| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1304075 | Inorganic Chemistry Communications | 2012 | 5 Pages |
With ZnL1 or ZnL2 from the simple Salen-type Schiff-base ligand H2L1 (H2L1═N,N′-bis(3-methoxysalicylidene)-ethylene-1,2-diamine) or the carbazole-modified Salen-type Schiff-base ligand H2L2 (H2L2═N,N′-bis(3-methoxy-5-{2-[4-(N-carbazyl)-phenyl]-ethynyl}-ethylene-1,2-diamine) as the precursor, two series of four bimetallic ZnLn complexes (Ln=Nd(1 or 3), Ln=Gd (2 or 4) are obtained, respectively. The photophysical properties results showed that the sensitization from the excited state (1LC and 3LC) of the ligand H2L1 or H2L2 and the effective energy transfer of Zn2+-Schiff-base (ZnL1 or ZnL2) to the Nd3+ ion for the NIR luminescence were realized, respectively. Especially through the cabarzole modification, the improved NIR luminescence of the ZnNd complex 3 was observed due to the realization of the energy level's match of the excited state of the chromophore to the Nd3+ ion's exciting state.
Graphical abstractIn the Zn–Nd Schiff-base complexes from H2L1 or the carbazole-modified H2L2, through the carbazole modification, the improved NIR luminescence of the ZnNd complex 3 was observed, due to the avoiding of the luminescent quenching effect arising from OH-, CH- or NH-oscillators of the solvates around the Nd3+ ion in combination with the realization of the energy level's match of the excited state of the chromophore to the Nd3+ ion's exciting state.Figure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Carbazole-modified Salen-type Schiff-base ligand. ► Effective sensitization and efficient energy transfer. ► Enhancement of near-infrared luminescence of the Zn–Nd binuclear Schiff-base complexes.
