Abstract
Seven‐coordinate TbIII complexes with strong luminescence and thermosensing properties are reported. Mononuclear [Tb(tmh)3(PEB)] [tmh: 2,2,6,6‐tetramethyl‐3,5‐heptanedione, PEB: (diphenylphosphoryl)ethynyl]benzene and dinuclear [Tb2(tmh)6(m‐BPEB)] [m‐BPEB: 1,3‐bis(diphenylphosphoryl)ethynyl]benzene were characterized by single‐crystal X‐ray analysis. The quantum yields of [Tb(tmh)3(PEB)] and [Tb2(tmh)6(m‐BPEB)] were estimated to be 71 and 39 %, respectively. Thermosensing properties are evaluated by temperature‐dependent emission lifetime measurements (Arrhenius analysis), which are affected by the presence of ligand‐to‐ligand charge transfer (LLCT) bands. The LLCT bands are confirmed by DFT calculations.
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