Room-temperature Single-molecule Conductance Switch via Confined Coordination-induced Spin-State Manipulation

Li, Jing and Wu, Qingqing and Xu, Wei and Wang, Hai-Chuan and Zhang, Hewei and Chen, Yaorong and Tang, Yongxiang and Hou, Songjun and Lambert, Colin and Hong, Wenjing (2021) Room-temperature Single-molecule Conductance Switch via Confined Coordination-induced Spin-State Manipulation. CCS Chemistry.

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The emerging of molecular spintronics offers a unique chance for the design of molecular devices with different spin-state, and the control of spin-state becomes essential for molecular spin switches. However, the intrinsic spin switching from low-spin to high-spin state is a temperature-dependent process with a small energy barrier that low temperature is required to maintain the low-spin state, and thus the room-temperature operation of single-molecule devices have not yet been achieved. Here, we present a reversible single-molecule conductance switch by manipulating the spin states of the molecule at room temperature using the scanning tunneling microscope break-junction (STM-BJ) technique. The manipulation of the spin states between S = 0 and S = 1 is achieved by complexing or decomplexing the pyridine derivative molecule with the square planar nickel(II) porphyrin. The bias-dependent conductance evolution proved that the strong electric field between the nanoelectrodes plays a crucial role in the coordination reaction. The DFT calculations further revealed that the conductance changes come from the geometry change of the porphyrin ring and spin-state switching of Ni(II) ion. Our work provides a new avenue to investigate room-temperature spin-related sensors and molecular spintronics.

Item Type:
Journal Article
Journal or Publication Title:
CCS Chemistry
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21 Jun 2021 14:50
Last Modified:
20 Sep 2023 01:43