Complete set of elastic moduli of a spin-crossover solid: Spin-state dependence and mechanical actuation

Mirko Mikolasek; Maria D. Manrique-Juarez; H. J. Shepherd; Karl Ridier; Sylvain Rat; Victoria Shalabaeva; Alin-Ciprian Bas; Ines E. Collings; Fabrice Mathieu; Jean Cacheux; Thierry Leichle; Liviu Nicu; W. Nicolazzi; L. Salmon; G. Molnar; A. Bousseksou

doi:10.1021/jacs.8b05347

Complete set of elastic moduli of a spin-crossover solid: Spin-state dependence and mechanical actuation

Mirko Mikolasek ¹ Maria D. Manrique-Juarez ^{2, 3, 4} H. J. Shepherd ⁵ Karl Ridier ^{2, 3} Sylvain Rat ^{2, 3} Victoria Shalabaeva ^{2, 3} Alin-Ciprian Bas ^{2, 3} Ines E. Collings ¹ Fabrice Mathieu ⁶ Jean Cacheux ⁷ Thierry Leichle ⁷ Liviu Nicu ⁷ W. Nicolazzi ^{2, 3} L. Salmon ² G. Molnar ² A. Bousseksou ²

1 ESRF - European Synchrotron Radiation Facility

2 LCC - Laboratoire de chimie de coordination

3 UT3 - Université Toulouse III - Paul Sabatier

4 LAAS - Laboratoire d'analyse et d'architecture des systèmes

5 School of Physical Sciences, University of Kent

6 LAAS-I2C - Service Instrumentation Conception Caractérisation

LAAS - Laboratoire d'analyse et d'architecture des systèmes

7 LAAS-MEMS - Équipe Microsystèmes électromécaniques

LAAS - Laboratoire d'analyse et d'architecture des systèmes

Abstract : Mol. spin crossover complexes are promising candidates for mech. actuation purposes. The relationships between their crystal structure and mech. properties remain, however, not well understood. In this study, combining high pressure synchrotron X-ray diffraction, nuclear inelastic scattering, and micromech. measurements, we assessed the effective macroscopic bulk modulus (B = 11.5 ± 1.5 GPa), Young's modulus (Y = 10.9 ± 1.0 GPa), and Poisson's ratio (ν = 0.34 ± 0.04) of the spin crossover complex [FeII(HB(tz)3)2] (tz = 1,2,4-triazol-1-yl). Crystal structure anal. revealed a pronounced anisotropy of the lattice compressibility, which was correlated with the difference in spacing between the mols. as well as by the distribution of the stiffest C-H···N interactions in different crystallog. directions. Switching the mols. from the low spin to the high spin state leads to a remarkable drop of the Young's modulus to 7.1 ± 0.5 GPa both in bulk and thin film samples. The results highlight the application potential of these films in terms of strain (ε = -0.17 ± 0.05%), recoverable stress (σ = -21 ± 1 MPa), and work d. (W/V = 15 ± 6 mJ/cm3).

Document type :

Journal articles

Domain :

Chemical Sciences / Coordination chemistry

Complete list of metadatas

https://hal.archives-ouvertes.fr/hal-01961781
Contributor : Marie-Hélène Gulli <>
Submitted on : Thursday, December 20, 2018 - 10:58:16 AM
Last modification on : Friday, January 10, 2020 - 9:10:19 PM

Complete set of elastic moduli of a spin-crossover solid: Spin-state dependence and mechanical actuation

Identifiers

Collections

Citation

Export

Metrics

68

CONTACT

Complete set of elastic moduli of a spin-crossover solid: Spin-state dependence and mechanical actuation

Identifiers

Collections

Citation

Export

Share

Metrics

68

CONTACT