A reversible hydrogen‐bond isomerization triggered by an abrupt spin crossover near room temperature

Jornet-Mollá, Verónica; Giménez-Saiz, Carlos; Yufit, Dmitry S.; Howard, Judith A.K.; Romero, Francisco M.

doi:10.1002/chem.202003654

A reversible hydrogen‐bond isomerization triggered by an abrupt spin crossover near room temperature

Jornet-Mollá, Verónica; Giménez-Saiz, Carlos; Yufit, Dmitry S.; Howard, Judith A.K.; Romero, Francisco M.

Authors

Verónica Jornet-Mollá

Carlos Giménez-Saiz

Dr Dmitry Yufit d.s.yufit@durham.ac.uk
Academic Visitor

Judith A.K. Howard

Francisco M. Romero

Abstract

The spin crossover salt [Fe(bpp) 2 ](isonicNO) 2 ·2.4H 2 O ( 1 ·2.4H 2 O) (bpp = 2,6‐bis(pyrazol‐3‐yl)pyridine; isonicNO = isonicotinate N‐oxide anion) exhibits a very abrupt spin crossover at T 1 /2 = 274.4 K. This triggers a supramolecular linkage (H‐bond) isomerization that responds reversibly towards light irradiation or temperature change. Isotopic effects in the thermomagnetic behaviour reveal the importance of hydrogen bonds in defining the magnetic state. Further, the title compound can be reversibly dehydrated to afford 1 , a material that also exhibits spin crossover coupled to H‐bond isomerization, leading to strong kinetic effects in the thermomagnetic properties.

Citation

Jornet-Mollá, V., Giménez-Saiz, C., Yufit, D. S., Howard, J. A., & Romero, F. M. (2021). A reversible hydrogen‐bond isomerization triggered by an abrupt spin crossover near room temperature. Chemistry - A European Journal, 27(2), 740-750. https://doi.org/10.1002/chem.202003654

Journal Article Type	Article
Acceptance Date	Aug 17, 2020
Online Publication Date	Nov 27, 2020
Publication Date	Jan 7, 2021
Deposit Date	Aug 25, 2020
Publicly Available Date	Nov 27, 2021
Journal	Chemistry - A European Journal
Print ISSN	0947-6539
Electronic ISSN	1521-3765
Publisher	Wiley
Peer Reviewed	Peer Reviewed
Volume	27
Issue	2
Pages	740-750
DOI	https://doi.org/10.1002/chem.202003654

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Copyright Statement
This is the peer reviewed version of the following article: Jornet-Mollá, Verónica, Giménez-Saiz, Carlos, Yufit, Dmitry S., Howard, Judith A. K. & Romero, Francisco M. (2021). A reversible hydrogen‐bond isomerization triggered by an abrupt spin crossover near room temperature. Chemistry - A European Journal 27(2): 740-750., which has been published in final form at https://doi.org/10.1002/chem.202003654. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions.