Anindita Das

IACS, Kolkata

Anindita Das is an Assistant Professor in the School of Applied and Interdisciplinary Sciences at IACS, Kolkata. She has worked as an Alexander von Humboldt Postdoctoral Fellow at the University of Hamburg, Germany and has done a second postdoctoral stint at Eindhoven University of Technology, The Netherlands. Her research interests include supramolecular assemblies of functional re-systems and macromolecules employing halogen bonding and other underexplored supramolecular interactions, crystallization-driven macromolecular assemblies, and biodegradable polymers. She is the recipient of the Alexander von Humboldt Postdoctoral Fellowship (2014) and the DAE-BRNS Young Scientist Research Award (2022). She is an Early Career Advisory Board Member of ChemNanoMat and Editorial Board Member of the Journal of Macromolecular Science, PartA: Pure andApplied Chemistry. She is a selected Associate of the Indian Academy of Sciences(2022) and of the Indian National Science Academy(2023).

Anindita Das

Session 2A - Lectures by Fellows and Associates

Appa Rao Podile, University of Hyderabad, Hyderabad

Controlled two-dimensional (2D) assemblies from chromophore-appended poly(L-lactides)

Supramolecular assemblies of functional re-conjugated systems are mostly restricted to spherical or one-dimensional structures, with only a few examples of their two-dimensional architectures reported. Crystallization-driven self-assembly (CDSA) of semicrystalline block copolymers (BCPs) has recently emerged as a powerful technique for the fabrication of a wide range of hierarchical anisotropic structures, including 2D architectures. A novel CDSA method for the programmed synthesis of discrete 2D architectures with exciting photophysical properties and predictable morphologies from chromophore- conjugated poly(L-lactides) (PLLAs) will be presented in the talk. PLLA homopolymers, end- functionalized with different dipolar chromophores, crystallize into precise diamond-shaped 2D platelets in isopropanol under suitable conditions. This causes the terminally attached chromophores to assemble into a 2D-array on the platelet surface by either dipole-dipole interactions or aromatic stacking, which leads to aggregation-induced enhanced emission (AIEE) with tunable emission wavelengths within the 2D crystals, depending upon the nature of the end-capped chromophores. The 'living' CDSA method employed to achieve hierarchical segmented block co-platelet structures using one of the homopolymer platelets as the 'seed' and the unimer of the other as the 'monomer reservoir' will be discussed. By incorporating the same donor and acceptor dyes that hold the FRET relationship at the chain ends of the two enantiomers, we were able to monitor the stereo-complex co-platelet formation in the solution phase, whose similar diamond-shaped 2D structure showed enhanced stability as compared to the individual homocrystals.

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