Electronic structure and bonding in metal phthalocyanines, Metal=Fe, Co, Ni, Cu, Zn, Mg
2001/06/08 by Meng-Sheng Liao, Meng‐Sheng Liao, Steve Scheiner · 31 citations
Chemistry · Energy · Engineering · Materials Science · #Chemistry #Computational chemistry #Crystallography #Electrocatalysts for Energy Conversion #Electron #Electronic structure #HOMO/LUMO #Inorganic chemistry #Ion #Ionization #Ionization energy #Materials science #Metal #Molecule #Organic chemistry #Photochemistry #Phthalocyanine #Porphyrin and Phthalocyanine Chemistry #Ring (chemistry) #Surface Chemistry and Catalysis #Valence (chemistry) #Valence electron #Zinc
paper · doi:10.1063/1.1367374
openalex publication_date 2001/06/08 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Abstract
Electronic structure and bonding in metal phthalocyanines (Metal=Fe, Co, Ni, Cu, Zn, Mg) is investigated in detail using a density functional method. The metal atoms are strongly bound to the phthalocyanine ring in each case, by as much as 10 eV. The calculated orbital energy levels and relative total energies of these D4h structures indicate that Fe and Co phthalocyanines have A2g3 and Eg2 ground states, respectively, but that these states are changed upon interaction with strong-field axial ligands. The valence electronic structures of Fe and Co phthalocyanines differ significantly from those of the others. The HOMOs in Fe, Co, and Cu phthalocyanine are metal 3d-like, whereas in Ni and Zn phthalocyanines, the HOMO is localized on the phthalocyanine ring. The first ionization removes an electron from the phthalocyanine a1u orbital in all cases, with very little sensitivity of the ionization energy to the identity of the metal. Whereas the first reduction in Fe and Co phthalocyanine occurs at the metal, it is the phthalocyanine that is reduced upon addition of an electron to the other systems. Fe, Ni, and Cu phthalocyanines have smaller HOMO–LUMO separations than do Zn and Co phthalocyanine. There is very little variation in atomic charges within the phthalocyanine from one metal to the next.
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