Tuneable and low cost molecular electronics

Investigating the Ubiquitous Presence of Nanometric Water Films on Surfaces

Título : Investigating the Ubiquitous Presence of Nanometric Water Films on Surfaces
Autores: Sergio Santos*, Carlo Alberto Amadei, Chia-Yun Lai, Tuza Olukan, Jin-You Lu, Josep Font, Victor Barcons, Albert Verdaguer*, and Matteo Chiesa*
Citation and DOI:
J. Phys. Chem. C 2021, 125, 29, 15759–15772
Publication Date:June 25, 2021
DOI: https://doi.org/10.1021/acs.jpcc.1c03767
PlumX: Investigating the Ubiquitous Presence of Nanometric Water Films on Surfaces
When we speak of nanometric water films on surfaces we are speaking about a truly ubiquitous phenomenon in nature. All surfaces exposed to ambient conditions are covered by a thin film of water that affects or mediates surface chemistry, general physical-chemical processes on surfaces, and even solid–solid interactions.

Molecular

  • Hits: 56

Unusual stoichiometry, band structure and band filling in conducting enantiopure radical cation salts of TM-BEDT-TTF showing helical packing of the donors

Título : Unusual stoichiometry, band structure and band filling in conducting enantiopure radical cation salts of TM-BEDT-TTF showing helical packing of the donors
Autores: Flavia Pop, Cécile Mézière, Magali Allain, Pascale Auban-Senzier, Naoya Tajima, Daichi Hirobe, Hiroshi M. Yamamoto, Enric Canadell * and Narcis Avarvari *
Citation and DOI: J. Mater. Chem. C, 2021,9, 10777-10786
DOI: https://doi.org/10.1039/D1TC01112J
PlumX: Unusual stoichiometry, band structure and band filling in conducting enantiopure radical cation salts of TM-BEDT-TTF showing helical packing of the donors
Electrocrystallization of tetramethyl-bis(ethylenedithio)-tetrathiafulvalene (TM-BEDT-TTF) (1) as pure (S,S,S,S) and (R,R,R,R) enantiomers in the presence of (n-Bu4N)2(Mo6O19) and chloroform or bromoform afforded a series of four isostructural enantiopure radical cation salts [(S/R)-1]9(Mo6O19)5·(CHX3)2 (X = Cl, Br) crystallizing in the trigonal non-centrosymmetric space group R32.

Molecular

  • Hits: 169

From high quality packing to disordered nucleation or phase separation in donor/acceptor interfaces: ClAlPc-C60 on Au(111)

Título : From high quality packing to disordered nucleation or phase separation in donor/acceptor interfaces: ClAlPc-C60 on Au(111)
Autores: Esther Barrena, Rogger Palacios-Rivera, José I. Martínez and Carmen Ocal *
Citation and DOI: Phys. Chem. Chem. Phys., 2021,23, 14363-14371
DOI: https://doi.org/10.1039/D1CP01312B
PlumX: From high quality packing to disordered nucleation or phase separation in donor/acceptor interfaces: ClAlPc-C60 on Au(111)
The dramatic consequences that the orientation adopted by the molecular dipoles, in diverse arrays of chloroaluminum phthalocyanine (ClAlPc) on Au(111), have on the ulterior adsorption and growth of C60 are explored by means of an all scanning probe microscopy approach. The unidirectional downwards organization of the molecular dipoles at the first layer reduces charge transfer from the metal to C60. Imbalance between attractive and repulsive interactions of the fullerenes are crucial for their ordered supramolecular aggregation.

Molecular

  • Hits: 278

Synthesis of 2D Porous Crystalline Materials in Simulated Microgravity

Título : Synthesis of 2D Porous Crystalline Materials in Simulated Microgravity
Autores: Noemí Contreras-PeredaDavid Rodríguez-San-MiguelCarlos FrancoSemih SevimJoão Pedro ValeEduardo SolanoWye-Khay FongAlessandra Del GiudiceLuciano GalantiniRaphael Pfattner, Salvador PanéTiago Sotto Mayor, Daniel Ruiz-MolinaJosep Puigmartí-Luis
Citation and DOI:

Advanced Materials, Volume33, Issue30, July 28, 2021, 2101777
DOI: 10.1002/adma.202101777

PlumX: Synthesis of 2D Porous Crystalline Materials in Simulated Microgravity
To date, crystallization studies conducted in space laboratories, which are prohibitively costly and unsuitable to most research laboratories, have shown the valuable effects of microgravity during crystal growth and morphogenesis. Herein, an easy and highly efficient method is shown to achieve space-like experimentation conditions on Earth employing custom-made microfluidic devices to fabricate 2D porous crystalline molecular frameworks.

Molecular

  • Hits: 368

Rich Polymorphism of Layered NbS3

Título : Rich Polymorphism of Layered NbS3
Autores: Sergio Conejeros, Bogdan GusterPere AlemanyJean-Paul Pouget, and Enric Canadell
Citation and DOI:
Chem. Mater. 2021, 33, 14, 5449–5463
Publication Date:July 6, 2021
DOI: 10.1021/acs.chemmater.1c01417
PlumX: Rich Polymorphism of Layered NbS3
Layered group V transition-metal trichalcogenides are paradigmatic low-dimensional materials providing an ever increasing series of unusual properties. They are all based on the same basic building units, one-dimensional MX3 (M = Nb, Ta; X = S, Se) trigonal-prismatic chains that condense into layers, but their electronic structures exhibit significant differences leading to a broad spectrum of transport properties, ranging from metals with one, two, or three charge density wave instabilities to semimetals with potential topological properties or semiconductors.

Molecular

  • Hits: 377

Red light-emitting Carborane-BODIPY dyes: Synthesis and properties of visible-light tuned fluorophores with enhanced boron content

Título : Red light-emitting Carborane-BODIPY dyes: Synthesis and properties of visible-light tuned fluorophores with enhanced boron content
Autores:

Chiara Bellomo, Davide Zanetti, Francesca Cardano, Sohini Sinha, Mahdi Chaari, Andrea Fin, Andrea Maranzana, Rosario Núñez, Marco Blangetti, Cristina Prandi

Citation and DOI:

Dyes and Pigments
Volume 194, October 2021, 109644
DOI: 10.1016/j.dyepig.2021.109644

PlumX: Red light-emitting Carborane-BODIPY dyes: Synthesis and properties of visible-light tuned fluorophores with enhanced boron content
A small library of 2,6- and 3,5-distyrenyl-substituted carborane-BODIPY dyes was efficiently synthesized by means of a Pd-catalyzed Heck coupling reaction. Styrenyl-carborane derivatives were exploited as molecular tools to insert two carborane clusters into the fluorophore core and to extend the π-conjugation of the final molecule in a single synthetic step.

Molecular

  • Hits: 380

A Trapezoidal Octacyanoquinoid Acceptor Forms Solution and Surface Products by Antiparallel Shape Fitting with Conformational Dipole Momentum Switch

Título :

A Trapezoidal Octacyanoquinoid Acceptor Forms Solution and Surface Products by Antiparallel Shape Fitting with Conformational Dipole Momentum Switch

Autores:

Samara Medina Rivero, Javier Urieta-Mora, Agustín Molina-Ontoria, Cristina Martín-Fuentes, José I. Urgel, Maria Zubiria-Ulacia, Vega Lloveras, David Casanova, José I. Martínez, Jaume Veciana, David Écija, Nazario Martín, and Juan Casado

Citation and DOI:

Angew. Chem. Int. Ed. 2021, 60, 1 – 7
DOI: 10.1002/anie.202104294

PlumX: A Trapezoidal Octacyanoquinoid Acceptor Forms Solution and Surface Products by Antiparallel Shape Fitting with Conformational Dipole Momentum Switch

A new compound formed by two antiparallelly disposed tetracyano thienoquinoidal units has been synthesized and studied by electrochemistry and several spectroscopic techniques. Its self-assembly on a Au(111) surface has been investigated by scanning tunneling microscopy.

Molecular

  • Hits: 369

Allocation of Ambipolar Charges on an Organic Diradical with a Vinylene–Phenylenediyne Bridge

Título : Allocation of Ambipolar Charges on an Organic Diradical with a Vinylene–Phenylenediyne Bridge
Autores: Paula Mayorga-Burrezo, Francesc BejaranoJoaquín CalboXiaotao ZhaoJ. Alejandro De SousaVega LloverasMartin R. BryceEnrique OrtíJaume VecianaConcepció Rovira, and Núria Crivillers
Citation and DOI:
J. Phys. Chem. Lett. 2021, 12, 26, 6159–6164
DOI: 10.1021/acs.jpclett.1c01565
PlumX: Allocation of Ambipolar Charges on an Organic Diradical with a Vinylene-Phenylenediyne Bridge
Two redox and magnetically active perchlorotriphenylmethyl (PTM) radical units have been connected as end-capping groups to a bis(phenylene)diyne chain through vinylene linkers. Negative and positive charged species have been generated, and the influence of the bridge on their stabilization is discussed.

Molecular

  • Hits: 381

Oxidation processes at the surface of BaTiO3 thin films under environmental conditions

Título : Oxidation processes at the surface of BaTiO3 thin films under environmental conditions
Autores: I. Spasojević, G. Sautier, J. Caicedo, A. Verdaguer, N. Domingo
Citation and DOI: Applied Surface Science, 2021, 150288, ISSN 0169-4332,
https://doi.org/10.1016/j.apsusc.2021.150288
PlumX: Oxidation processes at the surface of BaTiO3 thin films under environmental conditions
Dissociation and adsorption of water on ferroelectric oxide surfaces play important role in the processes of screening and switching dynamics of ferroelectric polarization, as well as in catalytic processes which can be additionally coupled with light, temperature or vibration stimuli. In this work, we present XPS study of ferroelectric BaTiOthin films and determine the entanglement between surface chemistry, polarization direction and stability, by observing changes upon time exposure to environmental conditions, heating in Oatmosphere and irradiation in vacuum.

Molecular

  • Hits: 444

Advances in dynamic AFM: From nanoscale energy dissipation to material properties in the nanoscale

Autores: Sergio Santos, Karim Gadelrab, Chia-Yun Lai, Tuza Olukan, Josep Font, Victor Barcons, Albert Verdaguer, and Matteo Chiesa
Citation and DOI:

Journal of Applied Physics 129, 134302 (2021)
DOI: https://doi.org/10.1063/5.0041366

PlumX: Advances in dynamic AFM: From nanoscale energy dissipation to material properties in the nanoscale
Since the inception of the atomic force microscope (AFM), dynamic methods (dynamic atomic force microscopy) have been very fruitful by establishing methods to quantify dissipative and conservative forces in the nanoscale and by providing a means to apply gentle forces to the samples with high resolution. Here, we discuss developments that cover over a decade of our work on energy dissipation, phase contrast, and the extraction of relevant material properties from observables.

Molecular

  • Hits: 521

Conducting chiral nickel(ii) bis(dithiolene) complexes: structural and electron transport modulation with the charge and the number of stereogenic centres

Autores: Alexandre Abhervé, Nabil Mroweh, Thomas Cauchy, Flavia Pop, HengBo Cui, Reizo Kato, Nicolas Vanthuyne, Pere Alemany,  Enric Canadell * and Narcis Avarvari *
Citation and DOI:

J. Mater. Chem. C, 2021,9, 4119-4140
DOI: https://doi.org/10.1039/D1TC00439E

PlumX: Conducting chiral nickel(ii) bis(dithiolene) complexes: structural and electron transport modulation with the charge and the number of stereogenic centres
Nickel(II) bis(dithiolene) complexes can provide crystalline conducting materials either in their monoanionic or neutral forms. Here we show that the use of chiral dithiolene ligands with one or two stereogenic centres, together with variation of the counter-ion in the anionic complexes, represents a powerful strategy to modulate the conducting properties of such molecular materials.The chiral ligands 5-methyl-5,6-dihydro-1,4-dithiin-2,3-dithiolate (me-dddt) and 5,6-dimethyl-5,6-dihydro-1,4-dithiin-2,3-dithiolate (dm-dddt) have been generated from the thione precursors 1 and 2 which have been structurally and chiroptically characterized.

Molecular

  • Hits: 495

Interaction of Luminescent Defects in Carbon Nanotubes with Covalently Attached Stable Organic Radicals

Autores: Felix J. Berger, J. Alejandro de SousaJ. Alejandro de Sousa, Shen Zhao, Nicolas F. Zorn, Abdurrahman Ali El Yumin, Aleix Quintana García, Simon Settele, Alexander Högele, Núria Crivillers, and Jana Zaumseil*
Citation and DOI:
ACS Nano 2021, 15, 3, 5147–5157
Publication Date:February 18, 2021
https://doi.org/10.1021/acsnano.0c10341
PlumX: Interaction of Luminescent Defects in Carbon Nanotubes with Covalently Attached Stable Organic Radicals
The functionalization of single-walled carbon nanotubes (SWCNTs) with luminescent sp3 defects has greatly improved their performance in applications such as quantum light sources and bioimaging. Here, we report the covalent functionalization of purified semiconducting SWCNTs with stable organic radicals (perchlorotriphenylmethyl, PTM) carrying a net spin.

Molecular

  • Hits: 522

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 and DOI:
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: 692

Metallacarboranes as Photoredox Catalysts in Water

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

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: 771

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 and DOI:
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: 1051

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 and DOI: 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

  • Hits: 713

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 and DOI: 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: 795

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 and DOI: 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: 840

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 and DOI: 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: 1077

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 and DOI: 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: 784

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 and DOI: 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: 808

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 and DOI: 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: 894

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 and DOI: 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: 872

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 and DOI: 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: 744

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 and DOI: 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: 674

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 and DOI: 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

  • Hits: 827

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

  • Hits: 885

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