10.1021/ic5019136.s005 Xiao-Peng Zhang Xiao-Peng Zhang Victoria Y. Chang Victoria Y. Chang Jian Liu Jian Liu Xiao-Liang Yang Xiao-Liang Yang Wei Huang Wei Huang Yizhi Li Yizhi Li Cheng-Hui Li Cheng-Hui Li Gilles Muller Gilles Muller Xiao-Zeng You Xiao-Zeng You Potential Switchable Circularly Polarized Luminescence from Chiral Cyclometalated Platinum(II) Complexes American Chemical Society 2015 chiroptical properties helical chain structures Pt Potential Switchable Circularly Polarized Luminescence dichroism spectra CPL activity helical structures results novel helical structure 2015-12-17 06:46:49 Dataset https://acs.figshare.com/articles/dataset/Potential_Switchable_Circularly_Polarized_Luminescence_from_Chiral_Cyclometalated_Platinum_II_Complexes/2046684 A series of chiral cyclometalated platinum­(II) complexes, [Pt((−)-L<sub>1</sub>)­(Dmpi)]Cl ((−)-<b>1</b>), [Pt­((+)-L<sub>1</sub>)­(Dmpi)]­Cl ((+)-<b>1</b>), [Pt((−)-L<sub>2</sub>)­(Dmpi)]Cl ((−)-<b>2</b>), [Pt­((+)-L<sub>2</sub>)­(Dmpi)]Cl ((+)-<b>2</b>), [Pt<sub>3</sub>((−)-L<sub>2</sub>)<sub>2</sub>(Dmpi)<sub>4</sub>]­(ClO<sub>4</sub>)<sub>4</sub> ((−)-<b>3</b>), and [Pt<sub>3</sub>((+)-L<sub>2</sub>)<sub>2</sub>(Dmpi)<sub>4</sub>]­(ClO<sub>4</sub>)<sub>4</sub> ((+)-<b>3</b>) [(−)-L<sub>1</sub> = (−)-4,5-pinene-6′-phenyl-2,2′-bipyridine, (+)-L<sub>1</sub> = (+)-4,5-pinene-6′-phenyl-2,2′-bipyridine), (−)-L<sub>2</sub> = (−)-1,3-bis­(2-(4,5-pinene)­pyridyl)­benzene, (+)-L<sub>2</sub> = (+)-1,3-bis­(2-(4,5-pinene)­pyridyl)­benzene, Dmpi = 2,6-dimethylphenyl isocyanide], have been designed and synthesized. In aqueous solutions, (−)-<b>1</b> and (+)-<b>1</b> aggregate into one-dimensional helical chain structures through Pt···Pt, π–π, and hydrophobic–hydrophobic interactions. (−)-<b>3</b> and (+)-<b>3</b> represent a novel helical structure with Pt–Pt bonds. The formation of helical structures results in enhanced and distinct chiroptical properties as evidenced by circular dichroism spectra. Circularly polarized luminescence (CPL) was observed from the aggregates of (−)-<b>1</b> and (+)-<b>1</b> in water, as well as (−)-<b>3</b> and (+)-<b>3</b> in dichloromethane. The CPL activity can be switched reversibly (for (−)-<b>1</b> and (+)-<b>1</b>) or irreversibly (for (−)-<b>3</b> and (+)-<b>3</b>) by varying the temperature.