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A Schiff base ligand,  N , N ′-bis[1-(4-chlorophenyl)ethylidene]ethane-1,2-diamine ( SBL ), was synthesized by condensation of 4-chloroacetophenone with ethylenediamine in methanol in the presence of H 2 SO 4  as catalyst. The structure of  SBL  was elucidated by spectroscopic ( 1 H-NMR,  13 C-NMR, IR and MS) and elemental analyses, and also confirmed by XRD. The  SBL  was used to prepare metal complexes  1-2  with Pb +2  and Cd +2 , respectively. The structures of the complexes were elucidated by IR, MS and elemental analyses. On the basis of electronic spectra and magnetic moment data, octahedral geometry was proposed for the synthesized complexes  1-2 . The conductivity data showed the non-electrolytic nature of the complexes  1-2 . The  SBL  and complexes  1-2  were subjected to measure their biological potential against  Staphylococcus aureus, Bacillus subtilis  and  Escherichia coli  bacteria.  SBL  showed non-significant anti-bacterial potential whereas complexes showed moderate potential as compared to standard impinium. In the toxicity with brine shrimp larvae, complexes showed more toxic effect than the  SBL . In the experiments to determine the stability constants of  SBL  with CuCl 2 , Cu(OAc) 2 , CoCl 2  and Co(NO 3 ) 2 ;  SBL  showed highest stability constants with Cu(OAc) 2  which is 1.550 × 10 7  at 1:1 (L:M) and second highest with Co(NO 3 ) 2  which is 6.861 × 10 6  at 3:2 (L:M).

Synthesis, characterization, biological screening and determination of stability constants of N,N′-Bis[1-(4-chlorophenyl)ethylidene]ethane-1,2-diamine