1D-helical platinum(ii) complexes bearing metal-induced chirality, aggregation-induced red phosphorescence, and circularly polarized luminescence

Abstract

Binaphthyls-linked Pt(ii) complexes with metal-induced chirality self-assemble to build 1D M or P helices and show aggregation/racemization-induced and circularly polarized luminescence.

Enhanced Circularly Polarized Luminescence Activity in Chiral Platinum(II) Complexes With Bis- or Triphenylphosphine Ligands

“…The g lum values around the maximum emission wavelength are −1.5 × 10 −3 /+1.2 × 10 −3 for (-)-3/(+)-3 ( Figure 2), −1.2 × 10 −3 /+1.6 × 10 −3 for (-)-4/(+)-4, −1.4 × 10 −3 /+1.0 × 10 −3 for (-)-5/(+)-5, and −1.3 × 10 −3 /+1.0 × 10 −3 for (-)-6/(+)-6 ( Figures S2-S4). These are comparable to the values reported for helicene-and binaphthyl-derived Pt(II) complexes or helical assemblies of square-planar Pt(II) complexes, with CPL values from 10 −3 to 10 −2 order (Shen et al, 2014;Schulte et al, 2017;Ikeda et al, 2018;Song et al, 2019). Similarly, CPL signals can be unambiguously detected for mononuclear complexes (-)-7 and (+)-7 with opposite g lum values [(-)-7: −1.0 × 10 −3 ; (+)-7: +1.0 × 10 −3 at 546 nm) (Figure 2).…”

“…Phosphorescent CPL-active Pt(II) complexes are known for their high emission quantum yield and large g lum values, and they hold promise for use in novel optoelectronic devices. To obtain more efficient CPL materials, helicene skeleton (Shen et al, 2014;Biet et al, 2017), 1,1 ′ -binaphthyls (Song J. et al, 2018;Song et al, 2019;Jiang et al, 2020), and other moieties were incorporated into phosphorescent Pt(II) systems, and a distinct enhancement in the phosphorescence and g lum value can be reached. Chiralat-metal phosphorescent Pt(II) complexes have been prepared by utilizing trans-spanning bipyridyl (Schulte et al, 2017) and substituted (2-thienyl)pyridine ligands (Usuki et al, 2019), displaying strong spectral responses both in circular dichroism (CD) and CPL.…”

Beyond Chiral Organic (p-Block) Chromophores for Circularly Polarized Luminescence: The Success of d-Block and f-Block Chiral Complexes

“…The impressive g el is sensitive to weak structural modifications since the similar complex 27 showed much weaker values (Yan et al, 2019b ). Motivated by the seminal work of Crassous and coworkers, numerous chiral Pt II complexes for CPL studies were synthesized with the help of bidentate ligands possessing helical chirality ( 27 – 28 , Figure 9A ) (Biet et al, 2017 ), central chirality ( 29 – 31 , Figure 9B ) (Ionescu et al, 2017 ; Lu et al, 2017 ; Usuki et al, 2019 ), or axial chirality ( 32 – 33 , Figure 9C ) (Song J. et al, 2018 ; Song et al, 2019 ).…”

Ultralow‐Molecular‐Weight Stimuli‐Responsive and Multifunctional Supramolecular Gels Based on Monomers and Trimers of Hydrazides

“…(1 : 1). [14] For the purpose of the mechanism evaluation, the 15 reference substances that have similar chemical structures with the hydrazide gelators but can't form gels were prepared as well.…”

“…Owing to the same reason, the racemic G-Cy-o has different diffraction signals from enantiopure G-(R,R)Cy-o as well. [14] On the same time, the diffraction signals of racemic G-Cy-o are much sharper and stronger than those of enantiopure G-(R,R)Cy-o, and thus the former would pack closely and orderly, like left and right band, and consequently be easy for crystal growth. For G-Ph-o xerogels, the peak (2θ = 6.7°) corresponds to d = 13.18 Å that is molecular size of its trimer (13.18 Å, Figure 4).…”