Gold-dppm-Arylazoimidazole Complexes: Synthesis, Spectra, and Redox Study
[Ag(tht)(OTf)]-assisted reaction produces , reacts with in dichloromethane medium followed by ligand addition, and leads to , (1–3), abbreviated as N,-chelator, where N(imidazole) and N(azo) represent N and , resp.; R = H (a), Me (b), Cl (c) and = Me (1), (2), (3), dppm is diphenylphosphinomethane, is the triflate anion, and tht is tetrahydrothiophen). Ir spectra of the complexes show –C=N– and –N=N– stretching near at 1590 and 1370 and near at 1100, 755, 695, 545, and 505 due to the presence of dppm. The NMR spectral measurements suggest that methylene, ––, in RaaiEt gives a complex AB type multiplet while in Raai it shows AB type quartets. Electrochemistry assigns ligand reduction.
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