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Synthesis and Characterization of Cobalt NCN Pincer Complexes

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(NCN(CH2)−Et)Br] (1) was accomplished by transmetalation of Li[2,6‐(Et(2)NCH(2))(2)C(6)H(3)] with CoBr(2) in THF. Treatment of t...

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Autores principales: Pecak, Jan, Eder, Wolfgang, Tomsu, Gerald, Stöger, Berthold, Pignitter, Marc, Kirchner, Karl
Formato: Online Artículo Texto
Lenguaje:English
Publicado: John Wiley and Sons Inc. 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8596404/
https://www.ncbi.nlm.nih.gov/pubmed/34819799
http://dx.doi.org/10.1002/ejic.202100643
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author Pecak, Jan
Eder, Wolfgang
Tomsu, Gerald
Stöger, Berthold
Pignitter, Marc
Kirchner, Karl
author_facet Pecak, Jan
Eder, Wolfgang
Tomsu, Gerald
Stöger, Berthold
Pignitter, Marc
Kirchner, Karl
author_sort Pecak, Jan
collection PubMed
description 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(NCN(CH2)−Et)Br] (1) was accomplished by transmetalation of Li[2,6‐(Et(2)NCH(2))(2)C(6)H(3)] with CoBr(2) in THF. Treatment of this air‐sensitive compound with NO gas resulted in the formation of the diamagnetic Co(III) species [Co(NCN(CH2)−Et)(NO)Br] (2) as confirmed by X‐ray diffraction. This complex features a strongly bent NO ligand (Co−N−O∠135.0°). The ν(NO) 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 CuBr(2) led to the formation of the Co(III) complex [Co(NCN(CH2)−Et)Br(2)]. Treatment of [Co(NCN(CH2)−Et)Br(2)] with TlBF(4) as halide scavenger in acetonitrile led to the formation of the cationic octahedral complex [Co(NCN(CH2)−Et)(MeCN)(3)](BF(4))(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.
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spelling pubmed-85964042021-11-22 Synthesis and Characterization of Cobalt NCN Pincer Complexes Pecak, Jan Eder, Wolfgang Tomsu, Gerald Stöger, Berthold Pignitter, Marc Kirchner, Karl Eur J Inorg Chem Full Papers 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(NCN(CH2)−Et)Br] (1) was accomplished by transmetalation of Li[2,6‐(Et(2)NCH(2))(2)C(6)H(3)] with CoBr(2) in THF. Treatment of this air‐sensitive compound with NO gas resulted in the formation of the diamagnetic Co(III) species [Co(NCN(CH2)−Et)(NO)Br] (2) as confirmed by X‐ray diffraction. This complex features a strongly bent NO ligand (Co−N−O∠135.0°). The ν(NO) 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 CuBr(2) led to the formation of the Co(III) complex [Co(NCN(CH2)−Et)Br(2)]. Treatment of [Co(NCN(CH2)−Et)Br(2)] with TlBF(4) as halide scavenger in acetonitrile led to the formation of the cationic octahedral complex [Co(NCN(CH2)−Et)(MeCN)(3)](BF(4))(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. John Wiley and Sons Inc. 2021-10-11 2021-11-08 /pmc/articles/PMC8596404/ /pubmed/34819799 http://dx.doi.org/10.1002/ejic.202100643 Text en © 2021 The Authors. European Journal of Inorganic Chemistry published by Wiley-VCH GmbH https://creativecommons.org/licenses/by/4.0/This is an open access article under the terms of the http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
spellingShingle Full Papers
Pecak, Jan
Eder, Wolfgang
Tomsu, Gerald
Stöger, Berthold
Pignitter, Marc
Kirchner, Karl
Synthesis and Characterization of Cobalt NCN Pincer Complexes
title Synthesis and Characterization of Cobalt NCN Pincer Complexes
title_full Synthesis and Characterization of Cobalt NCN Pincer Complexes
title_fullStr Synthesis and Characterization of Cobalt NCN Pincer Complexes
title_full_unstemmed Synthesis and Characterization of Cobalt NCN Pincer Complexes
title_short Synthesis and Characterization of Cobalt NCN Pincer Complexes
title_sort synthesis and characterization of cobalt ncn pincer complexes
topic Full Papers
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8596404/
https://www.ncbi.nlm.nih.gov/pubmed/34819799
http://dx.doi.org/10.1002/ejic.202100643
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