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Issue 8, 2020
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A twist in the non-slanted H-mers to control π-conjugation in 2-dimensions and optical properties

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Abstract

Understanding the structural parameters that determine the extension of π-conjugation in 2-dimensions is key for controlling the optical, photophysical, and electronic properties of 2D-π-conjugated materials. In this article, three non-slanted H-mers including a donor–acceptor H-mer (H-mer-3) with an increase in dihedral angle (twist) between the strands and rungs are synthesized and studied. These non-slanted H-mers represent the repeat units of 2D-π-conjugated materials. H-mer-3, containing donor-strands and an acceptor-rung, is an unexplored donor–acceptor architecture in both slanted and non-slanted H-mers. The H-mers displayed both acid and base dependent optical properties. While the rungs have a little impact on the H-mer absorption spectra they play a key role in the emission and fluorescence lifetime. H-mer-3 (i.e., donor–acceptor H-mer) shows a higher Stokes shift and fluorescence lifetime than the other two H-mers. The twist and the presence of an electron deficient rung in H-mer-3 facilitated an intramolecular charge transfer in the excited state from the strands to the electron deficient rung, and therefore control over the H-mer emission properties. The lack of insulating pendant chains, reduced π–π interactions in thinfilms, and longer fluorescence lifetimes make these H-mers interesting candidates for various electronic and optoelectronic applications.

Graphical abstract: A twist in the non-slanted H-mers to control π-conjugation in 2-dimensions and optical properties

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Supplementary files

Article information


Submitted
17 Jun 2020
Accepted
19 Oct 2020
First published
19 Oct 2020

This article is Open Access

Mater. Adv., 2020,1, 2917-2925
Article type
Paper

A twist in the non-slanted H-mers to control π-conjugation in 2-dimensions and optical properties

M. K. Das, F. Hameed, R. Lillis and N. Gavvalapalli, Mater. Adv., 2020, 1, 2917
DOI: 10.1039/D0MA00424C

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