Preprint Article Version 1 This version is not peer-reviewed

A comparative study of energetics of ferrocenium and ferrocene

Version 1 : Received: 8 August 2018 / Approved: 8 August 2018 / Online: 8 August 2018 (11:16:59 CEST)

How to cite: Islam, S.; Wang, F. A comparative study of energetics of ferrocenium and ferrocene. Preprints 2018, 2018080166 (doi: 10.20944/preprints201808.0166.v1). Islam, S.; Wang, F. A comparative study of energetics of ferrocenium and ferrocene. Preprints 2018, 2018080166 (doi: 10.20944/preprints201808.0166.v1).

Abstract

Ferrocenium (Fc+) inherits a number of molecular/electronic properties from the neutral counterparts’ ferrocene (Fc) including the high symmetry. Both Fc+ and Fc prefer the eclipsed structure (D5h) over the staggered structure (D5d) by an energy of 0.36 kcal·mol-1. The present study using the recently developed excess orbital energy spectrum (EOES) shows that the open shell Fc+ cation exhibits similar conformer dependent configurational changes to the neutral Fc conformer pair. A further energy decomposition analysis (EDA) discloses that the reasons for the preferred structures are different between Fc+ and Fc. The dominant differentiating energy between the Fc+ conformers is the electrostatic energy (EEstat), whereas in neutral Fc, it is the quantum mechanical Pauli repulsive energy (EPauli). Within the D5h conformer of Fc+, the EOES reveals that the -electrons of Fc+ experience more substantial conformer dependent energy changes than the -electrons (assumed the hole is in a β orbital).

Subject Areas

Ferrocenium conformers, electron structure of organometallic complexes, excess orbital energy spectrum (EOES), α- and β-electrons of Fc+, energy decomposition analysis (EDA).

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