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

doi:10.1039/d0sc04555a

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 journal › Article › Academic › peer-review

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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 [Fe^III(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 language	English
Pages (from-to)	2381-2388
Number of pages	8
Journal	Chemical science
Volume	12
Issue number	7
DOIs	https://doi.org/10.1039/d0sc04555a
Publication status	Published - 21 Feb 2021

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title = "Room temperature conductance switching in a molecular iron(iii) spin crossover junction",

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.",

author = "Karuppannan, {Senthil Kumar} and Alejandro Mart{\'i}n-Rodr{\'i}guez and Eliseo Ruiz and Phimphaka Harding and Harding, {David J.} and Xiaojiang Yu and Anton Tadich and Bruce Cowie and Dongchen Qi and Nijhuis, {Christian A.}",

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year = "2021",

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doi = "10.1039/d0sc04555a",

language = "English",

volume = "12",

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T1 - Room temperature conductance switching in a molecular iron(iii) spin crossover junction

AU - Karuppannan, Senthil Kumar

AU - Martín-Rodríguez, Alejandro

AU - Ruiz, Eliseo

AU - Harding, Phimphaka

AU - Harding, David J.

AU - Yu, Xiaojiang

AU - Tadich, Anton

AU - Cowie, Bruce

AU - Qi, Dongchen

AU - Nijhuis, Christian A.

PY - 2021/2/21

Y1 - 2021/2/21

N2 - 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.

AB - 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.

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U2 - 10.1039/d0sc04555a

DO - 10.1039/d0sc04555a

M3 - Article

AN - SCOPUS:85101532497

SN - 2041-6520

VL - 12

SP - 2381

EP - 2388

JO - Chemical science

JF - Chemical science

IS - 7

ER -

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

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