Abstract
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 accompanied by red shift of wavelength were observed.
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