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

Trivalent lanthanide ions have emerged as promising candidates for precise and remote temperature sensing. Among them, Pr-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-based coordination polymer, {[PrPt(CN)(4,4'-bpyO)(HO)]·4HO} (), as a rare example of Pr luminescent thermometry. Coordination between Pr ions, cyanido-bridged Pt centers, and 4,4'-bpyO 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 and a minimum temperature uncertainty of 0.2 K.