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A unique copper coordination structure with both mono- and bi-dentate ethylenediamine ligands

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Abstract

The compound (ethylenediamine-N)-bis(ethylenediamine-N,N′)-copper(II) bis(nitrate) is reported. It has an asymmetric unit containing Cu(II) penta-coordinating to two chelating ethylenediamine (en) and one monodentate en ligands with square-pyramidal-based geometry having severe trigonal distortion, together with two nitrate anions. It is the first crystallographic confirmation of the existence of penta-coordination with exclusively en ligands for any metal center, as well as the first monodentate en attached to Cu(II) seen in the solid state. It can be visualized as the penta-ammine effect realized solely with bi-amine ligands, defying the presumed necessity of mono-amines. X-ray crystallography establishes it to have P21/c space group with a = 12.83 Å, b = 9.77 Å, c = 11.91 Å, and β = 94.8° (at 100 K). Spectroscopic analysis of this compound is consistent with the crystallographic assessment of the coordination chemistry, and it is found to be a S = 1/2 paramagnet.

Graphical abstract: A unique copper coordination structure with both mono- and bi-dentate ethylenediamine ligands

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Publication details

The article was received on 29 Dec 2018, accepted on 28 Feb 2019 and first published on 01 Mar 2019


Article type: Paper
DOI: 10.1039/C8CE02188K
Citation: CrystEngComm, 2019, Advance Article

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    A unique copper coordination structure with both mono- and bi-dentate ethylenediamine ligands

    J. Sharma, Z. Jiang, A. Bhutani, P. Behera and D. P. Shoemaker, CrystEngComm, 2019, Advance Article , DOI: 10.1039/C8CE02188K

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