meso-tetra-(3,5-dibromo-4-hydroxyphenyl) porphyrin and its sensitive color-reaction with lead

Abstract

The synthesis of meso-tetrakis(3,5-dibromo-4-hydroxyphenyl)porphyrin[T(DBHP)P] is described. The conditions of the reaction of lead with [T(DBHP)P] were studied and a highly sensitive method for spectrophotometric determination of microamounts of lead was developed. The complex-formation reaction in alkaline 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 ?105 dm3 mol-1. The composition of the complex is 1:2 Pb:T(DBHP)P. Beer's law is obeyed up to 11 mg Pb/25 mL. The interferences of foreign ions were examined and the selectivity is fairly good as compared with the reactions by using other porphyrins.

Key words: PHENOL P, PORPHINE P, SENSITIVITY, LEAD, COLOR REACTION, HYDROXY QUINOLINES, ORGANIC REAGENTS

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XU ZHONGJUAN;WU HUAIQIN;PAN JIAOMAI. meso-tetra-(3,5-dibromo-4-hydroxyphenyl) porphyrin and its sensitive color-reaction with lead[J]. Acta Chimica Sinica, 1989, 47(9): 918-921.

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