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CC BY-NC-ND 4.0 · Organic Materials 2021; 03(02): 390-404
DOI: 10.1055/a-1534-1508
Focus Issue: Supramolecular Optoelectronic Materials
Original Article

Structure–Assembly–Property Relationships of Simple Ditopic Hydrogen-Bonding-Capable π-Conjugated Oligomers

Asmerom O. Weldeab 
a   Department of Chemistry, University of Florida, PO Box 117200, Gainesville, FL, 32611, United States
,
Cory T. Kornman 
a   Department of Chemistry, University of Florida, PO Box 117200, Gainesville, FL, 32611, United States
,
Lei Li 
a   Department of Chemistry, University of Florida, PO Box 117200, Gainesville, FL, 32611, United States
b   Department of Materials Science and Engineering, Clemson University, Clemson, SC, 29634, United States
,
Daken J. Starkenburg
c   Department of Materials Science and Engineering, University of Florida, PO Box 116400, Gainesville, FL, 32611, United States
,
Xueying Zhao
c   Department of Materials Science and Engineering, University of Florida, PO Box 116400, Gainesville, FL, 32611, United States
,
Danielle E. Fagnani 
a   Department of Chemistry, University of Florida, PO Box 117200, Gainesville, FL, 32611, United States
,
Sara J. Sadovy
c   Department of Materials Science and Engineering, University of Florida, PO Box 116400, Gainesville, FL, 32611, United States
,
Scott S. Perry
c   Department of Materials Science and Engineering, University of Florida, PO Box 116400, Gainesville, FL, 32611, United States
,
Jiangeng Xue 
c   Department of Materials Science and Engineering, University of Florida, PO Box 116400, Gainesville, FL, 32611, United States
,
Ronald K. Castellano 
a   Department of Chemistry, University of Florida, PO Box 117200, Gainesville, FL, 32611, United States
› Author Affiliations Funding Information R. K. C. and J. X. are thankful to the National Science Foundation for supporting this research (CHE-1507561 and CHE-1904534). The mass spectrometric data were obtained by the UF Department of Chemistry Mass Spectrometry Research and Education Center supported, in part, by the National Institutes of Health (NIH S10OD021758-01A1).
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ErrataOrganic Materials 2021; 3(03): e1-e1
DOI: 10.1055/s-0041-1735239

Abstract

A series of simple ditopic hydrogen-bonding-capable molecules functionalized with 2,4-diamino-1,3,5-triazine (DAT), barbiturate (B), and phthalhydrazide (PH) on both termini of a 2,2′-bithiophene linker were designed and synthesized. The intrinsic electronic structures of the ditopic DAT, PH, and B molecules were investigated with ground-state density functional theory calculations. Their solution absorbance was investigated with UV-vis, where it was found that increasing size of R group substituents on the bithiophene linker resulted in a general blue-shift in solution absorbance maximum. The solid-state optical properties of ditopic DAT and B thin films were evaluated by UV-vis, and it was found that the solid-state absorbance was red-shifted with respect to solution absorbance in all cases. The three DAT molecules were vacuum-thermal-deposited onto Au(111) substrates and the morphologies were examined using scanning tunneling microscopy. (DAT-T)2 was observed to organize into six-membered rosettes on the surface, whereas (DAT-TMe)2 formed linear assemblies before and after thermal annealing. For (DAT-Toct)2 , an irregular arrangement was observed, while (B-TMe)2 showed several co-existent assembly patterns. The work presented here provides fundamental molecular–supramolecular relationships useful for semiconductive materials design based on ditopic hydrogen-bonding-capable building blocks.

Key words

conjugated molecules - hydrogen bonding - organic monolayers - optoelectronic properties - self-assembly - supramolecular chemistry

Supporting Information

Synthesis and structural characterization details, absorption data and associated Beer–Lambert plots, post-deposition analysis by NMR, TGA data, additional STM data, and computational details complete with coordinates of geometry-optimized structures.


Supporting Information for this article is available online at https://doi.org/10.1055/a-1534-1508.


Supporting Information



Publication History

Received: 24 May 2021

Accepted: 17 June 2021

Accepted Manuscript online:
22 June 2021

Article published online:
25 August 2021

© 2021. The Author(s). This is an open access article published by Thieme under the terms of the Creative Commons Attribution-NonDerivative-NonCommercial License, permitting copying and reproduction so long as the original work is given appropriate credit. Contents may not be used for commercial purposes, or adapted, remixed, transformed or built upon. (https://creativecommons.org/licenses/by-nc-nd/4.0/)

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