Organobismuth Molecular Crystals for Organic Topological Insulators

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Title
Organobismuth Molecular Crystals for Organic Topological Insulators
Author(s)
Soyoung Kim; Jinyoung Koo; Hee Cheul Choi
Publication Date
2018-10
Journal
ACS APPLIED NANO MATERIALS, v.1, no.10, pp.5419 - 5424
Publisher
AMER CHEMICAL SOC
Abstract
Three different types of large and high-quality organobismuth molecular crystals were grown by a physical vapor transport process. The target organobismuth molecules that have similar molecular structures, except for the type and position of the functional group, were crystallized into colorless and wire-shaped crystals having lengths at the centimeter scale with uniform flat surface. The crystal-packing structures of the organobismuth crystals were determined by single-crystal X-ray diffraction. The results show that the molecular packing can be controlled by a slight change of the functional group due to their different intermolecular interactions. Especially, the Bi−Bi distance was successfully controlled to vary from 5.11(1) to 5.71(3) and 5.18(2) Å for triphenylbismuth (TPB), tri-p-tolylbismuthine (p-TTB), and tri-o-tolylbismuthine (o-TTB), respectively. The different crystal structures and Bi−Bi distances can affect the topological behavior of the materials. Moreover, the electrical and optical properties of the target organobismuth crystals were confirmed through the I−V characteristics, density functional theory calculation, and photoluminescence spectroscopy. These findings potentially offer a new route and strategy for the development of organic topological insulators.© 2018 American Chemical Society
URI
https://pr.ibs.re.kr/handle/8788114/5777
ISSN
2574-0970
Appears in Collections:
Center for Artificial Low Dimensional Electronic Systems(원자제어 저차원 전자계 연구단) > Journal Papers (저널논문)
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