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5-Br-PAN-S是一种水溶性的光度显色剂。本文研究了十一种金属离子和5-Br-PAN-S的络合反应,测定了各种金属络合物的pH效应、组成和摩尔吸光系数。Pb~(2+)、Hg~(2+)、V~(5+)、Pd~(2+)及Cu~(2+)(pH≤6)与5-Br-PAN-S的络合比为1∶1,而Fe~(2+)Co~(2+)、Co~(3+)、Ni~(2+)、Cd~(2+)、Zn~(2+)、Mn~(2+)和Gu~(2+)(pH≥8)均为1∶2。由于5-Br-PAN-S金属络合物都溶于水,且灵敏度较高,所以5-Br-PAN-S作为光度显色剂对于多种离子测定都具有一定的应用价值。
5-Br-PAN-S is a water-soluble photochromic developer. In this paper, the complexation reaction of eleven metal ions with 5-Br-PAN-S was studied. The pH effect, composition and molar absorptivity of various metal complexes were determined. Complexation of Pb 2+, Hg 2+, V 5+, Pd 2+ and Cu 2+ (pH≤6) with 5-Br-PAN-S The ratio of Fe 2+ to Co 2+, Co 3+, Ni 2+, Cd 2+, Zn 2+, Mn 2+, (2+) and Gu ~ (2 +) (pH≥8) were all 1: 2. As 5-Br-PAN-S metal complexes are soluble in water and have higher sensitivity, 5-Br-PAN-S as a photochromic reagent has certain value for a variety of ion measurements.