Amine-substituted α-N(standard)- and δ-N(remote)-pyridylidene complexes: Synthesis and bonding |
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| Authors: | Elzet Stander-Grobler Oliver Schuster Helgard Raubenheimer |
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| Institution: | a Department of Chemistry and Polymer Science, University of Stellenbosch, Private Bag X1, Matieland, 7602 Stellenbosch, South Africa
b Institut für Anorganische und Analytische Chemie, Goethe-Universität Frankfurt, Max-von-Laue-Strasse 7, D-60348 Frankfurt am Main, Germany |
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| Abstract: | Reaction of ortho-amino-para-chloro- and ortho-chloro-para-amino-pyridinium triflate with tetrakis(triphenylphosphine) complexes of Ni or Pd afforded by oxidative substitution compounds that can be represented as cationic carbene complexes. NMR as well as X-ray structural studies revealed the role played by the NMe2 and M(PPh)2Cl (M = Ni or Pd) substituents in stabilizing the complexes by π-retro-donation and, consequently, in governing the relative importance of certain mesomeric representations describing their structures. |
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| Keywords: | NHC Remote pyridylidene Amino pyridylidene Palladium Nickel |
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