The syntheses, characterization and fluorescence spectra of novel, octakis(alkylthiophthalocyanato) nickel(II) and palladium(II) complexes

The syntheses, characterization and fluorescence studies of several {octakis(alkylthio)phthalocyanato} palladium(II) and nickel(II) complexes are presented. The absorption spectra of some of the complexes showed extra peaks which are attributable to non-planar distortion, the extent of which, was found to dependent on alkyl chain length. The fluorescence excitation spectra of the nickel(II) derivatives were not in agreement with their absorption spectra, owing to structural changes upon excitation. Fluorescence quantum yields were very low (<1%) for all complexes as a consequence of the open-shell electronic structures of nickel(II) and palladium(II).