Detection of Pb(II) and Cu(II) Heavy Metal Ions Based on Fluorescence Using Metal Ion Complex of La(III) with Pyrazoline Derivative Ligands Yulian Syahputri(a*), Sutanto(a), Erdiana Putri Pertiwi(a)
(a) Department of Chemistry, Faculty of Mathematics and Natural Science, Universitas Pakuan, Jl. Pakuan PO.BOX 452, Bogor 16143, West Java, Indonesia
*syahputri.yulian[at]unpak.ac.id
Abstract
Exposure of heavy metal ions Pb(II) and Cu(II) in Indonesia to humans and the environment has received increasing attention, especially in various industries and transportation. The complex compound La(III) with fluorescence based pyrazoline derived ligands has the potential to detect heavy metal ions Pb(II) and Cu(II), this is because the lanthanide metal ions with pyrazoline derived ligands have strong and distinctive photophysical fluorescence properties. The results showed that the synthesis of pyrazoline-derived ligands and La(III) complex compounds was successful, the yield of the La(III) complex compound was 81.90% (yellow solid, melting point \(268.8^{o}\) ). The results of the fluorescence spectrophotometer showed two emission peaks, the absorption peak of the La(III) complex compound was in the 370 nm region with fluorescence intensity of 2925 a.u and a 470 nm region with a fluorescence intensity of 796.4 a.u. The determination of the fluorosensor potential of the La(III) complex compound with the addition of Pb(II) and Cu(II) metal ions showed a significant fluorescence change so that the fluorosensor type was obtained for the La(III) metal ion complex compound with Pb(II) and Cu(II), namely turn-off.
Keywords: Pyrazoline, Fluorosensor, Lanthanum, Complex Compound, Heavy Metal Ions
