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The spectrophotometric characteristic of a new reagent 1, 4, 9, 12-tetraaza Cyclo-2, 3, 6, 7, 10, 11, 14, 15 tetrabenzocetanan-5, 8, 13, 16-tetraone (TCTCT) and its complex with Cu(Ⅱ) were studied. The reagent and its complex with Cu(Ⅱ) have a similar maximum absorbance at 446 um. In C6H4(C2O4HK)-NaOH buffer (pH=4.00), the complex of Cu(Ⅱ)-TCTCT formed when it was heated. The absorbance increased with the increase of the concentration of Cu(Ⅱ) in the range of 1 .6x10-7-5.5x 10-5 mol/L. The composition ratio of the complex was formed to be 1: 1 using the molar ratio method. The method was simple, rapid and sensitive, giving an apparent molar absorptivity of 1.25x105 L mol-1 cm-1 and the apparent stability constant of 1 .04x106. The method was directly applied of copper in fresh milk.
The spectrophotometric characteristic of a new reagent 1, 4, 9, 12-tetraazaClolo-2, 3, 6, 7,10,10,11 tetrabenzocetanan-5,8,13,6-tetraone (TCTCT) and its complex The reagent and its complex with Cu (Ⅱ) have a similar maximum absorbance at 446 μm. In C6H4 (C2O4HK) -NaOH buffer (pH = 4.00), the complex of Cu The absorbance increased with the increase of the concentration of Cu (II) in the range of 1 .6 × 10-7-5.5 × 10-5 mol / L. The composition ratio of the complex was formed to be 1 : 1 using the molar ratio method. The method was simple, rapid and sensitive, giving an apparent molar absorptivity of 1.25x105 L mol-1 cm-1 and the apparent stability constant of 1.04x106. The method was directly applied of copper in fresh milk.