De Novo Circularly Polarized Emission and Greatly Enhanced Circular Dichroism in Cationic Naphthalene Diimide Dye Supramolecular Assembly on 2-D Laponite Nanoclay
8 affiliations
- 1Department of Chemistry and The Institute for Lasers, Photonics and Biophotonics
- 2University at Buffalo (SUNY
- 3Department of Chemical Sciences
- 4Indian Institute of Science Education and Research (IISER
- 5Air Force Research Laboratory
- 6Materials and Manufacturing Directorate
- 7Department of Chemical Engineering
- 8Indian Institute of Technology Kanpur
Abstract
This study reveals a surprising finding that a chiral cationic pyrrolidine-substituted naphthalene diimide (cNDI-Py + ), which shows no circular dichroism (CD) or circularly polarized luminescence (CPL) in its monomeric form, exhibits strong CD and broad, intense CPL when electrostatically bound to a 2D synthetic laponite nanoclay nanoplatelet (cNDI-Py + _Laponite) in an aqueous environment. This supramolecular alignment of the electrostatically anchored dye on laponite platelets leads to a chiral assembly that produces distinctive chiral excimer emission, stemming from an excited-state slip-stacked arrangement of preorganized dye molecules. The new hybrid emission band at 480 nm comes from the excited cNDI-Py+_Laponite assembly, as evidenced by a high quantum yield (Φ) of 0.40, luminescence dissymmetry (g lum ) of -0.013, and an outstanding CPL brightness of 88 M -1 cm -1 . We demonstrate that chiral dye-nanoclay assemblies serve as an underused platform for excimer-based CPL by nanoscale confinement of dye molecules. Bright circularly polarized emissions can play an important role in establishing experimental space-to-ground telecommunication links, enabling full-color 3D holographic displays, and supporting other applications that rely on chiral control of light-matter interactions. This approach provides oxygen-tolerant control with inorganic templates, enabling enantioselective excimer emission and opening new paths for CPL-active materials.
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BibTeX
@misc{joseph2026novo,
title = {{De Novo Circularly Polarized Emission and Greatly Enhanced Circular Dichroism in Cationic Naphthalene Diimide Dye Supramolecular Assembly on 2-D Laponite Nanoclay}},
author = {Jojo P. Joseph and Subhankar Paul and Sonal Gupta and Evgenii Oskolkov and Guang S. He and Alexander Baev and Richard A. Vaia and Yogesh M. Joshi and Debangshu Chaudhuri and Paras N. Prasad},
howpublished = {ChemRxiv},
year = {2026},
month = oct,
doi = {10.26434/chemrxiv.15010509/v1},
url = {https://chemrxiv.org/doi/full/10.26434/chemrxiv.15010509/v1},
note = {CC BY},
}
RIS
TY - UNPB
TI - De Novo Circularly Polarized Emission and Greatly Enhanced Circular Dichroism in Cationic Naphthalene Diimide Dye Supramolecular Assembly on 2-D Laponite Nanoclay
AU - Jojo P. Joseph
AU - Subhankar Paul
AU - Sonal Gupta
AU - Evgenii Oskolkov
AU - Guang S. He
AU - Alexander Baev
AU - Richard A. Vaia
AU - Yogesh M. Joshi
AU - Debangshu Chaudhuri
AU - Paras N. Prasad
PY - 2026
DA - 2026/10/15
PB - ChemRxiv
DO - 10.26434/chemrxiv.15010509/v1
UR - https://chemrxiv.org/doi/full/10.26434/chemrxiv.15010509/v1
AB - This study reveals a surprising finding that a chiral cationic pyrrolidine-substituted naphthalene diimide (cNDI-Py + ), which shows no circular dichroism (CD) or circularly polarized luminescence (CPL) in its monomeric form, exhibits strong CD and broad, intense CPL when electrostatically bound to a 2D synthetic laponite nanoclay nanoplatelet (cNDI-Py + _Laponite) in an aqueous environment. This supramolecular alignment of the electrostatically anchored dye on laponite platelets leads to a chiral assembly that produces distinctive chiral excimer emission, stemming from an excited-state slip-stacked arrangement of preorganized dye molecules. The new hybrid emission band at 480 nm comes from the excited cNDI-Py+_Laponite assembly, as evidenced by a high quantum yield (Φ) of 0.40, luminescence dissymmetry (g lum ) of -0.013, and an outstanding CPL brightness of 88 M -1 cm -1 . We demonstrate that chiral dye-nanoclay assemblies serve as an underused platform for excimer-based CPL by nanoscale confinement of dye molecules. Bright circularly polarized emissions can play an important role in establishing experimental space-to-ground telecommunication links, enabling full-color 3D holographic displays, and supporting other applications that rely on chiral control of light-matter interactions. This approach provides oxygen-tolerant control with inorganic templates, enabling enantioselective excimer emission and opening new paths for CPL-active materials.
ER -