A Series of dinuclear lanthanide(III) complexes constructed by Schiff Base and β-diketonate Ligands: synthesis, structure, luminescence and SMM behavior
A Series of dinuclear lanthanide(III) complexes constructed by Schiff Base and β-diketonate Ligands: synthesis, structure, luminescence and SMM behavior
复制标题
由希夫碱和β-二酮配体构建的一系列双核镧系元素(III)配合物：合成、结构、发光和SMM行为
作者：
Ou Sun;Peng Chen;Hong-Feng Li;Ting Gao;Wen Bin Sun;Guang-Ming Li;Peng-Fei Yan
本文报道了一系列由Schiff碱和β-二酮配体构成的新型同结构镧系配合物[Ln_2（DBM）_6（L）]（Ln = Sm（1）; Eu（2）; Gd（3）; Dy（4）; Yb（5））; L = N，N' -双（吡啶-2-亚甲基）乙烷-1，2-二胺，DBM =二苯甲酰甲烷）。用单晶X射线晶体学测定了同晶配合物1-5的结构。配合物1-5中的两个Ln（III）离子通过Schiff碱配体桥连，呈现弯曲构型。配合物1、2和5不仅在固态下而且在甲醇溶液中均表现出镧系离子基发光。还测定了发光的寿命和量子产率。磁性分析表明，配合物4和5具有场诱导单分子磁性，并具有一定的能垒。(Ueff/kB）分别为46.78和22.97 K。
A series of new isostructural lanthanide (III) complexes are reported which are constructed from Schiff base and β-.diketonate ligands, namely, [Ln2(DBM)6(L)] (Ln = Sm (1); Eu (2); Gd (3); Dy (4); Yb(5)); L = N,N' -bis(pyridin-2-.ylmethylene)ethane-1,2-diamine, DBM = dibenzoylmethanide). The structures of the isomorphous complexes 1–5 were.determined by single-crystal X-ray crystallography. The two Ln(III) ions in the molecules of 1–5 are bridged by Schiff base.ligand that displays a curved configuration. Complexes 1, 2 and 5 exhibit lanthanide ion based luminescence not only in the.solid state but also in methanol solution. Lifetimes and quantum yields of luminescence were also determined. The magnetic.analysis reveals that complexes 4 and 5 are of field-induced single-molecule magnet behavior with the energy barriers.(Ueff/kB) of 46.78 and 22.97 K at 2000 Oe direct current fields, respectively,reported.