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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Heteroleptic Ir(III) and Pt(II) complexes based on 2-(2,4-difluorophenyl)-pyridine and bisthienylethene BrLH: the influence of the metal center on structures, luminescence and photochromism
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Heteroleptic Ir(III) and Pt(II) complexes based on 2-(2,4-difluorophenyl)-pyridine and bisthienylethene BrLH: the influence of the metal center on structures, luminescence and photochromism

机译：基于2-（2,4-二氟苯基）-吡啶和联噻吩基乙烯BrLH的杂合Ir（III）和Pt（II）配合物：金属中心对结构，发光和光致变色的影响

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Heteroleptic complexes [Ir(dfppy)(2)(BrL)]center dot 3CH(3)OH (1) and [Pt(dfppy)(BrL)]center dot CH3OH (2) have been prepared based on the same ligands including bisthienylethene BrLH and dfppyH = (2-(2,4-difluorophenyl)pyridine). Complexes 1 and 2 reveal distinct crystal structures. The BrL- anion uses its phenol-imidazole moiety to coordinate with an {Ir(dfppy)(2)}(+) unit in the former, while with a {Pt(dfppy)}(+) unit in the latter. Neighboring [Ir(dfppy)(2)(BrL)]/[Pt(dfppy)(BrL)] molecules are connected through extensive hydrogen bonds and aromatic stacking interactions, thus forming a supramolecular chain structure in 1, and a layer structure in 2. Upon irradiation with 380 nm light, compound 2 shows photochromic behavior in CH2Cl2, with a color change from nearly colorless to light green. However, no photochromism was observed in compound 1. At room temperature, compound 1 reveals phosphorescence with a predominant (MLCT)-M-3 character both in CH2Cl2 solution (emissions at 495 and 513 nm) and in the solid state (emission at 524 nm). Compound 2 exhibits phosphorescence with a predominant (LC)-L-3 character in CH2Cl2 solution (emission at 508 nm), but it is almost non-luminescent in the solid state. Our experimental results demonstrate that the metal centers in 1 and 2 could significantly influence their structures, photochromism, and luminescence behaviors.
机译：基于相同的配体，包括双联苯乙烯，制备了[Ir（dfppy）（2）（BrL）]中心点3CH（3）OH（1）和[Pt（dfppy）（BrL）]中心点CH3OH（2） BrLH和dfppyH ＝（2-（2，4-二氟苯基）吡啶）。配合物1和2显示出不同的晶体结构。 BrL-阴离子利用其酚-咪唑部分与前者中的{Ir（dfppy）（2）}（+）单元配位，而后者中则与{Pt（dfppy）}（+）单元配位。相邻的[Ir（dfppy）（2）（BrL）] / [Pt（dfppy）（BrL）]分子通过广泛的氢键和芳族堆积相互作用连接，从而在1中形成超分子链结构，在2中形成层结构。在用380nm的光照射时，化合物2在CH 2 Cl 2中显示出光致变色行为，其颜色从几乎无色变为浅绿色。但是，在化合物1中未观察到光致变色现象。在室温下，化合物1在CH2Cl2溶液（在495和513 nm的发射）和固态（在524的发射）下均显示出具有主要（MLCT）-M-3特征的磷光。 nm）。化合物2在CH2Cl2溶液中显示主要（LC）-L-3特征的磷光（在508 nm处发射），但在固态时几乎不发光。我们的实验结果表明，金属中心1和2可以显着影响其结构，光致变色和发光行为。

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