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2-salicylidine-4-aminophenyl benzimidazole (SAPbzlH, LH) has been synthesised and its complexes, formulated as ZnX 2 Ly.nH 2 O (X = Cl, y = 1.5, n = 1; X = Br, y = 2, n = 2; X = CH 3 COO, y = 1.5, n = 2), CdX 2 L.CH 3 OH.0.5H 2 O (X = Cl, Br) and HgX 2 L.nH 2 O (X = Cl, n = 2; X = Br, n = 0), have been characterised. A single crystal X-ray diffraction study of [Cd 2 Br 4 L 2 ].2CH 3 OH.H 2 O has revealed its binuclear structure with dibromide and SAPbzlH bridges, the environment around each metal ion being distorted trigonal bipyramidal. A similar structure is envisaged for the chloride analogue of cadmium as well as the mercury complexes.

The Schiff base, 2-salicylidene-4-aminophenyl benzimidazole in ethanol undergoes activation of -N=CH- bond by Ni(2+) in the presence of ammonia or primary alkyl amine to produce nickel complexes of the formula Ni{o-C(6)H(4)(O)CH NR}(2) . n H(2)O [R  =  H, Me; n  =  0; R  =  Et, n =  0.5] and 4-aminophenyl benzimidazole. The products have been identified by elemental analysis, magnetic susceptibility measurements and IR, ESR, mass and extensive NMR spectral studies. The possible mechanism for the activation of -N=CH- bond has also been proposed.

Cationic Complexes of Platinum and Palladium with p‐Tolylisocyanide.

In the cation of the title compound, C14H13N2S+·Br−, the essentially planar benzimidazole system (r.m.s. deviation = 0.0082 Å) is substituted with a 4-methyl­sulfanylphenyl ring. The dihedral angle between the benzimidazole system and the 4-methyl­sulfanylphenyl ring is 2.133 (2)°. The crystal structure is characterized by strong and highly directional inter­molecular N—H⋯Br hydrogen bonds involving the bromide ion. Moreover, C—H⋯S inter­actions result in chains of mol­ecules along the c axis. The supra­molecular assembly is further stabilized by π–π stacking inter­actions between the benzimidazole system and 4-methyl­sulfanylphenyl rings [centroid–centroid distance = 3.477 (4) Å].

2-(N-methylimidazole-2′-yl-thiomethyl)benzimidazole (L) has been synthesised and the complexes [ML2 (ClO4)2]·2H2O (M = Ni or Cu) and [MLX2] nH2O (M = Cu, X = Cl or Br, n = 0; M = Ni, X = Cl, n = 3; M = Ni, X = Br, n = 0) prepared and characterised. Proposed geometries for the complexes are: octahedral geometry for perchlorate complexes; tetrahedral geometry for chloro-and bromo-complexes; dimeric square pyramidal for the chloro-complex of copper(II).

The asymmetric unit of the title compound, (C14H13N2S)2[CuBr4]·2H2O, contains two cations, one anion and two solvent water molecules that are connected via O—H...Br, N—H...Br and N—H...O hydrogen bonds into a two-dimensional polymeric structure. The cations are arranged in a head-to-tail fashion and form stacks along [100]. The central CuII atom of the anion is in a distorted tetrahedral environment