Circular Dichroism Spectroscopy Study of Crystalline‐to‐Amorphous Transformation in Chiral Platinum(II) Complexes

Zhang, Xiao-Peng; Wu, Tao; Liu, Jian; Zhao, Jincheng; Li, Chenghui; You, Xiao‐Zeng

doi:10.1002/chir.22149

Cited by 8 publications

(2 citation statements)

References 46 publications

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“…Cyclometalated platinum(II) complexes have long been the subject of intense investigation as luminescent materials due to their intriguing stimulus-responsive structural and spectroscopic properties. − Moreover, cyclometalated platinum(II) complexes have been proven to be biologically active as antitumor agents and DNA intercalators . Therefore, cyclometalated platinum(II) complexes with CPL emission would be very useful in organic light-emitting diodes (OLEDs) and chiral probes in biological systems.…”

Section: Introductionmentioning

confidence: 99%

Potential Switchable Circularly Polarized Luminescence from Chiral Cyclometalated Platinum(II) Complexes

et al. 2014

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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.

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Section: Introductionmentioning

confidence: 99%

Potential Switchable Circularly Polarized Luminescence from Chiral Cyclometalated Platinum(II) Complexes

et al. 2014

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“…vapor, mechanical force) of a series of chiral cyclometalated platinum(II) complexes both in solution and in solid state by electronic circular dichroism (ECD), vibrational circular dichroism (VCD), and circular polarized luminescence (CPL). [32][33][34] Of particular interest is the chiral platinum(II) complexes with pinene functionalized C^N^N ligands, showing interesting vapor-induced chiroptical switching properties. 35 According to previous studies, when pinene groups are introduced, the steric hindrance is increased and molecules become more rigid.…”

Section: Introductionmentioning

confidence: 99%

Novel redox responsive chiral cyclometalated platinum(ii) complexes with pinene functionalized C^N^N ligands

et al. 2016

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Luminescence Color Tuning of Pt^II Complexes and a Kinetic Study of Trimer Formation in the Photoexcited State

Kayano

Takayasu

Sato

et al. 2014

Chemistry A European J

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We investigated the luminescence properties and color tuning of [Pt(dpb)Cl] (dpbH=1,3-di(2-pyridyl)benzene) and its analogues. An almost blue emission was obtained for the complex [Pt(Fmdpb)CN] (FmdpbH=4-fluoro-1,3-di(4-methyl-2-pyridyl)benzene), modified by the introduction of F and CH3 groups to the dpb ligand and the substitution of Cl by CN. As the concentration of the solution was increased, the color of the emission varied from blue to white to orange. The color change resulted from a monomer-excimer equilibrium in the excited state. A broad emission spectrum around 620 nm was clearly detected along with a structured monomer emission around 500 nm. Upon further increases in concentration, another broad peak appeared in the longer wavelength region of the spectrum. We assigned the near-infrared band to the emission from an excited trimer generated by the reaction of the excimer with the ground-state monomer. The emission lifetimes of the monomer, dimer, and trimer were evaluated as τM =12.8 μs, τD =2.13 μs, and τT =0.68 μs, respectively, which were sufficiently long to allow association with another Pt(II) complex and dissociation into a lower order aggregate. Based on equilibrium constants determined from a kinetic study, the formation of the excimer and the excited trimer were concluded to be exothermic processes, with ΔG*D =-24.5 kJ mol(-1) and ΔG*T =-20.4 kJ mol(-1) respectively, at 300 K.

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Circular Dichroism Spectroscopy Study of Crystalline‐to‐Amorphous Transformation in Chiral Platinum(II) Complexes

Cited by 8 publications

References 46 publications

Potential Switchable Circularly Polarized Luminescence from Chiral Cyclometalated Platinum(II) Complexes

Potential Switchable Circularly Polarized Luminescence from Chiral Cyclometalated Platinum(II) Complexes

Novel redox responsive chiral cyclometalated platinum(ii) complexes with pinene functionalized C^N^N ligands

Luminescence Color Tuning of Pt^II Complexes and a Kinetic Study of Trimer Formation in the Photoexcited State

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Circular Dichroism Spectroscopy Study of Crystalline‐to‐Amorphous Transformation in Chiral Platinum(II) Complexes

Cited by 8 publications

References 46 publications

Potential Switchable Circularly Polarized Luminescence from Chiral Cyclometalated Platinum(II) Complexes

Potential Switchable Circularly Polarized Luminescence from Chiral Cyclometalated Platinum(II) Complexes

Novel redox responsive chiral cyclometalated platinum(ii) complexes with pinene functionalized C^N^N ligands

Luminescence Color Tuning of PtII Complexes and a Kinetic Study of Trimer Formation in the Photoexcited State

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Luminescence Color Tuning of Pt^II Complexes and a Kinetic Study of Trimer Formation in the Photoexcited State