Putting cyaphide in its place: determining the donor/acceptor properties of the κ C-cyaphido ligand

  • Chem Sci. 2023 Apr 6;14(17):4627-4632. doi: 10.1039/d3sc01126g.
Eric S Yang  1 ,  Emma Combey  1 ,  Jose M Goicoechea  2
Affiliations
  • 1. Department of Chemistry, University of Oxford, Chemistry Research Laboratory 12 Mansfield Rd. Oxford OX1 3TA UK.
  • 2. Department of Chemistry, Indiana University 800 East Kirkwood Ave. Bloomington Indiana 47405 USA [email protected].
PMID: 37152258 DOI: 10.1039/d3sc01126g
Abstract

The synthesis of group 9 pyridine-diimine complexes M(DippPDI)X and [M(DippPDI)L]+ (M = Co, Rh; DippPDI = 1,1'-(pyridine-2,6-diyl)bis(N-(2,6-diisopropylphenyl)ethan-1-imine); X = CP-, CCH-; L = CO, t BuNC) bearing a series of strong-field ligands, including the cyaphide ion (C[triple bond, length as m-dash]P-), is reported. A combined experimental and computational comparative study of the group 9 PDI cyaphide complexes Co(DippPDI)(CP) and Rh(DippPDI)(CP), as well as the N-heterocyclic carbene (NHC) gold(i) cyaphide complex Au(IDipp)(CP) (IDipp = 1,3-bis(2,6-diisopropylphenyl)imidazol-2-ylidene), reveals the σ donor and π acceptor properties of the κC-cyaphido ligand, and allow us to suggest a position for this ion in the spectrochemical series.