“…The N-substitution can be used for fine-tuning the optical properties [15]. The complex formation of dap with transition metal ions (Fe, Co, Ni, Cu, Zn, Ru, Os, Re, Pd, Pt, Ag, Cd) in the gas phase has been studied by electrospray ionization mass spectrometry [16,17]. Heteroleptic polymetallic Ag(I) and Cu(I) complexes were obtained and a multidentate ligand containing a large N,P,N,P,N core yielding interesting structures with π-π stacked columns or discrete sixfold stacks [18].…”