Experimental and Theoretical EPR Study of Jahn−Teller-Active [HIPTN[subscript 3]N]MoL Complexes (L = N[subscript 2], CO, NH[subscript 3])
Name
Schrock_Experimental and theoretical.pdf
Size
2.52 MB
Format
Adobe PDF
Checksum (MD5)
84a3b7989b33a692e86fba1201190ee4
Author(s)
McNaughton, Rebecca L.
Roemelt, Michael
Chin, Jia Min
Neese, Frank
Hoffman, Brian M.
Schrock, Richard Royce
Date Issued
April 2010
Journal
Journal of the American Chemical Society
Publisher
American Chemical Society (ACS)
Citation
McNaughton, Rebecca L., Michael Roemelt, Jia Min Chin, Richard R. Schrock, Frank Neese, and Brian M. Hoffman. “Experimental and Theoretical EPR Study of Jahn−Teller-Active [HIPTN3N]MoL Complexes (L = N2, CO, NH3).” Journal of the American Chemical Society 132, no. 25 (June 30, 2010): 8645-8656.
Version
Author's final manuscript
Abstract
The trigonally symmetric Mo(III) coordination compounds [HIPTN[subscript 3]N]MoL (L = N[subscript 2], CO, NH[subscript 3]; [HIPTN3N]Mo = [(3,5-(2,4,6-i-Pr[subscript 3]C[subscript 6]H[subscript 2])[subscript 2]C[subscript 6]H[subscript 3]NCH[subscript 2]CH[subscript 2])[subscript 3]N]Mo) are low-spin d[superscript 3] (S = 1/2) species that exhibit a doubly degenerate [superscript 2]E ground state susceptible to a Jahn−Teller (JT) distortion. The EPR spectra of all three complexes and their temperature and solvent dependences are interpreted within a formal “two-orbital” model that reflects the ground-state configuration, describes the vibronic interactions that lead to the JT distortions, and addresses whether these complexes exhibit static or dynamic JT distortions. The electronic and vibronic properties of these complexes are then analyzed through ab initio quantum chemical computations. It is not possible to interpret the spectroscopic properties of the orbitally degenerate [HIPTN[subscript 3]N]MoL with DFT methods, so we have resorted to multi-reference wavefunction approaches, the entry level of which is the complete active space self-consistent field (CASSCF) method. Overall, the experimental and computational studies provide new insights into the role of trigonal coordination, as enforced by the [HIPTN[subscript 3]N][superscript 3−] ligand, in activating the Mo ion for the binding and reduction of N[subscript 2].
MIT Department
Massachusetts Institute of Technology. Department of Chemistry
Terms of Use
Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1021/ja1004619
