Synthesis, characterization and luminescence properties of copper(I) complexes containing 2-phenyl-3-(benzylamino)-1,2-dihydroquinazolin-4(3H)-one and triphenylphosphine as ligands

Some copper(I) complexes of the formula [Cu(L)(PPh3)2]X (1–4) [where L = 2-phenyl-3-(benzylamino)-1,2-dihydroquinazolin-4(3H)-one; PPh3 = triphenylphosphine; X = Cl−, NO3−, ClO4− and BF4−] have been prepared and characterized on the basis of elemental analysis, IR, UV–Vis and 1H NMR spectral studies. The representative complex of the series 4 has been characterized by single crystal X-ray diffraction which reveal that in the complex the central copper(I) ion assumes the irregular distorted-tetrahedral geometry. Cyclic voltammetry of the complexes indicate a quasireversible redox behavior corresponding to Cu(II)/Cu(I) couple. All the complexes exhibit intraligand (π → π∗) fluorescence with high quantum yield in dichloromethane solution.

Some copper(I) complexes of 2-phenyl-3-(benzylamino)-1,2-dihydroquinazolin-4(3H)-one and triphenylphosphine have been prepared and characterized by elemental analysis, IR, UV–Vis and 1H NMR spectral studies. Single crystal X-ray diffraction of [Cu(L)(PPh3)2]BF4 shows irregular distorted-tetrahedral geometry. All the complexes exhibit intraligand (π → π∗) fluorescence with high quantum yield in dichloromethane solution.Figure optionsDownload as PowerPoint slideHighlights
► Synthesis of mixed ligand copper(I) complexes.
► Characterization by elemental analysis, IR, UV–Vis and 1H NMR spectral studies.
► X-ray diffraction of complex 4 reveal that the central copper(I) ion assumes highly distorted tetrahedral geometry.
► All the complexes exhibit intraligand (π → π∗) fluorescence with high quantum yield in dichloromethane solution.