Generating, visualizing and tuning π-π interactions in metal-induced supramolecular assembly.

IF 2.4 3区化学 Q2 CHEMISTRY, MULTIDISCIPLINARY

CrystEngComm Pub Date : 2026-09-04 DOI:10.1039/d6ce00611f

Giau Le-Hoang, Laure Guénée, Claude Piguet

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Abstract

This work emphasizes the role of metal complexation for controlling and tuning static/dynamic π-stacked organizations responsible for the programmed light emission of the bichromophoric pyrene-terimine ligand L2 upon photoexcitation. Its binding to the closed-shell trivalent yttrium guest [Y(hfac)₃] (hfac = 1,1,1,5,5,5-hexafluoro-pentane-2,4-dione) provides a diamagnetic heteroleptic [L2Y(hfac)₃] adduct for which the static intramolecular pyrene-pyrene excimer emission operating in the free ligand L2 is transformed into a dynamic intramolecular pyrene-pyrene excimer emission in the resulting complex. The transition from static-to-dynamic intramolecular excimers results in an enhanced sensitivity toward interactions with electron-poor nitrobenzene guests, which is supported by a considerable Stern-Volmer quenching constant measured for [L2Y(hfac)₃]. This demonstrates that the metal-directed organization of the polyaromatic ligand in [L2Y(hfac)₃] can boost the excimeric chemical sensing of target aromatic analytes.

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金属诱导的超分子组装中π-π相互作用的产生、可视化和调谐。

本研究强调了金属配合物在控制和调节静态/动态π堆叠组织中的作用，这些组织负责光激发下双色芘末端配体L2的程序化发光。它与封闭壳层的三价钇客体[Y(hfac)3] （hfac = 1,1,1,5,5,5-六氟戊烷-2,4-二酮）的结合提供了一种抗磁性杂性[L2Y(hfac)3]加合物，使在自由配体L2中操作的静态分子内芘-芘准分子发射转化为在所得到的配合物中动态的分子内芘-芘准分子发射。从静态到动态分子内准分子的转变导致对与电子贫乏的硝基苯客体相互作用的敏感性增强，这得到了相当大的Stern-Volmer猝灭常数[L2Y(hfac)3]的支持。这表明[L2Y(hfac)3]中多芳配体的金属定向组织可以增强目标芳香族分析物的模拟化学传感。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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