Chelating N,N′-(bis(pyridin-2-yl)alkylidene)propane-1,3-diamine pseudohalide copper(II) and cadmium(II) coordination compounds: Synthesis, structure and luminescence properties of [M(bpap)(X)]ClO4 and [M(bpap)(X)2] [M = Cu, Cd; X=N3-, NCS−]

The chelating ligand, N,N′-(bis(pyridin-2-yl)alkylidene)propane-1,3-diamine (bpap) is used to synthesise complexes of type [Cu(bpap)(N3/NCS)]ClO4 (1a-3b) and [Cd(bpap)(N3/NCS)2] (4a-6b). Elemental, spectral, electrochemical and other physicochemical results characterize the complexes. The structures of [Cu(bpbp)(N3)]ClO4 (3a) and [Cd(bpbp)(NCS)2] (6b) have been solved using X-ray diffraction. All the complexes display intraligand 1(π-π*) fluorescence and intraligand 3(π-π*) phosphorescence in glassy solutions (MeOH at 77 K).