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  Covalency and chemical bonding in transition metal complexes: An ab initio based ligand field perspective

Singh, S. K., Eng, J., Atanasov, M., & Neese, F. (2017). Covalency and chemical bonding in transition metal complexes: An ab initio based ligand field perspective. Coordination Chemistry Reviews, 344(8), 2-25. doi:10.1016/j.ccr.2017.03.018.

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 Creators:
Singh, Saurabh Kumar1, Author           
Eng, Julien1, 2, Author           
Atanasov, Mihail1, 3, Author           
Neese, Frank1, Author           
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1Research Department Neese, Max Planck Institute for Chemical Energy Conversion, Max Planck Society, ou_3023886              
2School of Chemistry, Newcastle University, Newcastle upon Tyne NE1 7RU, UK, ou_persistent22              
3Institute of General and Inorganic Chemistry, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria, ou_persistent22              

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 Abstract: In this work, a general, user-friendly method – ab initio ligand field theory (AILFT), is described and illustrated. AILFT allows one to unambiguously extract all ligand field parameters (the ligand field one-electron matrix VLFT, the Racah parameters B and C, and the spin-orbit coupling parameter ζ) from relatively straightforward multi-reference ab initio calculations. The method applies to mononuclear complexes in dn or fn configurations. The method is illustrated using complete active space self-consistent field (CASSCF) and N-electron valence perturbation theory (NEVPT2) calculations on a series of well documented octahedral complexes of CrIII with simple ligands such as F, Cl, Br, I, NH3 and CN. It is shown that all well-known trends for the value of 10Dq (the spectrochemical series) are faithfully reproduced by AILFT. By comparison of B and ζ for CrIII in these complexes with the parameters calculated for the free ion Cr3+, the covalency of the Cr-ligand bond can be assessed quantitatively (the non-relativistic and relativistic nephelauxetic effects). The variation of ligand field parameters for complexes of 3d, 4d and 5d elements is studied using MCl63− (M = CrIII, MoIII, WIII) as model examples. As reflected in variations of 10Dq, B and ζ across this series, metal-ligand covalency increases from CrCl63− to MoCl63− to WCl63−. Using the angular overlap model, the one-electron parameters of the ligand field matrix are decomposed into increments for σ- and π- metal-ligand interactions. This allows for the quantification of variations in σ- and π-ligand donor properties of these ligands. Using these results, the well documented two-dimensional spectroscopic series for complexes of CrIII is quantitatively reproduced. Comparison of the results obtained using CASSCF and NEVPT2 reveals the importance of dynamic electron correlation. Finally, the limitations of the AILFT method for complexes with increasing metal-ligand covalency are analyzed and discussed.

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Language(s): eng - English
 Dates: 2017-02-032017-03-312017-08-01
 Publication Status: Published in print
 Pages: 23
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1016/j.ccr.2017.03.018
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Title: Coordination Chemistry Reviews
  Abbreviation : Coord. Chem. Rev.
Source Genre: Journal
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Publ. Info: Amsterdam : Elsevier
Pages: - Volume / Issue: 344 (8) Sequence Number: - Start / End Page: 2 - 25 Identifier: ISSN: 0010-8545
CoNE: https://pure.mpg.de/cone/journals/resource/954925393339