Abstract：A new reagent 5-(5-bromo-3-iodine-2-pyridylazo)-2,4-diaminotoluene(5-Br-3-I-PADAT) was designed and synthesized using 5-bromo-3-iodine-2-aminopyridine and 2,4-diaminotoluene as the raw material. Its structure was characterized by infrared spectroscopy (IR) and nuclear magnetic resonance (NMR). The coloring reaction between this reagent and Rh (III) was studied. The experimental results showed that 5-Br-3-I-PADAT could react with Rh (III) in HAc-NaAc buffer solution (pH 4.8) to form a stable brownish red complex. This complex had two absorption peaks at 536nm and 576nm, respectively. Beer′s law was obeyed for Rh (III) in the range of 0.04-0.70μg/mL. The detection limit of method was 0.010μg/mL. The apparent molar absorptivity was 2.18×105 L·mol-1·cm-1. The proposed method was applied for the determination of trace rhodium in rhodium-carbon catalyst. The found results were consistent with the reference values. The relative standard deviation (RSD, n=6) was 0.88%. The recoveries were 98% and 96%, respectively.
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HUO Yan-yan, HAN Quan, LI Xin, YANG Xiao-hui. Study on the synthesis of 5-(5-bromo-3-iodine-2-pyridylazo)-2, 4-diaminotoluene and its application in coloring reaction with rhodium (III). , 2018, 38(8): 48-52.
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