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A new water-soluble chromium-selective chromogenic azocalix[4]arene had been synthesized from diazo coupling reaction between calix[4]arene and diazonium salts, and characterized by 1 H NMR, IR,UV and element analysis. It possesses an absorbance maximum at 365nm in buffered aqueous environment, but addition of chromium(III) ion induced a weak blue shift to 350nm and a new absorption peak at...
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