RESUMO
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.
RESUMO
In the anion of the title compound, (C(14)H(13)N(2)S)(2)[CdBr(4)]·C(2)H(5)OH, the Cd(II) atom is in a distorted tetra-hedral environment and one of the Br atoms is disordered over three sites with site-occupancy factors of 0.828â (5), 0.106â (3) and 0.068â (4). In the crystal, inter-molecular N-Hâ¯O, C-Hâ¯O and N-Hâ¯Br inter-actions result in a two-dimensional polymeric network extending parallel to (010).
RESUMO
In the cation of the title compound, C(14)H(13)N(2)S(+)·Br(-), the essentially planar benzimidazole system (r.m.s. deviation = 0.0082â Å) is substituted with a 4-methyl-sulfanylphenyl ring. The dihedral angle between the benzimidazole system and the 4-methyl-sulfanylphenyl ring is 2.133â (2)°. The crystal structure is characterized by strong and highly directional inter-molecular N-Hâ¯Br hydrogen bonds involving the bromide ion. Moreover, C-Hâ¯S inter-actions result in chains of mol-ecules along the c axis. The supra-molecular assembly is further stabilized by π-π stacking inter-actions between the benzimidazole system and 4-methyl-sulfanylphenyl rings [centroid-centroid distance = 3.477â (4)â Å].
RESUMO
The asymmetric unit of the title compound, (C(14)H(13)N(2)S)(2)[CuBr(4)]·2H(2)O, contains two cations, one anion and two solvent water mol-ecules that are connected via O-Hâ¯Br, N-Hâ¯Br and N-Hâ¯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 Cu(II) atom of the anion is in a distorted tetra-hedral environment.