18 research outputs found
Cholesteric aggregation at the quinoidal-to-diradical border enabled stable n-doped conductor
Resumen de la comunicaciónSemiconductor materials constitute the heart of solar cells since they are responsible of the photovoltaic effect. For this reason, the search of new materials to improve the efficiency and stability of these devices is on the focus of the organic electronics. These semiconductors are typically formed by p-doped materials. Despite the relative high abundance of molecules suitable for photovoltaic purposes, that is, able of absorbing light and allowing the transport of the new created charges through them, n-doped organic semiconductors are not plentiful due to their well-known ambient instability.Universidad de Málaga. Campus de Excelencia Internacional Andalucía Tec
Polyconjugation from molecular spectroscopy
Abstract de la comunicación oralThe discovery of the semiconducting properties of π-conjugated organic oligomers
and polymers has been a turning point in the development of new electronic devices
and transformed the study of these systems in an emerging research field. Since then,
many efforts have been devoted to generate structural features that bring about new
and outstanding properties for optoelectronics, spintronics and magnetic devices, nonlinear optics, or singlet fission processes. Since the behavior of the π-electrons
determines the properties of these molecules, establishing not only the electron
delocalization mechanism and its extension, but also which factors disturb the πelectron density is of utmost importance to enhance the proper performance of these
materials and develop ad hoc synthesis for desired application. In this context, the coexistence of alternative π-electron delocalization frameworks with the main linearly
conjugated sequence must be considered as the existence of contributing resonance
structures can modify significantly the optical, electronic and molecular properties of
the system under study.
In this communication, three different policonjugation patterns are addressed and
their influence on the π-systems is revealed through electronic and vibrational
spectroscopies. Through-bond π-electron delocalization is exemplified by molecules
with cross-conjugated and parallelly-conjugated frameworks. For the former, the two πconjugated pathways compete for the π-electron density in the common sections of the
molecule. Conversely, parallel π-conjugated sequences do not share any fragment. On
the other hand, through-space π-conjugation is demonstrated in spiro molecules, in
which a proper spatial configuration allows the interaction between π-conjugated
moieties disconnected by an insulating atom.RSEQ
Universidad de Málaga. Campus de Excelencia Internacional Andalucía Tec
Diradicals shaped by double pi-conjugation: contribution from molecular spectroscopy.
En general, se ha
encontrado que la deslocalización de los electrones π en las moléculas más pequeñas tiene lugar en los anillos de
benceno, mientras que para los oligómeros de mayor longitud, debido a la configuración capa abierto de su estado
electrónico fundamental, dicha deslocalización se produce preferentemente a través de los bordes tipo “silla” de la
molécula. Esta deslocalización da lugar a un comportamiento tipo poliacetilénico para los oligorilenos que
presentan un elevado carácter dirradical. La secuencia de π-conjugación lineal a través los bordes tipo “silla”
establece la conexión entre los dos centros radicalarios que explica la configuración singlete del estado
fundamental de estos sistemas, es decir, permite la activación del mecanismo de doble polarización de espín. El
estudio de estas familias permite el establecimiento de una serie de pautas generales acerca del comportamiento
de los electrones π en un sistema dirradical linealmente conjugado, de forma que en los capítulos siguientes se
evaluará su alteración con la presencia de secuencias π-conjugadas alternativas.La presente tesis doctoral está enfocada al estudio de las estructuras electrónica y molecular de
sistemas orgánicos que presentan varias secuencias de conjugación de los electrones π, así como de sus
propiedades ópticas y electrónicas y su uso potencial en dispositivos electrónicos orgánicos.
Para conseguir este propósito, las estructuras electrónicas y moleculares de siete sistemas diferentes han sido
caracterizadas mediante espectroscopía de absorción electrónica UV-Vis-NIR y espectroscopías vibracionales
Raman e IR. En todos los casos, los resultados obtenidos se han apoyado en cálculos químico-cuánticos, además
de emplearse técnicas alternativas cuando ha sido posible (como resonancia paramagnética electrónica,
conductancia de moléculas individuales o absorción de estados excitados). La investigación de estos sistemas
orgánicos se ha realizado atendiendo a los diferentes modos de conjugación de los electrones π que presentan. El
estudio de cada uno de estos modos ha sido abordado desde estructuras iniciales aromáticas y quinoides capaces
de experimentar una transformación hacia sistemas de capa abierta, es decir, dirradicales.
En la Sección A se ha realizado la caracterización de dos series de ciclopentaoligorrilenos linealmente
monoconjugados, una de ellas de carácter aromático (CP-nR) y la segunda, quinoide (nR-2N). El hecho de que
ambas familias presenten una transformación de capa cerrada a capa abierta en estado neutro al aumentar el
tamaño del oligómero ha permitido realizar una descripción completa del comportamiento de la densidad de
electrones π en una secuencia de conjugación lineal, tanto de carácter aromático como quinoide
Polyconjugation for Organic Electronics
Since the discovery of the semiconducting properties of π-conjugated organic oligomers
and polymers, many efforts have been devoted to generating structural features that
bring about new and outstanding properties for optoelectronics, spintronics and
magnetic devices, non-linear optics, or singlet fission processes. In this sense, the play
between the resonance and π-electron delocalization phenomena in π-conjugated
organic materials is the origin of their semiconducting behavior. For this reason,
establishing not only the electron delocalization mechanism and its extension, but also
which factors disturb the π-electron density is of utmost importance to enhance the
proper performance of the electronic devices and develop ad hoc synthesis for desired
application.Universidad de Málaga. Campus de Excelencia Internacional Andalucía Tech
Raman spectroscopy as a versatile tool to study organic biradicals
Since -conjugated organic molecules were probed as potential semiconducting materials, suitable for replacing the widely used silicon technologies, their structural, optical and conductive properties have been under study to improve their application in organic electronics and to make possible their ad hoc synthesis. In this sense, the modification of the -electron delocalization path is one of the available tools to tune the properties of the molecules to obtain the desired characteristics for the fabrication of these devices.
One of the parameters employed to tailor -conjugated organic molecules for organic electronics is the diradical character. A progressive change in the diradical contribution to the ground electronic state structure can tune some of the main system features, highlighting the HOMO-LUMO energy gap and the aggregation mode. The main drawback of this approach is the loss of chemical stability when increasing the diradical character of these molecules.
On the other hand, the -electron delocalization can be interrupted introducing a perpendicularly conjugated path. The competition of these two cross-conjugated patterns leads to a new 2-dimensional delocalization scenario that changes the electronic properties of the studied materials.
In this project, we present a stable quinoidal quaterthiophene diradical that possess outstanding stability and conductivity properties. [1] The combination of the diradical character together with the possibility to delocalize the electron density through two different perpendicular paths explain its exceptional behavior in comparison with the other members of the series, or with its linearly conjugated analogues. The balance between these two properties has been evaluated through UV-Vis-NIR electronic spectroscopy and Raman and IR vibrational spectroscopy in the neutral and charged forms of the target molecule and similar non-cross-conjugated samples.Universidad de Málaga. Campus de Excelencia Internacional Andalucía Tech
Direct Magnetic Evidence, Functionalization, and Low-Temperature Magneto-Electron Transport in Liquid-Phase Exfoliated FePS3
Magnetism and the existence of magnetic order in a material is determined by its dimensionality. In this regard, the recent emergence of magnetic layered van der Waals (vdW) materials provides a wide playground to explore the exotic magnetism arising in the two-dimensional (2D) limit. The magnetism of 2D flakes, especially antiferromagnetic ones, however, cannot be easily probed by conventional magnetometry techniques, being often replaced by indirect methods like Raman spectroscopy. Here, we make use of an alternative approach to provide direct magnetic evidence of few-layer vdW materials, including antiferromagnets. We take advantage of a surfactant-free, liquid-phase exfoliation (LPE) method to obtain thousands of few-layer FePS3 flakes that can be quenched in a solvent and measured in a conventional SQUID magnetometer. We show a direct magnetic evidence of the antiferromagnetic transition in FePS3 few-layer flakes, concomitant with a clear reduction of the Néel temperature with the flake thickness, in contrast with previous Raman reports. The quality of the LPE FePS3 flakes allows the study of electron transport down to cryogenic temperatures. The significant through-flake conductance is sensitive to the antiferromagnetic order transition. Besides, an additional rich spectra of electron transport excitations, including secondary magnetic transitions and potentially magnon-phonon hybrid states, appear at low temperatures. Finally, we show that the LPE is additionally a good starting point for the mass covalent functionalization of 2D magnetic materials with functional molecules. This technique is extensible to any vdW magnetic familyE.B. acknowledges funds from Ministerio de Ciencia e
Innovación in Spain (RTI2018-096075-A-C22, RYC2019-
028429-I). E.M.P. thanks the Spanish Ministerio de Ciencia
e Innovación (PID2020-116661RB-I00) and Comunidad de
Madrid (P2018/NMT-4367). M.G.H. and A.C.-G. acknowledge funds from European Union Horizon 2020 research and
innovation program (Graphene Core3-Grant agreement no.
881603 Graphene-based disruptive technologies), EU FLAGERA through the project To2Dox (JTC-2019-009), and
Comunidad de Madrid through the project CAIRO-CM
project (Y2020/NMT-6661). A.C.-G. also acknowledges
funding from the European Research Council (ERC) under
the European Union’s Horizon 2020 research and innovation
program (grant agreement no. 755655, ERC-StG 2017 project
2D-TOPSENSE) and the Ministry of Science and Innovation
(Spain) through the project PID2020-115566RB-I00.
M.L.R.G. acknowledges support by the Spanish Ministry of
Science and Innovation through Research Project PID 2020-
113753RB-100. The National Centre for Electron Microscopy
(ELECMI National Singular Scientific Facility) is also
acknowledge for provision of access to corrected aberration
microscopy facilities. CzechNanoLab Research Infrastructure
supported by MEYS CR (LM2018110) is acknowledge
A Trapezoidal Octacyanoquinoid Acceptor Forms Solution and Surface Products by Antiparallel Shape Fitting with Conformational Dipole Momentum Switch
A new compound (1) formed by two antiparallelly disposed tetracyano thienoquinoidal units has been synthesized and studied by electrochemistry, UV/Vis-NIR, IR, EPR, and transient spectroscopy. Self-assembly of 1 on a Au(111)
surface has been investigated by scanning tunneling microscopy. Experiments have been rationalized by quantum chemical
calculations. 1 exhibits a unique charge distribution in its anionic form, with a gradient of charge yielding a neat
molecular in-plane electric dipole momentum, which transforms out-of-plane after surface deposition due to twisted!
folded conformational change and to partial charge transfer from Au(111). Intermolecular van der Waals interactions and
antiparallel trapezoidal shape fitting lead to the formation of an optimal dense on Au(111) two-dimensional assembly of 1.
The realization of novel properties emerging upon electronic covalent coupling between chromophores (i.e., bichromophoric systems) is a critical issue for the development of photo- and electrically active systems.[1–3] In this regard, the
relative topology and orientation of the p-subchromophores, such as in A + B type p-systems in Figure 1, with 1D linear
conjugation, 2D parallel conjugation,[4] 3D orthogonal spiroconjugation[5] or 3D conjugation[6] are key factors. On the
other hand, studies of the distribution of the excess of charge in p-conjugated moieties in post-electron transfer events are
central issues in photophysics and photochemistry, in energy storage[7] and in organic electronics.[8] In addition to this
electronic provision, its embedment in different molecular forms is of relevance as these can define unique ways of shape
fitting in supramolecular and surface assemblies. Joint electronic and molecular shape designs thus allow to build
molecular-based synthons in a tailored manner towards new bulk and nano organized materials. (...)Funding for open access charge: Universidad de Málaga / CBUA. The authors thank the Spanish Ministry of Science, Innovation and Universities MCIU (projects CTQ2017-83531-R, RED2018-102815-T, MAT2017-85089-C2-1-R), Centro de Excelencia Severo Ochoa grants (SEV-2016-0686, SEV2015-0496 and FUNFUTURE CEX2019-000917-S) and the CAM (QUIMTRONIC-CM project Y2018/NMT-4783). We thank MINECO/FEDER of the Spanish Government (projects PGC2018-098533-B-100 and PID2019-109555GB-I00),
the Eusko Jaurlaritza (Basque Government, project PIBA19-0004) and the Junta de Andalucía, Spain (UMA18FEDERJA057). We also thank the Research Central Services (SCAI) of the University of Málaga and the Donostia International Physics Center (DIPC) Computer Center. We thank Dr. Juwon Oh and Prof. Donhgo Kim from the Spectroscopy Laboratory for Functional p-electronic Systems and Department of Chemistry, Yonsei University in Korea for the generous gift of the TRIR and UV/Vis transient absorption spectroscopy data
A Trapezoidal Octacyanoquinoid Acceptor Forms Solution and Surface Products by Antiparallel Shape Fitting with Conformational Dipole Momentum Switch
A new compound (1) formed by two antiparallelly disposed tetracyano thienoquinoidal units has been synthesized and studied by electrochemistry, UV/Vis-NIR, IR, EPR, and transient spectroscopy. Self-assembly of 1 on a Au(111) surface has been investigated by scanning tunneling microscopy. Experiments have been rationalized by quantum chemical calculations. 1 exhibits a unique charge distribution in its anionic form, with a gradient of charge yielding a neat molecular in-plane electric dipole momentum, which transforms out-of-plane after surface deposition due to twisted→folded conformational change and to partial charge transfer from Au(111). Intermolecular van der Waals interactions and antiparallel trapezoidal shape fitting lead to the formation of an optimal dense on Au(111) two-dimensional assembly of 1.The authors thank the Spanish Ministry of Science, Innovation and Universities MCIU (projects CTQ2017-83531-R, RED2018-102815-T, MAT2017-85089-C2-1-R), Centro de Excelencia Severo Ochoa grants (SEV-2016-0686, SEV-2015-0496 and FUNFUTURE CEX2019-000917-S) and the CAM (QUIMTRONIC-CM project Y2018/NMT-4783). We thank MINECO/FEDER of the Spanish Government (projects PGC2018-098533-B-100 and PID2019-109555GB-I00), the Eusko Jaurlaritza (Basque Government, project PIBA19-0004) and the Junta de Andalucía, Spain (UMA18FEDERJA057). We also thank the Research Central Services (SCAI) of the University of Málaga and the Donostia International Physics Center (DIPC) Computer Center. We thank Dr. Juwon Oh and Prof. Donhgo Kim from the Spectroscopy Laboratory for Functional π-electronic Systems and Department of Chemistry, Yonsei University in Korea for the generous gift of the TRIR and UV/Vis transient absorption spectroscopy data.Peer reviewe
Direct Magnetic Evidence, Functionalization, and Low-Temperature Magneto-Electron Transport in Liquid-Phase Exfoliated FePS3
[EN] Magnetism and the existence of magnetic order in a material is
determined by its dimensionality. In this regard, the recent emergence of magnetic
layered van der Waals (vdW) materials provides a wide playground to explore the
exotic magnetism arising in the two-dimensional (2D) limit. The magnetism of 2D
flakes, especially antiferromagnetic ones, however, cannot be easily probed by
conventional magnetometry techniques, being often replaced by indirect methods like
Raman spectroscopy. Here, we make use of an alternative approach to provide direct
magnetic evidence of few-layer vdW materials, including antiferromagnets. We take
advantage of a surfactant-free, liquid-phase exfoliation (LPE) method to obtain
thousands of few-layer FePS3 flakes that can be quenched in a solvent and measured
in a conventional SQUID magnetometer. We show a direct magnetic evidence of the
antiferromagnetic transition in FePS3 few-layer flakes, concomitant with a clear
reduction of the Néel temperature with the flake thickness, in contrast with previous
Raman reports. The quality of the LPE FePS3 flakes allows the study of electron transport down to cryogenic temperatures.
The significant through-flake conductance is sensitive to the antiferromagnetic order transition. Besides, an additional rich
spectra of electron transport excitations, including secondary magnetic transitions and potentially magnon-phonon hybrid
states, appear at low temperatures. Finally, we show that the LPE is additionally a good starting point for the mass covalent
functionalization of 2D magnetic materials with functional molecules. This technique is extensible to any vdW magnetic
family.Funds from Ministerio de Ciencia e Innovación in Spain (RTI2018-096075-A-C22, RYC2019-028429-I). E.M.P. thanks the Spanish Ministerio de Ciencia e Innovación (PID2020-116661RB-I00) and Comunidad de Madrid (P2018/NMT-4367). M.G.H. and A.C.-G. acknowledge funds from European Union Horizon 2020 research and
innovation program (Graphene Core3-Grant agreement no. 881603 Graphene-based disruptive technologies), EU FLAGACS ERA through the project To2Dox (JTC-2019-009), andComunidad de Madrid through the project CAIRO-CMproject (Y2020/NMT-6661). A.C.-G. also acknowledges
funding from the European Research Council (ERC) under
the European Union’s Horizon 2020 research and innovation
program (grant agreement no. 755655, ERC-StG 2017 project
2D-TOPSENSE) and the Ministry of Science and Innovation
(Spain) through the project PID2020-115566RB-I00.
M.L.R.G. acknowledges support by the Spanish Ministry of
Science and Innovation through Research Project PID 2020-
113753RB-100. The National Centre for Electron Microscopy
(ELECMI National Singular Scientific Facility) is also
acknowledge for provision of access to corrected aberration
microscopy facilities. CzechNanoLab Research Infrastructure
supported by MEYS CR (LM2018110) is acknowledged.Peer reviewe