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- W2063033178 abstract "The interaction of two iron atoms with molecular nitrogen was studied by means of density functional techniques. Calculations were of the all-electron type, and both conventional local and gradient-dependent approximate (GDA) models were used. A ground state (GS) of linear structure was found for Fe2-N2 with 2S + 1 = 7; whereas a distorted tetrahedral structure, being also a septuplet, was located at 4.0 and 14.3 kcal/mol above the GS, at the local and GDA levels of theory, respectively. The N-N bond is moderately perturbed in the GS, but it is strongly activated in the tetrahedral mode: It has bond orders of 2.6 and 1.5, vibrational frequencies of 2148 and 1496 cm-1, and equilibrium bond lengths of 1.14 and 1.24 Å, for the linear and tetrahedral geometries, respectively. These values are 3.0, 2359 cm-1, and 1.095 Å, for free N2. At GDA level of theory, the Fe2-N2 binding energy is 15 kcal/mol, which is bigger than that of Fe-N2 (9 kcal/mol). The π-back donation, in the linear GS, is of 0.31 electrons, but the total charge transfer, from Fe2 to N2, is only 0.05 units. This is relevant in comparison with the tetrahedral mode, where the Fe2 to N2 total charge transfer is of 0.45 electrons, yielding a stronger activated N2 moiety. © 1996 John Wiley & Sons, Inc." @default.
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- W2063033178 date "1996-01-01" @default.
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- W2063033178 title "Density functional study of Fe2 ?N2" @default.
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- W2063033178 doi "https://doi.org/10.1002/(sici)1097-461x(1996)60:7<1419::aid-qua24>3.0.co;2-y" @default.
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