实施经典煤焦油染料家族四位成员的策略,Michler\'s酮,亚甲蓝,罗丹明B,还有结晶紫,引入[Pd2L4]自组装。使用哌嗪连接剂将发色团掺入双单齿配体中,该哌嗪连接剂允许保留可见光谱中深红色所需的生长素铬二烷基胺官能团。在钯配位时,配体与吡啶供体形成灯笼形双核笼,而喹啉供体在溶液中导致强烈扭曲的[Pd2L4]螺旋。在一个案例中,单晶X射线衍射显示在固态下重排为[Pd3L6]环结构。对于九种检查过的衍生物,显示从黄色到深紫色的颜色,CD光谱学公开了由对映体纯的客体引起的不同程度的手性诱导。离子迁移质谱允许区分两种结合模式。基于这种新的配体类的自组装有望在手性识别中的应用,光-氧化还原催化和光学材料。
A strategy to implement four members of the classic coal-tar dye family, Michler\'s ketone, methylene blue, rhodamine B, and crystal violet, into [Pd2 L4 ] self-assemblies is introduced. Chromophores were incorporated into bis-monodentate ligands using piperazine linkers that allow to retain the auxochromic dialkyl amine functionalities required for intense colors deep in the visible spectrum. Upon palladium coordination, ligands with pyridine donors form lantern-shaped dinuclear cages while quinoline donors lead to strongly twisted [Pd2 L4 ] helicates in solution. In one case, single crystal X-ray diffraction revealed rearrangement to a [Pd3 L6 ] ring structure in the solid state. For nine examined derivatives, showing colors from yellow to deep violet, CD spectroscopy discloses different degrees of chiral induction by an enantiomerically pure guest. Ion mobility mass spectrometry allows to distinguish two binding modes. Self-assemblies based on this new ligand class promise application in chiroptical recognition, photo-redox catalysis and optical materials.