Tuneable and low cost molecular electronics

Organic Polyradicals as Redox Mediators: Effect of Intramolecular Radical Interactions on Their Efficiency

Autores: Elena Badetti*, Vega Lloveras, Emanuele Amadio, Rosalia Di Lorenzo, Mara Olivares-Marín, Alvaro Y. Tesio, Songbai Zhang, Fangfang Pan, Kari Rissanen, Jaume Veciana, Dino Tonti*, Jose Vidal-Gancedo*, Cristiano Zonta, and Giulia Licini*
Citation:
ACS Appl. Mater. Interfaces 2020, 12, 41, 45968–45975
Publication Date:September 15, 2020
DOI:https://pubs.acs.org/doi/10.1021/acsami.0c09386
PlumX: Organic Polyradicals as Redox Mediators: Effect of Intramolecular Radical Interactions on Their Efficiency

The spin–spin interactions between unpaired electrons in organic (poly)radicals, especially nitroxides, are largely investigated and are of crucial importance for their applications in areas such as organic magnetism, molecular charge transfer, or multiple spin labeling in structural biology. Recently, 2,2,6,6-tetramethylpiperidinyloxyl and polymers functionalized with nitroxides have been described as successful redox mediators in several electrochemical applications; however, the study of spin–spin interaction effect in such an area is absent.

Molecular

  • Hits: 317

Metallacarboranes as Photoredox Catalysts in Water

Autores: Isabel Guerrero, Dr. Zsolt Kelemen, Prof. Dr. Clara Viñas, Dr. Isabel Romero, Prof. Dr. Francesc Teixidor
Citation:

Chem. Eur. J. 202026, 5027
DOI: https://doi.org/10.1002/chem.201905395

PlumX: Metallacarboranes as Photoredox Catalysts in Water
Metallacarboranes with the shape of the Greek letter θ, such as [Co(C2B9H11)2], were tested, for the first time, as efficient photoredox catalysts in the oxidation of aromatic and aliphatic alcohols in water. Their efficiency is linked to their high solubility in water, their high oxidizing power (Co4+/3+), and their absence of fluorescence on excitation, among others.

Molecular

  • Hits: 401

Resistive Switching Observation in a Gallium-Based Liquid Metal/Graphene Junction

Autores: Diego Gutiérrez, Jesús Alejandro de Sousa, Marta Mas-Torrent, and Núria Crivillers*
Citation:
ACS Appl. Electron. Mater. 2020, 2, 10, 3093–3099
Publication Date:September 13, 2020 
https://doi.org/10.1021/acsaelm.0c00296
PlumX: Resistive Switching Observation in a Gallium-Based Liquid Metal/Graphene Junction
Resistive switching effect is observed for a gallium–indium/gallium oxide/graphene junction. The use of a gallium-based liquid metal (LM) alloy, in this case, the eutectic gallium–indium with its native gallium oxide skin, directly provides the metal top contact and the oxide layer needed to fabricate a memory.

Molecular

  • Hits: 512

Stability of radical-functionalized gold surfaces by self-assembly and on-surface chemistry

Autores: Tobias Junghoefer, Ewa Malgorzata Nowik-Boltyk, J. Alejandro de Sousa, Erika Giangrisostomi, Ruslan Ovsyannikov, Thomas Chassé, Jaume Veciana, Marta Mas-Torrent, Concepció Rovira, Núria Crivillers and Maria Benedetta Casu *
Citation: Chem. Sci., 2020,11, 9162-9172
DOI: https://doi.org/10.1039/D0SC03399E
PlumX: Stability of radical-functionalized gold surfaces by self-assembly and on-surface chemistry
We have investigated the radical functionalization of gold surfaces with a derivative of the perchlorotriphenylmethyl (PTM) radical using two methods: by chemisorption from the radical solution and by on-surface chemical derivation from a precursor.

Molecular

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Electrocatalytic oxidative Z/E isomerization of a stilbene favoured by the presence of an electroactive persistent radical

Autores: Paula Mayorga-Burrezo, * Christian Sporer, J. Alejandro de Sousa, Nicola Capra, Klaus Wurst, Núria Crivillers, Jaume Veciana and  Concepció Rovira *.
Citation: Chem. Commun., 2020, Advance Article
DOI: https://doi.org/10.1039/D0CC04973E
PlumX: Electrocatalytic oxidative Z/E isomerization of a stilbene favoured by the presence of an electroactive persistent radical

A push–pull-functionalized stilbene has been prepared, with an electroactive perchlorotriphenylmethyl (PTM˙) radical and dimethylamine units as electron-withdrawing and -donating moieties, respectively, showing an electrocatalytic redox-induced Z → E isomerization where the open-shell nature of PTM˙ plays a key role in the isomerization ocurrance.

Molecular

  • Hits: 462

Nanoscale Mapping of the Conductivity and Interfacial Capacitance of an Electrolyte‐Gated Organic Field‐Effect Transistor under Operation

Título : Nanoscale Mapping of the Conductivity and Interfacial Capacitance of an Electrolyte‐Gated Organic Field‐Effect Transistor under Operation
Autores: Adrica Kyndiah, Martí Checa, Francesca Leonardi, Ruben Millan‐Solsona, Martina Di Muzio, Shubham Tanwar, Laura Fumagalli, Marta Mas‐Torrent, Gabriel Gomila
Citation: Adv. Funct. Mater. 2020, 2008032. 
DOI: https://doi.org/10.1002/adfm.202008032
PlumX: Nanoscale Mapping of the Conductivity and Interfacial Capacitance of an Electrolyte‐Gated Organic Field‐Effect Transistor under Operation
Probing nanoscale electrical properties of organic semiconducting materials at the interface with an electrolyte solution under externally applied voltages is key in the field of organic bioelectronics. It is demonstrated that the conductivity and interfacial capacitance of the active channel of an electrolyte‐gated organic field‐effect transistor (EGOFET) under operation can be probed at the nanoscale using scanning dielectric microscopy in force detection mode in liquid environment.

Molecular

  • Hits: 487

Label-free immunodetection of α-synuclein by using a microfluidics coplanar electrolyte-gated organic field-effect transistor

Título : Label-free immunodetection of α-synuclein by using a microfluidics coplanar electrolyte-gated organic field-effect transistor
Autores: Simona Ricci, Stefano Casalini, Vitaliy Parkula, Meenu Selvaraj, Gulseren Deniz Saygin, Pierpaolo Greco, Fabio Biscarini, Marta Mas-Torrent
Citation: Biosensors and Bioelectronics Volume 167, 1 November 2020,  112433. 
DOI: https://doi.org/10.1016/j.bios.2020.112433

PlumX: Label-free immunodetection of α-synuclein by using a microfluidics coplanar electrolyte-gated organic field-effect transistor

The aggregation of α-synuclein is a critical event in the pathogenesis of neurological diseases, such as Parkinson or Alzheimer. Here, we present a label-free sensor based on an Electrolyte-Gated Organic Field-Effect Transistor (EGOFET) integrated with microfluidics that allows for the detection of amounts of α-synuclein in the range from 0.25 pM to 25 nM. The lower limit of detection (LOD) measures the potential of our integrated device as a tool for prognostics and diagnostics.

Molecular

  • Hits: 753

Enhancing Long‐Term Device Stability Using Thin Film Blends of Small Molecule Semiconductors and Insulating Polymers to Trap Surface‐Induced Polymorphs

Autores: Tommaso Salzillo, Antonio Campos, Adara Babuji, Raul Santiago, Stefan T. Bromley, Carmen Ocal, Esther Barrena, Rémy Jouclas, Christian Ruzie, Guillaume Schweicher, Yves H. Geerts, Marta Mas‐Torrent.
Citation: Adv. Funct. Mater.2020, 2006115. 
https://doi.org/10.1002/adfm.202006115
PlumX: Enhancing Long‐Term Device Stability Using Thin Film Blends of Small Molecule Semiconductors and Insulating Polymers to Trap Surface‐Induced Polymorphs

The lack of long‐term stability in thin films of organic semiconductors can often be caused by the low structural stability of metastable phases that are frequently formed upon deposition on a substrate surface. Here, thin films of 2,7‐dioctyloxy[1]benzothieno[3,2‐b]benzothiophene (C8O‐BTBT‐OC8) and blends of this material with polystyrene by solution shearing are fabricated.

Molecular

  • Hits: 511

Conservation of structural arrangements and 3:1 stoichiometry in a series of crystalline conductors of TMTTF, TMTSF, BEDT-TTF, and chiral DM-EDT-TTF with the oxo-bis[pentafluorotantalate(V)] dianion

Autores: Nabil Mroweh, Cécile Mézière, Magali Allain, Pascale Auban-Senzier, Enric Canadell * and Narcis Avarvari *.
Citation: Chem. Sci., 2020, 11, 10078-10091. 
DOI: 10.1039/D0SC03665J
PlumX: Conservation of structural arrangements and 3[thin space (1/6-em)]:[thin space (1/6-em)]1 stoichiometry in a series of crystalline conductors of TMTTF, TMTSF, BEDT-TTF, and chiral DM-EDT-TTF with the oxo-bis[pentafluorotantalate(V)] dianion

The occurrence of isostructural conducting radical cation salts of diversely substituted tetrathiafulvalene (TTF) precursors with the same anion is most often limited to very similar derivatives such as tetramethyl-tetrathiafulvalene (TMTTF) and tetramethyl-tetraselenafulvalene (TMTSF).

Molecular

  • Hits: 547

Neutral Organic Radical Formation by Chemisorption on Metal Surfaces

Autores: M. R. Ajayakumar, César Moreno*, Isaac Alcón, Francesc Illas, Concepció Rovira, Jaume Veciana, Stefan T. Bromley*, Aitor Mugarza, and Marta Mas-Torrent*.
Citation: J. Phys. Chem. Lett. 2020, 11, 10, 3897–3904. 
DOI: https://doi.org/10.1021/acs.jpclett.0c00269
PlumX: Neutral Organic Radical Formation by Chemisorption on Metal Surfaces

Organic radical monolayers (r-MLs) bonded to metal surfaces are potential materials for the development of molecular (spin)electronics. Typically, stable radicals bearing surface anchoring groups are used to generate r-MLs.

Molecular

  • Hits: 493

Surface specificity and mechanistic pathway of de-fluorination of C60F48 on coinage metals

Título : Surface specificity and mechanistic pathway of de-fluorination of C60F48 on coinage metals
Autores: Rogger Palacios-Rivera, David C. Malaspina, Nir Tessler, Olga Solomeshch, Jordi Faraudo,* Esther Barrena* and Carmen Ocal.
Citation: Nanoscale Adv., 2020, Advance Article. 
https://doi.org/10.1039/D0NA00513D
PlumX: Surface specificity and mechanistic pathway of de-fluorination of C60F48 on coinage metals

We provide experimental and theoretical understanding on fundamental processes taking place at room temperature when a fluorinated fullerene dopant gets close to a metal surface. By employing scanning tunneling microscopy and photoelectron spectroscopies, we demonstrate that the on-surface integrity of C60F48 depends on the interaction with the particular metal it approaches.

Molecular

  • Hits: 549

Selection of the two enantiotropic polymorphs of diF-TES-ADT in solution sheared thin film transistors

Autores: Tommaso Salzillo, Nieves Montes, Raphael Pfattner and Marta Mas-Torrent *
Citation: J. Mater. Chem. C, 2020, Advance Article
https://doi.org/10.1039/D0TC03222K
PlumX: Selection of the two enantiotropic polymorphs of diF-TES-ADT in solution sheared thin film transistors
We report the effect of solution shearing speed on the performances of diF-TES-ADT-based OFETs. X-ray diffraction reveals that th low-temperature phase is predominant at low shearing speed, while, upon increasing the speed, the high-tempertature phase prevails. The effect of polymorph composition on the electrical performances is reported with the best mobilities found in a mixture of the two polymorphs.

Molecular

  • Hits: 452

Dibenzocycloheptatriene as end-group of Thiele and tetrabenzo-Chichibabin hydrocarbons

Autores: Vicente G Jiménez, Paula Mayorga Burrezo, Victor Blanco, Vega Lloveras, Carlos J. Gomez Garcia, Tomas Solomek, Juan Manuel Cuerva, Jaume Veciana and Araceli G. Campaña
Citation: Chem. Commun., 2020, Accepted Manuscript. 
https://doi.org/10.1039/D0CC04489J
PlumX: Dibenzocycloheptatriene as end-group of Thiele and tetrabenzo-Chichibabin hydrocarbons

Thiele (Th) and tetrabenzo-Chichibabin (TBC) derivatives with terminal dibenzocycloheptatriene (DBHept) units were prepared. A clear correlation between their electronic and molecular structures was stablished. Insights into their closed- or open-shell ground states were gained, where particular contribution of the heptagonal carbocycles as end-groups was proved. Remarkably, a thermally accessible triplet diradical configuration was confirmed for the DBHept-TBC compound.

 

Molecular

  • Hits: 430

In Search of Chiral Molecular Superconductors: κ‐[(S,S)‐DM‐BEDT‐TTF]2ClO4 Revisited

Título : In Search of Chiral Molecular Superconductors: κ‐[(S,S)‐DM‐BEDT‐TTF]2ClO4 Revisited
Autores: Nabil Mroweh, Cécile Mézière, Flavia Pop, Pascale Auban‐Senzier, Pere Alemany, Enric Canadell ,Narcis Avarvari
Citation: Adv. Mater.202032, 2002811. 
https://doi.org/10.1002/adma.202002811
PlumX: In Search of Chiral Molecular Superconductors: κ‐[(S,S)‐DM‐BEDT‐TTF]2ClO4 Revisited

The relationship between chirality and superconductivity is an intriguing question. The two enantiomeric crystalline radical cation salts κ‐[(S,S)‐DM‐BEDT‐TTF]2ClO4 and κ‐[(R,R)‐DM‐BEDT‐TTF]2ClO4, showing κ‐type arrangement of the organic layers, are investigated in search for superconducting chiral molecular materials following a 1992 report indicating the occurrence of a superconducting transition in the former compound.

While the initial interpretation is presently challenged through in‐depth temperature and pressure dependent single crystal resistivity measurements combined with band structure calculations, the two chiral conductors show metal like behavior with room temperature conductivities of 10–30 S cm−1 at ambient pressure and stabilization of the metallic state down to the lowest temperatures under moderate pressures.

Molecular

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Exploiting the versatile alkyne-based chemistry for expanding the applications of a stable triphenylmethyl organic radical on surfaces

Jesús Alejandro de Sousa , Francesc Bejarano, Diego Gutiérrez, Yann Leroux, Ewa-Malgorzata Nowik Boltyk, Tobias Junghoefer, Erika Giangrisostomi, Ruslan Ovsyannikov, Maria Benedetta Casu, Jaume Veciana, Marta Mas-Torrent, Bruno Fabre, Concepció Rovira and Nuria Crivillers. Chem. Sci., 2019, Accepted Manuscript.  

Molecular

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