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Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR) Bengaluru 
Self Assembly of Naphthalene Diimide Derivatives and Process Thereof  
Govindaraju Thimmaiah, Manjula Basavanna Avinash, Makam Pandeeswar 
Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR) Bengaluru 
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Granted - 2018-02-27 
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Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR) Bengaluru 
The chemistry of molecular assemblies involves weaker yet complex noncovalent interactions. The molecular organization of the π-conjugated material is crucial in determining the performance of an organic electronic device. Herein we demonstrate a bioinspired design strategy to tune the self-assembly of naphthalenediimides (NDIs) by minute structural variations, π-π stacking, hydrophobic interactions and metal coordination. We address some of the limitations associated with current design strategies like restriction to a specific molecular interaction or the difficulty in controlling the assembly due to several complicated intermolecular interactions. Hydrophobic effect induced J-type aggregation and sodium coordination induced H-type aggregation of tryptophan appended NDIs has been illustrated. H NMR spectra further reveals sodium cation-π interactions in tryptophan appended NDIs. NMR and IR spectroscopic studies confirm the structural variations associated with molecular assembly. The molecular organization has been successfully transformed from nanospheres to particles, nanobelts, fibers and fractals. Strikingly, such drastic changes in the morphology are a clear evidence of the importance of the nontrivial weak noncovalent forces. 

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