Palladium(II) chloride or nitrate complexes of phenothiazine and its derivatives have been prepared. The new complexes were characterized by their elemental analyses, molar conductivity, magnetic susceptibility and spectroscopic data. The molecular formulae of the complexes were found to be: [C 1 2 H 9 NS) 2 PdCl 2 ].H 2 O where C 1 2 H 9 NS = phenothiazine (PTZ); [C 1 2 H 8 ClNS) 2 PdCl 2 ] where C 1 2 H 8 ClNS = 2-chlorophenothiazine (CPTZ); [(C 2 1 H 2 7 N 2 S 2 )Pd 2 Cl 5 ].2H 2 O where (C 2 1 H 2 7 N 2 S 2 ) + = protonated thioridazine (TRH + ); and [(C 1 7 H 2 1 N 2 S) 2 Pd 2 Cl 5 ]NO 3 where (C 1 7 H 2 1 N 2 S) + = protonated promethazine (PMH + ). The PM complex behaves as an electrolyte whereas the other complexes act as nonelectrolytes in solution. All the complexes are diamagnetic species. Tentative structures have been proposed.