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Two cationic heteroleptic four-coordinate Cu(I) complexes were successfully synthesized and characterized by  1 H NMR,  13 C NMR,  31 P NMR spectroscopy and mass spectrometry. The crystal structures of the complexes have been determined by single-crystal X-ray diffraction. UV/Visible absorption spectra of these complexes show ligand-centered  π - π * and charge transfer transitions. In the solid state the complexes show intense emissions with microsecond-scale lifetime and relatively high efficiency at room temperature. The photophysical behavior at  T  = 298 and 77 K indicates that the emissions of these complexes are thermally activated delayed fluorescence mixed with phosphorescence.

Synthesis, structures and photophysical properties of two new Cu(I) complexes