Pentanuclear sandwich-type Zn-II-Ln(III) clusters based on a new Salen-like salicylamide ligand: Structure, near-infrared emission and magnetic properties

Pentanuclear sandwich-type Zn-II-Ln(III) clusters based on a new Salen-like salicylamide ligand: Structure, near-infrared emission and magnetic properties
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基于新型Salen类水杨酰胺配体的五核夹心型Zn-II-Ln(III)簇:结构、近红外发射和磁性能

DOI:
10.1016/j.poly.2017.03.019
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发表时间:
2017
期刊:
影响因子:
2.6
通讯作者:
Song Xue-Qin
Song Xue-Qin
中科院分区:
化学3区
文献类型:
--
作者:
Liu Pan-Pan;Wang Cai-Yun;Zhang Mo;Song Xue-Qin

文献摘要

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Salen类配体,[Zn 2 Er 3(HL)(2)(H2 L)(2)(OH)(2)(NO3)(3)](NO3)(2)中心点2CH(3)OH(Zn 2 Er 3),[Zn 2 Yb 3(HL)(2)(H2 L)(2)(OH)(2)(NO3)(3)](NO3)(2)中心点2CH(3)OH(Zn 2 Yb 3),H3 L = 1-(2-羟基-4-甲氧基-苯甲酰氨基)-2-(2-羟基-3-甲氧基苯亚甲基氨基)-乙烷的合成和结构表征。单晶结构分析表明,这两个化合物均为五核簇合物,其三核Ln(3)(III)为羟基桥连,由两个Zn-II离子、两个单去质子的H2 L-配体、两个双去质子的HL配体和三个硝酸根阴离子包裹。光物理测定表明,这两个Zn-II-Ln(III)化合物显示出配体中心和近红外发射。磁化率测量结果表明,Zn_2Er_3具有反铁磁相互作用,零场慢磁化弛豫是单分子磁体的特征。
Salen-like ligand, [Zn2Er3(HL)(2)(H2L)(2)(OH)(2)(NO3)(3)](NO3)(2)center dot 2CH(3)OH (Zn2Er3), [Zn2Yb3(HL)(2)(H2L)(2)(OH)(2) (NO3)(3)](NO3)(2)center dot 2CH(3)OH (Zn2Yb3), H3L = 1-(2-hydroxy-4-methoxy-benzamido)-2-(2-hydroxy-3-methoxybenzylideneamino)-ethane, were prepared and structurally characterized. Single-crystal structure analyses reveal that both compounds are pentanuclear clusters with a hydroxyl bridged trinuclear Ln(3)(III) core swaddled by two Zn-II ions, two singly deprotoned H2L- ligands, two doubly deprotoned HL ligands and three nitrate anions. Photophysical determination indicates that the two Zn-II-Ln(III) compounds display both ligand-centered and near -infrared emission. The magnetic susceptibility measurements reveal that Zn2Er3 displays antiferromagnetic interactions with zero field slow magnetization relaxation diagnostic of single -molecule -magnet (SMM).