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

Senthil Kumar Karuppannan, Alejandro Martín-Rodríguez, Eliseo Ruiz*, Phimphaka Harding, David J. Harding, Xiaojiang Yu, Anton Tadich, Bruce Cowie, Dongchen Qi, Christian A. Nijhuis

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

32 Citations (Scopus)
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Abstract

Herein, we report the first room temperature switchable Fe(iii) molecular spin crossover (SCO) tunnel junction. The junction is constructed from [FeIII(qsal-I)2]NTf2(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.

Original languageEnglish
Pages (from-to)2381-2388
Number of pages8
JournalChemical science
Volume12
Issue number7
DOIs
Publication statusPublished - 21 Feb 2021

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