Journal article
Spectroscopic and Theoretical Studies of Ruthenium Complexes with a Noninnocent N 2 S 2 Ligand in Different Redox States
Inorganic chemistry, Vol.64(31), pp.15961-15979
07/26/2025
DOI: 10.1021/acs.inorgchem.5c02059
Appears in UI Libraries Support Open Access
Abstract
Herein we report an electronic structure investigation of neutral and oxidized Ru complexes containing a redox noninnocent N2S2 ligand derived from o-phenylenediamide (L1). UV–vis spectroelectrochemistry (SEC) studies were conducted on the square pyramidal complex [RuII(L1)(PPh3)] (1) and the six-coordinate complexes [RuII(μ-BH3)(L1)(PPh3)] (2) – which has BH3 bound in a metal–ligand cooperative (MLC) fashion across Ru and L1 – and [RuII(L1)(PPh3)(MeCN)] (3). The SEC results yielded spectra assigned to singly and doubly oxidized 1 and 3, revealing electronic structure changes as a function of oxidation state and in response to the presence and absence of bound MeCN. By contrast, the SEC results of 2 showed that it rapidly loses MLC-bound BH3 upon oxidation. The SEC results for 1 and 3 were compared to single-crystal XRD data and UV–vis, EPR, and P K-edge, S K-edge, and Ru L3-edge X-ray absorption spectroscopy (XAS) data collected on isolated samples of chemically oxidized 3. The data revealed that the first two oxidations are primarily localized on the ligand, which was supported by DFT and TDDFT calculations. DFT calculations for the doubly oxidized species revealed a singlet ground state with a singlet–triplet gap of 8.9 kcal/mol. CASPT2 calculations corroborated the DFT calculations and further revealed that the singlet ground state is multiconfigurational with 21% radical character. Collectively, the results establish redox formalisms and the underlying electronic structure of Ru complexes containing a noninnocent tetradentate ligand in different oxidation states.
Details
- Title: Subtitle
- Spectroscopic and Theoretical Studies of Ruthenium Complexes with a Noninnocent N 2 S 2 Ligand in Different Redox States
- Creators
- Javier A. Luna - University of IowaKyle D. Spielvogel - University of IowaNathan R. Loutsch - University of IowaSydney M. Loria - Colgate UniversityLeah P. Weisburn - Colgate UniversityMark R. Ringenberg - University of StuttgartBess Vlaisavljevich - University of IowaJason M. Keith - Colgate UniversityScott K. Shaw - University of IowaScott R. Daly - University of Iowa
- Resource Type
- Journal article
- Publication Details
- Inorganic chemistry, Vol.64(31), pp.15961-15979
- DOI
- 10.1021/acs.inorgchem.5c02059
- ISSN
- 0020-1669
- eISSN
- 1520-510X
- Publisher
- American Chemical Society
- Copyright
- Copyright © 2025 The Authors
- Grant note
- Division of Chemistry: CHE-1650894, CHE-1651381 National Science Foundation: DE-AC02-76SF00515 U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences
This work was generously supported by the National Science Foundation (CHE-1650894 and CHE-1651381). We thank Dale Swenson for collecting the single-crystal XRD data and Erik Nelson, Matthew Latimer, and Cynthia Patty for their assistance collecting XAS data at the Stanford Synchrotron Radiation Lightsource. Use of the Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, is supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences under Contract No. DE-AC02-76SF00515.
- Language
- English
- Date published
- 07/26/2025
- Academic Unit
- Chemistry
- Record Identifier
- 9984927087402771
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