Ligand Symmetry Modulates Singlet–Triplet Energy Gap for Tunable Luminescence Temperature Sensing Performance

The influence of reverse intersystem crossing on temperature response is a highly intriguing research topic for TADF materials. In this work, we report three isostructural Cu(I) coordination polymers featuring ligands with different symmetries. We tailor their singlet-triplet energy gap to systematically investigate its impact on temperature-responsive properties.