Studies on Palladium(II) Complexes Containing Multidentate N-heterocycles

Palladium dihalides/perchlorate react with the multidentate N-heterocycles (I), 1,3-bis(benzimidazol-2-yl)benzene (L¹) 1,3-bis(1-methylbenzimidazol-2-yl)benzene (L²), 2,6-bis(benzimidazol-2-yl)pyridine (L³) and 2,6-bis(1-methylbenzimidazol-2-yl) pyridine (L⁴) in ethanol/tetrahydrofuran in presence of hydrohalic acid to yield complexes of the compositions, [PdX₂L·nH₂O] (X = Cl, L = L¹ or L², n = 1; X = Cl, L = L³ or L⁴, n = 0; X = Br, L = L¹ or L³ n = 0; X = Br, L = L², n = 3; X = Br, L = L⁴, n = 2), PdL₂(ClO₄)₂·nH₂O (L = L¹, n = 2; L = L², n = 1) and [Pd₂L₃(ClO₄)₄·nH₂O] (L = L³, n = 2; L = L⁴, n = 0). The complexes were characterised by elemental analysis, molar conductance measurements, IR, electronic, ¹H, ¹³C NMR and FAB-mass spectral studies.