Introduction of Clutch Function into a Molecular Gear System by Silane−Silicate Interconversion
作者:Wataru Setaka、Takayoshi Nirengi、Chizuko Kabuto、Mitsuo Kira
DOI:10.1021/ja805777p
日期:2008.11.26
molecular gears in solution at room temperature. On the other hand, silicate 2 in the solid state has quite an unusual TBP structure having two organic triptycyl groups at the apical positions and three electronegative fluorine atoms at the equatorial positions against the Muetterties rule. Rotation of the two triptycyl groups around Si-C bonds in 2 is facile and independent to each other in solution. Silicate
将离合器分离机构引入新的齿轮系统双(4-甲基-9-三环基)二氟硅烷 1 是通过氟离子的可逆连接得到相应的氟硅酸盐 2 来实现的。 尽管 1 (1( dl) 和 1(meso)) 无法分离,因为通过缓慢的齿轮滑动过程达到平衡(DeltaH(双匕首)= 17.2 +/- 0.2 kcal x mol(-1)和 DeltaS(双匕首)= 0.9 +/ - 0.9 cal x mol(-1) x K(-1)), 1 在室温下在溶液中用作啮合分子齿轮。另一方面,固态的硅酸盐 2 具有非常不寻常的 TBP 结构,在顶端位置有两个有机三苯乙烯基团,在赤道位置有三个电负性氟原子,违反了 Muetterties 规则。在 2 中围绕 Si-C 键的两个三苯乙烯基团的旋转在溶液中很容易且彼此独立。通过用过量的水处理,硅酸盐2变回相应的硅烷混合物。