TY - JOUR
T1 - Near-infrared (NIR) luminescent hetero-tetranuclear Zn2Ln 2 (Ln = Nd, Yb or Er) complexes self-assembled from the benzimidazole-based HL and two rigid 4,4′-bipyridine ligands with different spacers
AU - Zhang, Zhao
AU - Feng, Weixu
AU - Su, Peiyang
AU - Liu, Han
AU - Zhang, Yao
AU - Wang, Zheng
AU - Miao, Tiezheng
AU - Lü, Xingqiang
AU - Fan, Daidi
AU - Wong, Rick W K
AU - Jones, Richard A.
N1 - Funding Information:
This work is funded by the National Natural Science Foundation (912222201, 21173165, 20871098), the Program for New Century Excellent Talents in University from the Ministry of Education of China (NCET-10-0936), the State Key Laboratory of Structure Chemistry (20100014), the Provincial Natural Foundation (2011JQ2011) of Shaanxi, the Education Committee Foundation of Shaanxi Province (11JK0588), Graduate Innovation and Creativity Fund (YZZ12038) of Northwest University, Hong Kong Research Grants Council (HKBU 202407 and FRG/06-07/II-16) in P. R. of China.
PY - 2013/12
Y1 - 2013/12
N2 - (Chemical Equation Presented) Through the self-assembly of the benzimidazole-based ligand HL (HL = 2-(1H-benzo[d]imidazol-2-yl)-6- methoxyphenol) with Zn(OAc)2·2H2O, Ln(NO 3)3·6H2O (Ln = Nd, Yb, Er or Gd) and 4,4′-bipyridine ligand (bpy, 4,4′-bipyridine or bpe, trans-bis(4-pyridyl)ethylene), two series of Zn2Ln 2-arrayed complexes [Zn2Ln2(L) 4(bpy)(NO3)6] (Ln = Nd, 1; Yb, 2; Er, 3 or Gd, 4) and [Zn2Ln2(L)4(bpe)(NO3) 6] (Ln = Nd, 5; Yb, 6; Er, 7 or Gd, 8) were obtained, respectively. The result of their photophysical properties shows that the characteristic near-infrared (NIR) luminescence of Nd3+, Yb3+ or Er 3+ ion has been sensitized from the excited state (both 1LC and 3LC) of the mixed HL and bipyridyl ligands in both complexes 1-3 and 5-7. Moreover, the change from bpy to bpe bridging for the fine-tuning of whole molecular conjugations, attributing to the different crossings of the two benzimidazole-based L- ligands, has the important influence on their NIR luminescent properties.
AB - (Chemical Equation Presented) Through the self-assembly of the benzimidazole-based ligand HL (HL = 2-(1H-benzo[d]imidazol-2-yl)-6- methoxyphenol) with Zn(OAc)2·2H2O, Ln(NO 3)3·6H2O (Ln = Nd, Yb, Er or Gd) and 4,4′-bipyridine ligand (bpy, 4,4′-bipyridine or bpe, trans-bis(4-pyridyl)ethylene), two series of Zn2Ln 2-arrayed complexes [Zn2Ln2(L) 4(bpy)(NO3)6] (Ln = Nd, 1; Yb, 2; Er, 3 or Gd, 4) and [Zn2Ln2(L)4(bpe)(NO3) 6] (Ln = Nd, 5; Yb, 6; Er, 7 or Gd, 8) were obtained, respectively. The result of their photophysical properties shows that the characteristic near-infrared (NIR) luminescence of Nd3+, Yb3+ or Er 3+ ion has been sensitized from the excited state (both 1LC and 3LC) of the mixed HL and bipyridyl ligands in both complexes 1-3 and 5-7. Moreover, the change from bpy to bpe bridging for the fine-tuning of whole molecular conjugations, attributing to the different crossings of the two benzimidazole-based L- ligands, has the important influence on their NIR luminescent properties.
KW - Complexes
KW - Mixed HL-bipyridine ligands
KW - Sensitization of NIR luminescence
UR - http://www.scopus.com/inward/record.url?scp=84884711689&partnerID=8YFLogxK
U2 - 10.1016/j.saa.2013.06.122
DO - 10.1016/j.saa.2013.06.122
M3 - Journal article
C2 - 23912177
AN - SCOPUS:84884711689
SN - 1386-1425
VL - 116
SP - 102
EP - 110
JO - Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy
JF - Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy
ER -