Volume 21, Issue 9 2411201
Research Article

Decoding Framework Dynamics in a Spin Crossover Flexible Metal–Organic Framework

Ana Martinez-Martinez

Ana Martinez-Martinez

IMDEA Nanociencia, C/ Faraday 9, Madrid, 28049 Spain

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Jorge Albalad

Jorge Albalad

Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and The Barcelona Institute of Science and Technology, Campus UAB, Bellaterra, Barcelona, 08193 Spain

Departament de Química, Facultat de Ciències, Universitat Autònoma de Barcelona, Bellaterra, Barcelona, 08193 Spain

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Esther Resines-Urien

Esther Resines-Urien

IMDEA Nanociencia, C/ Faraday 9, Madrid, 28049 Spain

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E. Carolina Sañudo

Corresponding Author

E. Carolina Sañudo

Departament de Química Inorgànica i Orgànica, Secció de Química Inorgànica, Universidad de Barcelona, C/Martí i Franqués 1–11, Barcelona, 08028 Spain

IN2UB Institute de Nanociencia i Nanotecnologia, Universitat de Barcelona C/Marti i Franques 1-11, Barcelona, 08028 Spain

E-mail: [email protected]; [email protected]; [email protected]

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A. Lorenzo Mariano

A. Lorenzo Mariano

CNRS, SIMAP, Univ. Grenoble Alpes, Grenoble, 38000 France

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Oscar Fabelo

Oscar Fabelo

Institut Laue-Langevin, 6 rue Jules Horowitz, BP 156, Grenoble, Cedex 938042 France

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Jose Alberto Rodríguez-Velamazán

Jose Alberto Rodríguez-Velamazán

Institut Laue-Langevin, 6 rue Jules Horowitz, BP 156, Grenoble, Cedex 938042 France

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Roberta Poloni

Corresponding Author

Roberta Poloni

CNRS, SIMAP, Univ. Grenoble Alpes, Grenoble, 38000 France

E-mail: [email protected]; [email protected]; [email protected]

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Daniel Maspoch

Daniel Maspoch

Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and The Barcelona Institute of Science and Technology, Campus UAB, Bellaterra, Barcelona, 08193 Spain

Departament de Química, Facultat de Ciències, Universitat Autònoma de Barcelona, Bellaterra, Barcelona, 08193 Spain

ICREA, Pg. Lluís Companys 23, Barcelona, 08010 Spain

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José Sánchez Costa

Corresponding Author

José Sánchez Costa

IMDEA Nanociencia, C/ Faraday 9, Madrid, 28049 Spain

E-mail: [email protected]; [email protected]; [email protected]

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First published: 03 February 2025

Abstract

Functional spin crossover (SCO) metal–organic frameworks (MOFs) hold promise for miniaturized spin-based devices due to their tuneable molecule-based properties near room temperature. SCO describes the phenomenon where transition metal ions switch between high spin (HS) and low spin (LS) states upon external stimuli. However, even simple guest molecules like water can significantly alter the properties of these materials. Understanding the interplay between SCO and these molecules is therefore crucial. This work investigates this interplay in a fascinating 3D Fe(II) SCO-MOF, recently reported to exhibit reversible conductivity even in bulk. A combined experimental and computational approach is employed to explore how guest molecule uptake/release influences SCO dynamics including a transition from partial HS/LS to a fully LS state at high temperatures, (named reverse SCO) and ligand disorder-order behavior. The findings reveal a solid-state mechanism that differs from those previously described.

Conflict of Interest

The authors declare no conflict of interest.

Data Availability Statement

The data that support the findings of this study are available in the supplementary material of this article.

The full text of this article hosted at iucr.org is unavailable due to technical difficulties.