Joaquín Barberá

Universidad de Zaragoza

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José Luís Serrano

Universidad de Zaragoza

125

Mercedes Marcos

Universidad de Zaragoza

Raquel Giménez

Universidad de Zaragoza

Pilar Romero

Universidad de Zaragoza

Teresa Sierra

Instituto de Nanociencia y Materiales de Aragón

Ana Omenat

Universidad de Zaragoza

Robert Deschenaux

University of Neuchâtel

M. Blanca Ros

Universidad de Zaragoza

Anabel Elduque

Universidad de Zaragoza

Luís Oriol

Universidad de Zaragoza

Cooperative Institutions

Universidad de Zaragoza

146

Institut de l'Information Scientifique et Technique

135

Consejo Superior de Investigaciones Científicas

Centre National de la Recherche Scientifique

Instituto de Nanociencia y Materiales de Aragón

Universidad Autónoma de Madrid

University of Neuchâtel

Universidad Complutense de Madrid

Universitat de València

Centro Médico Sanitas Zaragoza

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Structural characterization and physical properties of new tetrabenzopentaphene mesogens

Journal of Materials Chemistry (2009)

Carmen M. Romero Diego Peña Dolores Pérez Enrique Guitián Roberto Termine

The synthesis, structural and mesomorphic properties of five tetrabenzopentaphene derivatives are presented. All the compounds exhibit columnar mesophases which have been characterized by optical microscopy, differential scanning calorimetry and X-ray diffraction. The thermogravimetric analysis of the ester derivatives reveals that they suffer a decomposition process to the anhydride derivative at temperatures above 200 °C. The influence of the length of the terminal alkyl chains on the mesomorphic behaviour of the compounds has been studied. The structural characterization of the compounds has been completed with the study of their aggregation in solution by means of NMR. The fluorescent properties of the compounds are reported as well as a preliminary study of the photoconductivity of one of them.

Thermogravimetric analysis

Characterization

Derivative (finance)

Polarized light microscopy

10.1039/b901260e

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Citations (10)

Highly ordered π-extended discotic liquid-crystalline triindoles

Journal of Materials Chemistry (2011)

Eva M. García‐Frutos Ana Omenat Joaquín Barberá José Luís Serrano Berta Gómez‐Lor

New π-extended discotic liquid crystals based on heptacyclic triindole have been synthesized and their mesomorphic behaviour investigated. The synthesis of π-extended compounds was carried out by oxidative cyclodehydrogenation of differently substituted star-shaped hexaaryltriindoles to afford the planar derivatives with an extended core. Extending the conjugation in these materials results in a significant increase in the order and range of the mesophases. The influence of the peripherally attached groups in the mesomorphic and electronic properties offers a great opportunity to further tune the properties of these compounds intended to their incorporation in devices.

Discotic liquid crystal

10.1039/c0jm04395h

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Citations (35)

Ionic Bent-Core Pillar[n]arenes: From Liquid Crystals to Nanoaggregates and Functional Applications

Chemistry of Materials (2024)

Iván Marín Martín Castillo‐Vallés R.I. Merino C. L. Folcia Joaquín Barberá

Herein, we report the first examples of supramolecular systems from bent-core-based pillar[

Pillar

10.1021/acs.chemmater.4c01952

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Thermophysical properties of 1-propylpyridinium tetrafluoroborate

The Journal of Chemical Thermodynamics (2011)

Iris Orosia Campos Bandrés Marı́a C. López Miguel Castro Joaquín Barberá Carlos Lafuente

Tetrafluoroborate

Isobaric process

Atmospheric temperature range

10.1016/j.jct.2011.08.015

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Citations (35)

Functional Carbazole Liquid‐Crystal Block Codendrimers with Optical and Electronic Properties

Chemistry - A European Journal (2014)

Ismael Gracia Beatriz Feringán José Luís Serrano Roberto Termine Attilio Golemme

Abstract The synthesis and characterisation of a family of block codendrimers consisting of highly versatile mesogenic and carbazole‐containing 2,2‐bis(hydroxymethyl)propionic acid (bis‐MPA) dendrons are reported. The liquid‐crystal behaviour was investigated by means of differential scanning calorimetry, polarised‐light optical microscopy and X‐ray diffraction. Depending on the chemical structure of the constituent dendrons, the codendrimers show lamellar or columnar mesophases. On the basis of the experimental results, models both at the molecular level and in the mesophase are proposed. The physical properties of the block codendrimers derived from the presence of the carbazole moiety in their structure were investigated: photoluminescence in solution and in the mesophase, electrochemical behaviour and hole transport. Electrodeposition of carbazole dendrons afforded a globular supramolecular conformation in which the mesogenic molecular side plays a key role.

Carbazole

Mesogen

Moiety

10.1002/chem.201404555

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Citations (21)

Ein neues Bauprinzip für diskotische Flüssigkristalle

Angewandte Chemie (1998)

Joaquín Barberá Олег А. Ракитин M. Blanca Ros Tomás Torroba

Kleine Moleküle vom Inden- und Pseudoazulentyp wie 1 bzw. 2 bilden kolumnare Mesophasen! Diese Verbindungen haben keine endständigen flexiblen Ketten, wie sie sonst bei entsprechenden Mesogenen vorhanden sind, sondern polarisierbare Chlor- und Schwefelatome oder eine polare Cyanogruppe, die als ungewöhnliche "weiche"︁ Bereiche zwischen den säulenförmigen Stapeln fungieren.

10.1002/(sici)1521-3757(19980202)110:3<308::aid-ange308>3.0.co;2-v

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Citations (49)

Chiral hexacatenar metallomesogens: supramolecular organization versus steric demand of chiral cores

Journal of Materials Chemistry (2002)

Matthias Lehmann Teresa Sierra Joaquín Barberá José Luís Serrano Robert A. Parker

Hexacatenar chiral oxazoline complexes were prepared in a stereospecific synthesis. Metals (Pd, Ni, Cu, Zn), lateral alkoxy chains (OC6H13, OC12H25), sterically demanding alkyl groups (CH3, C4H9) on the chiral rigid centre and the number of nuclei incorporated in the complex core (mononuclear, orthopalladated dinuclear) were varied in order to achieve supramolecular organization of the phasmid-like molecules in liquid crystal phases. Mesomorphic properties were not observed in neat materials, but phase diagrams of binary mixtures with TNF demonstrate that steric repulsion can be overcome by intercalation of the electron-acceptor TNF. In spite of the presence of six lateral chains, SmA phases were found exclusively. The structures of the SmA phases were found to have additional order with respect to SmA phases formed by calamitic molecules. Further examination of the complexes in host nematic materials demonstrated their use as chiral dopants to induce cholesteric LC phases.

Mesogen

Chirality

10.1039/b109487d

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Citations (21)

Highly Fluorescent Liquid-Crystalline Dendrimers Based on Borondipyrromethene Dyes

Chemistry of Materials (2009)

Stéphane Frein Franck Camerel Raymond Ziessel Joaquín Barberá Robert Deschenaux

Fluorescent mesomorphic materials have been synthesized by grafting difluoro-bora-diaza-s-indacene (F-Bodipy) onto first-, second-, and third-generation liquid-crystalline poly(aryl ester) dendrons functionalized with cyanobiphenyl units. The second- and third-generation dendrimers give rise to smectic A phases; the first-generation dendrimer shows a nematic phase and an unidentified phase. The supramolecular organization within the smectic A phase could be established from X-ray experiments: the dendritic core is oriented approximately parallel to the layer planes and the mesogenic units are oriented perpendicularly above and below the dendritic core; interdigitation occurs between neighboring layers. All the materials are highly fluorescent both in solution and in the mesophases. For the first-generation dendrimer, the formation of J-aggregates was detected. The higher-generation dendrons prevented the formation of aggregates. Therefore, the dendrons play the role of liquid-crystalline promoters and protective shells.

Mesogen

BODIPY

Columnar phase

10.1021/cm9008078

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Citations (46)

Designing liquid-crystalline dendronised hexa-adducts of [60]fullerene via click chemistry

Liquid Crystals (2017)

Julien Iehl Thi Lê Anh Nguyen Stéphane Frein Uwe Hahn Joaquín Barberá

Liquid-crystalline [60]fullerodendrimers were constructed via click chemistry based on the reaction between hexa-adducts of [60]fullerene (C60) bearing 12 azide groups and alkyne-terminated cyanobiphenyl dendrons of first- and second-generation. The structure of all the new compounds was confirmed by IR, UV, 1H and 13C NMR spectroscopies and mass spectrometry. The mesomorphic properties were studied by polarised optical microscopy, differential scanning calorimetry and small-angle X-ray scattering. The hexa-adduct of C60 functionalised with the first-generation dendrons gave rise to the formation of a smectic A phase and a rectangular columnar phase (c2mm symmetry) while the hexa-adduct of C60 decorated with the second-generation dendrons displayed only a rectangular columnar phase (c2mm symmetry). Our results show that the hexa-adduct of C60 is a unique synthetic platform for the design of fullerodendrimers and dendronised materials.

HEXA

Columnar phase

10.1080/02678292.2017.1336677

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Citations (9)

CCDC 1007417: Experimental Crystal Structure Determination

The Cambridge Structural Database (2014)

M. Jesús Pastor Iván Torres‐Moya Cristina Cebrián José R. Carrillo Ángel Díaz‐Ortiz

An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.

Crystal (programming language)

10.5517/cc12t9bj

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Citations (0)