Abstract
Two complexes[Ni (L 1 ) 2 ]·2H 2 O ( 1 ) and[Ni (L 2 ) 2 ]·2H 2 O ( 2 ) have been synthesized using the bezimidazole derived tridentate (NNO donor) potential Schiff base ligands HL 1 and HL 2 , which are prepared from reaction of 2-aminoethyl-1 H -benzimidazole with 5-chlorosalicylaldehyde and 5-bromosalicylaldehyde, respectively, and characterized by elemental analysis, FT-IR and UV-Vis spectroscopies and single crystal X-ray crystallography. In 1 and 2 , each Ni(Ⅱ) has a distorted octahedral arrangement with a N 4 O 2 donor set in trichelated fashion of the Schiff base ligands. Furthermore, the complex units in 1 and 2 are linked into 2D and 3D supramolecular networks by H-bonding in the solid state, respectively. The bioactivity studies showed that both the two complexes exhibit moderate to strong antibacterial activities against S. aureus (Gram-positive) and E. coli (Gram-negative) bacteria and were found more active than the corresponding Schiff base ligands.
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