First example of pyrrole-2-carbaldehyde thiosemicarbazone as tridentate dianion in [Pd(η3-N4,N3,S-ptsc)(PPh3)] complex

Reaction of pyrrole-2-carbaldehyde thiosemicarbazone (H2ptsc) with PdCl2(PPh3)2 in 1:1 mol ratio in presence of Et3N leads to complete dechlorination to generate square planar complex, [Pd(η3-N4,N3,S-ptsc)(PPh3)] (1), existing as three independent molecules in the same unit cell, and H2ptsc behaves in an unusual dinegative tridentate mode. Salicylaldehyde thiosemicarbazone (H2stsc) formed similar compound, [Pd(η3-O,N3,S-stsc)(PPh3)] (3).