Mononuclear copper(i) complexes bearing a 3-phenyl-5-(pyridin-4-yl)-1,2,4-triazole ligand: synthesis, crystal structure, TADF-luminescence, and mechanochromic effects

New highly luminescent heteroleptic copper( i ) halide complexes, [CuL(PPh 3 ) 2 X] (X = Cl, Br, I), based on 3-phenyl-5-(pyridin-4-yl)-1,2,4-triazole (L) and triphenylphosphine (PPh 3 ) ligands were successfully synthesis and structurally characterized.