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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) - 吡啶和双噻吩乙烯的异质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)]·2CH3OH (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 3MLCT and 3LC 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-羟苯基)-4,5-双[2,5-二甲基(3-噻吩基)]-1H-咪唑(L1H)和2-(2-羟苯基)-4,5-双(2通过一锅缩合反应合成了具有连接至光致变色核的螯合N,O-供体结合位点的,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)]·2CH3OH(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,并具有3MLCT和3LC特征的混合。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,1和2的晶体结构,发光和光致变色性能。 。

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