• Arunabha Thakur

      Articles written in Journal of Chemical Sciences

    • Click-generated triazole based ferrocene-carbohydrate bioconjugates: A highly selective multisignalling probe for Cu(II) ions

      Arunabha Thakur Sinjinee Sardar Sundargopal Ghosh

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      Two Cu2+-specific colorimetric sensors, based on ferrocene-carbohydrate bioconjugates, 2, C46H56O20N6Fe and 3, C28H33O10N3Fe were designed and synthesized in good yields. Both the compounds, 2 and 3, behave as very selective and sensitive chromogenic and electrochemical chemosensor for Cu2+ ion in aqueous environment (CH3CN/H2O (2:8, $v/v$). The analytical detection limit (ADL) for receptor 2 was $7.5 \times 10^{−7}$ M. The considerable changes in their absorption spectra of 2 and 3 are accompanied by the appearance of a new low energy (LE) peak at 630 nm (2: $\epsilon = 1600$ M-1 cm-1 and 3: 822 M-1 cm-1). This is further accompanied by a strong colour change from yellow to dark green that allows the prospective for `naked eye’ detection of Cu2+ ion.

    • Investigation on reactivity of non-classical carbenes with sterically hindered Lewis acid, $B(C_{6}F_{5})_{3}$ under inert and open conditions


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      Reactions of $B(C_{6}F_{5})_{3}$ with abnormal N-heterocyclic carbene (aNHC), L1 and cyclic(alkyl)(amino) carbene (cAAC), L2 in the presence of moisture as well as in its absence, have been investigatedin toluene. Reaction of aNHC with 1 equivalent of $B(C_{6}F_{5})_{3}$ under inert condition produced classical Lewisacid-base adduct, [L1. $B(C_{6}F_{5})_{3}$ 1. Further, probing the same reaction with cyclic (alkyl)(amino) carbene(cAAC), having different electronic property, led to the isolation of [L2 $B(C_{6}F_{5})_{3}$, 2 under inert condition.Interestingly, reaction of aNHC or cAAC with 1 equivalent of $B(C_{6}F_{5})_{3}$ in the presence of moisture resulted inwater splitting leading to the formation of [L1-H][(OH) $B(C_{6}F_{5})_{3}$ and [L2-H][(OH) $B(C_{6}F_{5})_{3}$, 4. All thesecompounds (1-4) were characterized in solution by $^{ 1}H$, $^{13}C$, $^{19]F$ and $^{ 11}B$ NMR spectroscopy. Additionally, thesolid-state structures were unambiguously established by crystallographic analysis of compounds 1-4.

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