1.
Angew Chem Int Ed Engl
; 45(23): 3859-62, 2006 Jun 02.
Article
in English
| MEDLINE
| ID: mdl-16671147
2.
Dalton Trans
; (9): 1226-33, 2006 Mar 07.
Article
in English
| MEDLINE
| ID: mdl-16482361
ABSTRACT
A series of cationic pyridinylidene and quinolinylidene complexes of chlorobis(triphenylphosphine)-nickel(II) were prepared by oxidative substitution of Ni(PPh3)4 with methylated chloropyridines or chloroquinolines. NMR as well as X-ray crystallographic studies confirmed the trans arrangement of the two phosphines in the products. Calculations, using suitable model compounds at the BP86/TZVP level, clearly differentiate between a standard imidazolylidene complex and new complexes of the NHC-type on the one hand, and new complexes classified as rNHC-types-with the heteroatom distant from the carbene carbon-on the other. The latter form significantly stronger bonds-mainly of an electrostatic nature-with the metal.