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Photomechanical organic crystals as smart materials for advanced applications
摘要： Photomechanical molecular crystals are receiving great attention due to their efficient conversion of light into mechanical work and surpassing advantages including faster response time, higher Young’s modulus and ordered structure various measured photomechanical crystals with different motions (contraction, expansion, bending, fragmentation, hopping, curling and twisting) are springing up in the forefront of smart materials research. The photomechanical motions of these single crystals during irradiation is triggered by solid-state photochemical reactions and accompanied with phase transformation. This short review intends to summarize recent developments in the growing research on photoresponsive molecular crystals. The basic mechanisms of different kinds of photomechanical materials are described in detail, the recent advances of photomechanical crystals for promising applications as smart materials are also highlighted.
关键词： crystal engineering,photomechanical crystals,photochemistry,molecular machines,photochromism
更新于2025-09-23 15:23:52
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Visible-Light-Driven Rotation of Molecular Motors in a Dual-Function Metala??Organic Framework Enabled by Energy Transfer
摘要： The visible-light driven rotation of an overcrowded-alkene based molecular motor strut in a dual-function metal-organic framework (MOF) is reported. Two types of functional linkers, a palladium-porphyrin photosensitizer and a bispyridine derived molecular motor were used to construct the framework capable of harvesting low-energy green light to power the rotary motion. The molecular motor was introduced in the framework using the post synthetic solvent assisted linker exchange (SALE) method and the structure of the material was confirmed by powder (PXRD) and single crystal X-ray (SC-XRD) diffraction. The large decrease in the phosphorescence lifetime and intensity of the porphyrin in the MOFs upon introduction of the molecular motor pillars confirms efficient triplet-to-triplet energy transfer between the porphyrin linkers and molecular motor. Near infrared Raman spectroscopy revealed that the visible light driven rotation of the molecular motor proceeds in the solid state at rates similar to those observed in solution.
关键词： molecular motors,metal-organic frameworks,molecular machines,energy transfer
更新于2025-09-23 15:19:57