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

Journal Article · · CrystEngComm
DOI:https://doi.org/10.1039/c8ce02188k· OSTI ID:1612047
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.
Research Organization:
University of Illinois at Urbana-Champaign, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC); USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0013897
OSTI ID:
1612047
Alternate ID(s):
OSTI ID: 1499059
Journal Information:
CrystEngComm, Journal Name: CrystEngComm Journal Issue: 17 Vol. 21; ISSN CRECF4; ISSN 1466-8033
Publisher:
Royal Society of ChemistryCopyright Statement
Country of Publication:
United States
Language:
English

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