TỔNG HỢP, TÍNH CHẤT CÁC PHỨC CHẤT CỦA Tb(III), Dy(III), Yb(III) VỚI HỖN HỢP PHỐI TỬ BENZOIC VÀ 2,2’-DIPYRIDINE-N-OXIDE

Tóm tắt

This paper presents the synthesis of several complexes of Ln (III) (Ln: Tb, Dy, Yb) with mixed ligands
(benzo c and 2,2’-dipyridine-N-oxide). They are represented by the general formula of
Ln(Benz)2(DipyO)(H2O)2 (Ln: Tb, Dy, Yb; Benz-
: Benzoate, D p O: 2,2’-dipyridine-N-oxide). The
characterization of these complexes has been studied by IR, thermal analysis, mass, and emission
spectroscopy approaches. The results from IR spectroscopy suggested that complexes had been synthesized
successfully, and the coordination modes of the ligands to Ln(III) centres had been investigated by IR
spectroscopy. Mass spectroscopy findings showed that the synthesized complexes were monomers and
that they are stable. In addition, thermal analysis indicates that they are all quite stable to heat. The
emission spectra of the Tb(Benz)2(DipyO)(H2O)2 displayed three bands arising from the
5D4 → 7F5 dominant transition located at 545 nm, the weaker 5D4 → 7F6,
5D4 → 7F4 transitions located at
490 and 587 nm, respectively. The emission spectra of the Yb(Benz)2(DipyO)(H2O)2 displayed one band at
452 nm, meaning the 2F5/2→2
I7/2 energy level of Yb3+ was observed. The results of our study demonstrated
that these complexes exhibited room-temperature photoluminescence.