Synthesis, Characterization and Dynamic Behavior of Mono- and Dinuclear Palladium(II) Carbene Complexes Derived From 1,1′-Methylenebis(4-alkyl-1,2,4-triazolium) Diiodides

Mononuclear palladium carbene complexes 2a–c and 3 derived from 1,1′-methylenebis(4-alkyl-4,5-dihydro-1H-1,2,4-triazole-5-ylidene) have been obtained by the reaction of 1,1′-methylenebis(4-alkyl-1,2,4-triazolium) diiodides 1a–d with palladium acetate under mild conditions. The mononuclear complexes 2a–c have been transformed into their corresponding trans-binuclear complexes 4a–c. All compounds were characterized by spectroscopic techniques and the dynamic behavior of 2a–cand 4a–c has been studied. The X-ray structures of 2a and 4c are reported.