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第二部分 高比缔合物形成的光度法 为了进一步提高光度分析的灵敏度,一些分析工作者对缔合物的发展是:研究和选择适宜条件,使中心离子和配位体形成配位饱和而电价不饱和的、体积庞大的多价络阴离子(例如中心离子和某些酸性染料形成的螯合阴离子,和二氯化锡形成的双金属络阴离子以及和钼、钒等形成的杂多酸等)或多价络阳离子(例如中心离子和邻菲罗啉、吡啶等形成的络阳离子),然后在必要时改变反应条件(如原有条件适合于缔合反应则不改变),使之和多个强烈显色的抗衡离子(前者主要是碱性染料的RH~+型体,后者主要是卤代萤光素或三苯甲烷酸性染料的阴离子)缔合。由于在反应中增大了显色分子和中心离子的缔合比(一般是2∶1—5∶1),因此新发展起来的这类光度法的克分子吸收系数多为
The second part of the photometric method to form a high ratio of association In order to further improve the sensitivity of photometric analysis, some analysts associate the development of: research and selection of appropriate conditions, so that the center ions and ligands form a coordination and saturation Unpowered, bulky polyvalent anions (eg chelating anions formed by central and certain acid dyes and bimetallic anions formed with tin dichloride and heteropolyacids formed with molybdenum, vanadium, etc. ) Or polyvalent cations (eg, cations of the central ion and o-phenanthroline, pyridine and the like), and then changing the reaction conditions as necessary (if the original condition is suitable for the association reaction, it does not change) Strongly colored counterion (the former is primarily a basic dye RH ~ + type, the latter is mainly halogenated luciferin or triphenylmethane acid dye anion) association. The newly developed spectrophotometric method has a higher molecular absorption coefficient due to the increased association ratio of the chromogenic and central ions (typically 2: 1 to 5: 1) in the reaction