Non-Pinned and Reversible Spin Crossover in Self-Assembled Monolayers of a Functionalized Fe(II) Scorpionate Complex
Year: 2025
Type: article
Abstract: Spin crossover (SCO) in (sub)monolayers is typically altered from that in the bulk: in particular, the SCO can be quenched by direct contact between the SCO molecules and the substrate, causing problems for potential device applications. Here, an Fe (II) complex is presented that exhibits fully reversible, non-quenched SCO in self-assembled monolayers (SAMs) on template stripped gold substrates. The complex, [Fe(Tp(4-NHCOC10H20SCOCH3))(Tp)] where Tp = tris(1H-pyrazol-1-yl borohydride), has a broad SCO with a T½ of 366 K. The SAMs are uniform and homogeneous, as indicated by Atomic Force Microscopy, and contain the target molecules in a well-oriented layer with the expected thickness for a monolayer of the complex, as revealed by Polarization Modulation Infrared Reflection-Absorption Spectroscopy, Time-of-Flight Secondary Ion Mass Spectrometry and Cyclic Voltammetry. Variable temperature X-ray Photoelectron Spectroscopy, as well as X-ray Absorption Spectroscopy at the Fe L2,3 edges, indicates a reversible SCO in the monolayers that is identical to the bulk behaviour
Source: ACS Nano
Institutions: Centre National de la Recherche Scientifique, Université de Bordeaux, Institut de Chimie de la Matière Condensée de Bordeaux, Institut Polytechnique de Bordeaux, National Interuniversity Consortium of Materials Science and Technology, University of Florence, Institut des Sciences Moléculaires, Centre de recherche Paul Pascal, Synchrotron SOLEIL, Institute for the Chemistry of OrganoMetallic Compounds
Language: English
Field: Materials Science
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W4415098089