Through self-assembly of the (OH)2-Salophen H4L (H4L = N, N′-bis(3-hydroxyl salicylidene)benzene-1,2-diamine) with LnCl3·6H2O (Ln = La, Nd, Yb, Er or Gd), series of [Ln4((OH)2-Salophen)4]-arrayed complexes [Ln4(H2L)2(L)2(EtOH)2] (Ln = La, 1; Ln = Nd, 2; Ln = Yb, 3; Ln = Er, 4 or Ln = Gd, 5) were obtained, respectively. The result of their photophysical properties shows that the strong and characteristic NIR luminescence for complexes 2-3 with emissive lifetimes in microsecond ranges is observed, and the sensitization arises from the excited state (1LC) of the (OH)2-Salophen ligand despite the luminescent quenching with OH-oscillators around the Ln3 + ions.
Scopus Subject Areas
- Physical and Theoretical Chemistry
- Inorganic Chemistry
- Materials Chemistry
- Sensitization for NIR luminescence