Nickel(II)-dppa-arylazoimidazole complexes: Synthesis and detailed spectroscopic study

The reaction of [Ni(dppa)(Cl)2] or [Ni(dppa)(Br)2] with AgOTf gives [Ni(dppa)(OTf)2], which then form [Ni(dppa)(RaaiR)](OSO2CF3)2 under the action of arylazoimidazole(RaaiR) in a dichloromethane medium [RaaiR′ = p-R-C6H4-N=N-C3H2-NN-1-R′, (I–III), abbreviated as N,N′-chelating agent, where N(imidazole) and N(azo) represent N and N’, respectively; R = H (a), Me (b), Cl (c) and R′ = Me (I), CH2CH3 (II), CH2Ph (III), OSO2CF3 is the triflate anion]. The 1H NMR spectral measurements suggest that a bound azoimine is responsible for a number of signals of phenyl protons in the aromatic region. The molecules of the complexes contain a number of different carbon atoms which gives a number of different peaks in the 13C (1H) NMR spectrum. The text was submitted by the author in English.