The post Elementor #1623 appeared first on Nanoarchitectonics Lab.

Rakesh K. Pandey,Himani Pandey,Alpana Nayak

Abstract

A multilayered hybrid assembly of a discotic liquid crystal and DNA is found to show interesting electron transfer behavior. The film acts as a conducting bridge helping the transfer of electrons between the metal and ferrocene redox probe while not allowing the electron transfer for ferrocyanide/ferricyanide redox couple.

Abstract

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.

Supporting Information

As a service to our authors and readers, this journal provides supporting information supplied by the authors. Such materials are peer reviewed and may be re-organized for online delivery, but are not copy-edited or typeset. Technical support issues arising from supporting information (other than missing files) should be addressed to the authors.

Please note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article.

The post Electrochemical Charge Transfer Through the Supramolecular Discogen-DNA Hybrid Multi-layered Assembly appeared first on Nanoarchitectonics Lab.

Samapika Mallik,Dr. Alpana Nayak,Dr. Snehasis Daschakraborty,Prof. Sandeep Kumar,Prof. Kattera A. Suresh

First published: 03 July 2018 https://doi.org/10.1002/slct.201800601 Citations: 8

Abstract

Ionic self-assembly at interfaces is an attractive approach to obtain advanced functional materials without the need of elaborate covalent chemistry. Here, a novel discotic dimer-DNA complex hybrid system has been studied at air-water and air-solid interfaces. The compatibility in structure/property of discotic liquid crystals and DNA enables stable multilayer formation suitable for developing organic atomic switch devices.

Abstract

Nanoarchitectonics through ionic self-assembly at interfaces is an attractive approach to obtain advanced functional materials. Here, a novel discotic dimer-DNA complex hybrid system has been investigated at air-water and air-solid interfaces. The ionic discotic liquid crystalline dimer consisted of two triphenylene cores linked via alkyl spacer with a imidazolium moiety. At air-water interface, the dimer formed a stable monolayer with a reversible collapse. The surface manometry results suggested that the condensed phase of the monolayer consisted of molecules arranged in an edge-on conformation. To understand the folding behavior of the molecules, DFT calculations were carried out which showed that the quantum chemically optimized folded-form of the molecule was electronically more stable than its unfolded-form. Upon adding DNA to the subphase, a complex monolayer was formed with enhanced stability as was indicated by increased collapse pressure and decreased limiting area. Importantly, this complexation enabled an efficient and stable multilayer formation on silicon substrates with layers as many as 40. Since both DNA and discotic dimer molecules share common properties of one-dimensional charge transport with compatible structures, this complex film could serve as a model system for organic electronics.

Citing Literature

Number of times cited according to CrossRef: 8

• Samapika Mallik, Shakkira Erimban, Swamynathan Kaleeswaran, Sandeep Kumar, Snehasis Daschakraborty, Alpana Nayak, Unambiguous Determination of Electrostatically Driven Molecular Packing in a Triphenylene–Surfactant Complex Monolayer, Advanced Materials Interfaces, 10.1002/admi.202100187, 8, 13, (2021).Wiley Online Library
• Romain Berthiot, Nicolas Giudice, Laurent Douce, Luminescent Imidazolium Salts as Bright Multi‐Faceted Tools for Biology, European Journal of Organic Chemistry, 10.1002/ejoc.202100459, 2021, 29, (4099-4106), (2021).Wiley Online Library
• Arup Sarkar, K.A. Suresh, Prabhat Kumar, N. Jayaraman, Strain rate and temperature dependence of collapse pressure in Langmuir monolayer of cholesteryl dimers, Thin Solid Films, 10.1016/j.tsf.2021.138900, 735, (138900), (2021).Crossref
• Samapika Mallik, K. Swamynathan, Sandeep Kumar, Alpana Nayak, DNA-mediated molecular assembly of a triphenylene–surfactant complex monolayer, Colloids and Surfaces A: Physicochemical and Engineering Aspects, 10.1016/j.colsurfa.2021.127569, 630, (127569), (2021).Crossref
• Yu. I. Kuzin, V. V. Gorbatchuk, A. M. Rogov, I. I. Stoikov, G. A. Evtugyn, Electrochemical Properties of Multilayered Coatings Implementing Thiacalix[4]arenes with Oligolactic Fragments and DNA, Electroanalysis, 10.1002/elan.201900499, 32, 4, (715-723), (2019).Wiley Online Library
• Prakhar Verma, Shakkira Erimban, Nishant Kumar, Snehasis Daschakraborty, Alpana Nayak, Sandeep Kumar, Influence of Coulombic Interaction on the Interfacial Self-Assembly of Discotic Liquid Crystal Amphiphiles: A Combined Experimental and Computer Simulation Study, The Journal of Physical Chemistry C, 10.1021/acs.jpcc.9b02713, 123, 27, (16681-16689), (2019).Crossref
• Hoda Ahmed, Mohamed Hagar, Omaima Alhaddad, Phase Behavior and DFT Calculations of Laterally Methyl Supramolecular Hydrogen-Bonding Complexes, Crystals, 10.3390/cryst9030133, 9, 3, (133), (2019).Crossref
• Ksenia S. Egorova, Valentine P. Ananikov, Fundamental importance of ionic interactions in the liquid phase: A review of recent studies of ionic liquids in biomedical and pharmaceutical applications, Journal of Molecular Liquids, 10.1016/j.molliq.2018.09.025, 272, (271-300), (2018).Crossref

Supporting Information

As a service to our authors and readers, this journal provides supporting information supplied by the authors. Such materials are peer reviewed and may be re-organized for online delivery, but are not copy-edited or typeset. Technical support issues arising from supporting information (other than missing files) should be addressed to the authors.

Please note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article.

The post Supramolecular Self-Assembly of Ionic Discotic Liquid Crystalline Dimer with DNA at Interfaces appeared first on Nanoarchitectonics Lab.