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Unsaturated trinuclear iron fluoroborylene complexes.
Journal of Molecular Modeling 2017 April
The unsaturated trinuclear iron fluoroborylene complexes Fe3 (BF)3 (CO)n (n = 7, 6) have been studied using density functional theory (DFT). Relatively complicated potential energy surfaces are found with nine and eight structures within 15 kcal mol-1 of the lowest energy structures for the Fe3 (BF)3 (CO)7 and Fe3 (BF)3 (CO)6 systems, respectively. In each of these low-energy structures all three BF groups are either edge-bridging or face-bridging but never terminal groups. Some, but not all, of the low-energy structures also have edge-bridging and/or face-bridging CO groups leading to some structures with as many as five bridging groups. The relatively narrow range of Fe-Fe distances in the central Fe3 triangles of the Fe3 (BF)3 (CO)n (n = 7, 6) structures, mainly between 2.37 and 2.55 Å, suggests considerable delocalization in these unsaturated systems. Graphical Abstract The lowest energy Fe3 (BF)3 (CO)7 and Fe3 (BF)3 (CO)6 structures have a face-bridging μ3 -BF group with the two remaining BF groups bridging edges. The lowest energy Fe3 (BF)3 (CO)6 structure also has one four-electron donor bridging η2 -μ-CO group.
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