Near-IR Luminescence and Field-Induced Single Molecule Magnet of Four Salen-type Ytterbium Complexes
Near-IR Luminescence and Field-Induced Single Molecule Magnet of Four Salen-type Ytterbium Complexes
复制标题
四种 Salen 型镱配合物的近红外发光和场致单分子磁体
DOI：
10.1021/ic502194d
复制
发表时间：
2015
影响因子：
4.6
通讯作者：
Li Guang-Ming
中科院分区：
文献类型：
--
作者：
Liu Tian-Qi;Yan Peng-Fei;Luan Fang;Li Yu-Xin;Sun Jing-Wen;Chen Chuan;Yang Fan;Chen Han;Zou Xiao-Yan;Li Guang-Ming
合成了一系列六齿Salen型（H2 L）镱配合物[Yb 2L 3（CH 3OH）]·3CH 3CN（1）、[Yb 2LL ′L″（CH 3OH）（H2O）2]（ClO 4）2·CH 3OH·H2O（2）、[Yb 2L（OAc）4（CH 3OH）2]·2CH 3OH（3）和{[Yb 2L（OAc）4]·3 H2O}n（4）。H2 L与各种Yb ~（3+）盐反应，合成了N，N′-双（2-氧-3-甲氧基苯亚甲基）-1，2-苯二胺，HL′ = 2-（2′-羟基-3 ′-甲氧基苯基）苯并咪唑，HL”= 3-甲氧基水杨醛。X-射线衍射分析表明，配合物1为三层结构的Yb_2L_3，其H_2L/Yb = 3：2; 2和3具有独特的Yb_2核，其H_2L/Yb = 2：2和1：2;所有的配合物1 - 4表现出近红外发光，这可以合理化的不同的结构效应的基础上。磁性分析表明，配合物1 - 4均为场致单分子磁性，在3 kOe直流电场下的势垒（Ueff/kB）分别为14.5，2.0，9.5和2.4K。
A series of rigid hexadentate salen-type (H2L) ytterbium complexes, namely, [Yb2L3(CH3OH)]·3CH3CN (1), [Yb2LL′L″(CH3OH)(H2O)2](ClO4)2·CH3OH·H2O (2), [Yb2L(OAc)4(CH3OH)2]·2CH3OH (3), and {[Yb2L(OAc)4]·3H2O}n(4) (H2L =N,N′-bis(2-oxy-3-methoxybenzylidene)-1,2-phenylenediamine, HL′ = 2-(2′-hydroxy-3′-methyloxy-phenyl)benzimidazole and HL” = 3-methoxysalicylaldehyde) have been synthesized by reactions of H2L with multifarious Yb3+salts. X-ray crystallographic analyses demonstrate that complex1is of a triple-decker sandwich-type Yb2L3structure with a ratio of H2L/Yb = 3:2,2and3possess the unique Yb2core with a ratio of H2L/Yb = 2:2 and 1:2, respectively,4exhibits one dimensional coordination polymers in which the polymeric structures are formed by acetate (OAc–) groups. All complexes1–4exhibit near-IR luminescence, which can be rationalized on the basis of the disparate structural effects. The magnetic analysis unveils that all complexes1–4are of field-induced single-molecule magnet behavior with the energy barriers (Ueff/kB) of 14.5, 2.0, 9.5, and 2.4 K at 3 kOe direct current fields, respectively.