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| Azevedo, Nuno Monteiro |
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Thulstrup, Peter Waaben
University of Copenhagen
in Cooperation with on an Cooperation-Score of 37%
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Publications (5/5 displayed)
- 2022Silver Nanoclusters Serve as Fluorescent Rivets Linking Hoogsteen Triplex DNA and Hairpin-Loop DNA Structurescitations
- 2019Molecular multifunctionality preservation upon surface deposition for a chiral single-molecule magnetcitations
- 2016Construction of insulin 18-mer nanoassemblies driven by coordination to Iron(II) and Zinc(II) ions at distinct sitescitations
- 2013Self-assembly of designed coiled coil peptides studied by small-angle X-ray scattering and analytical ultracentrifugationcitations
- 2011Metal Ion Controlled Polymorphism of a Peptide
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article
Molecular multifunctionality preservation upon surface deposition for a chiral single-molecule magnet
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.