Chromogenic aza-12-crown-4 ethers which can be used for the spectrophotometric determination of lithium ion in aqueous solutions are disclosed. The compounds of the invention are particularly useful for the analysis of Li.sup.+ in the presence of Na.sup.+, a situation common in biological and geological systems. The compounds [e.g., 1-(2-oxy-5-nitrobenzyl)-1-hydro-1-aza-4,7,10-trioxacyclododecane], their methods of manufacture, and methods of utilizing the compounds for the analysis of lithium are disclosed.
本发明揭示了可用于
水溶液中
锂离子的分光光度法测定的显色性aza-12-crown-4醚。该发明的化合物特别适用于在
生物和地质系统中常见的Na.sup.+存在下分析Li.sup.+的情况。本发明揭示了该化合物(例如,1-(2-氧基-5-
硝基苯甲基)-1-羟基-1-aza-4,7,10-三氧杂
环十二烷)及其制造方法和利用该化合物进行
锂分析的方法。