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Issue 21, 2012
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A B3LYP-DBLOC empirical correction scheme for ligand removal enthalpies of transition metal complexes: parameterization against experimental and CCSD(T)-F12 heats of formation

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Abstract

Average ligand removal enthalpies of 30 differently coordinated mono-nuclear fourth-row transition metal complexes taken from a database recently considered by Johnson and Becke [Can. J. Chem., 2009, 8, 1369] have been computed in the gas phase using unrestricted pseudo-spectral (LACV3P) and fully analytic (qzvp(-g)) B3LYP including a recently developed empirical dispersion correction. Heats of formation of neutral singlet reactants and neutral, potentially high spin, products have been taken from NIST's Organometallic Thermochemistry Database. Comparison of B3LYP-MM//qzvp(-g) and experimental average ligand removal enthalpies reveals a systematic error in the reported experimental enthalpies for manganese-containing complexes which is verified with high-level, CCSD(T)-F12//family of cc-pVTZ, explicitly correlated coupled-cluster methods. Other B3LYP-MM//qzvp(-g) error patterns give rise to a d-block localized orbital correction (DBLOC) scheme containing six transferable parameters that correct the functional's description of metal–ligand bonding, cation-π, and dispersion interactions as well as metal and/or ligand multi-reference effects. Metal–ligand cation-π and dispersion interactions have been fit to the monopole/induced-dipole, Image ID:c2cp40220c-t1.gif, and induced-dipole/induced-dipole, Image ID:c2cp40220c-t2.gif, interaction functions, respectively. This DBLOC model has been built upon a previously determined set of metal atom parameters which are necessary to properly describe the free metal atom reaction products. The final DBLOC model brings the mean unsigned error of B3LYP-MM//qzvp(-g) from 3.74 ± 3.51 kcal/mol to 0.94 ± 0.68 kcal/mol and corrects the functional's under binding in nearly every case. Several important connections among DBLOC parameters have been made.

Graphical abstract: A B3LYP-DBLOC empirical correction scheme for ligand removal enthalpies of transition metal complexes: parameterization against experimental and CCSD(T)-F12 heats of formation

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Publication details

The article was received on 22 Jan 2012, accepted on 19 Mar 2012 and first published on 18 Apr 2012


Article type: Paper
DOI: 10.1039/C2CP40220C
Citation: Phys. Chem. Chem. Phys., 2012,14, 7724-7738
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    A B3LYP-DBLOC empirical correction scheme for ligand removal enthalpies of transition metal complexes: parameterization against experimental and CCSD(T)-F12 heats of formation

    T. F. Hughes, J. N. Harvey and R. A. Friesner, Phys. Chem. Chem. Phys., 2012, 14, 7724
    DOI: 10.1039/C2CP40220C

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