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Non-Pinned and Reversible Spin Crossover in Self-Assembled Monolayers of a Functionalized Fe(II) Scorpionate Complex
Rebecca Rodrigues de Miranda1, Niccolò Giaconi2, Margaux Pénicaud1
1Université de Bordeaux, CNRS, Bordeaux INP ICMCB, UMR 5026, F-33600 Pessac, France.
This study demonstrates solution-processed self-assembled monolayers (SAMs) of spin crossover (SCO) molecules on gold. This method enables reversible, non-pinned SCO behavior, crucial for molecular electronics.
Area of Science:
- Materials Science
- Supramolecular Chemistry
- Surface Science
Background:
- Spin crossover (SCO) behavior in molecular monolayers can be hindered by substrate interactions, limiting device applications.
- Processing SCO films from sublimation is restricted due to solvent reactivity.
Purpose of the Study:
- To develop a method for preparing SCO monolayers with preserved SCO properties.
- To enable the use of SCO compounds in switchable molecular electronic systems.
Main Methods:
- Preparation of self-assembled monolayers (SAMs) from solution.
- Characterization using atomic force microscopy (AFM), time-of-flight secondary ion mass spectrometry (ToF-SIMS), FTIR-RAS, and X-ray photoelectron spectroscopy (XPS).
- Electrochemical and spectroscopic analysis (cyclic voltammetry, variable temperature XPS/XAS) to confirm SCO behavior.
Main Results:
- Successfully formed chemisorbed SAMs of an Fe(II) SCO complex on gold substrates.
- Demonstrated reversible, non-pinned SCO behavior in the monolayers, consistent with bulk material.
- Confirmed Fe(II)/Fe(III) redox activity and dense surface coverage.
Conclusions:
- Solution-based assembly of SCO monolayers is feasible while maintaining reversible SCO properties.
- These SCO monolayers are suitable for applications in switchable molecular electronics.
- Overcoming substrate-induced quenching is key for SCO device development.
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