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| Open AccessBistability between π-diradical open-shell and closed-shell states in indeno[1,2-a]fluorene
Switching the magnetic state of a polycyclic conjugated hydrocarbon in a reversible and controlled manner is challenging. Now, by means of single-molecule scanning probe microscopy, an indenofluorene isomer on ultrathin NaCl films has been shown to adopt both open- and closed-shell states. Furthermore, bidirectional switching between the two states is achieved by changing the adsorption site of the molecule.
- Shantanu Mishra
- , Manuel Vilas-Varela
- & Leo Gross
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Article
| Open AccessCircumventing the stability problems of graphene nanoribbon zigzag edges
On-surface synthesis enables highly reactive structures to be produced under vacuum, but they need to be passivated to be incorporated into practical devices. Here, the facile protection of air-sensitive chiral graphene nanoribbons has been shown, by either hydrogenation or synthesis of an oxidized form. The chemically stable forms can subsequently be deprotected.
- James Lawrence
- , Alejandro Berdonces-Layunta
- & Dimas G. de Oteyza
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σ–σ Stacked supramolecular junctions
Supramolecular interactions play an essential role in organic electronic materials and biological systems. Now, it has been demonstrated that the σ–σ stacking interactions between neighbouring non-conjugated molecules can offer an efficient pathway for charge transport through supramolecular junctions, which provides a new guideline for the design and fabrication of organic materials and devices.
- Anni Feng
- , Yu Zhou
- & Wenjing Hong
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Stoichiometric two-dimensional non-van der Waals AgCrS2 with superionic behaviour at room temperature
Layered materials held together by weak interactions can be exfoliated into monolayers that retain the structure and composition of their bulk counterpart, but this has remained challenging to achieve for non-van der Waals materials. Now, AgCrS2 has been exfoliated into such [CrS2]Ag[CrS2] nanosheets through intercalation with tetraalkylammonium cations chosen for their suitable redox potential. The nanosheets show superionic behaviour at room temperature.
- Jing Peng
- , Yuhua Liu
- & Yi Xie
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Spin-crossover nanoparticles anchored on MoS2 layers for heterostructures with tunable strain driven by thermal or light-induced spin switching
Spin-crossover nanoparticles have been covalently grafted onto a semiconducting MoS2 layer to form a self-strainable heterostructure. Under light or thermal stimulus, the nanoparticles switch between their high- and low-spin states, in which they have different volumes. This generates a reversible strain over the MoS2 layer and, in turn, alters the electrical and optical properties of the heterostructure.
- Ramón Torres-Cavanillas
- , Marc Morant-Giner
- & Eugenio Coronado
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Large magnetic exchange coupling in rhombus-shaped nanographenes with zigzag periphery
Open-shell nanographenes are promising for quantum technologies, but their magnetic stability has remained limited by weak exchange coupling. Now, two large rhombus-shaped nanographenes with zigzag peripheries, one with 48 carbon atoms and the other with 70, have been synthesized on gold and copper surfaces. The 70-carbon compound exhibits a large magnetic exchange coupling exceeding 100 meV.
- Shantanu Mishra
- , Xuelin Yao
- & Roman Fasel
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On-surface synthesis and characterization of individual polyacetylene chains
Polyacetylene is an ideal system to probe to gain a better understanding of the nature of charge transport in conducting polymers. Now, individual atomically precise polyacetylene chains have been synthesized on a copper surface and characterized using a range of techniques, revealing a doping-induced semiconductor-to-metal transition.
- Shiyong Wang
- , Qiang Sun
- & Wei Xu
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Real-time observation of multiexcitonic states in ultrafast singlet fission using coherent 2D electronic spectroscopy
Singlet fission, a spin-allowed conversion of a spin-singlet state into a pair of spin-triplet excitons, may be useful for the development of next-generation photovoltaics. Ultrafast coherence measurements now show that vibrational motions play a critical role in fission as they facilitate the mixing of triplet-pair states with singlet excitons.
- Artem A. Bakulin
- , Sarah E. Morgan
- & Akshay Rao
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Editorial |
Molecular electronics under the microscope
The field of molecular electronics has developed significantly as experimental techniques to study charge transport through single molecules have become more reliable. Three Articles in this issue highlight how chemists can now better understand and control electronic properties at the molecular level.
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Review Article |
Porphyrins at interfaces
Bringing porphyrins in contact with well-defined interfaces generates a rich playground of chemical behaviour and properties for exploration and exploitation. This Review examines our current understanding of surface-confined tetrapyrroles and their embedding in nanoarchitectures - discussing both the structural and functional attributes, and methods by which to manipulate their intramolecular and organizational features.
- Willi Auwärter
- , David Écija
- & Johannes V. Barth
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News & Views |
Phases full of fullerenes
Self-assembled amphiphiles are more common in the realm of aqueous systems than in organic solvents. Their scope has now been expanded with the advent of 'hydrophobic amphiphiles' of π-conjugated–alkyl systems, which show various self-assembled phases similar to classical amphiphiles.
- Albert P. H. J. Schenning
- & Subi J. George
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News & Views |
Excitations get random
The fate of newly created excited states in conjugated materials is not fully understood, with unanswered questions regarding where exactly excitons form and their subsequent behaviour. Now, single-molecule spectroscopy studies of large conjugated molecular wheels reveal that excitons localize at random positions around the wheel rims.
- Ivan G. Scheblykin
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Fluctuating exciton localization in giant π-conjugated spoked-wheel macrocycles
A deficiency in our molecular-level understanding of the electronic structure of conjugated polymers hinders their potential use in electronic applications. Shape-persistent highly ordered ring structures have been used to mimic conjugated polymers and have now been studied using single-molecule spectroscopy. The fundamentally non-deterministic nature of excitation energy localisation in π-conjugated macromolecules has been demonstrated.
- A. Vikas Aggarwal
- , Alexander Thiessen
- & John M. Lupton
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Coexistence of superconductivity and magnetism by chemical design
The co-existence of superconductivity and magnetism in single compounds is rare, and heterostructures containing both properties have only been made with complex techniques. Now, a molecular-building-block approach has been applied to match organic and inorganic layers to produce multifunctional materials.
- Eugenio Coronado
- , Carlos Martí-Gastaldo
- & Peter J. Baker
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News & Views |
An electric effect
Electrically tunable materials are used to construct switches and memory devices. Applying an electric field within a specific temperature range to cyanometallate complexes triggers their charge-transfer phase transition, altering their optical and magnetic properties.
- Osamu Sato