PGSE NMR studies on RAPTA derivatives: evidence for the formation of H-bonded dicationic species

The self-aggregation tendency of RAPTA complexes {[Ru(?6-p-cymene){PTA(-R)}Cl2]X, R ) H (1BPh4 and 1PF6) and Me (2BPh4 and 2OTf), and [Ru(?6-p-cymene)(PTA)2Cl]X (3BPh4 and 3BF4)} in acetone-d6 was inVestigated by means of diffusion NMR spectroscopy. On increasing the concentration, the protonated species (1X) undergoes intercationic self aggregation driVen by hydrogen bonding that leads to the formation of 12 2+ dications and a small amount of 12X+ ion triples