SEARCH Articles Figures Tables Absorption spectra electronics Complexes macrocycles Electron absorption Electron absorption spectra Electronic absorption Electronic absorption spectra Electronic absorption spectra, macrocyclic complexes Macrocycle complexes Macrocyclic complexes Nickel absorption spectra Nickel complexes macrocycles Nickel complexes spectra Nickel macrocycle Nickel macrocyclic complexes Nickel spectrum Nickel-macrocycle complex