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Electronic and Charge Transport Properties in Bridged versus Unbridged Nanohoops: Role of the Nanohoop Size.
- Source :
-
Chemistry (Weinheim an der Bergstrasse, Germany) [Chemistry] 2023 Jul 20; Vol. 29 (41), pp. e202300934. Date of Electronic Publication: 2023 Jun 01. - Publication Year :
- 2023
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Abstract
- In the field of π-conjugated nanohoops, the size of the macrocycle has a strong impact on its structural characteristics, which in turn affect its electronic properties. In this work, we report the first experimental investigations linking the size of a nanohoop to its charge transport properties, a key property in organic electronics. We describe the synthesis and study of the first example of a cyclocarbazole possessing five constituting building units, namely [5]-cyclo-N-butyl-2,7-carbazole, [5]C-Bu-Cbz. By comparison with a shorter analogue, [4]-cyclo-N-butyl-2,7-carbazole, [4]C-Bu-Cbz, we detail the photophysical, electrochemical, morphological and charge transport properties, highlighting the key role played by the hoop size. In particular, we show that the saturated field effect mobility of [5]C-Bu-Cbz is four times higher than that of its smaller analogue [4]C-Bu-Cbz (4.22×10 <superscript>-5</superscript> vs 1.04×10 <superscript>-5</superscript> cm <superscript>2</superscript> V <superscript>-1</superscript> s <superscript>-1</superscript> ). However, the study of the other organic field-effect transistor characteristics (threshold voltage V <subscript>TH</subscript> and subthreshold slope SS) suggest that a small nanohoop is beneficial for good organization of the molecules in thin films, whereas a large one increases the density of structural defects, and hence of traps for the charge carriers. The present findings are of interest for the further development of nanohoops in electronics.<br /> (© 2023 The Authors. Chemistry - A European Journal published by Wiley-VCH GmbH.)
Details
- Language :
- English
- ISSN :
- 1521-3765
- Volume :
- 29
- Issue :
- 41
- Database :
- MEDLINE
- Journal :
- Chemistry (Weinheim an der Bergstrasse, Germany)
- Publication Type :
- Academic Journal
- Accession number :
- 36994806
- Full Text :
- https://doi.org/10.1002/chem.202300934