A1 Journal article (refereed)
Oxygen Transfer from Trimethylamine N-oxide to CuI Complexes Supported by Pentanitrogen Ligands (2020)


Ramírez, Erick; Hossain, Kamal; Flores-Alamo, Marcos; Haukka, Matti; Nordlander, Ebbe; Castillo, Ivan (2020). Oxygen Transfer from Trimethylamine N-oxide to CuI Complexes Supported by Pentanitrogen Ligands. European Journal of Inorganic Chemistry, 2020 (29), 2798-2808. DOI: 10.1002/ejic.202000488


JYU authors or editors


Publication details

All authors or editors: Ramírez, Erick; Hossain, Kamal; Flores-Alamo, Marcos; Haukka, Matti; Nordlander, Ebbe; Castillo, Ivan

Journal or series: European Journal of Inorganic Chemistry

ISSN: 1434-1948

eISSN: 1099-0682

Publication year: 2020

Volume: 2020

Issue number: 29

Pages range: 2798-2808

Publisher: Wiley-VCH Verlag

Publication country: Germany

Publication language: English

DOI: http://doi.org/10.1002/ejic.202000488

Open Access: Publication channel is not openly available

Publication is parallel published (JYX): https://jyx.jyu.fi/handle/123456789/71050


Abstract

[N,N-bis(1-methyl-2-benzimidazolyl)methyl-N-(bis-2-pyridylmethyl)amine] ( L 1 ) and [N,N-bis(2-quinolylmethyl)-N-bis(2-pyridyl)methylamine] ( L 2 ) were employed to prepare Cu II  and Cu I  complexes for spectroscopic and structural characterization. [ L 1 Cu II (H 2 O)](NO 3 ) 2 and [ L 2 Cu II (NO 3 )]NO 3 have Jahn-Teller distorted octahedral geometries, and give rise to isotropic EPR spectra in frozen solution. [ L 1 Cu I (CH 3 CN)]OTf and [ L 2 Cu I (CH 3 CN)]OTf have distorted trigonal bipyramidal and tetrahedral solid-state structures, respectively. The N-donors display labile behavior in solution, based on variable-temperature 1 H NMR studies. Addition of trimethylamine N-oxide (Me 3 NO) to solutions of [ L 1 Cu I (CH 3 CN)]OTf and [ L 2 Cu I (CH 3 CN)]OTf resulted in diamagnetic species tentatively assigned as the corresponding adducts upon replacement of coordinated acetonitrile, based on 1 H NMR spectroscopy. Heating [ L 1 Cu I (CH 3 CN)]OTf to 50-60 °C in the presence of Me 3 NO resulted in its cupric analogue [ L 1 Cu II (CH 3 CN)] 2+ , as well as a small amount of 2-dipyridylketone, along with other oxidation byproducts. In the case of [ L 2 Cu I (CH 3 CN)]OTf, the reaction with Me 3 NO resulted in the cupric complex bis(2-quinolinecarboxamidato)copper(II), along with 2-dipyridylketone as oxidation products.


Keywords: coordination complexes; copper; ligands; oxidation (active)

Free keywords: copper; oxido transfer; nitrogen ligands; C-H activation; oxidation


Contributing organizations


Ministry reporting: Yes


Last updated on 2020-18-08 at 13:13