2018
DOI: 10.1021/jacs.8b02349
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Abstract: Hemithioindigo-based molecular motors are powered by nondamaging visible light and provide very fast directional rotations at ambient conditions. Their ground state energy profile has been probed in detail, but the crucial excited state processes are completely unknown so far. In addition, very fast processes in the ground state are also still elusive to date and thus knowledge of the whole operational mechanism remains to a large extent in the dark. In this work we elucidate the complete lightdriven rotation … Show more

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Cited by 80 publications
(88 citation statements)
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References 60 publications
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“…Dadurch konnte eindeutig gezeigt werden, dass die ersten 180° der Rotation um die Doppelbindung von C ‐ 1 nach A ‐ 1 vollständig direktional ablaufen (mindestens 95 %, wenn angenommen wird, dass 5 % verbleibendes D ‐ 1 durch NMR‐Spektroskopie detektiert werden kann). Ähnlich zum originalen HTI‐Motor kann durch Bestrahlung von reinem A ‐ 1 auch bei −80 °C wegen des sehr schnellen thermischen Zerfalls zu C ‐ 1 kein B ‐ 1 ‐Isomer beobachtet werden ,. Unter der Annahme, dass 1.5 min Halbwertszeit noch durch NMR‐Spektroskopie detektierbar sind, kann die entsprechende Energiebarriere folglich nicht größer als 13 kcal mol −1 sein.…”
Section: Figureunclassified
“…Dadurch konnte eindeutig gezeigt werden, dass die ersten 180° der Rotation um die Doppelbindung von C ‐ 1 nach A ‐ 1 vollständig direktional ablaufen (mindestens 95 %, wenn angenommen wird, dass 5 % verbleibendes D ‐ 1 durch NMR‐Spektroskopie detektiert werden kann). Ähnlich zum originalen HTI‐Motor kann durch Bestrahlung von reinem A ‐ 1 auch bei −80 °C wegen des sehr schnellen thermischen Zerfalls zu C ‐ 1 kein B ‐ 1 ‐Isomer beobachtet werden ,. Unter der Annahme, dass 1.5 min Halbwertszeit noch durch NMR‐Spektroskopie detektierbar sind, kann die entsprechende Energiebarriere folglich nicht größer als 13 kcal mol −1 sein.…”
Section: Figureunclassified
“…From the point of view of applications, adding to these challenges is the fact that most overcrowded‐alkene motors are driven by energetic UV light, which is more damaging to the motors and their environment than visible light. Thus, a key goal in the development of light‐driven molecular motors is to make them responsive to visible light, so as to facilitate their usage in biological systems and other soft materials …”
Section: Introductionmentioning
confidence: 99%
“…[1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16] Among the various types of synthetic molecular motors available today,t hose that achieve 3608 unidirectional rotary motion through the absorption of UV or visible light are commonlyk nowna sl ight-driven rotary molecularm otors. [17][18][19][20][21][22][23][24][25] Typically, the clockwise (CW) or counterclockwise (CCW)-as determined by the molecular chirality-rotary motion results from consecutive E!Z and Z!E photoisomerizations around ac arbon-or carbon-nitrogen double bond that connects two distinct molecular halves. Furthermore, for mostm otors of this type (but not all [21] )t he reaction cycles also include slower thermalconformational relaxation steps.…”
Section: Introductionmentioning
confidence: 99%
See 1 more Smart Citation
“…[27] Although HI molecules were first synthesized over a century ago [24] and their basic photoswitching characteristics have been known for at least two decades, [25] interest has recently grown due to the development of new derivatives that respond to red light, have high thermal stability of their switching states, are simple to synthesize and function-alize, and exhibit high photostability. [17] Recent contributions have reported asymmetric HI systems that exhibit photoswitching of chiroptical properties, [26] and HTI chromophores that can be deployed as controllable molecular motors, [23,[28][29][30][31][32] receptors [33][34] or tweezers. [19,35] Other applications include light controlled peptide structure [36][37][38] and supramolecular chemistry.…”
mentioning
confidence: 99%