A Novel Deep Blue-Emitting ZnII Complex Based on Carbazole-Modified 2-(2-Hydroxyphenyl)benzimidazole: Synthesis, Bright Electroluminescence, and Substitution Effect on Photoluminescent, Thermal, and Electrochemical Properties
A Novel Deep Blue-Emitting ZnII Complex Based on Carbazole-Modified 2-(2-Hydroxyphenyl)benzimidazole: Synthesis, Bright Electroluminescence, and Substitution Effect on Photoluminescent, Thermal, and Electrochemical Properties
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DOI：
10.1021/jp803325g
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发表时间：
2008-09
影响因子：
3.7
通讯作者：
Hui-Jun Xu;Zhi-Feng Xu;Zhengyu Yue;Pengfei Yan;Bin Wang;Liping Jia;Guangming Li;Wenbin Sun;Ju-wen Zhang
中科院分区：
文献类型：
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作者：
Hui-Jun Xu;Zhi-Feng Xu;Zhengyu Yue;Pengfei Yan;Bin Wang;Liping Jia;Guangming Li;Wenbin Sun;Ju-wen Zhang
采用改进的方法合成了一种新型的基于咔唑功能化N^O配体的深蓝色锌配合物Zn（Lc）2（Lc− = 2-（1-（6-（9 H-carbazol-9-yl）hexyl）-1H-benzo[d]imidazol-2-yl）phenolate）。为了比较，还制备了另外两种Zn II配合物（Zn（La）2，La− = 2-（1H-苯并[d]咪唑-2-基）苯酚盐; Zn（Lb）2，Lb− = 2-（1-乙基-1H-苯并[d]咪唑-2-基）苯酚盐）。研究了取代基对配合物发光和热学性质的影响。研究表明，取代基对配合物的固态发射具有意想不到的增强蓝移效应：取代基越大，配合物的发射蓝移越大（Zn（Lc）2的深蓝发射波长最短，为422 nm）。大体积取代基所引起的空间位阻效应可能是重要因素之一。在三种Zn Ⅱ配合物中，Zn Ⅱ的分解温度最高。
A novel deep blue-emitting ZnII complex Zn(Lc)2 (Lc− = 2-(1-(6-(9H-carbazol-9-yl)hexyl)-1H-benzo[d]imidazol-2-yl)phenolate) based on a carbazole-functionalized N^O ligand was synthesized by a modified method. Other two ZnII complexes (Zn(La)2, La− = 2-(1H-benzo[d]imidazol-2-yl)phenolate; Zn(Lb)2, Lb− = 2-(1-ethyl-1H-benzo[d]imidazol-2-yl)phenolate) were also prepared for comparison. The remarkable substitution effect on the photoluminescent and thermal properties of the complexes was studied. The investigation indicated an unexpected amplifying hypsochromic effect of the substituents on the emission of the complex in the solid state: the larger substituent corresponded to the larger blue shift of the emission of the complex (Zn(Lc)2 has the shortest emission wavelength of 422 nm as the deep blue emission among these three complexes). The stronger steric effect induced by the bulky substitutions should be one of the most important factors. Among the three ZnII complexes, the temperature of decomposition of...