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Naked-eye detection and discriminant analysis for the determination of anions based on hydroxy anthraquinone chemosensors

M.M.L�?�?�?�?�?�?�?³pez Guerrero, R.Gonz�?�?�?�?�?�?�?¡lez Herrera, A.Aguilar Gallardo, A.Navas D�?�?�?�?�?�?�?­az, F.Garc�?�?�?�?�?�?�?­a S�?�?�?�?�?�?�?¡nchez

Hydroxyanthraquinone derivatives are identified as synthetic receptors of anions giving the possibility of sensing, coding and doing quantitative determination in aqueous solutions of several anions. Interactions between receptor/acceptor are discussed in this paper. An anion selective receptor which is an underdeveloped field has been developed. The strategy used was colorimetric anion sensing based on attaching an appropriate chromophore to a specific anion receptor. In this work, naked eyed sensing of several anions and a multianion (acetate, bromide, carbonate, phosphate and tartrate) discriminant analysis has been developed using the signal ratios of the peaks at 450nm and 550 nm. Discriminant analysis shows that the anion groups are well separated and can be easily classified. Good sensitivity and selectivity for discrimination of these anions were obtained. And finally photometric/fluorimetric quantitative determination of sodium carbonate in aqueous solution were investigated, and the detection limits obtained were 5 µM (RSD 1.2 % (n=10), fluorimetric method) and 60 µM (RSD 0.5 % (n=10), photometric method.