2020
DOI: 10.1002/chem.202003096
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Abstract: Efficiency and performance of light triggered molecular motors are crucial features that need to be mechanistically understood to improve the performance and enable conscious property tailoringf or specific applications. In this work, three differenth emithioindigo-based molecular motors are investigated and all four steps in their complete unidirectionalr otation are unraveled fully quantitatively. Transient absorption spectroscopy across twelveo rders of magnitude in time is used to probe the fs nuclear moti… Show more

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Cited by 15 publications
(20 citation statements)
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“…Due to very fast thermal relaxation the corresponding ΔG � B-C values for thermal B-1 to C-1 and B-2 to C-2 conversions were obtained by time resolved absorption spectroscopy at 22°C in CH 2 Cl 2 solution using a multiscale broadband setup covering 12 orders of magnitude in time, as previously reported. [12] The experimental data obtained for derivatives 3 and 4 evidence unidirectional motor behavior analogous to the previously studied HTI motor derivatives 1, 2, and 5. The photoreactions of pure isomers C-3 and C-4 at À 80°C were followed by recording a series of 1 H NMR spectra during 470 nm illumination.…”
Section: Kinetic Measurements and Light Powered Unidirectional Rotations Of 3 Andsupporting
confidence: 60%
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“…Due to very fast thermal relaxation the corresponding ΔG � B-C values for thermal B-1 to C-1 and B-2 to C-2 conversions were obtained by time resolved absorption spectroscopy at 22°C in CH 2 Cl 2 solution using a multiscale broadband setup covering 12 orders of magnitude in time, as previously reported. [12] The experimental data obtained for derivatives 3 and 4 evidence unidirectional motor behavior analogous to the previously studied HTI motor derivatives 1, 2, and 5. The photoreactions of pure isomers C-3 and C-4 at À 80°C were followed by recording a series of 1 H NMR spectra during 470 nm illumination.…”
Section: Kinetic Measurements and Light Powered Unidirectional Rotations Of 3 Andsupporting
confidence: 60%
“…Kinetic analysis confirmed the helix inversions as first order reactions allowing to determine the Δ G ǂ values for these processes. Due to very fast thermal relaxation the corresponding Δ G ǂ B ‐ C values for thermal B ‐ 1 to C ‐ 1 and B ‐ 2 to C ‐ 2 conversions were obtained by time resolved absorption spectroscopy at 22 °C in CH 2 Cl 2 solution using a multiscale broadband setup covering 12 orders of magnitude in time, as previously reported [12] …”
Section: Resultsmentioning
confidence: 99%
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“…10%) when the methoxy groups on the upper half were exchanged for methyl or iso-propyl groups, however only small differences in the QYs for the E / Z and triplet state pathways were observed. 126 Extensive computational research into the quantum chemical processes of light-driven rotary molecular motors in recent years has proven to be a powerful tool in studying the elusive photoisomerisation step. 49,65,66,69,124 These calculations have led to the development of several theoretical motor scaffolds (Fig.…”
Section: Quantum Efficiencymentioning
confidence: 99%