Room temperature conductance switching in a molecular iron(iii) spin crossover junction

Karuppannan, SK; Martín-Rodríguez, A; Ruiz, E; Harding, P; Harding, DJ; Yu, X; Tadich, Anton; Cowie, B; Qi, Dongchen; Nijhuis, CA

doi:10.26181/6098d7e07cf6b

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Room temperature conductance switching in a molecular iron(iii) spin crossover junction

journal contribution

posted on 2021-05-10, 06:51 authored by SK Karuppannan, A Martín-Rodríguez, E Ruiz, P Harding, DJ Harding, X Yu, Anton TadichAnton Tadich, B Cowie, Dongchen QiDongchen Qi, CA Nijhuis

Herein, we report the first room temperature switchable Fe(iii) molecular spin crossover (SCO) tunnel junction. The junction is constructed from [Fe (qsal-I) ]NTf (qsal-I = 4-iodo-2-[(8-quinolylimino)methyl]phenolate) molecules self-assembled on graphene surfaces with conductance switching of one order of magnitude associated with the high and low spin states of the SCO complex. Normalized conductance analysis of the current-voltage characteristics as a function of temperature reveals that charge transport across the SCO molecule is dominated by coherent tunnelling. Temperature-dependent X-ray absorption spectroscopy and density functional theory confirm the SCO complex retains its SCO functionality on the surface implying that van der Waals molecule—electrode interfaces provide a good trade-off between junction stability while retaining SCO switching capability. These results provide new insights and may aid in the design of other types of molecular devices based on SCO compounds. III 2 2

Funding

We gratefully acknowledge the support of the Thailand Research Fund (BRG6180008) in funding this research. P.H. thanks the Office of National Higher Education Science Research and Innovation Policy Council for additional funding (PMUB-B05F630101). This work had Financial Support by the Ministerio de Ciencia e Innovacion through grant PGC2018-093863-B-C21 and MDM-2017-0767 and Generalitat de Catalunya with the grant SGR2017-1289. E.R. thanks Generalitat de Catalunya for his ICREA Academia grant. A.M.R. thanks Ministerio de Ciencia e Innovacion for a predoctoral FPI fellowship. We thank the BSC for computational resources, technical expertise, and assistance. We express thanks to the Ministry of Education singapore for supporting this research (award no. MOE2018-T2-1-088), and the Prime Minister's Office, Singapore, under its Medium-Sized Centre program. We kindly acknowledge the Singapore Synchrotron Light Source (SSLS) supporting our experiments at the SINS beamline under NUS core support C-380-003-003-001. We would like to acknowledge Soft X-ray (SXR) Beamline at the Australian Synchrotron.

History

Publication Date

2021-02-21

Journal

Chemical Science

Volume

12

Issue

7

Article Number

2381

Pagination

(p. 2381-2388)

Publisher

Royal Society of Chemistry

ISSN

2041-6520

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