TỔNG HỢP, TÍNH CHẤT PHÁT QUANG CỦA CÁC PHỨC CHẤT TẠO BỞI Nd3+, Sm3+, Eu3+ VỚI HỖN HỢP PHỐI TỬ SALICYLIC VÀ 2,2’-DIPYRIDINE-N-OXIDE

Tóm tắt

In this paper, the luminescent properties of three synthesis complexes of Ln (III) (Ln: Nd, Sm, Eu) with mixed
l nds (s l l nd 2,2’-dipyridine-N-oxide) are described. The complexes correspond to their general
formula of Ln(Sal)2(DipyO)(H2O)2 (Ln: Nd, Eu; Sal-
: l l , D p O: 2,2’-dipyridine-N-oxide) and
Sm(Sal)2(DipyO). The products were characterized by IR, thermal analysis, mass, and emission
spectroscopy. The findings from IR spectroscopy suggested that complexes had been synthesized
successfully, in which three of them consisted of neutral monomeric molecules. The thermal analysis
indicated that they were all quite stable to heat. The luminescent spectra of the Eu(Sal)2(DipyO)(H2O)2
displayed five bands arising from the 5D0 –
7F2 dominant transition located at 614 nm, whereas the
weaker 5D0 –
7F1,
5D0 –
7F4 transitions located at 592 and 700 nm, respectively. Notably, the weakest 5D0 –
7F0,
5D0 –
7F3 transitions were located at 579, 652 nm, respectively. The luminescent spectra of the
Sm(Sal)2(DipyO) displayed three weak bands at 561, 598, and 645 nm, arising from 4G5/2 –
6H5/2,
4G5/2 –
6H7/2,
4G5/2 –
6H9/2 transitions. These complexes demonstrated photoluminescence under UV light at room
temperature.