Molecular and electronic structure of Re2Br4(PMe3)4
Abstract
The dinuclear rhenium(II) complex Re2Br4(PMe3)4 was prepared from the reduction of [Re2Br8]2– with (n-Bu4N)BH4 in the presence of PMe3 in propanol. The complex was characterized by single-crystal X-ray diffraction (SCXRD) and UV–visible spectroscopy. It crystallizes in the monoclinic C2/c space group and is isostructural with its molybdenum and technetium analogues. The Re–Re distance (2.2521(3) Å) is slightly longer than the one in Re2Cl4(PMe3)4 (2.247(1) Å). The molecular and electronic structure of Re2X4(PMe3)4 (X = Cl, Br) were studied by multiconfigurational quantum chemical methods. The computed ground-state geometry is in excellent agreement with the experimental structure determined by SCXRD. The calculated total bond order (2.75) is consistent with the presence of an electron-rich triple bond and is similar to the one found for Re2Cl4(PMe3)4. The electronic absorption spectrum of Re2Br4(PMe3)4 was recorded in benzene and shows a series of low-intensity bands in the range 10 000–26 000 cm–1. The absorption bands were assigned based on calculations of the excitation energies with the multireference wave functions followed by second-order perturbation theory using the CASSCF/CASPT2 method. As a result, calculations predict that the lowest energy band corresponds to the δ* → σ* transition, while the next higher energy bands were attributed to themore »
- Authors:
-
- Univ. of Nevada, Las Vegas, NV (United States)
- College de France, Paris Cedex (France)
- Uppsala Univ., Uppsala (Sweden)
- Univ. of Nevada, Las Vegas, NV (United States); Argonne National Lab. (ANL), Argonne, IL (United States)
- Publication Date:
- Research Org.:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Org.:
- Swedish Research Council (SRC); Uppsala University; Knut and Alice Wallenberg Foundation; USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1339564
- Grant/Contract Number:
- AC02-06CH11357
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Inorganic Chemistry
- Additional Journal Information:
- Journal Volume: 55; Journal Issue: 14; Journal ID: ISSN 0020-1669
- Publisher:
- American Chemical Society (ACS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; Rhenium; DFT; electronic structure; metal-metal bonds; single crystal X-ray diffraction
Citation Formats
Johnstone, Erik V., Poineau, Frederic, Todorova, Tanya K., Forster, Paul M., Sorensen, Lasse K., Fdez. Galvan, Ignacio, Lindh, Roland, Czerwinski, Kenneth R., and Sattelberger, Alfred P. Molecular and electronic structure of Re2Br4(PMe3)4. United States: N. p., 2016.
Web. doi:10.1021/acs.inorgchem.6b01052.
Johnstone, Erik V., Poineau, Frederic, Todorova, Tanya K., Forster, Paul M., Sorensen, Lasse K., Fdez. Galvan, Ignacio, Lindh, Roland, Czerwinski, Kenneth R., & Sattelberger, Alfred P. Molecular and electronic structure of Re2Br4(PMe3)4. United States. https://doi.org/10.1021/acs.inorgchem.6b01052
Johnstone, Erik V., Poineau, Frederic, Todorova, Tanya K., Forster, Paul M., Sorensen, Lasse K., Fdez. Galvan, Ignacio, Lindh, Roland, Czerwinski, Kenneth R., and Sattelberger, Alfred P. Thu .
"Molecular and electronic structure of Re2Br4(PMe3)4". United States. https://doi.org/10.1021/acs.inorgchem.6b01052. https://www.osti.gov/servlets/purl/1339564.
@article{osti_1339564,
title = {Molecular and electronic structure of Re2Br4(PMe3)4},
author = {Johnstone, Erik V. and Poineau, Frederic and Todorova, Tanya K. and Forster, Paul M. and Sorensen, Lasse K. and Fdez. Galvan, Ignacio and Lindh, Roland and Czerwinski, Kenneth R. and Sattelberger, Alfred P.},
abstractNote = {The dinuclear rhenium(II) complex Re2Br4(PMe3)4 was prepared from the reduction of [Re2Br8]2– with (n-Bu4N)BH4 in the presence of PMe3 in propanol. The complex was characterized by single-crystal X-ray diffraction (SCXRD) and UV–visible spectroscopy. It crystallizes in the monoclinic C2/c space group and is isostructural with its molybdenum and technetium analogues. The Re–Re distance (2.2521(3) Å) is slightly longer than the one in Re2Cl4(PMe3)4 (2.247(1) Å). The molecular and electronic structure of Re2X4(PMe3)4 (X = Cl, Br) were studied by multiconfigurational quantum chemical methods. The computed ground-state geometry is in excellent agreement with the experimental structure determined by SCXRD. The calculated total bond order (2.75) is consistent with the presence of an electron-rich triple bond and is similar to the one found for Re2Cl4(PMe3)4. The electronic absorption spectrum of Re2Br4(PMe3)4 was recorded in benzene and shows a series of low-intensity bands in the range 10 000–26 000 cm–1. The absorption bands were assigned based on calculations of the excitation energies with the multireference wave functions followed by second-order perturbation theory using the CASSCF/CASPT2 method. As a result, calculations predict that the lowest energy band corresponds to the δ* → σ* transition, while the next higher energy bands were attributed to the δ* → π*, δ → σ*, and δ → π* transitions.},
doi = {10.1021/acs.inorgchem.6b01052},
journal = {Inorganic Chemistry},
number = 14,
volume = 55,
place = {United States},
year = {Thu Jul 07 00:00:00 EDT 2016},
month = {Thu Jul 07 00:00:00 EDT 2016}
}
Web of Science
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