Synthesis and Characterization of Cobalt NCN Pincer Complexes
© 2021 The Authors. European Journal of Inorganic Chemistry published by Wiley-VCH GmbH.
| Veröffentlicht in: | European journal of inorganic chemistry. - 1998. - 2021(2021), 41 vom: 08. Nov., Seite 4280-4285 |
|---|---|
| 1. Verfasser: | |
| Weitere Verfasser: | , , , , |
| Format: | Online-Aufsatz |
| Sprache: | English |
| Veröffentlicht: |
2021
|
| Zugriff auf das übergeordnete Werk: | European journal of inorganic chemistry |
| Schlagworte: | Journal Article Cobalt DFT studies EPR studies Nitrosyl ligand Pincer complexes |
| Zusammenfassung: | © 2021 The Authors. European Journal of Inorganic Chemistry published by Wiley-VCH GmbH. A series of cobalt complexes, stabilized by a monoanionic tridentate NCN pincer ligand, was synthetized and characterized. Preparation of the paramagnetic 15 VE complex [Co(NCNCH2-Et)Br] (1) was accomplished by transmetalation of Li[2,6-(Et2NCH2)2C6H3] with CoBr2 in THF. Treatment of this air-sensitive compound with NO gas resulted in the formation of the diamagnetic Co(III) species [Co(NCNCH2-Et)(NO)Br] (2) as confirmed by X-ray diffraction. This complex features a strongly bent NO ligand (Co-N-O∠135.0°). The νNO is observed at 1609 cm-1 which is typical for a bent metal-N-O arrangement. Coordinatively unsaturated 1 could further be treated with pyridine, isocyanides, phosphines and CO to form five-coordinate 17 VE complexes. Oxidation of 1 with CuBr2 led to the formation of the Co(III) complex [Co(NCNCH2-Et)Br2]. Treatment of [Co(NCNCH2-Et)Br2] with TlBF4 as halide scavenger in acetonitrile led to the formation of the cationic octahedral complex [Co(NCNCH2-Et)(MeCN)3](BF4)2. A combination of X-ray crystallography, IR-, NMR- and EPR-spectroscopy as well as DFT/CAS-SCF calculations were used to characterize all compounds |
|---|---|
| Beschreibung: | Date Revised 07.04.2024 published: Print-Electronic Citation Status PubMed-not-MEDLINE |
| ISSN: | 1434-1948 |
| DOI: | 10.1002/ejic.202100643 |