ArticleThe journal of physical chemistry. B2026
Discovery of Crystallized and Weakly Coupled Aggregates of Pseudocyanine Iodide.
Article in The journal of physical chemistry. B, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
We present a new class of pseudocyanine iodide (PIC-I) aggregates formed by freeze-induced self-assembly into layered ribbon structures. Unlike conventional PIC J-aggregates with head-to-tail dipole alignment, these ribbons adopt a complex and mixed HJ-aggregate arrangement. Unexpectedly, the aggregate ribbons exhibit intense, red-shifted fluorescence, in contrast to the typical nonemissive nature of their monomer form. At 4 K, their emission lifetimes range from ∼300 ps to ∼1 ns, substantially longer than those of J-aggregates. The combination of red-shifted emission, monomer-like absorption, and extended lifetimes reveals their mixed packing contributions. Second-order autocorrelation measurements with a Hanbury Brown and Twiss interferometer show photon bunching, providing evidence for cooperative emission from collective excitonic states─an effect not previously observed in any aggregates larger than dimers. These findings establish PIC-I HJ-aggregate ribbons as a unique platform for exploring collective photophysics in mixed aggregate molecular assemblies, suggesting potential applications in bioimaging, light-emitting devices, and sensing.
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