摘要
近年来水溶性卟啉衍生物在分析化学中的应用逐渐增多，例如meso-四（对磺基苯）卟啉、meso-四（3－N－甲基吡啶）卟啉及meso-四（对羟基苯）卟啉等 已被用于测定痕量金属离子的高灵敏显色剂，但多数金属离子－卟啉配合物需要在加热条件下形成，其选择性也甚差，因此在实际工作中应用尚不多，鉴于一些有机试剂的多溴代衍生物，在酸度、选择性方面的优越性，我们合成了一种新的卟啉试剂meso-四（3，5－二溴－4－羟基苯）卟啉[T(DBHP)P]，研究了它的性质及其与Pb^2+的反应条件，制定了测定痕量Pb^2+的新光度法，该法灵敏度甚高（s=2.40×10^5)，在8－羟基喹啉存在下，反应可在室温下迅速进行，其选择性也甚好，可成为光度测定痕量Pb^2+的优良方法。
The synthesis of meso-tetra-(3, 5-dibromo-4-hydroxyphenyl) porphyrin [T(DBHP)Pl
is described. The conditions of the reaction of lead with [T(DBHP)P] were studied and
a highly sensitive method for spectrophotometric determination of micro amounts of lead
has been developed. The complex-formation reaction in alkalene solution can be
accelerated at room temperature in the presence of oxine. The Soret band lies at 479 nm
with an apparent molar absorptivity of 2.40×10~5 dm^3·mol^(-1)·cm^(-1). Beer's law is obeyed
up to a concentration of 11μg Pb~^(2+) in 25 mL of solution. The interferences of foreign ions
wero examined and the selectivity is fairly good as compared with the reactions by using
other porphyrins.
出处
《化学学报》
SCIE
CAS
CSCD
北大核心
1989年第9期918-921,共4页
Acta Chimica Sinica
