Abstract

Reaction of [Au(C₆F₅)₂(OSO₂CF₃)₂] with RaaiR^´ in dichloromethane medium followed ligand addition leads to [Au(C₆F₅)₂(RaaiR^/)](OTf) [RaaiR^/ = p-R-C₆H₄-N=N-C₃H₂-NN-1-R^/, (1 - 3), abbreviated as N,N^/-chelator, where N(imidazole) and N(azo) represent N and N^/, respectively; R = H (a), Me (b), Cl (c) and R^/ = Me (1), CH₂CH₃ (2), CH₂Ph (3), OSO₂CF₃ is the triflate anion, C₆F₅ is the pentafluorophenyl ring]. Ir spectra of the complexes show --C=N-- and --N=N-- stretching near at 1590 and 1370 cm^-1 and near at 1510, 955, 800 cm^-1 due to the presence of pentafluoropheny ring. The ¹H NMR spectral measurements suggest methylene, –CH₂–, in RaaiEt gives a complex AB type multiplet while in RaaiCH₂Ph it shows AB type quartets. In the ¹H-¹H COSY spectrum of the present complexes and contour peaks in the ¹H-¹³C HMQC spectrum, assign the solution structure and stereoretentive transformation in each step.

Key words: Gold (III), arylazoimidazole, H, C, COSY, HMQC, electrochemistry, ESI mass.