Journal
NANOSCALE
Volume 11, Issue 28, Pages 13233-13242Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9nr04593g
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Funding
- Department of Electronics & Information Technology, DeitY Project [5(9)/2012-NANO]
- Department of Science and Technology (DST) [DST/SERB/EMR/2014/000034]
- DST-Max Planck Society, Germany [IGSTC/MPG/PG(PKI)/2011A/48]
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Engineering well-defined supramolecular fluorescent nano-architectures based on organic conjugated small molecules has been an essential scientific challenge. Herein, a library of sixteen naphthalimide congeners (1-15 and HNI) has been strategically designed that unveils a conceptual insight into the functional group controlled condensed state emission and aggregation-induced enhanced emission (AIEE) in conventional strong aggregation-caused quenching (ACQ) active fluorophores. Along with the regulation of ACQ-to-AIEE transformation and tailoring of the condensed state emission, a simple yet potential design strategy of functional group engineering has been established for the first time to spontaneously generate and systematically tailor the supramolecular self-assembly of organic small molecules into highly defined nano-architectures. Single-crystal XRD analysis of six congeners revealed that, unlike the well-established electronic contribution of the functional groups in the molecularly dispersed state, the condensed state photophysical and morphological properties are dictated by the distinct intermolecular pi-pi stacking interaction of the planar aromatic core. This work demonstrates an unconventional influence of the functional motif in the condensed state that could emerge as a promising route to build a fluorescent supramolecular nanoassembly from non-fluorescent conjugated molecules for a variety of future applications.
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