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.