@phdthesis{eprintsunpak9826,
           month = {July},
          author = {Risma Diana Putri},
            year = {2025},
           title = {Kemosensor Ion Logam Berat Pb2+ dan Cr3+ Berbasis Fluoresensi Menggunakan
Senyawa Kompleks Ion Logam Tb3+ Dengan Ligan Turunan Pirazolin},
          school = {Universitas Pakuan},
        abstract = {Kemosensor Ion Logam Berat Pb2+ dan Cr3+ Berbasis Fluoresensi Menggunakan
Senyawa Kompleks Ion Logam Tb3+ Dengan Ligan Turunan Pirazolin
Risma Diana Putria*)
, Sutantoa*) Yulian Syahputrib)
a)Departemen Kimia, Fakultas Matematika dan Ilmu Pengetahuan Alam, Universitas Pakuan, Bogor, 16129, Indonesia
*)Corresponding Author: sutanto@unpak.com.
ABSTRACT
Tb3+ metal ions have excellent fluorescence properties, but have a low absorption coefficient. To
address this deficiency, lanthanide ions typically chelate with ligands that have extensive, intense absorption
bands, including pyrazoline, which can form highly stable terbium ion complexes. Other metal ions can disrupt
the fluorescence properties of such complex compounds. This research was conducted to synthesize complex
compounds of Tb3+ metal ions with pyrazoline-derived ligands. The resulting complex compounds will be used
as fluorosensors for Pb2+ and Cr3+ heavy metal ions. The results showed that the synthesis of Tb3+ metal ion
complex compounds with pyrazolin-derived ligands obtained a brownish-yellow yield of 60.67\% pyrazolinderived ligands, with a melting point of 210oC and pale yellow Tb3+ complex compound solids obtained a yield
of 46.05\% with a melting point of 225oC. The results of FTIR obtained N-H bonds or amines (3412.56 cm-1
),
C-H in the pyridine aromatic ring (3128.58 cm-1
), C=N in the pyrazolin group (2384.2 cm-1
), and Tb-N
(1635.40 cm-1
). The results of scanning 3 Tb3+ metal ion complex compounds with pyrazolin-derived ligands
using a UV-Vis spectrophotometer obtained three absorption peaks at 223 nm, 370 nm, and 454 nm with molar
log ? absorption values of 4.78, 4.36, and 4.25, respectively. The maximum peak uptake of Tb3+ complex
compounds with pyrazoline-derived ligands was at 480 nm with a fluorescence intensity of 2231 a.u., which
indicates that the complex compounds have a high fluorescence intensity. The fluorescence study of complex
compounds in the addition of Pb2+ and Cr3+ metal ions shows that the fluorosensor type of Tb3+ metal ion
complex compound can be used as a turn-on type Pb2+ heavy metal ion fluorosensor and a turn-off type Cr3+

heavy metal ion fluorosensor.
Keywords: Fluorosensor, Pyrazine derivatives, Heavy metals, Tb3+ complex.},
             url = {http://eprints.unpak.ac.id/9826/}
}