Synthesis, characterization and structural studies of some new homoleptic and heteroleptic diiminic and diphosphine copper(I) complexes

Cu(I) complexes are considered as a promising alternative with interesting photophysical properties to traditional noble-metal complexes that are mainly based on Ru(II) and Ir(III). Therefore, in recent years heteroleptic Cu(I) complexes of the type [Cu(N^N)(P^P)]+, [Cu(N^N)2]+ have been developed exhibiting impressive performance, e.g., long-lived excited-states, high emission quantum yields with tunable emission spectra as well as largely adjustable redox properties [1-2].we report synthesis and structural chemistry of some new homoleptic and heteroleptic Cu(I) complexes with new NN-diimine ligands and known heterocyclic diimines along with biphosphines. In our strategy, we tried to incorporate different substitution on the peripheral phenyl rings to pursue the stabilizing and directing effect of such group by increasing possibility of the intermolecular interaction such as C-H…π, π…π, dipolar CN…CN, NO2…NO2 and NO2…π of the respected Cu(I) complexes. The results showed that not only the nature of the substituents but also the rigidity and flexibility of the ligands are effective on the physicochemical properties of the related complexes.These complexes have been characterized using 1HNMR, 31PNMR, and FT-IR and their solid state structure determined by single crystal X-ray diffraction.