The chemosenssor that consists of [ Zn₂ (1,3-bis[bis(2-pyridylmethyl)aminomethyl]benzene)] ⁴⁺ (receptor) and pyrecatechol violet (signaling unit) detects with naked eyes di- and tri-phosphates conjugated to nucleosides or in free forms. The blue color of the aqueous solution (pH 7.0) of the sensor turns to yellow upon exposing to the analytes.
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Min Su Han (2004) studied this question.
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