Electrical Conductivity Studies on Discotic Liquid Crystal−Ferrocenium Donor−Acceptor Systems

Kumar, P. Suresh; Kumar, Sandeep; Lakshminarayanan, V.

doi:10.1021/jp709704x

Cited by 34 publications

(21 citation statements)

References 63 publications

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“…26 The addition of electron acceptors such as TNF has been shown to increase the conductivity of DLCs. 12,23,27,28 On the other hand, it has been proposed that recombination processes limit the hole photocurrent in DLC-CT compounds. 29 Charge carriers in CT compounds are supposed to be trapped and readily annihilated through rapid, phonon-assisted relaxation and recombination processes.…”

Section: ■ Introductionmentioning

confidence: 99%

On the Morphology of a Discotic Liquid Crystalline Charge Transfer Complex

et al. 2012

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Discotic liquid crystalline (DLC) charge transfer (CT) complexes, which combine visible light absorption with rapid charge transfer characteristics within the CT complex, can have a great potential for photovoltaic applications when they can be made to self-assemble in a bulk heterojunction arrangement with separate channels for electron and hole conduction. However, the morphology of some liquid crystalline CT complexes has been under debate for many years. In particular, the liquid crystalline CT complex built from the electron acceptor 2,4,7-trinitro-9-fluorenone (TNF) and discotic molecules has been reported to have the TNF "sandwiched" either between the discotic molecules within the same column or between the columns within the aliphatic tails of the discotic molecules. We present a detailed structural study of the prototypic 1:1 mixture of the discotic 2,3,6,7,10,11-hexakis(hexyloxy)triphenylene (HAT6) and TNF. Nuclear magnetic resonance (NMR) line widths and cross-polarization rates are consistent with the picosecond time scale anisotropic thermal motions of the HAT6 and TNF molecules previously observed. By computational integration of Rietveld refinement analyses of neutron diffraction patterns with density experiments and short-range structural constraints from heteronuclear 2D NMR, we determine that the TNF molecules are vertically oriented between HAT6 columns. The data provide the insight that a morphology of separate hole conducting channels of HAT6 molecules can be realized in the liquid crystalline CT complex.

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Section: ■ Introductionmentioning

confidence: 99%

On the Morphology of a Discotic Liquid Crystalline Charge Transfer Complex

et al. 2012

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“…The bridge mediated electron transfer actually assists in the electron transfer process (Figure ). However, the electron transfer by tunneling depends upon the distance between the donor and acceptor sites ,. When the redox species are somewhat far away from the surface, the electron transfer would be slow, whereas, if the redox species are closer to the electrode surface electron transfer will be rapid, e. g. that in ferrocene due to its π‐electrons systems.…”

Section: Resultsmentioning

confidence: 99%

Electrochemical Charge Transfer Through the Supramolecular Discogen‐DNA Hybrid Multi‐layered Assembly

Pandey

Pandey²,

Nayak

2018

ChemistrySelect

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In the present work, charge transfer phenomenon through the films of an ionic discotic liquid crystal (discogen) that is pyridinium tethered with hexaalkoxytriphenylene (PyTp) and its complex with DNA (PyTp-DNA) was studied by using electrochemical methods. The PyTp and PyTp-DNA hybrid films were first formed at the air-water interface and then transferred onto the gold substrates by Langmuir-Blodgett (LB) technique. Electrochemical measurements carried out on these films in three different redox systems, namely, ferrocene, hexaammineruthenium (III), and ferrocyanide, revealed that the ferrocene and the hexaammineruthenium (III) systems allow the electron transfer reaction between redox probes and metal, whereas the ferrocyanide system completely blocks it. The electrochemical response of the films, in the former two systems, has been attributed to the bridge mediated electron transfer process, whereas, in the ferrocyanide system, the impermeability of redox ions through these LB films is responsible for the complete blocking of electron transfer. Based on the observed results, this work highlights the possibility of novel charge transfer properties of discogen-DNA type hybrid films for applications in molecular electronics.

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“…A number of dopants, such as bromine, iodine, AlCl 3 , NOBF 4 , trinitrofluorenone and ferrocenium ions, have previously been dispersed in DLCs to study the electrical conducting behavior of these materials. [20][21][22][23][24] However, the most remarkable effect was observed in the case of trinitrofluorenone doping. When a triphenylene-based DLC, namely hexahexylthiotriphenylene (HHTT), was doped with a small amount (0.62 mol %) of trinitrofluorenone, the conductivity parallel to the columnar axis (s || ) increased by a factor of 10 7 or more.…”

Section: Dlc-np Hybrid Systems S Kumarmentioning

confidence: 99%

Discotic liquid crystal-nanoparticle hybrid systems

Kumar

2014

NPG Asia Mater

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Discotic liquid crystals (DLCs) are nanomaterials with sizes ranging from 2 to 6 nm, and they are emerging as one-dimensional organic semiconducting materials. Recently, hybridization of these materials with various metallic and semiconducting nanoparticles (NPs) to alter and improve their properties has been realized. This article provides an overview of the developments in the field of newly immersed discotic nanoscience, a sub-field of liquid crystal (LC) nanoscience. As this field is also of great interest to readers without an LCs background, a brief introduction of the LC field is given first, with special emphasis on DLCs. This is followed by various DLC-NP hybrid systems. Finally, an outlook into the future of this newly emerging, fascinating and exciting field of discotic nanoscience research is provided.

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Electrical Conductivity Studies on Discotic Liquid Crystal−Ferrocenium Donor−Acceptor Systems

Cited by 34 publications

References 63 publications

On the Morphology of a Discotic Liquid Crystalline Charge Transfer Complex

On the Morphology of a Discotic Liquid Crystalline Charge Transfer Complex

Electrochemical Charge Transfer Through the Supramolecular Discogen‐DNA Hybrid Multi‐layered Assembly

Discotic liquid crystal-nanoparticle hybrid systems

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