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Title: Spectroscopic, Magnetic, and Computational Investigations on a Series of Rhenium(III) Cyclopentadienide β-diketiminate Halide and Pseudohalide Complexes

Abstract

Here the low-valent rhenium(I) salt Na[Re(η5-Cp)(BDI)] (BDI = N,N'-bis(2,6-diisopropylphenyl)-3,5-dimethyl-β-diketiminate) was shown to react with various halide and chalcogenolate reagents, leading to the isolation of a series of rhenium(III)-halide and -pseudohalide complexes: Re(X)(η5-Cp)(BDI) (1-X, X = F, Cl, Br, I; 2, X = OTf) and Re(ER)(η5-Cp)(BDI) (3-ER, ER = SBn, SeBn, TePh). The 1H NMR spectra of these complexes displayed sharp resonances shifted several ppm from typical diamagnetic regions, as well as distinct chemical shift trends down both the halide (with the exception of F) and chalcogenolate series, with both Cp and BDI backbone peaks moving downfield with increasing atomic number. Subsequent magnetic susceptibility measurements of the rhenium(III) halides 1-Cl, 1-Br, and 1-I indicated that these complexes display temperature-independent paramagnetism (TIP), with χTIPvalues of 7.41(44) × 10-4 to 1.50(51) × 10-3cm3mol-1. Multireference complete active space self-consistent field (CASSCF) computations incorporating spin-orbit state mixing revealed small energy separations (1.7-3.0 kcal/mol) between thermally isolated ground states and the first excited spin-orbit states for the rhenium halides, confirming that low-lying excited states are responsible for the observed TIP behavior.

Authors:
ORCiD logo [1];  [2];  [3]; ORCiD logo [3]; ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [3]; ORCiD logo [1]
  1. University of California, Berkeley, CA (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
  2. University of Toulouse (France)
  3. University of California, Berkeley, CA (United States)
Publication Date:
Research Org.:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division (CSGB); National Science Foundation (NSF); National Institutes of Health (NIH)
OSTI Identifier:
2326974
Grant/Contract Number:  
AC02-05CH11231; CHE-1465188; CHE-1954612; S10OD024998; CHE-1800252
Resource Type:
Accepted Manuscript
Journal Name:
Organometallics
Additional Journal Information:
Journal Volume: 41; Journal Issue: 22; Journal ID: ISSN 0276-7333
Publisher:
American Chemical Society
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Ouellette, Erik T., Amaro Estrada, Jorge Ivan, Lussier, Daniel J., Chakarawet, Khetpakorn, Lohrey, Trevor D., Maron, Laurent, Bergman, Robert G., and Arnold, John. Spectroscopic, Magnetic, and Computational Investigations on a Series of Rhenium(III) Cyclopentadienide β-diketiminate Halide and Pseudohalide Complexes. United States: N. p., 2021. Web. doi:10.1021/acs.organomet.1c00516.
Ouellette, Erik T., Amaro Estrada, Jorge Ivan, Lussier, Daniel J., Chakarawet, Khetpakorn, Lohrey, Trevor D., Maron, Laurent, Bergman, Robert G., & Arnold, John. Spectroscopic, Magnetic, and Computational Investigations on a Series of Rhenium(III) Cyclopentadienide β-diketiminate Halide and Pseudohalide Complexes. United States. https://doi.org/10.1021/acs.organomet.1c00516
Ouellette, Erik T., Amaro Estrada, Jorge Ivan, Lussier, Daniel J., Chakarawet, Khetpakorn, Lohrey, Trevor D., Maron, Laurent, Bergman, Robert G., and Arnold, John. Fri . "Spectroscopic, Magnetic, and Computational Investigations on a Series of Rhenium(III) Cyclopentadienide β-diketiminate Halide and Pseudohalide Complexes". United States. https://doi.org/10.1021/acs.organomet.1c00516. https://www.osti.gov/servlets/purl/2326974.
@article{osti_2326974,
title = {Spectroscopic, Magnetic, and Computational Investigations on a Series of Rhenium(III) Cyclopentadienide β-diketiminate Halide and Pseudohalide Complexes},
author = {Ouellette, Erik T. and Amaro Estrada, Jorge Ivan and Lussier, Daniel J. and Chakarawet, Khetpakorn and Lohrey, Trevor D. and Maron, Laurent and Bergman, Robert G. and Arnold, John},
abstractNote = {Here the low-valent rhenium(I) salt Na[Re(η5-Cp)(BDI)] (BDI = N,N'-bis(2,6-diisopropylphenyl)-3,5-dimethyl-β-diketiminate) was shown to react with various halide and chalcogenolate reagents, leading to the isolation of a series of rhenium(III)-halide and -pseudohalide complexes: Re(X)(η5-Cp)(BDI) (1-X, X = F, Cl, Br, I; 2, X = OTf) and Re(ER)(η5-Cp)(BDI) (3-ER, ER = SBn, SeBn, TePh). The 1H NMR spectra of these complexes displayed sharp resonances shifted several ppm from typical diamagnetic regions, as well as distinct chemical shift trends down both the halide (with the exception of F) and chalcogenolate series, with both Cp and BDI backbone peaks moving downfield with increasing atomic number. Subsequent magnetic susceptibility measurements of the rhenium(III) halides 1-Cl, 1-Br, and 1-I indicated that these complexes display temperature-independent paramagnetism (TIP), with χTIPvalues of 7.41(44) × 10-4 to 1.50(51) × 10-3cm3mol-1. Multireference complete active space self-consistent field (CASSCF) computations incorporating spin-orbit state mixing revealed small energy separations (1.7-3.0 kcal/mol) between thermally isolated ground states and the first excited spin-orbit states for the rhenium halides, confirming that low-lying excited states are responsible for the observed TIP behavior.},
doi = {10.1021/acs.organomet.1c00516},
journal = {Organometallics},
number = 22,
volume = 41,
place = {United States},
year = {Fri Nov 12 00:00:00 EST 2021},
month = {Fri Nov 12 00:00:00 EST 2021}
}

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