Department of Chemistry
Hetero-trinuclear near-infrared (NIR) luminescent Zn2Ln complexes from Salen-type Schiff-base ligands
With the Zn-Schiff-base [ZnL1(Py)] or [ZnL2(Py)] from the simple Salen-type Schiff-base ligand H2L1 or H 2L2 (H2L1: N,N′- bis(salicylidene)ethylene-1,2-diamine; H2L2: N,N′-bis(salicylidene)phenylene-1,2-diamine) without the outer O 2O2 portion as the precursor, two series of eight trinuclear Zn2Ln arrayed complexes (Ln = Nd (1 or 5), Yb (2 or 6), Er (3 or 7) or Gd (4 or 8)) have been obtained by the further reaction with Ln(NO3)3·6H2O, respectively. The results of photophysical studies show that the strong and characteristic NIR luminescence with emissive lifetimes in microsecond ranges, has been sensitized from the excited state (1LC and 3LC or only 1LC) of the ligand, whereas the Zn(ii)-based visible luminescence is mostly quenched because of quite effective intramolecular energy transfer from the ligand-centered excited state of the Zn(ii)-Schiff base complex to Ln(iii) ions. © 2009 The Royal Society of Chemistry and the Centre National de la Recherche Scientifique.
Source Publication Title
New Journal of Chemistry
Royal Society of Chemistry
Bi, Weiyu, Tao Wei, Xingqiang Lü, Yani Hui, Jirong Song, Shunsheng Zhao, Wai-Kwok Wong, and Richard A. Jones. "Hetero-trinuclear near-infrared (NIR) luminescent Zn2Ln complexes from Salen-type Schiff-base ligands." New Journal of Chemistry 33.11 (2009): 2326-2334.