The accurate experimental electron density of crystalline bis(5- cyclooctadiene)nickel, Ni(COD)2, has been determined by X-ray diffraction (T = 125 K, 17 051 reflections measured for 2θ ≤ 96°) and it has been interpreted in terms of quantum theory of atoms in molecules (QTAM). The data were measured with a CCD area detector, whose performances were tested. This experimental electron density study of a π-ligand η2-coordinated to a metal atom is intended to test the Dewar-Chatt-Duncanson (DCD) bonding formalism providing further information about the π-complex vs metallacycle dichotomy. QTAM analysis, within the NiC2 triangle, shows a ring structure with a bond critical point between the two C(sp2), two bond critical points between Ni and each carbon, and one ring critical point in its center. Topology speaks for a π-complex with a concave ring structure and the overall bonding picture is in agreement with the DCD model: σ-donation and π-back-bonding are recognized in the Ni-C bond paths, which are inwardly curved (σ-donation) but well separated (π-back-donation).
Experimental Electron Density Studies for Investigating the Metal π-Ligand Bond: the Case of Bis(1,5-cyclooctadiene)nickel / P. Macchi, D.M. Proserpio, A. Sironi. - In: JOURNAL OF THE AMERICAN CHEMICAL SOCIETY. - ISSN 0002-7863. - 120:7(1998), pp. 1447-1455.
|Titolo:||Experimental Electron Density Studies for Investigating the Metal π-Ligand Bond: the Case of Bis(1,5-cyclooctadiene)nickel|
MACCHI, PIERO (Primo)
PROSERPIO, DAVIDE MARIA (Secondo)
SIRONI, ANGELO AGOSTINO DANIELE (Ultimo)
|Settore Scientifico Disciplinare:||Settore CHIM/03 - Chimica Generale e Inorganica|
|Data di pubblicazione:||1998|
|Digital Object Identifier (DOI):||http://dx.doi.org/10.1021/ja972558l|
|Appare nelle tipologie:||01 - Articolo su periodico|