Seven copper (I) complexes of diphosphine ligands and N^N ligands: Syntheses, structural characterizations and spectroscopic properties

Abstract The reactions of diphosphine ligands and nitrogen-containing ligands with Cu(I) salts in the mixed solvents of methanol (MeOH) and dichloromethane (CH 2 Cl 2 ) generated the corresponding complexes, {[Cu(dppbe)(Bphen)](ClO 4 )·2CH 3 OH} n ( 1 ), {[Cu 2 (dppe)(dmp) 2 (CN) 2 ]·2CH 3 OH} n ( 2 ), {[Cu 2 (dppb)(dmp) 2 I 2 ]·2CH 3 OH} n ( 3 ), [Cu(POP)(C 16 H 6 N 6 )]I ( 4 ), {[Cu(POP)(C 16 H 6 N 6 )](SCN)} n ( 5 ), [Cu(xantphos)(bpy)](ClO 4 ) ( 6 ) and {[Cu(xantphos)(bpy)](CF 3 SO 3 )} n ( 7 ) {dppbe = 1,2-bis(diphenylphosphanyl)benzene, dppe = 1,2-bis(diphenylphosphino)ethane; dppb = 1,4-bis(diphenylphosphino)butane, POP = bis[2-(diphenylphosphino)phenyl]ether, xantphos = 4,5-bis (diphenylphosphio)-9,9-dimethylxanthene, Bphen = 4,7-diphenyl-1,10-phenanthroline, dmp = 2,9-dimethyl-1,10-phenanthroline, C 16 H 6 N 6  = [2,3-f]-pyrazino-[1,10]phenanthroline-2,3-dicarbonitrile, bpy = 2,2′-bipyridine}. These complexes were all characterized by single-crystal X-ray crystallography, elemental analysis, IR, 1 H NMR spectroscopy, luminescence and THz spectroscopy. Complexes 1 and 2 consist of 1D infinite zigzag chain structures which are linked by hydrogen bonds, while complexes 3 , 5 and 7 have 2D topological architectures which are connected by hydrogen bonds, complex 4 has an annular structure and complex 6 is a mononuclear structure. The types of hydrogen bonds, choice of solvents and coordination modes of the ligands are of importance in defining the structural and topological features of the resulting networks. Furthermore, complexes 1 – 7 exhibit interesting luminescence in the solid state at room temperature. Complexes 1 – 3 can act as yellow luminophores, complex 4 acts as a red luminophore, complex 5 acts as an orange luminophore and complexes 6 – 7 act as green luminophores. Their terahertz spectra show more accurate characteristics of their structures.