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oai:figshare.com:article/34027432 2026-09-29T19:15:29Z category_1 category_4 category_12 category_14 category_15 category_21 category_873 category_39 category_135 portal_63 item_type_6 month_year_09_2026

Turning a Fluorescence Quencher into an Aggregation-Induced Emission Promoter: The Role of Iodide Ions Celin Rooth (25138705) Edamana Prasad (1464166) Biophysics Biochemistry Cell Biology Molecular Biology Neuroscience Biotechnology Chemical Sciences not elsewhere classified Ecology Computational Biology suitable dielectric medium polycyclic aromatic hydrocarbons photophysical analyses revealed facilitates intersystem crossing electroluminescent device fabrication acyl hydrazone linkage aggregated molecular system iodide interacts noncovalently induced enhanced emission induced emission promoter iodide ions aggregation induced emission emission quenching aie promoter molecular packing molecular design iodide ion various fields thf ). subsequently acting significantly enhance significant aggregation quantum yield present study ordered aggregates noncovalent spacer luminescent properties inherent heavy imaging studies first time findings indicate enormous amount atom effect aie luminogens aie luminogen act similarly 40 %) Aggregation-induced emission (AIE)-generating molecules (AIE luminogens) have created an enormous amount of interest in various fields, such as photo- and electroluminescent device fabrication, bio- and chemosensing, imaging studies, and therapeutics. Strategic molecular design plays a critical role in regulating the self-assembly and luminescent properties of the aggregated molecular system. Iodide, owing to its inherent heavy-atom effect, which facilitates intersystem crossing and emission quenching, has never been a part of the molecular design for AIE luminogens. In the present study, the iodide ion is utilized as an AIE promoter to significantly enhance the fluorescence of polycyclic aromatic hydrocarbons (quantum yield (QY) enhancement >40%) by coordinating to an acyl hydrazone linkage of a molecular framework in tetrahydrofuran (THF). Spectroscopic and photophysical analyses revealed that iodide interacts noncovalently with the acyl hydrazone linkage in the framework, leading to the suppression of E–Z isomerism and subsequently acting as a noncovalent spacer that reorganizes the molecular packing into larger and more ordered aggregates, resulting in significant aggregation-induced enhanced emission. The findings indicate for the first time that the iodide ion can act similarly to an AIE luminogen through coordination to an acyl hydrazone molecular linkage in a suitable dielectric medium. 2026-09-29T00:00:00Z Text Journal contribution 10.1021/acs.langmuir.6c05003.s001 https://figshare.com/articles/journal_contribution/Turning_a_Fluorescence_Quencher_into_an_Aggregation-Induced_Emission_Promoter_The_Role_of_Iodide_Ions/34027432 CC BY-NC 4.0