Ultrafast nonadiabatic photoisomerization dynamics study of molecular motor based on the synthetic indanylidene-ppyrrolinium frameworks

Control of the relative unidirectional of motion is an essential feature for improve the operational efficiency of light-driven molecular motor. Here we present an improved electric neutrality motor featuring a significant unidirectionality rotary motion approximately reached to 78.8%. Most importantly, we found that a very small pretwist (ca.0.9 degree) of the reactive C = C bond is sufficient to lead such high probability of unidirectional rotational motion. Furthermore, the quantitative investigation of excited state light-driven nonadiabatic dynamics of the synthetic molecular motors are performed. The fluorescence emission quenching accom-panied by red shift of wavelength were observed.

Automated summary

In this study, an improved electric neutrality motor with a significant unidirectional rotary motion of approximately 78.8% was introduced. It was found that a very small pretwist of the reactive C=C bond (around 0.9 degrees) is sufficient to achieve such high probability of unidirectional rotation. Additionally, quantitative investigation of the excited state light-driven nonadiabatic dynamics of synthetic molecular motors was performed, revealing fluorescence emission quenching and a red shift of wavelength.