Arenediazonium complexes of cobalt(I): synthesis and properties

Abstract

Arenediazonium complexes of cobalt(I) of the type [Co(RN₂)L₄][BPh₄]₂[L = P(OEt)₂Ph, P(OEt)₃, or P(OMe)₃; R = 4-CH₃C₆H₄, 3-CH₃C₆H₄, 2-CH₃C₆H₄, C₆H₅, 4-CH₃OC₆H₄, 4-ClC₆H₄, or 4-FC₆H₄] have been prepared; their characterization by i.r., ¹H, and ³¹P-{¹H} n.m.r. spectra is reported. Reactivity with π-acceptor ligands such as CO, NO, isocyanide, and phosphite is also described. Finally, the reaction of the arenediazonium complexes with chloride ions affording the cobalt(II) derivatives [CoClL₄]⁺ has been investigated; the function of RN₂ as an oxidizing agent in this reaction is also discussed.