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Article
Potential Switchable Circularly Polarized Luminescence from Chiral Cyclometalated Platinum(II) Complexes
Inorganic Chemistry (2015)
  • Xiao-Peng Zhang Zhang, Nanjing University
  • Victoria Y. Chang, San Jose State University
  • Jian Liu, Nanjing University
  • Xiao-Liang Yang, Nanjing University
  • Wei Huan, Nanjing University
  • Yizhi Li, Nanjing University
  • Cheng-Hui Li, Nanjing University
  • Gilles Muller, San Jose State University
  • Xiao-Zeng You, Nanjing University
Abstract
A series of chiral cyclometalated platinum(II) complexes, [Pt((−)-L1)(Dmpi)]Cl ((−)-1), [Pt((+)-L1)(Dmpi)]Cl ((+)-1), [Pt((−)-L2)(Dmpi)]Cl ((−)-2), [Pt((+)-L2)(Dmpi)]Cl ((+)-2), [Pt3((−)-L2)2(Dmpi)4](ClO4)4 ((−)-3), and [Pt3((+)-L2)2(Dmpi)4](ClO4)4 ((+)-3) [(−)-L1 = (−)-4,5-pinene-6′-phenyl-2,2′-bipyridine, (+)-L1 = (+)-4,5-pinene-6′-phenyl-2,2′-bipyridine), (−)-L2 = (−)-1,3-bis(2-(4,5-pinene)pyridyl)benzene, (+)-L2 = (+)-1,3-bis(2-(4,5-pinene)pyridyl)benzene, Dmpi = 2,6-dimethylphenyl isocyanide], have been designed and synthesized. In aqueous solutions, (−)-1 and (+)-1 aggregate into one-dimensional helical chain structures through Pt···Pt, π–π, and hydrophobic–hydrophobic interactions. (−)-3 and (+)-3 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 (−)-1 and (+)-1 in water, as well as (−)-3 and (+)-3 in dichloromethane. The CPL activity can be switched reversibly (for (−)-1 and (+)-1) or irreversibly (for (−)-3 and (+)-3) by varying the temperature.
Disciplines
Publication Date
2015
DOI
10.1021/ic5019136
Publisher Statement
This article was originally published in Inorganic Chemistry, volume 54, issue 1, 2015. It can also be found online at this link.

ACS AuthorChoice - This is an open access article published under an ACS AuthorChoice License, which permits copying and redistribution of the article or any adaptations for non-commercial purposes.
Citation Information
Xiao-Peng Zhang Zhang, Victoria Y. Chang, Jian Liu, Xiao-Liang Yang, et al.. "Potential Switchable Circularly Polarized Luminescence from Chiral Cyclometalated Platinum(II) Complexes" Inorganic Chemistry Vol. 54 Iss. 1 (2015) p. 143 - 152 ISSN: 0020-1669
Available at: http://works.bepress.com/gilles_muller/63/