Abstract

Reaction of [Pd(PPh₃)₂Cl2/Br₂] with AgOTf in dichloromethane followed by addition of ligand leads to [Pd(PPh₃)2(OSO2CF₃)₂] and then [Pd(PPh₃)₂(RaaiR)](OSO₂CF₃)₂ [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]. ³¹P {1H} NMR confirm that due to the two phosphorus atoms interaction in the azoimine environment resulting sharp peaks. The ¹H NMR spectral measurements suggest chelating proton with lot of phenyl protons in the aromatic region. In the ¹H-¹H COSY spectrum of the present complexes and contour peaks in the ¹H-¹³C HMQC spectrum, assign the solution structure in each complexes.

Key words: Palladium (II), arylazoimidazole, ¹H ¹³C(¹H), ³¹P(¹H), ¹H -¹H COSY,¹H- ¹³C HMQC NMR, ESI mass, IR spectra, electrochemistry.