Synthesis, Characterisation and Antibacterial Activity of Some Indole Derivatives and Their Inclusion Complexes with β-Cyclodextrin

The condensation product of isatin with semicarbazide(IstscabH), thiosemicarbazide (IsttscabH) and thiocarbohydrazide (BisttcabH) form inclusion complexes with beta-cyclodextrin (beta-cydx=C42H70O35), in 1:1 molar ratio having composition [beta-cydx-IstscabH/IsttscabH] and [(beta-cydx-BisttcabH)]. The inclusion complexes have been charactised from the studies of IR, UV, NMR and molecular weight determination. The inclusion products are thermally more stable than beta-cyclodextrin (240 degrees C). The IR, UV and NMR spectra of isatin derivatives are affected on forming inclusion complexes with beta-cyclodextrin ring. The inclusion products as well as isatin derivatives show ionic nature at room temperature in DMF solution. The antibacterial activity of inclusion products are larger than simple Schiff bases.