In this paper, we demonstrate that chiral J-aggregates of porphyrins are able to detect minute chiral impurities, in this case, the presence of right-handed quartz in acid-activated K10 montmorillonite clay. Aggregation and symmetry breaking of 5,10,15,20-(tetra-4-carboxyphenyl) porphyrin (TCPP) and 5,10,15,20-(tetra-4-sulfonatophenyl) porphyrin (TPPS) were observed during their interaction with acid-activated montmorillonite clay (MMT-K10). A panel of characterization techniques, including UV-visible, electronic circular dichroism, IR, and vibrational circular dichroism spectroscopies, as well as X-ray scattering, were employed to investigate the aggregation of the confined TPPS and TCPP. An intriguing and persistent negative exciton effect was detected in the electronic circular dichroism spectra at the early stages of J-aggregation. The enrichment of a right-handed quartz impurity in the clay detected by vibrational circular dichroism may explain the symmetry breaking in the porphyrin assemblies. As a result, we propose that chiral porphyrin aggregates could serve as innovative probes for detecting subtle chirality in inorganic nanomaterials.

中文翻译：

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卟啉 J 聚集体作为手性杂质的探针，它们在蒙脱石粘土中的限制打破对称性证明了这一点


在本文中，我们证明了卟啉的手性 J 聚集体能够检测微小的手性杂质，在这种情况下，酸活化 K10 蒙脱石粘土中存在右旋石英。5,10,15,20-（四-羧基苯基）卟啉 （TCPP） 和 5,10,15,20-（四-4-磺基苯基）卟啉 （TPPS） 在与酸活化蒙脱石粘土 （MMT-K10） 的相互作用过程中观察到聚集和对称性断裂。采用一组表征技术，包括 UV-visible、电子圆二色性、IR 和振动圆二色性光谱，以及 X 射线散射，来研究受限 TPPS 和 TCPP 的聚集。在 J 聚集的早期阶段，在电子圆二色光谱中检测到一种有趣且持续的负激子效应。通过振动圆二色性检测到的粘土中右旋石英杂质的富集可以解释卟啉组装体中的对称性破坏。因此，我们提出手性卟啉聚集体可以作为检测无机纳米材料中细微手性的创新探针。