| 1. |
- Beeren, Sophie R., et al.
(författare)
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The mechanical bond in biological systems
- 2023
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Ingår i: Chem. - : Elsevier BV. - 2451-9308 .- 2451-9294. ; 9:6, s. 1378-1412
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Forskningsöversikt (refereegranskat)abstract
- The field of mechanically interlocked molecules (MIMs) has advanced rapidly in recent years, with much work focused on their use in materials, sensing, and catalysis. However, the use of MIMs in biology and biomedicine has been limited, despite the identifica-tion of naturally occurring MIMs in DNA and proteins and the poten-tial advantages of the mechanical bond in fields such as nanomedi-cine and tissue engineering. Difficulties in the synthesis of MIMs, along with their limited solubility and stability in biological media, have until recently impeded their wider application in biology. Contemporary advances have, however, enabled a broader integra-tion of the mechanical bond in biology; the mechanical interlocking endows these systems with unique functional advantages. Herein, we summarize recent advances in the application of small-molecule, biologically derived, and polymeric MIMs in biology, highlighting synergies ripe for future exploration.
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| 2. |
- Chen, Xuehan, et al.
(författare)
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Perspective Phosphine oxide additives for perovskite diodes and solar cells
- 2023
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Ingår i: Chem. - : CELL PRESS. - 2451-9308 .- 2451-9294. ; 9:3, s. 562-575
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Forskningsöversikt (refereegranskat)abstract
- Lead halide perovskites have been considered promising semicon-ducting materials for next-generation optoelectronic devices due to their solution processability and excellent optoelectronic proper-ties. Device performance of perovskite light-emitting diodes (PeLEDs) and perovskite solar cells (PSCs) has been rapidly devel-oped during the past decade. Very recently, organic molecules containing phosphine oxide groups have emerged as promising ad-ditives and passivators to improve the device performance and sta-bility of both PeLEDs and PSCs. In this perspective, we summarize recent progress in the development of new phosphine-oxide-based additives for PeLEDs and PSCs. The passivation mechanism, molecule design principle, and structure-property relationship of phosphine oxide molecules for PeLEDs and PSCs are systematically discussed and analyzed. Finally, we provide an outlook on the mo-lecular design of novel phosphine oxide compounds for efficient and stable PeLEDs and PSCs in the future.
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| 3. |
- Davison, Nathan, et al.
(författare)
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A room-temperature-stable electride and its reactivity : Reductive benzene/pyridine couplings and solvent-free Birch reductions
- 2023
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Ingår i: Chem. - : Elsevier. - 2451-9308 .- 2451-9294. ; 9:3, s. 576-591
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Tidskriftsartikel (refereegranskat)abstract
- In this work, we report the synthesis of a room-temperature-stable electride (RoSE) reagent, namely K+(LiHMDS)e− (1) (HMDS: 1,1,1,3,3,3-hexamethyldisilazide), from accessible starting materials (potassium metal and LiHMDS) via mechanochemical ball milling at 20 mmol scale. Despite its amorphous nature, the presence of anionic electrons in 1, key diagnostic criteria for an electride, was confirmed by both experimental and computational studies. Therefore, by definition, 1 is an electride. Utilizing its anionic electrons, electride reagent 1 exhibited a versatile reactivity profile that includes (1) mediation of C–H activation and C–C coupling of benzene and pyridine and (2) mediation of solvent-free Birch reduction. This work proves the concept of facile mechanochemical synthesis of a room-temperature-stable electride, and it introduces electride 1 to the synthetic chemistry community as a versatile reagent.
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| 4. |
- Liu, Tianjun, et al.
(författare)
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Molecule additive design for perovskite light-emitting diodes operated at high current densities
- 2023
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Ingår i: Chem. - : CELL PRESS. - 2451-9308 .- 2451-9294. ; 9:8, s. 2058-2059
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Forskningsöversikt (refereegranskat)abstract
- Halide perovskite light emitting diodes (PeLEDs) are enticing candi-dates for displays and lighting. However, most reported PeLEDs are limited for practical applications at high current densities due to decreased efficiency and rapid degradation. Recently, in Nature, Greenham and co-workers developed PeLEDs with exceptional per-formance at a high current density above 1000 mA cm -2, achieved by the introduction of a multifunctional molecule that simulta-neously minimizes non-radiative distributions in emitter layers and suppresses luminescence quenching at the interface between perovskite and charge-transport layers.
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| 5. |
- Schaufelberger, Fredrik
(författare)
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Vintage ligand powers switchable molecular motors
- 2023
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Ingår i: Chem. - : Elsevier BV. - 2451-9308 .- 2451-9294. ; 9:8, s. 2053-2055
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Tidskriftsartikel (refereegranskat)abstract
- Creating artificial molecular machines that perform well-defined unidirectional movement in response to stimuli is a challenging task. In this issue of Chem, Crespi, Feringa, and co-workers report a new bis(benzoxazole) ligand-based molecular motor that enables a high degree of external control over motor function through complexation with metal ions.
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| 6. |
- Stindt, Charlotte N., et al.
(författare)
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Activating a light-driven molecular motor by metal complexation
- 2023
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Ingår i: Chem. - : CELL PRESS. - 2451-9308 .- 2451-9294. ; 9:8
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Tidskriftsartikel (refereegranskat)abstract
- Designing increasingly complex, responsive, and dynamic molecular systems, whose actions can be controlled by a combination of cooperative stimuli, is a key challenge toward the development of more advanced functional molecular machines. Herein, we report new photochemically driven molecular motors based on a bis(benzoxazole) ligand. Coordination of the ligand to a metal salt leads to the selective in situ activation of a well-defined motor function, which can be deactivated in the presence of a competing ligand. The rotation speed and absorption wavelength are tuned by the choice of metal, allowing unprecedented control of the molecular system. DFT calculations show that the geometry of the metal center influences the rotational barriers and the possibility to couple the rotary motion with the wagging movement at the metal center. The approach presented here will open new avenues toward more complex, dynamic, and coupled systems.
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