The infrared spectra of the square-planar dialkynyl complexes of nickel(II), palladium(II) and platinum(II)

Abstract

The stability of the metal-carbon bond in bis(triethylphosphine)dialkynyl complexes of NiII, PdII and PtII was investigated through the substituent effect exerted on metal-carbon stretching frequencies, and a linear relationship was established between the square of the frequencies and Taft's polar constants of the substituents on alkynyl groups.The relationship was interpreted in terms of dπ-pπ interaction between central metal and alkynyl groups. The interaction is considered to reinforce the metal-carbon bond.