A dithienylethene molecule involving carborane clusters shows remarkable fatigue resistance and high contrast visual colour changes when irradiated with alternating ultraviolet and visible light. The fluorescence of this assembly can be switched on and off when irradiated in the solid state but not in the solution state.
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Carborane photochromism: a fatigue resistant carborane switch.
Chem Commun (Camb)
September 2021
Department of Chemistry, Durham University, Lower Mountjoy, Stockton Road, Durham, DH1 3LE, UK.
A dithienylethene molecule involving carborane clusters shows remarkable fatigue resistance and high contrast visual colour changes when irradiated with alternating ultraviolet and visible light. The fluorescence of this assembly can be switched on and off when irradiated in the solid state but not in the solution state.
View Article and Find Full Text PDFSolid-State Photochromism by Molecular Assembly of Bis-o-carboranyl Siloles.
Chemistry
June 2019
Department of Advanced Materials Chemistry, Korea University, Sejong, 30019, South Korea.
A new type of solid-state photochromism was observed in an AB -type molecular assembly comprising a central silole and two peripheral o-carborane units, and in this assembly, depending on the assembling positions of those units at the adjoining benzene ring, two different regioisomers were formed: Si-m-Cb and Si-p-Cb. Each isomer showed different solid-state photochromism depending on its solid-state molecular conformation and was either in the crystalline or amorphous state. The crystals of each meta- or para-isomer, C or C , showed yellow or blue emission, and mechanically grinding those crystals into amorphous powders of A and A , switched their emissions to blue and yellow, respectively.
View Article and Find Full Text PDFReversible Photothermal Isomerization of Carborane-Fused Azaborole to Borirane: Synthesis and Reactivity of Carbene-Stabilized Carborane-Fused Borirane.
Angew Chem Int Ed Engl
July 2017
Department of Chemistry and State Key Laboratory of Synthetic Chemistry, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong, China.
A fully reversible photothermal isomerization between carborane-fused trigonal-planar azaborole (dark-purple) and tetrahedral borirane (pale-yellow) has been observed, leading to the isolation and structural characterization of the first example of carborane-fused borirane. DFT calculations indicate that the azaborole is thermodynamically more stable than the borirane by 11.2 kcal mol , and the energy barrier for the thermal conversion from azaborole to borirane is 35.
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