Left: Scheme of a metal phthalocyanine molecule structure. The local symmetry around the central transition metal ion is tetragonal (D 4h symmetry), the z-axis points along the normal of the molecular plane. Right: Sketch of the energy splitting as it is present for many MPc molecules, together with the corresponding orbitals. The x- and y-axis are oriented along the shortest M-N bonds.
Experimental x-ray absorption L-edge spectra of ZnPc, CuPc, NiPc, CoPc, FePc, and MnPc (from top to bottom) recorded at T = 30 K. The shown energy range covers 40 eV for all curves in order to keep constant comparable energy distances.
Experimental photoemission metal 2p of ZnPc, CuPc, NiPc, CoPc, FePc, and MnPc (from top to bottom) recorded at T = 300 K using a monochromatized Al K α source.
Comparison of the experimental and theoretical values for the intensity ratio I ||x, y /I ||z . See text for details.
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