Helical Folding of π-Conjugated Polymers Bearing Glucose-Linked Biphenyl Units in the Main Chain: Application to Circularly Polarized Luminescence Materials

2017 ◽  
Vol 90 (8) ◽  
pp. 910-918 ◽  
Author(s):  
Tomoyuki Ikai ◽  
Sho Shimizu ◽  
Tomoya Kudo ◽  
Katsuhiro Maeda ◽  
Shigeyoshi Kanoh
Keyword(s):  
Conjugated Polymers ◽  
Main Chain ◽  
Circularly Polarized ◽  
Circularly Polarized Luminescence ◽  
Polarized Luminescence ◽  
Helical Folding

scholarly journals Synchronization in Non-Mirror-Symmetrical Chirogenesis: Non-Helical π–Conjugated Polymers with Helical Polysilane Copolymers in Co-Colloids

Symmetry ◽  
2021 ◽  
Vol 13 (4) ◽  
pp. 594
Author(s):  
Michiya Fujiki ◽  
Shun Okazaki ◽  
Nor Azura Abdul Rahim ◽  
Takumi Yamada ◽  
Kotohiro Nomura
Keyword(s):  
Conjugated Polymers ◽  
Mirror Symmetry ◽  
Main Chain ◽  
Fundamental Question ◽  
Type I ◽  
Type Ii ◽  
Circularly Polarized ◽  
Chain Stiffness ◽  
Circularly Polarized Luminescence ◽  
Polarized Luminescence

A curious question is whether two types of chiroptical amplifications, called sergeants-and-soldiers (Ser-Sol) and majority-rule (Maj) effects, between non-charged helical copolymers and non-charged, non-helical homopolymers occur when copolymer encounter homopolymer in co-colloids. To address these topics, the present study chose (i) two helical polysilane copolymers (HCPSs) carrying (S)- or (R)-2-methylbutyl with isobutyl groups as chiral/achiral co-pendants (type I) and (S)- and (R)-2-methylbutyl groups as chiral/chiral co-pendants (type II) and (ii) two blue luminescent π-conjugated polymers, poly[(dioctylfluorene)-alt-(trans-vinylene)] (PFV8) and poly(dioctylfluorene) (PF8). Analyses of circular dichroism (CD) and circularly polarized luminescence (CPL) spectral datasets of the co-colloids indicated noticeable, chiroptical inversion in the Ser-Sol effect of PFV8/PF8 with type I HCPS. PF8 with type IIHCPS showed the anomalous Maj rule with chiroptical inversion though PFV8 with type IIHCPS was the normal Maj effect. The noticeable non-mirror-symmetric CD-and-CPL characteristics and marked differences in hydrodynamic sizes of these colloids were assumed to originate from non-mirror-symmetrical main-chain stiffness of HCPSs in dilute toluene solution. The present chirality/helicity transfer experiments alongside of previous/recent publications reported by other workers and us allowed to raise the fundamental question; is mirror symmetry on macroscopic levels in the ground and photoexcited states rigorously conserved?

Circularly Polarized Luminescence from Supramolecular Chiral Complexes of Achiral Conjugated Polymers and a Neutral Polysaccharide

2009 ◽  
Vol 38 (3) ◽  
pp. 254-255 ◽  
Author(s):  
Shuichi Haraguchi ◽  
Munenori Numata ◽  
Chun Li ◽  
Yoko Nakano ◽  
Michiya Fujiki ◽  
...  
Keyword(s):  
Conjugated Polymers ◽  
Chiral Complexes ◽  
Circularly Polarized ◽  
Circularly Polarized Luminescence ◽  
Polarized Luminescence

Circularly Polarized Luminescence from Supramolecular Chiral Complexes of Achiral Conjugated Polymers and a Neutral Polysaccharide

2010 ◽  
Vol 39 (1) ◽  
pp. 76-76 ◽  
Author(s):  
Shuichi Haraguchi ◽  
Munenori Numata ◽  
Chun Li ◽  
Yoko Nakano ◽  
Michiya Fujiki ◽  
...  
Keyword(s):  
Conjugated Polymers ◽  
Chiral Complexes ◽  
Circularly Polarized ◽  
Circularly Polarized Luminescence ◽  
Polarized Luminescence

Circularly polarized luminescence spectroscopy

1977 ◽  
Vol 77 (6) ◽  
pp. 773-792 ◽  
Author(s):  
Frederick S. Richardson ◽  
James P. Riehl
Keyword(s):  
Luminescence Spectroscopy ◽  
Circularly Polarized ◽  
Circularly Polarized Luminescence ◽  
Polarized Luminescence

Blue Circularly Polarized Luminescent Amorphous Molecules with Single-handed Propeller Chirality Induced by Circularly Polarized Light Irradiation

2021 ◽  
Author(s):  
Zhaoming Zhang ◽  
Takunori Harada ◽  
Adriana Pietropaolo ◽  
Yuting Wang ◽  
Yue Wang ◽  
...  
Keyword(s):  
Polarized Light ◽  
Light Irradiation ◽  
Circularly Polarized Light ◽  
Circularly Polarized ◽  
Trigonal Symmetry ◽  
Circularly Polarized Luminescence ◽  
Polarized Luminescence

Preferred-handed propeller conformation was induced by circularly polarized light irradiation to three amorphous molecules with trigonal symmetry, and the molecules with induced chirality efficiently exhibited blue circularly polarized luminescence. In...

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