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Tailoring exciplex formation in metal-induced supramolecular organization.

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Title: Tailoring exciplex formation in metal-induced supramolecular organization.
Authors: Le-Hoang, Giau1 (AUTHOR), Guénée, Laure2 (AUTHOR), Piguet, Claude1 (AUTHOR) claude.piguet@unige.ch
Source: Dalton Transactions: An International Journal of Inorganic Chemistry. 6/9/2026, Vol. 55 Issue 22, p8481-8488. 8p.
Subjects: Supramolecular chemistry, Stacking interactions, Photoexcitation, Intermolecular interactions, Rare earth metals, Molecular interactions, Ligands (Chemistry), Polarity (Chemistry)
Abstract: The intramolecular π-polarization induced upon binding the bichromophoric ligand L1 to lanthanide ions produces intermolecular hetero-π-stacked pyrene–terimine organization in the resulting complexes as ascertained by ground state supramolecular aggregations leading to dimeric [ L1 Ln(hfac)3]2 (Ln = Y, Eu) units both in the solid state (X-ray crystal structure determination) and in dichloromethane solution (1H NMR titrations). Photoexcitation engenders additional polarization changes which further complicate/extend interaromatic aggregation processes via the formation of light-driven excimers and exciplexes. The various π-stacking intermolecular interactions operating in the [ L1 Y(hfac)3] host are probed by reaction with three competitive aromatics guests: electron-poor nitrobenzene, neutral benzene and electron-rich methoxybenzene. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
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Abstract:The intramolecular π-polarization induced upon binding the bichromophoric ligand L1 to lanthanide ions produces intermolecular hetero-π-stacked pyrene–terimine organization in the resulting complexes as ascertained by ground state supramolecular aggregations leading to dimeric [ L1 Ln(hfac)3]2 (Ln = Y, Eu) units both in the solid state (X-ray crystal structure determination) and in dichloromethane solution (1H NMR titrations). Photoexcitation engenders additional polarization changes which further complicate/extend interaromatic aggregation processes via the formation of light-driven excimers and exciplexes. The various π-stacking intermolecular interactions operating in the [ L1 Y(hfac)3] host are probed by reaction with three competitive aromatics guests: electron-poor nitrobenzene, neutral benzene and electron-rich methoxybenzene. [ABSTRACT FROM AUTHOR]
ISSN:14779226
DOI:10.1039/d6dt00490c