Journal article
S. Ferrara, J. Mague, J. P. Donahue
Acta crystallographica. Section E, Structure reports online, 2010
Acta crystallographica. Section E, Structure reports online, 2010
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APA
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Ferrara, S., Mague, J., & Donahue, J. P. (2010). trans-Bis(N,N-diethylethylenediamine)nickel(II) dibromide. Acta Crystallographica. Section E, Structure Reports Online.
Chicago/Turabian
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Ferrara, S., J. Mague, and J. P. Donahue. “Trans-Bis(N,N-Diethylethylenediamine)Nickel(II) Dibromide.” Acta crystallographica. Section E, Structure reports online (2010).
MLA
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Ferrara, S., et al. “Trans-Bis(N,N-Diethylethylenediamine)Nickel(II) Dibromide.” Acta Crystallographica. Section E, Structure Reports Online, 2010.
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@article{s2010a,
title = {trans-Bis(N,N-diethylethylenediamine)nickel(II) dibromide},
year = {2010},
journal = {Acta crystallographica. Section E, Structure reports online},
author = {Ferrara, S. and Mague, J. and Donahue, J. P.}
}
Abstract
The structure of the title compound, [Ni(C6H16N2)2]Br2 or [Ni(Et2en)2]Br2 (Et2en is asymmetric N,N-diethylethylenediamine), containing an NiII atom (site symmetry ) in square-planar NiN4 coordination, is described and contrasted with related structures containing NiII in octahedral coordination with axial X − ligands (X − = variable anions). The dialkylated N atom has an appreciably longer bond length to the NiII atom [1.9666 (13) Å] than does the unsubstituted N atom [1.9202 (14) Å]. The Ni—N bond lengths in [Ni(Et2en)2]Br2 are significantly shorter than corresponding values in tetragonally distorted [Ni(Et2en)2 X 2] compounds (X = −O2CCF3, OH2, or −NCS), which have a triplet ground state. The electronic configuration in these axially ligated [Ni(Et2en)2 X 2] compounds populates the metal-based d x 2 -y 2 orbital, which is Ni—N antibonding in character. Each Et2en ligand in each [Ni(Et2en)2]2+ cation forms a pair of N—H⋯Br hydrogen bonds to the Br− anions, one above and below the NiN4 square plane. Thus, a ribbon of alternating Br− pairs and [Ni(Et2en)2]2+ cations that are canted at 65° relative to one another is formed by hydrogen bonds.
