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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Heteroleptic Ir(III) complexes based on 2-(2,4-difluorophenyl)-pyridine and bisthienylethene: structures, luminescence and photochromic properties
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Heteroleptic Ir(III) complexes based on 2-(2,4-difluorophenyl)-pyridine and bisthienylethene: structures, luminescence and photochromic properties

机译：基于2-（2,4-二氟苯基）-吡啶和联噻吩基乙烯的杂环Ir（III）配合物：结构，发光和光致变色性质

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摘要

Two bisthienylethenes 2-(2-hydroxyphenyl)-4,5-bis[2,5-dimethyl(3-thienyl)]-1H-imidazole (L1H) and 2-(2-hydroxyphenyl)-4,5-bis(2,5-dimethyl(3-thienyl))-1-phenyl-imidazole (L2H), which have a chelating N,O-donor binding site attached to the photochromic core, have been synthesized using a one-pot condensation reaction, and used to prepare the heteroleptic complexes [Ir(dfppy)(2)(L1)]center dot 2CH(3)OH (1) and [Ir(dfppy)(2)(L2)] (2) [dfppyH = 2-(2,4-difluorophenyl)-pyridine]. In the crystal structures of all four compounds, two thiophene groups of each bisthienylethene molecule adopt parallel conformation. Neighboring molecules in L1H and 1 are linked into supramolecular chains through hydrogen bonds. Particularly, the packing structure of 1 contains right-and left-handed 21 helical chains. In contrast, neighboring molecules in L2H and 2 interact only through van der Waals interactions. At room temperature, L1H and L2H in CH2Cl2 show fluorescence emission at 442 nm and 469 nm, respectively. Compounds 1 and 2 in CH2Cl2 reveal broad emission band characteristics of the Ir(III)/dfppy-chromophores at 508 nm and 494 nm, respectively, with a mixing of (MLCT)-M-3 and (LC)-L-3 characters. At room temperature, the photochromism ability of L2H in CH2Cl2 is clearly weaker than that of L1H. Moreover, no photochromism has been observed in 1 and 2. It has been demonstrated that both the substituent group and {Ir(dfppy)(2)}(+) coordination could significantly influence the crystal structures, luminescence and photochromic properties of L1H, L2H, 1 and 2.
机译：两个双噻吩基乙烯2-（2-羟基苯基）-4,5-双[2,5-二甲基（3-噻吩基）]-1H-咪唑（L1H）和2-（2-羟基苯基）-4,5-双（2通过一锅缩合反应合成了具有连接到光致变色核上的螯合N，O-供体结合位点的1,5-二甲基（3-噻吩基）-1-苯基咪唑（L2H），并使用制备杂配物[Ir（dfppy）（2）（L1）]中心点2CH（3）OH（1）和[Ir（dfppy）（2）（L2）]（2）[dfppyH = 2-（2 ，4-二氟苯基）-吡啶]。在所有四种化合物的晶体结构中，每个双噻吩基乙烯分子的两个噻吩基团采用平行构象。 L1H和1中的相邻分子通过氢键连接成超分子链。特别地，1的堆积结构包含右手和左手21条螺旋链。相反，L 2 H和2中的相邻分子仅通过范德华相互作用来相互作用。在室温下，CH2Cl2中的L1H和L2H分别在442 nm和469 nm处显示荧光发射。 CH2Cl2中的化合物1和2分别显示了Ir（III）/ dfppy发色团在508 nm和494 nm处的宽发射带特征，并且混合了（MLCT）-M-3和（LC）-L-3特征。在室温下，L2H在CH2Cl2中的光致变色能力明显弱于L1H。此外，在1和2中未观察到光致变色现象。已证明，取代基和{Ir（dfppy）（2）}（+）配位均可显着影响L1H，L2H的晶体结构，发光和光致变色性能，1和2。

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