Development of precise recognition and reaction spaces based on a cage-shaped chiral supramolecular complex bearing functional groups

由化学上不等价的两种氮给电子体和双核铂(II)钳形配合物构成了具有功能化内部空间的笼形超分子络合物。在该络合物中，六个氮给电子体原子是三维排列的，因此分子尺寸合适的二元酸衍生物很好地结合在螺旋络合物中。此外，通过在配体分子中引入不对称基团构建了手性内空间，并在手性笼合物中高度选择性地识别光学活性酒石酸。单晶X射线分析和圆二色谱分析表明，手性笼络合物的螺旋度随着手性客体分子的结合而发生变化。

A cage-shaped supramolecular complex, which has a functionalyzed inner space, was constructed from disk-shaped hexa-monodentate ligands possessing chemically inequivalent two kinds of nitrogen donors and binuclear Pt(II) pincer complexes. In this complex, six nitrogen donor atoms are three-dimensionally arranged and thus dicarboxylic acid derivatives with appropriate molecular size are favorably bound in the helical complex. In addition, a chiral inner space was constructed by introducing asymmetric groups in the ligand molecules and optically active tartaric acid was highly selectively recognized in the chiral cage complex. A single crystal X-ray analysis and circular dichroism spectroscopy revealed that the helicity of the chiral cage complex changed upon binding chiral guest molecules.