Luminescent Thermometer Based on a Praseodymium(iii) Cyanide-Based Metal–Organic Framework
N. Lalioti, Eleni Zygouri, Vassilis Nastopoulos, Nikos Panagiotou, Carlos D. S. Brites, Luís D. Carlos, Julio Corredoira‐Vázquez, V. Tangoulis
Abstract
High Resolution Image Download MS PowerPoint Slide Trivalent lanthanide ions have emerged as promising candidates for precise and remote temperature sensing. Among them, Pr 3+ -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 Pr 3+ -based coordination polymer, {[Pr 2 III Pt 3 II (CN) 12 (4,4′-bpyO 2 ) 4 (H 2 O) 6 ]·4H 2 O} n ( 1 ), as a rare example of Pr 3+ luminescent thermometry. Coordination between Pr 3+ ions, cyanido-bridged Pt 2+ centers, and 4,4′-bpyO 2 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 ≅1%·K –1 and a minimum temperature uncertainty of 0.2 K.