• Reinholdt, Anders
• Mitcov, Dmitri
• Wilhelm, Fabrice
• Hassenkam, Tue
• Gelardi, Rikke Munch
• Thulstrup, Peter Waaben
• Rogalev, Andrei
• Wernsdorfer, Wolfgang
• Piligkos, Stergios
• Brechin, Euan K.
• Konstantatos, Andreas
• Pedersen, Anders H.
• Vinum, Morten Gotthold
• Sørensen, Mikkel Agerbæk
• Ceccato, Marcel

Abstract

International audience ; The synthesis and characterization of a chiral, enneanuclear Mn(III)-based, Single-Molecule Magnet, [Mn9O4(Me-sao)6(L)3(MeO)3(MeOH)3]Cl (1; Me-saoH2 = methylsalicylaldoxime, HL = lipoic acid) is reported. Compound 1 crystallizes in the orthorhombic P212121 space group and consists of a metallic skeleton describing a defect super-tetrahedron missing one vertex. The chirality of the [MnIII9] core originates from the directional bridging of the Me-sao2− ligands via the –N–O– oximate moieties, which define a clockwise (1ΔΔ) or counter-clockwise (1ΛΛ) rotation in both the upper [MnIII3] and lower [MnIII6] subunits. Structural integrity and retention of chirality upon dissolution and upon deposition on (a) gold nanoparticles, 1@AuNPs, (b) transparent Au(111) surfaces, 1ΛΛ@t-Au(111); 1ΔΔ@t-Au(111), and (c) epitaxial Au(111) on mica surfaces, 1@e-Au(111), was confirmed by CD and IR spectroscopies, mass spectrometry, TEM, XPS, XAS, and AFM. Magnetic susceptibility and magnetization measurements demonstrate the simultaneous retention of SMM behaviour and optical activity, from the solid state, via dissolution, to the surface deposited species.

Topics

• nanoparticle
• Deposition
• impedance spectroscopy
• surface
• compound
• x-ray photoelectron spectroscopy
• atomic force microscopy
• gold
• mass spectrometry
• transmission electron microscopy
• defect
• susceptibility
• magnetization
• spectrometry
• x-ray absorption spectroscopy
• space group