Synthesis and physicochemical, DFT, thermal and DNA-binding analysis of a new pentadentate NS Schiff base ligand and its [CuNS] complexes.

A new NS pentadentate Schiff base ligand derived from 5-bromothiophene-2-carbaldehyde, ()-1-((5-bromothiophen-2-yl)methylene)-2-(2-(()-((5-bromothiophen-2-yl)-methylene amino) ethyl ethane-1,2-diamine, is prepared. The ligand and its complexes are subjected to extensive physical and theoretical analyses and the results are consistent with their predicted compositions. Dicationic Cu(ii) complexes ([CuNS]X) with a coordination number of 5 are proposed on the basis of the spectral data with NS serving as a pentadentate ligand.