3. Results and discussion
3.1. Synthesis and characterization
3.1.1. Dichlorido{2-(phenylazo)pyridine}gold(III) chloride dihydrate, [Au(azpy)Cl2]Cl Æ 2H2O, Au-azpy The synthetic procedure followed is shown in detail in Scheme 1. The ESI-MS spectrum exhibits a positive peak at m/z = 472.30, which corresponds to the cationic structure, {2[Au(azpy)Cl2]CH3CN}2+. A mixture of CH3CN/ H2O, 80:20 was used as eluent. A fragmentation ion was observed at m/z = 183.52 which corresponds to the free azpy ligand. All MS peaks exhibited the correct isotopomer distribution mainly derived from the number of chlorine atoms. The coordination compound showed a KM value recorded in nitromethane at 25 C of 86 X1 cm2 mol1 which occurs in the range from 65–105 X1 cm2 mol1 , attributed to 1:1 electrolyte [30].