Document Type


Original Publication Date


Journal/Book/Conference Title

The Journal of Chemical Physics





DOI of Original Publication



Originally published at

Date of Submission

October 2015


The atomic structure, energetics, and properties of gas-phase cluster complexes containing coronene (C24H12) molecule and up to two iron atoms are studied for the first time using density functional theory and generalized gradient approximation for exchange and correlation. The geometries of the neutral and cationic iron–coronene complexes are optimized without symmetry constraint and by examining the possibility that iron atoms could occupy various sites via individual π or bridging interactions. In both neutral and cationic complexes a single Fe atom is found to preferentially occupy the on-top site above the outer ring, while two Fe atoms dimerize and reside on the top of center of the outer rings. The binding energy of neutral Fe2–coronene defined with respect to dissociation into coronene and Fe2 is larger than that of Fe–coronene while reverse is true for the corresponding cations. Although the ionization potentials of these complexes are not very sensitive to the number of adsorbed Fe atoms, they are significantly reduced from those of the Fe atom or the coronene molecule. The photodecomposition of cationic (Fen–coronene)+ complexes proceeds through the ejection of either coronene+ or (Fe–coronene)+ cations while in the case of neutral Fe2–coronene, the ejection of Fe2 is energetically preferred. The coupling between the Fe atoms remains ferromagnetic although the magnetic moment/atom is reduced from the free-atom value. The results compare well with recent mass ion intensity and photofragmentation experiments.


Senapati, L., Nayak, S. K., Rao, B. K., et al. Atomic structure, binding energy, and magnetic properties of iron atoms supported on a polyaromatic hydrocarbon. The Journal of Chemical Physics 118, 8671 (2003). Copyright © 2003 AIP Publishing LLC.

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