Articles written in Journal of Chemical Sciences

    • N4-dibenzosuberene substituted thiosemicarbazones based targetable fluorescent probe for multi-anion recognition


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      Two novel N4-suberene substituted thiosemicarbazone chemosensors (SATSC 1 and SATSC 2)designed and synthesised for the colorimetric and optical response towards anions were studied. Dimethylsulphoxidesolution of SATSC 1-2 show bands in 350-400 nm region that are tuned for major π interactionsin the heterocyclic system. Among the various anions only fluoride, acetate and cyanide exhibit good sensingresponses. From the UV spectrum analysis, the emergence of a new red-shifted band with the colour changeof solutions from yellow to dark yellow or orange due to the deprotonation is witnessed. Here, two processesoccur mainly i.e., in the first step comes with the formation of a stable complex and a second step in which thesensor is deprotonated by the anions. These non-fluorescent sensors display fluorescent enhancement afterbinding with the F-/AcO-/CN- ions. The fluorescent studies which are in good agreement with the observedchanges in that of UV experiments. The stoichiometric ratio was calculated for all the receptors with anionsand found it as in a 1:1 ratio. The sensor SATSC 2 shows a better binding affinity towards fluoride anion thanSATSC 1. The binding mechanism and H-donating ability of the receptors are evaluated based on theobserved fluorescence enhancement and 1H NMR titrations experiments with the fluoride. Constructed Logicgate behaviour over the reversibility experiments of the sensors SATSC 2 with the addition of fluoride andcalcium ion.

      Synopsis This article reports two novel N4 suberene substituted thiosemicarbazone probes for the optical detection of some biologically and environmentally active anions like F-/AcO-/CN- ions. Studied the acidic –N-H proton triggered photo physical changes by UV, Luminescence and NMR spectroscopy. Logic operations were performed with binary inputs produced from reversibility study.

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