Pt2+ centers, and 4,4 '-bpyO2 ligands enables efficient energy transfer, producing luminescence in visible and near-infrared regions. The polymer demonstrates distinct temperature-dependent luminescence over a wide range (12-386 K), with relative thermal sensitivities of congruent to 1%K-1 and a minimum temperature uncertainty of 0.2 K.

keywords

FLUORESCENCE INTENSITY RATIO; PR3+ LUMINESCENCE; TEMPERATURE-RANGE; PHOTOLUMINESCENCE; COMPLEXES; EMISSION

subject category

Chemistry

authors

Lalioti, N; Zygouri, E; Nastopoulos, V; Panagiotou, N; Brites, CDS; Carlos, LD; Corredoira-Vázquez, J; Tangoulis, V

our authors

acknowledgements

This work was developed within the scope of the project CICECO-Aveiro Institute of Materials, UIDB/50011/2020, UIDP/50011/2020, and LA/P/0006/2020, financed by Portuguese funds through the FCT/MECI (PIDDAC). J.C.V. also thanks Xunta de Galicia for his postdoctoral fellowship.

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