Universität zu Köln

Mohammadnezhad, Gholamhossein ORCID: 0000-0003-1765-8063, Amirian, Ali Mohammad, Goerls, Helmar, Plass, Winfried, Sandleben, Aaron ORCID: 0000-0002-4141-7406, Schaefer, Sascha ORCID: 0000-0001-6035-1281 and Klein, Axel ORCID: 0000-0003-0093-9619 (2021). Redox Instability of Copper(II) Complexes of a Triazine-Based PNP Pincer. Eur. J. Inorg. Chem., 2021 (12). S. 1140 - 1152. WEINHEIM: WILEY-V C H VERLAG GMBH. ISSN 1099-0682

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Abstract

The new Cu(I) complex [Cu(PNPNTPh-Ph)Cl] (1) containing the tridentate PNP pincer ligand N,N '-bis(diphenylphosphino)-2,6-diamino-4-phenyl-1,3,5-triazine was obtained from the reaction of [Cu(SMe2)Cl](n) with the ligand as ether solvate 1(.)0.5Et(2)O. 1 was independently obtained from a reaction mixture containing the ligand and the Cu(II) precursor CuCl(2)(.)2H(2)O in 50 % yield alongside with the Cu(II) coordination polymer [Cu(O2PPh2)(2)](n) (2). From the reaction of Cu(NO3)(2) . 3H(2)O with PNPNTPh-Ph in the presence of pyridine the complexes [Cu(O2PPh2)(2)(Py)(2)(H2O)] (3), [Cu(O2PPh2)(Py)(2)(NO3)](2) (4), and [Cu(Py)(4)(NO3)(2)]Py-. (5), were obtained, 2, 3, and 4 contain diphenyl-phosphinate ligands. The underlying redox reaction of the ligand and Cu(II) yielding the oxidised ligands observed in the by-products and the Cu(I) product complex was further studied using electrochemistry and UV-vis spectroelectrochemistry. Attempts to synthesise the Cu(II) complex [Cu(PNPNTPh-Ph)(NO3)(2)] (6) in a mechanochemical experiment gave evidence for this unprecedented species from ESI-MS(+) and EPR spectroscopy but also revealed its very high sensitivity to air and moisture. The catalytic activity of 1 was investigated in the azide-alkyne cycloaddition yielding various 1-benzyl-4-phenyl-1H-1,2,3-triazoles. The environmentally benign (green) and cheap EtOH/H2O solvent mixture turned out to be very suitable. Melting points, FT-IR, and NMR spectra of the triazole products were analysed.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Mohammadnezhad, Gholamhossein UNSPECIFIED orcid.org/0000-0003-1765-8063 UNSPECIFIED Amirian, Ali Mohammad UNSPECIFIED UNSPECIFIED UNSPECIFIED Goerls, Helmar UNSPECIFIED UNSPECIFIED UNSPECIFIED Plass, Winfried UNSPECIFIED UNSPECIFIED UNSPECIFIED Sandleben, Aaron UNSPECIFIED orcid.org/0000-0002-4141-7406 UNSPECIFIED Schaefer, Sascha UNSPECIFIED orcid.org/0000-0001-6035-1281 UNSPECIFIED Klein, Axel UNSPECIFIED orcid.org/0000-0003-0093-9619 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-586107
DOI:	10.1002/ejic.202001129
Journal or Publication Title:	Eur. J. Inorg. Chem.
Volume:	2021
Number:	12
Page Range:	S. 1140 - 1152
Date:	2021
Publisher:	WILEY-V C H VERLAG GMBH
Place of Publication:	WEINHEIM
ISSN:	1099-0682
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language Chemistry, Inorganic & Nuclear Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/58610