Guanine–oligothiophene conjugates: liquid-crystalline properties, photoconductivities and ion-responsive emission of their nanoscale assemblies

Gan, Kian Ping; Yoshio, Masafumi; Sugihara, Yoko; Kato, Takashi

doi:10.1039/c7sc03764c

Cited by 30 publications

(28 citation statements)

References 56 publications

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“…The FTIR spectrum of the guanine powder is in agreement with the literature values . In contrast, the FTIR spectrum of the ePG is distinctively different: i) it reveals broad polaronic bands between 3536 and 2854 cm −1 that partly also overlap with hydrogen‐bonding pointing at the formation of a conducting polymers (similar to PANI‐emeraldine) and ii) additionally, the presence of free charge careers is indicated by the intense infrared activated vibrations (IRAVs) in the region between 1070 cm −1 and 840 cm −1 .…”

Section: Resultsmentioning

confidence: 99%

Cofunction of Protons as Dopant and Reactant Activate the Electrocatalytic Hydrogen Evolution in Emeraldine‐Polyguanine

Coskun

Aljabour

Schöfberger

et al. 2019

Adv Materials Inter

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Functional conductive polymers represent an emerging class of nonmetallic electrocatalysts attractive to substitute scarce and expensive elements used today. Here the synthesis of emeraldine‐polyguanine as structural‐molecular analog to polyaniline is shown and the conducting biopolymer as molecular hydrogen electrocatalyst is applied. The polymerized and protonated nucleobase aids the catalytic electroreduction of protons over a peculiar mechanism, where, over amino‐association, protons coserve as dopant and reactant. In acidic media the electrocatalytic evolution of hydrogen at a Tafel slope of 79 mV dec−1 at 290 mV overpotential (10 mA cm−2) is reported. The 140h initial stability test demonstrates that the functionality of polymerized nucleobases can be harnessed for heterogeneous catalysis, i.e., as here demonstrated for the electroconversion of hydrogen.

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Section: Resultsmentioning

confidence: 99%

Cofunction of Protons as Dopant and Reactant Activate the Electrocatalytic Hydrogen Evolution in Emeraldine‐Polyguanine

Coskun

Aljabour

Schöfberger

et al. 2019

Adv Materials Inter

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“…Gribbon formation leads to bicontinuous cubic phase rarely observed for πconjugated liquid crystals 98 . Gquartets have also been used to formulate organogels and hydrogels, assembled in organic solvents or aqueous media, respectively.…”

Section: Wwwnaturecom/natrevchemmentioning

confidence: 93%

Applications of guanine quartets in nanotechnology and chemical biology

2019

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“…Usually, the value of charge mobility is invarient of temperature for a particular mesophase regime, however, Kato et al . have shown the temperature dependent nature of mobility but physical mechanism behind this characteristic is not discussed . We found that the charge carrier mobility increases with increasing temperature following a power law …”

Section: Charge Carrier Mobilitymentioning

confidence: 82%

Charge Transport in Novel Phenazine Fused Triphenylene Supramolecular Systems

et al. 2018

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Novel phenazine-fused triphenylene discotic liquid crystals (DLCs) tethered with alkanethiols and alkoxy chains are synthesized. The condensation of 4,5-dibromobenzene-1,2diamine with triphenylene-1,2-diquinone discotic core, followed by the reaction with alkanethiols gives heterocyclic phenazinefused triphenylene based DLCs. The intermediate dibromosubstituted phenazine and final alkanethiol substituted phenazine-fused triphenylene derivatives exhibit a wide range of stable enantiotropic hexagonal columnar phase, which was characterised by polarized optical microscopy (POM), differential scanning calorimetry (DSC) and X-ray diffraction (XRD) studies. We have also investigated the photophysical properties of all phenazine compounds using dilute solution of anhydrous chloroform. The charge carrier mobility was measured for one representative compound by time of flight method which revealed that phenazine-fused triphenylene discotic mesogen exhibits p-type (hole) mobility of the order of 10 À4 cm 2 V À1 s À1 . The novel mesogens reported here present a wide temperature stability with good charge mobility and optical properties. These mesogens have shown potential applications for solar cells, sensors, organic light emitting diodes and other electrooptical device applications.[a] A.

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Guanine–oligothiophene conjugates: liquid-crystalline properties, photoconductivities and ion-responsive emission of their nanoscale assemblies

Abstract: Liquid-crystalline conjugated guanine–oligothiophene derivatives show electron or ambipolar carrier transport properties and ion-induced phase transition accompanied by a luminescence colour change.

Cited by 30 publications

References 56 publications

Cofunction of Protons as Dopant and Reactant Activate the Electrocatalytic Hydrogen Evolution in Emeraldine‐Polyguanine

Cofunction of Protons as Dopant and Reactant Activate the Electrocatalytic Hydrogen Evolution in Emeraldine‐Polyguanine

Applications of guanine quartets in nanotechnology and chemical biology

Charge Transport in Novel Phenazine Fused Triphenylene Supramolecular Systems

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