Vice versa donor acceptor fluorene–ferrocene alternate copolymer: a twisted ribbon for electrical switching

“…Among the various donors, ferrocene is one of the widely used donors due to its excellent thermal and photochemical stability as well as strong NLO response [15a, b] . Ferrocene also undergoes facile oxidation, consequently, it has been widely used in building donor‐acceptor systems for charge separation and stabilization [15c–k] …”

Section: Figurementioning

confidence: 99%

Formation of Highly Efficient, Long‐Lived Charge Separated States in Star‐Shaped Ferrocene‐Diketopyrrolopyrrole‐Triphenylamine Donor–Acceptor–Donor Conjugates

Popli

Jang

Patil

et al. 2020

Chemistry A European J

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The significance of multiple number of donor-acceptor entities on ac entral electron donor in as tar-shaped molecular system in improvingl ight energy harvesting ability is reported.F or this, donor-acceptor-donor type conjugates comprised up to three entities ferrocenyl (Fc)-diketopyrrolopyrrole (DPP) onto ac entral triphenylamine (TPA), (4-6)b yt he Pd-catalyzedS onogashira cross-couplingr eactions have been newly synthesized and characterized. Donor-acceptor conjugates possessing diketopyrrolopyrrole (1 to 3 entities) onto the central triphenylamine, (1-3)s erved as reference dyads while monomericD PP and Fc-DPP served as controlc ompounds. Both DPP and Fc-DPP carrying conjugates exhibited red-shifted absorption compared to their respectivec ontrol compounds revealinge xistenceo fg round state interactions.F urthermore,D PP fluorescencei n4-6 was found to be quantitatively quenched while for 1-3,t his property varied between 73-65 %s uggesting occurrence moderate amountso fe xcited state events. The electrochemical investigationse xhibited an additional low potentialo xidation in the case of Fc-DPP-TPAb ased derivatives(4-6) [a] C.

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“…With conjugated fluorophore cores, FCN16 and FO16 are potential electroptic materials 36,37 . Their UV-vis and fluorescence spectra are shown in Fig.…”

Section: Spectra and π-π Stackingmentioning

confidence: 99%

Liquid crystal phase of counter-rotating staircases – A case of antiferrochirality

Li¹,

Gao²,

Zhang³

et al. 2021

Preprint

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Helical structures continue to inspire, and there is considerable temptation to attribute helicity to columnar liquid crystals (LC). While short isohelical sequences are undoubtedly present, and longer ones in chiral or chiral-doped compounds, the order is only short-range, equivalent to a paramagnet without or with field. However, here we report a confirmed example of a true LC phase of achiral compounds consisting of columns, each being a long-range homochiral helix. Long-range periodicity and isochirality are maintained by intercolumnar interaction. This orthorhombic LC, spacegroup Fddd, is discovered in compounds with either bent or straight rod-like pi-conjugated cores. There are 4 right and 4 left-handed ribbons or star-profiled columns per unit cell. The structure is equivalent to an antiferromagnet with twist replacing spins. A theory based on interacting quadrupoles confirms this structure as energetically favoured over alternatives. The findings open a new approach to homochirality in achiral compounds, with promising optical/chiroptical properties.

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Vice versa donor acceptor fluorene–ferrocene alternate copolymer: a twisted ribbon for electrical switching

Cited by 17 publications

References 28 publications

Clickable Azide-Functionalized Bromo-Aryl-Aldehydes – Synthesis and Photophysical Characterization

Clickable Azide-Functionalized Bromo-Aryl-Aldehydes – Synthesis and Photophysical Characterization

Formation of Highly Efficient, Long‐Lived Charge Separated States in Star‐Shaped Ferrocene‐Diketopyrrolopyrrole‐Triphenylamine Donor–Acceptor–Donor Conjugates

Liquid crystal phase of counter-rotating staircases – A case of antiferrochirality

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