Abstract
Abstract Schiff bases from S-benzoyl dithiocarbamate and thiophene 2-aldehyde (A) and 4-N-N-dimethyl aminobenzaldehyde (B) have been synthesized. Their complexes of the type (Ml2Cl)2.4H20 with lanthanides have been characterized on the basis of IR, NMR and UV-visible spectroscopy, elemental analysis and magnetic moment measurements. The nephelauxetic effect (1-β), bonding parameter β b1/2, Sinha covalency parameter δ and the molar conductance measurement in nitrobenzene reflect covalent nature for the complexes. The stability constants and other thermodynamic data have been determined in aqueous solutions at 25, 30 and 35°C. The toxicity of the Schiff bases and their complexes were evaluated against insects and fungi. The LD50 for cockroaches and percent growth inhibition of fungi show greater efficacy for the complexes than for the Schiff bases.
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