TY - JOUR
T1 - Hetero-trinuclear near-infrared (NIR) luminescent Zn2Ln complexes from Salen-type Schiff-base ligands
AU - Bi, Weiyu
AU - Wei, Tao
AU - Lü, Xingqiang
AU - Hui, Yani
AU - Song, Jirong
AU - Zhao, Shunsheng
AU - WONG, Rick W K
AU - Jones, Richard A.
PY - 2009
Y1 - 2009
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=70350774526&partnerID=8YFLogxK
U2 - 10.1039/b9nj00228f
DO - 10.1039/b9nj00228f
M3 - Journal article
AN - SCOPUS:70350774526
SN - 1144-0546
VL - 33
SP - 2326
EP - 2334
JO - New Journal of Chemistry
JF - New Journal of Chemistry
IS - 11
ER -