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Spin crossover in Fe(triazole)–Pt nanoparticle self-assembly structured at the sub-5 nm scale

Usmani, Suhail and Mikolasek, Mirko and Gillet, Angélique and Sánchez Costa, José and Rigoulet, Mathilde and Chaudret, Bruno and Bousseksou, Azzedine and Lassalle-Kaiser, Benedikt and Demont, Philippe and Molnár, Gábor and Salmon, Lionel and Carrey, Julian and Tricard, Simon Spin crossover in Fe(triazole)–Pt nanoparticle self-assembly structured at the sub-5 nm scale. (2020) Nanoscale, 12 (15). 8180-8187. ISSN 2040-3364

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Official URL: https://doi.org/10.1039/d0nr02154g

Abstract

A main goal of molecular electronics is to relate the performance of devices to the structure and electronic state of molecules. Among the variety of possibilities that organic, organometallic and coordination chemistries offer to tune the energy levels of molecular components, spin crossover phenomenon is a perfect candidate for elaboration of molecular switches. The reorganization of the electronic state population of the molecules associated to the spin crossover can indeed lead to a significant change in conductivity. However, molecular spin crossover is very sensitive to the environment and can disappear once the molecules are integrated into devices. Here, we show that the association of ultra-small 1.2 nm platinum nanoparticles with FeII triazole-based spin crossover coordination polymers leads to self-assemblies, extremely well organized at the sub-3 nm scale. The quasi-perfect alignment of nanoparticles observed by transmission electron microscopy, in addition to specific signature in infrared spectroscopy, demonstrates the coordination of the long-chain molecules with the nanoparticles. Spin crossover is confirmed in such assemblies by X-ray absorption spectroscopic measurements and shows unambiguous characteristics both in magnetic and charge transport measurements. Coordinating polymers are therefore ideal candidates for the elaboration of robust, well-organized, hybrid self-assemblies with metallic nanoparticles, while maintaining sensitive functional properties, such as spin crossover.

Item Type:Article
HAL Id:hal-02570895
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Other partners > European Synchrotron Radiation Facility - ESRF (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
Université de Toulouse > Institut National des Sciences Appliquées de Toulouse - INSA (FRANCE)
Other partners > Synchrotron SOLEIL - SSOLEIL (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE)
Other partners > Universidad Autonoma de Madrid (SPAIN)
Laboratory name:
Funders:
Agence Nationale de la Recherche - ANR - Marie-Curie research program - EUR grant NanoX - Spanish MINECO through National Research Project - Ramon y Cajal Research program
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Deposited On:26 Jun 2020 09:52

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