Atomic-scale
reproducibility and tunability endorse magnetic molecules
as candidates for spin qubits and spintronics. A major challenge is
to implant those molecular spins into circuit geometries that may
allow one, two, or a few spins to be addressed in a controlled way.
Here, the formation of mechanically bonded, magnetic porphyrin dimeric
rings around carbon nanotubes (mMINTs) is presented. The mechanical
bond places the porphyrin magnetic cores in close contact with the
carbon nanotube without disturbing their structures. A combination
of spectroscopic techniques shows that the magnetic geometry of the
dimers is preserved upon formation of the macrocycle and the mMINT.
Moreover, the metallic core selection determines the spin location
in the mMINT. The suitability of mMINTs as qubits is explored by measuring
their quantum coherence times (T
m). Formation
of the dimeric ring preserves the T
m found
in the monomer, which remains in the μs scale for mMINTs. The
carbon nanotube is used as vessel to place the molecules in complex
circuits. This strategy can be extended to other families of magnetic
molecules. The size and composition of the macrocycle can be tailored
to modulate magnetic interactions between the cores and to introduce
magnetic asymmetries (heterometallic dimers) for more complex molecule-based
qubits.
The building of van der Waals heterostructures and the decoration of 2D materials with organic molecules share a common goal: to obtain ultrathin materials with tailored properties. Performing controlled chemistry...
Mechanically interlocked derivatives of carbon nanotubes (MINTs) are interesting nanotube products since they show high stability without altering the carbon nanotube structure. So far, MINTs have been synthesized using ring‐closing metathesis, disulfide exchange reaction, H‐bonding or direct threading with macrocycles. Here, we describe the encapsulation of single‐walled carbon nanotubes within a palladium‐based metallosquare. The formation of MINTs was confirmed by a variety of techniques, including high‐resolution transmission electron microscopy. We find the making of these MINTs is remarkably sensitive to structural variations of the metallo‐assemblies. When a metallosquare with a cavity of appropriate shape and size is used, the formation of the MINT proceeds successfully by both templated clipping and direct threading. Our studies also show indications on how supramolecular coordination complexes can help expand the potential applications of MINTs.
2D materials display
exciting properties in numerous fields, but
the development of applications is hindered by the low yields, high
processing times, and impaired quality of current exfoliation methods.
In this work we have used the excellent MW absorption properties of
MoS2 to induce a fast heating that produces the near-instantaneous
evaporation of an adsorbed, low boiling point solvent. The sudden
evaporation creates an internal pressure that separates the MoS2 layers with high efficiency, and these are kept separated
by the action of the dispersion solvent. Our fast method (90 s) gives
high yields (47% at 0.2 mg/mL, 35% at 1 mg/mL) of highly exfoliated
material (90% under 4 layers), large area (up to several μm2), and excellent quality (no significant MoO3 detected).
Substitutional N-doping of single-walled carbon nanotubes is a common strategy to enhance their electrocatalytic properties in the oxygen-reduction reaction (ORR). Here, we explore the encapsulation of SWNTs within N-rich macrocycles...
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