Color reactions of Cu2+ with three new different-chain-length tailed porphyrin-pyridine quaternary ammonium salts were studied. The Soret bands of complexes lie at (I), (II) 413 nm and (III) 414 nm, which are separated from those of the diacid forms (I) 443.5 nm, (II) 444 nm and (III) 446 nm. The contrast is about 30 nm. The ratio of Cu2+: reagent in the complexes is 1:1. The apparent molar absorptivities of complexes are (I) 3.4 x 10(5), (II) 2.9 x 10(5) and (III) 2.5 x 10(5) L x mol(-1) x cm(-1), and Beer's law is obeyed in the ranges of (I)0-0.5 microg x (10 mL)(-1), (II) 0-0.6 microg x (10 mL)(-1) and (III) 0-1 .0 microg x (10 mL)(-1) for Cu2+. This method can be used for the determination of trace Cu2+.
[Color reaction of new tailed porphyrin-pyridine quaternary ammonium salts with copper (II)] Publishing Authors By Initials
