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(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.