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• W2334605619 endingPage "1619" @default.
• W2334605619 startingPage "1611" @default.
• W2334605619 abstract "We describe the synthesis, characterization, photochemical isomerization, and rotational dynamics of a crystalline molecular gyroscope containing an azobenzene bridge (trans-2) that spans from one end of the stator to other, with the intention of exploring its function as a molecular brake. While single crystal X-ray diffraction analysis of a photochemically inactive dichloromethane solvate was used to confirm the molecular and packing structures of trans-2, a nanocrystalline pseudopolymorph was shown to be photoactive, and it was analyzed by powder X-ray diffraction (PXRD), scanning electron microscopy, and variable temperature solid state 2H NMR before and after photoisomerization. It was shown that the nanocrystalline suspension irradiated with λ = 340 nm reaches a photostationary state with 34% of cis-isomer, as compared to that observed in solution where the corresponding value is 74%. Line shape analysis of solid state 2H NMR spectra of a phenylene-d4 isotopologue, obtained as a function of temperature, indicated that rotation in crystals of the trans-2 isomer, with a mean activation energy of 4.6 ± 0.6 kcal/mol and a pre-exponential factor exp(29.4 ± 1.7), is ten times faster than that of samples containing the cis-2 isomer, which has a higher mean activation energy of 5.1 ± 0.6 kcal/mol and a lower pre-exponential factor of exp(27.9 ± 1.3)." @default.
• W2334605619 created "2016-06-24" @default.
• W2334605619 creator A5037851737 @default.
• W2334605619 creator A5070479287 @default.
• W2334605619 date "2014-02-03" @default.
• W2334605619 modified "2023-09-26" @default.
• W2334605619 title "Photochromic Molecular Gyroscope with Solid State Rotational States Determined by an Azobenzene Bridge" @default.
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• W2334605619 doi "https://doi.org/10.1021/jo402516n" @default.
• W2334605619 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/24428572" @default.
• W2334605619 hasPublicationYear "2014" @default.
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