Novel chromogenic derivatives of 1,2-bis(0-aminoaryloxy)ethane-N,N,Nʹ,Nʹ-tetraacetic acid are useful for the determination of calcium ions in both solution and dry assays. These compounds comprise a dye moiety which is directly conjugated to the acetic acid substituted-nitrogen atom and which enables the compounds to exhibit maximum absorbance at a wavelength generally greater than 400 nm before complexation. When the compounds are complexed with calcium ions, the absorbance shifts to a shorter wavelength.
1,2-双(0-
氨基芳氧基)
乙烷-N,N,Nʹ,Nʹ-
四乙酸的新型发色性衍
生物可用于溶液和干燥试验中
钙离子的测定。这些化合物包含一个
染料分子,该
染料分子直接与
乙酸取代的氮原子共轭,使化合物在络合前的最大吸光度波长一般大于 400 纳米。当这些化合物与
钙离子络合时,吸光度会向更短的波长移动。