Issue 24, 2023

Sublimable complexes with spin switching: chemical design, processing as thin films and integration in graphene-based devices

Abstract

Among the different types of switchable molecular compounds, sublimable Fe(II) SCO molecules provide a suitable platform to develop smart devices that respond to external stimuli. Herein, we report the synthesis, crystallographic structure and magnetic properties of three new neutral Fe(II) SCO molecules belonging to the {Fe[H2B(pz)2]2(L)} family with bidentate-α-diimine ligands L = 3-(pyridin-2-yl)-[1,2,3]triazolo[1,5-a]pyridine (tzpy), 5,5′,6,6′-tetrahydro-4H,4′H-2,2′-bi(1,3-thiazine) (btz) and 4,4′,5,5′-tetrahydro-2,2′-bithiazole (bt) (1, 2 and 3, respectively), as well as two solvated forms of 1 and 3. All three desolvated compounds present thermal- and light-induced SCO transitions with different degrees of cooperativity and effectiveness. Furthermore, 1 and 2 are demonstrated to be sublimable under HV conditions, affording homogeneous thin films 200 nm thick (TF1 and TF2) that retain the chemical integrity of the original molecules regardless of the deposition surface. The SCO behaviour of the films is characterized by the XAS technique revealing the partial retainment of both thermal- and light-induced spin transitions, yet losing the cooperativity. Finally, SCO/2D horizontal hybrid devices based on CVD-graphene are produced using these films. Being the first ones of this type utilizing molecules of the {Fe[H2B(pz)2]2(L)} family, with L = tzpy and btz, the devices have allowed the successful detection of the thermal SCO transition through the electric properties of CVD-graphene.

Graphical abstract: Sublimable complexes with spin switching: chemical design, processing as thin films and integration in graphene-based devices

Supplementary files

Article information

Article type
Paper
Submitted
29 sep 2022
Accepted
30 nov 2022
First published
02 dec 2022

J. Mater. Chem. C, 2023,11, 8107-8120

Sublimable complexes with spin switching: chemical design, processing as thin films and integration in graphene-based devices

M. Gavara-Edo, F. J. Valverde-Muñoz, R. Córdoba, M. C. Muñoz, J. Herrero-Martín, J. A. Real and E. Coronado, J. Mater. Chem. C, 2023, 11, 8107 DOI: 10.1039/D2TC04120K

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