ELECTRON-ENERGY-LOSS AND X-RAY PHOTOELECTRON-SPECTRA .2. PHTHALOCYANINE AND ITS NI, CU AND CO DERIVATIVES IN THEIR ALPHA-FORM

The importance of the stacked structure of the molecules in the solid alpha-modification of phthalocyanine and some of its metal derivatives is illustrated in connection with the energy level distribution in th is type of macrocycle. The interband transitions and plasmons are expe rimentally studied by means of EELS and X-ray photoelectron techniques . The spectroscopic data are compared with other published experimenta l data and discussed in the light of the available theoretical informa tion. The comparison between the free ligand and its metal derivatives (Ni, Cu, Co) emphasizes the role of the metal 3d levels in the conduc tion processes.