synthesis of a peptide-containing lasso molecular switch by a self-entanglement strategy is described. The interlocked rotaxane molecularmachine consists of a benzometaphenylene[25]crown-8 (BMP25C8) macrocycle surrounding a molecular axle. This molecular axle contains a tripeptidic sequence and two molecularstations: a N-benzyltriazolium and a pH-sensitive aniliniumstation. The tripeptide is located between
self‐disentanglement of the molecular architecture. On another hand, it acts as a second molecularstation for the macrocycle. At acidic pH, the BMP25C8 resides around the best aniliniummolecularstation, displaying the lasso [1]rotaxane in a loosened conformation. The deprotonation of the aniliniummolecularstation triggers the shuttling of the BMP25C8 around the triazolium moiety, therefore tightening
据报道,pH敏感的两工位[1]轮烷化合物分子开关是通过非缠结的两性人分子(包括苯胺和三唑部分)的自缠结而合成的。苯胺被选作大环苯并间亚苯并[25] crown-8(BMP25C8)的最佳模板,并允许分子自缠结。通过1 H NMR光谱研究了雌雄同体分子与假[1]轮烷的平衡:在极性较小的溶剂CD 2 Cl 2中发现了最佳的自缠结条件高稀释度 然后将三唑部分苄基化以提供苄基三唑鎓部分,其随后起双重作用。一方面,它充当捕获BMP25C8的庞大门,从而避免了分子结构的任何自解缠结。另一方面,它充当了大环的第二个分子站。在酸性pH值下,BMP25C8驻留在最佳的苯胺分子站附近,以松散的构象显示套索[1]轮烷。苯胺分子站的去质子化触发了BMP25C8在三唑部分周围的穿梭,因此收紧了套索。
Bistable or Oscillating State Depending on Station and Temperature in Three-Station Glycorotaxane Molecular Machines
作者:Eric Busseron、Camille Romuald、Frédéric Coutrot
DOI:10.1002/chem.201000777
日期:2010.9.3
of two‐ and three‐station [2]rotaxane molecularmachinesbased on an anilinium, a triazolium, and a mono‐ or disubstituted pyridinium amide station is reported. In the case of the pH‐sensitive two‐stationmolecularmachines, large‐amplitude movement of the macrocycle occurred. However, the presence of an intermediate third station led, after deprotonation of the aniliniumstation, and depending on
hetero[4]rotaxane molecularmachine through a self‐sorting strategy is reported. The original tetra‐interlocked molecular architecture combines a [c2]daisy chain scaffold linked to two [2]rotaxane units. Actuation of the system through pH variation is possible thanks to the specific interactions of the dibenzo‐24‐crown‐8 (DB24C8) macrocycles for ammonium, anilinium, and triazoliummolecularstations. Selective
station that has weak affinity for the DB24C8 macrocycle and is located in the centre of the molecular axle. Two other molecularstations, arylammonium and alkylbenzylammonium moieties, sit on either side of the triazolium moiety along the molecular axle and have stronger affinities for the DB24C8 macrocycle. These two ammonium moieties are covalently linked to two different stopper groups at each extremity