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Electronic structure calculations permit identification of the driving forces behind frequency shifts in transition metal monocarbonyls

Abstract

We report the adiabatic energy decomposition analysis (EDA) of density functional theory (DFT) results, shedding light on the physical content of binding energies and carbon monoxide (CO) frequency (υCO) shifts in select first-row transition metal monocarbonyls (MCOs; M = Ti, V, Cr, Co, Ni, Cu, V, Cr, Mn, Ni, Cu, Zn, Cr+, Mn+, Fe+, Cu+, and Zn+). This approach allows for the direct decomposition of υCO, in contrast to previous studies of these systems. Neutral, anionic, and cationic systems are compared, and our results indicate that the relative importance of electrostatic interactions, intramolecular orbital polarization, and charge transfer can vary significantly with the charge and electron configuration of the metal participating in binding. Various anomalous systems are also discussed and incorporated into a general model of MCO binding. Electrostatic interactions and orbital polarization are found to promote blue shifts in υCO, while charge transfer effects encourage υCO red-shifting; experimentally observed values of υCO are found to be a result of a complex but quantifiable interplay between these physical components. Our computations indicate that CuCO and ZnCO possess triplet ground states, and also that CrCO exhibits a non-linear geometry, all in contrast to previous computational results. Advantages and limitations of this model as an approximation to more complicated systems, like those implicated in heterogeneous catalysis, are discussed. We also report benchmark results for MCO geometries, binding energies, and harmonic CO frequencies, and discuss the validity of single-reference wave function and DFT approaches to the study of these transition metal systems

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Publication details

The article was received on 21 Aug 2019, accepted on 30 Nov 2019 and first published on 03 Dec 2019


Article type: Paper
DOI: 10.1039/C9CP04643G
Phys. Chem. Chem. Phys., 2019, Accepted Manuscript

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    Electronic structure calculations permit identification of the driving forces behind frequency shifts in transition metal monocarbonyls

    E. Rossomme, C. N. Lininger, T. Head-Gordon, A. T. Bell and M. Head-Gordon, Phys. Chem. Chem. Phys., 2019, Accepted Manuscript , DOI: 10.1039/C9CP04643G

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