Dynamic Chemical Devices: Modulation of Photophysical Properties by Reversible, Ion-Triggered, and Proton-Fuelled Nanomechanical Shape-Flipping Molecular Motions
作者:Mihail Barboiu、Luca Prodi、Marco Montalti、Nelsi Zaccheroni、Nathalie Kyritsakas、Jean-Marie Lehn
DOI:10.1002/chem.200306045
日期:2004.6.21
change in photophysical properties: from a highly fluorescent free ligand to a very weakly emitting complex. The W/U structural switching can be reversibly induced by the addition of a competitive tren ligand, which binds and releases a zinc(II) ion under protonation/deprotonation cycles, thus leading to oscillations in light emission. Therefore, the present system performs periodic modulation of optical
源自萜的(叔吡啶=叔吡啶)配体1具有延伸的W形,其中两个附加的光敏pyr基保持分开。锌(II)离子与叔丁基结合后,配体1转变为络合物2,从而呈U形,从而堆叠了芳族单元。这种结构修饰导致光物理性质发生非常显着的变化:从高度无荧光的配体到发射极弱的复合物。W / U结构转换可以通过添加竞争性tren配体来可逆地诱导,该竞争性tren配体在质子化/去质子化循环下结合并释放锌(II)离子,从而导致发光振荡。因此,本系统通过纳米机械形状翻转运动对光输出进行周期性调制,由金属离子结合触发,并由酸碱中和能量推动。总体而言,它代表离子触发的光机械超分子设备。