Department of Chemistry
Anion-induced self-assembly of luminescent and magnetic homoleptic cyclic tetranuclear Ln4(Salen)4 and Ln4(Salen)2 complexes (Ln = Nd, Yb, Er, or Gd)
Unique homoleptic cyclic tetranuclear Ln4(Salen)4 complexes [Ln4(L)2(HL)2(μ3-OH) 2Cl2]·2Cl (Ln = Nd, 1; Ln = Yb, 2; Ln = Er, 3; Ln = Gd, 4) or Ln4(Salen)2 complexes [Ln4(L) 2(μ3-OH)2(OAc)6] (Ln = Nd, 5; Ln = Yb, 6; Ln = Er, 7; Ln = Gd, 8) have been self-assembled from the reaction of the hexadentate Salen-type Schiff-base ligand H2L with LnCl 3·6H2O or Ln(OAc)6·6H 2O (Ln = Nd, Yb, Er, or Gd), respectively (H2L: N,N′-bis(salicylidene)cyclohexane-1,2-diamine). The result of their photophysical properties shows that the strong and characteristic NIR luminescence for complexes 1-2 and 5-6 with emissive lifetimes in microsecond ranges are observed, and the sensitization arises from the excited state (both 1LC and 3LC) of the hexadentate Salen-type Schiff-base ligand with the flexible linker. Temperature dependence (1.8-300 K) magnetic susceptibility studies of the eight complexes suggest the presence of an antiferromagnetic interaction between the Ln3+ ions. © 2012 American Chemical Society.
Source Publication Title
American Chemical Society
Link to Publisher's Edition
Feng, Weixu, Yao Zhang, Zhao Zhang, Xingqiang Lü, Han Liu, Guoxiang Shi, Dan Zou, Jirong Song, Daidi Fan, Wai-Kwok Wong, and Richard A. Jones. "Anion-induced self-assembly of luminescent and magnetic homoleptic cyclic tetranuclear Ln4(Salen)4 and Ln4(Salen)2 complexes (Ln = Nd, Yb, Er, or Gd)." Inorganic Chemistry 51.21 (2012): 11377-11386.