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- W2610112103 abstract "Abstract The vitamin K3 derivatives 2-methyl-3-[(pyridin-2-ylmethyl)-amino]-1,4-naphthoquinone ( M-1), 2-methyl-3-[(pyridin-2-ylethyl)-amino]-1,4-naphthoquinone ( M-2), 2-methyl-3-((2-(thiophen-2-yl)methyl)amino)naphthalene-1,4-dione ( M-3 ) and 2-methyl-3-((2-(thiophen-2-yl)ethyl)amino)naphthalene-1,4-dione ( M-4) have been synthesized, characterized and studied for their chemosensor abilities towards transition metal ions. Crystal structures of M-1 to M-4 revealed a variety of N H⋯O, C H⋯O, C H⋯π and π⋯π interactions. Minor variations in such interactions by chemical stimuli such as metal ions, results in change in color that can be visualized by naked eyes. It has been shown that electronic structure and 1 H NMR, vibrational as well as electronic spectra from the density functional theory agree well with the experiments. The metal ion binding in ethanol, ethanol-water and in mild base triethylamine brings forth recognizing ability of M-1 toward Ni 2+ whereas M-2 exhibits large sensing ability for Cu 2+ ion. Interestingly M-1 display varying metal ion binding specificity in different solvents with the association constant in ethanol being 11,786 M −1 for Ni 2+ compared to 9462 M −1 for the Cu 2+ . A reversal in preferential binding of M-2 with the respective association constants being 4190 M −1 and 6370 M −1 is discernible." @default.
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- W2610112103 date "2017-09-01" @default.
- W2610112103 modified "2023-10-01" @default.
- W2610112103 title "Binding selectivity of vitamin K3 based chemosensors towards nickel(II) and copper(II) metal ions" @default.
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- W2610112103 doi "https://doi.org/10.1016/j.molstruc.2017.04.094" @default.
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