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Krishna VS, Samanta M, Pal S, et al. Light-triggered assembly-disassembly of an ordered donor-acceptor π-stack using a photoresponsive dimethyldihydropyrene π-switch. Org Biomol Chem. 2016;14(24):5744-50doi: 10.1039/c6ob00101g.
Krishna, V. S., Samanta, M., Pal, S., Anurag, N. P., & Bandyopadhyay, S. (2016). Light-triggered assembly-disassembly of an ordered donor-acceptor π-stack using a photoresponsive dimethyldihydropyrene π-switch. Organic & biomolecular chemistry, 14(24), 5744-50. https://doi.org/10.1039/c6ob00101g
Krishna, V Siva Rama, et al. "Light-triggered assembly-disassembly of an ordered donor-acceptor π-stack using a photoresponsive dimethyldihydropyrene π-switch." Organic & biomolecular chemistry vol. 14,24 (2016): 5744-50. doi: https://doi.org/10.1039/c6ob00101g
Krishna VS, Samanta M, Pal S, Anurag NP, Bandyopadhyay S. Light-triggered assembly-disassembly of an ordered donor-acceptor π-stack using a photoresponsive dimethyldihydropyrene π-switch. Org Biomol Chem. 2016 Jun 28;14(24):5744-50. doi: 10.1039/c6ob00101g. Epub 2016 Feb 22. PMID: 26899505.
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Org Biomol Chem. 2016 Jun 28;14(24):5744-50. doi: 10.1039/c6ob00101g. Epub 2016 Feb 22.

Light-triggered assembly-disassembly of an ordered donor-acceptor π-stack using a photoresponsive dimethyldihydropyrene π-switch.

Organic & biomolecular chemistry

V Siva Rama Krishna, Mousumi Samanta, Suman Pal, N P Anurag, Subhajit Bandyopadhyay

Affiliations

  1. Department of Chemical Sciences, Indian Institute of Science Education and Research (IISER) Kolkata, Nadia, WB 741246, India. [email protected].

PMID: 26899505 DOI: 10.1039/c6ob00101g

Abstract

Self-organization of donor and acceptor π-systems forms alternate D-A stacks of the donor and acceptor molecules. Using a photochromic π-switch as a donor and an electron deficient acceptor dye such stacks were formed. Photomodulation of the donor unit with visible light led to a photoisomerized state having a non-planar structure with reduced donor ability, thereby causing destruction of the alternate D-A π-stacks. The formation and destruction of the stacks were studied by various spectroscopy methods. Both the stacks and the depleted stacks were studied by DLS and SEM experiments. The regeneration of the stacks occurred in solution with the reversal of the photoisomerization process with ultraviolet light. Computational and differential scanning calorimetric studies validated the thermodynamics of the formation of the stacks. This work presents a reversible assembly-disassembly of a donor-acceptor π system devoid of additional auxiliary non-covalent bonding motifs in the donor and acceptor molecules.

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