Point-Line-Plane-Helix Binuclear Platinum(II) Complexes: Metal-Induced Chirality, Chirality Self-Sorting, and Chiroptical Properties

Chirality is a fundamental property of nature, and thus,buildingnovel chiral molecules plays a crucial role in multidisciplinary fields.Herein, we have developed a straightforward approach to effectivelyincorporate all four types of point, axial, planar, and helical chiralitiesinto a single molecule for the first time. The resultant point-line-plane-helixbinuclear Pt(II) complexes exhibit multiple chiralities, includingnot only point and axial chiralities from the bridging ligands butalso planar and helical chiralities from metal coordination. The intramolecular & pi;-& pi; and Pt-Pt interactions will restrictintramolecular rotations, thereby stabilizing the metal-induced planarand helical chiralities. Furthermore, enantiopure (R,R,R,R ( p ) ,M) or (S,S,S,S ( p ) ,P) moleculescould be obtained by chirality self-sorting without the use of chiralhigh-performance liquid chromatography. Their single-crystal, circulardichroism, and circularly polarized luminescence properties are comprehensivelyinvestigated, providing unequivocal insights into the design of multiple-chiralitymaterials for related applications. Enantiopurepoint-line-plane-helix (R,R,R,R ( p ) ,M) or (S,S,S,S ( p ) ,P) binuclearPt(II) complexes bearing multiple chiralitiesincluding not only point and axial chirality from the bridging ligandsbut also planar and helical chirality from metal coordination weredesigned and prepared for chiroptical and CPL applications.

Automated summary

Building novel chiral molecules is crucial in multidisciplinary fields. This study developed a straightforward approach to incorporate all four types of chiralities into a single molecule, resulting in Pt(II) complexes with multiple chiralities.