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Homoaromaticity in Tris(ethylene)nickel(0) and Tris(ethyne)nickel(0)
Author(s) -
Herges Rainer,
Papafilippopoulos Andrea
Publication year - 2001
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/1521-3773(20011217)40:24<4671::aid-anie4671>3.0.co;2-t
Subject(s) - nickel , delocalized electron , cyclohexane , tris , ethylene , benzene , chemistry , catalysis , photochemistry , inorganic chemistry , organic chemistry , biochemistry
An ACID test for aromaticity : A number of criteria prove that tris(ethylene)nickel( 0 ) and tris(ethyne)nickel( 0 ) are aromatic compounds. The ligands strongly interact in the periphery and are “on the way” to trimerizing to cyclohexane and benzene, respectively. The electronic structure of these complexes (see picture, which shows the current density vectors plotted onto the ACID surface of the nickel ethylene complex) sheds light upon the role of Ni 0 as a catalyst in cyclooligomerization reactions. ACID = anisotropy of the induced current density; a method for visualizing the density of delocalized electrons and for quantifying conjugation effects.