Autonomous artificial nanomotor powered by sunlight
Autonomous artificial nanomotor powered by sunlight
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DOI：
10.1073/pnas.0509011103
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发表时间：
2006-01-31
影响因子：
11.1
通讯作者：
Stoddart, JF
中科院分区：
文献类型：
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作者：
Balzani, V;Clemente-León, M;Stoddart, JF
光激发为轮烷环组件在哑铃形组件上相距 1.3 nm 的两个站之间的可逆穿梭运动提供动力。溶液中发生的光诱导穿梭运动基于电子和核过程的“四冲程”同步序列。在室温下，光激发获得的高能电荷转移态的失活时间约为10μs，环位移过程所需的时间约为100μs。轮烷表现为自主线性电机，运行量子效率高达约 12%。所研究的系统是人造线性纳米电机的独特示例，因为它集合了以下特征：（i）它由可见光（例如阳光）供电； (h) 它表现出自主行为，如运动蛋白； (iii) 不产生废物； (iv)其操作只能依赖于分子内过程，原则上允许在单分子水平上操作； (v)可以以1kHz的频率驱动； (vi) 在温和的环境条件下工作（即环境温度下的流体溶液）； (vii) 其在至少 10(3) 个周期内保持稳定。
Light excitation powers the reversible shuttling movement of the ring component of a rotaxane between two stations located at a 1.3-nm distance on its dumbbell-shaped component. The photoinduced shuttling movement, which occurs in solution, is based on a "four-stroke" synchronized sequence of electronic and nuclear processes. At room temperature the deactivation time of the high-energy charge-transfer state obtained by light excitation is approximate to 10 mu s, and the time period required for the ring-displacement process is on the order of 100. mu s. The rotaxane behaves as an autonomous linear motor and operates with a quantum efficiency up to approximate to 12%. The investigated system is a unique example of an artificial linear nanomotor because it gathers together the following features: (i) it is powered by visible light (e.g., sunlight); (h) it exhibits autonomous behavior, like motor proteins; (iii) it does not generate waste products; (iv) its operation can rely only on intramolecular processes, allowing in principle operation at the single-molecule level; (v) it can be driven at a frequency of 1 kHz; (vi) it works in mild environmental conditions (i.e., fluid solution at ambient temperature); and (vii) it is stable for at least 10(3) cycles.