Synthesis, Characterization, and Bioactivity of Schiff Bases and Their Cd^𝟐+, Zn^𝟐+, Cu^𝟐+, and Ni^𝟐+ Complexes Derived from Chloroacetophenone Isomers with S-Benzyldithiocarbazate and the X-Ray Crystal Structure of S-Benzyl-β-N-(4-chlorophenyl)methylenedithiocarbazate

Scheme 1

Schematic diagram of the synthesis procedure for NS4 and NS2 ligands.