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The reaction between a suitable cyanine and a bicyclophosphane gives in good yield new eight membered cyclic phosphonate podands. Their complexation with calcium and magnesium cations induces an enhancement of the fluorescence intensity. Thus, these labelled heterocycles are convenient sensors for the detection of divalent cations.
Three compounds, which comprise of benzo[e]indolinium luminophores with two different fluorescence wavelengths, have been synthesized. Those compounds have been prepared by condensation of benzo[e]indolinium and their counterpart aldehydes, and they were confirmed by H-NMR, MS, IR. The absorption and fluorescence spectra of them were tested. The influences of pH value and various solvents on their...
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