Silvia Castro Fernández

• PhD in Organic Chemistry
• PostDoc Position at University of Santiago de Compostela

Makrozyklen In der Zuschrift auf S. 25428 berichten Thomas Frederiksen, Jose Ignacio Pascual, Diego Peña et al. über die Oberflächensynthese und die kollektiven Spinanregungen eines Nanostar‐Makrozyklus.

Macrocycles In their Communication on page 25224, Thomas Frederiksen, Jose Ignacio Pascual, Diego Peña et al. report the on‐surface synthesis and collective spin excitations of a triangulene‐based nanostar.

Triangulene nanographenes are open‐shell molecules with predicted high spin state due to the frustration of their conjugated network. Their long‐sought synthesis became recently possible over a metal surface. Here, we present a macrocycle formed by six [3]triangulenes, which was obtained by combining the solution synthesis of a dimethylphenyl‐anthr...

A star-shaped triangulene cyclic hexamer, which accumulates 12 unpaired electrons, was prepared by combining solution chemistry and on-surface synthesis. The resulting triangulene-based nanostar was visualized by bond-resolved scanning tunneling microscopy on a gold substrate. The collective spin excitations, explained by the Heisenberg model, were...

Triangulene nanographenes are open-shell molecules with predicted high spin state due to the frustration of their conjugated network. Their long-sought synthesis became recently possible over a metal surface. Here, we present a macrocycle formed by six [3]triangulenes, which was obtained by combining the solution synthesis of a dimethylphenyl-anthr...

Strukturdefekte sind ein möglicher Schlüssel für Fortschritte in der Nanographen‐Technologie. E. Maçôas, A. G. Campaña et al. zeigen in ihrem Forschungsartikel (DOI: 10.1002/ange.202000105), wie die Einführung eines Carbonyl‐substituierten heptagonalen Rings (Tropon) in ein Nanographenband die Effizienz der Upconversion‐Emission bei Zweiphotonenanr...

Understanding structural defects as potential advantages is the key for nanographene technology. In their Research Article (DOI: 10.1002/anie.202000105), E. Maçôas, A. G. Campaña, et al. show how the introduction of a carbonyl‐substituted heptagonal ring (tropone ring) into a nanographene ribbon increases the efficiency of upconverted emission by t...

The advantage of defects: The effect of a tropone moiety on the nonlinear optical properties of ribbon-shaped nanographenes is unequivocally demonstrated. Curved edges created by the inclusion of heptagonal carbocycles enhance the two-photon absorption on graphene molecules. Abstract A new family of distorted ribbon-shaped nanographenes was design...

A new family of distorted ribbon‐shaped nanographenes was designed, synthesized, and their optical and electrochemical properties were evaluated, pointing out an unprecedented correlation between their structural characteristics and the two‐photon absorption (TPA) responses and electrochemical band gaps. Three nanographene ribbons have been prepare...

We prove that the confinement of the conformational space of pyridoallenophanes leads to intense chiroptical responses. Unlike the cyclic dimer [142], single-conformation [141]pyridoallenophanes isomerize under thermal and photochemical conditions. Yet, less-strained [141]-bipyridoallenophanes are stable and are prepared successfully. They, unexpec...

A unique rippled nanographene consisting of 52 fused rings is presented in which six out‐of‐plane motifs are fully fused into a triangular aromatic surface with a size of approximately 2.5 nm. Three units of an unprecedented fully lateral π‐extended octabenzo[5]helicene together with three units of saddle‐shaped heptagonal rings are combined in a s...

Ein chirales Nanographen aus vier anellierten Hexabenzocoronen‐Einheiten wurde synthetisiert. Sechs gebogene Einheiten wurden an eine dreieckige aromatische Oberfläche gebunden, wodurch drei Octabenzo[5]helicene und drei Sattelkanten entstanden. Die zwei diastereomeren Enantiomerenpaare emittieren im roten Spektralbereich und haben bemerkenswerte c...

Fluorophores of the acridone family have been widely employed in many applications, such as DNA sequencing, the detection of biomolecules, and the monitoring of enzymatic systems, as well as being the bases of intracellular sensors and even antitumoral agents. They have been widely used in fluorescence imaging due to their excellent photophysical p...

The controlled preparation of well-defined distorted nanographenes by a bottom-up approach based on organic synthesis permits the direct establishment of unprecedented structure–property relationships in carbon nanostructures. The simultaneous incorporation of various defects in nanographenes affords highly curved structures with novel or enhanced...

The high sensitivity of chiroptical responses to conformational changes and supramolecular interactions has prompted an increasing interest in the development of chiroptical applications. However, prediction of and understanding the chiroptical responses of the necessary large systems may not be affordable for calculations at high levels of theory....

Racemic mixtures of boronic acid-derived salicylidenehydrazone (BASHY) complexes were enantiomerically resolved. The chiroptical properties of the stereoisomers, containing an asymmetric boron as the only stereogenic unit, are translated into mirror-imaged electronic circular dichroism spectra and circularly polarized luminescence (CPL, dissymmetry...

The high sensitivity of chiroptical responses to conformational changes and supramolecular interactions has prompted an increasing interest in the development of chiroptical applications. However, prediction and understanding the chiroptical responses of the necessary large systems may not be affordable for calculations at high levels of theory. In...

We report the synthesis and characterization of an enantiopure superhelicene nanographene constituted by two saddle‐shaped and one planar hexabenzocoronene (HBC) units arranged in a helicoidal shape. This is, to the best of our knowledge, the first undecabenzo[7]carbohelicene, i.e., the first fully π‐extended [7]helicene. Racemic resolution allowed...

We report the synthesis and characterization of an enantiopure superhelicene nanographene constituted by two saddle‐shaped and one planar hexabenzocoronene (HBC) units arranged in a helicoidal shape. This is, to the best of our knowledge, the first undecabenzo[7]carbohelicene, i.e., the first fully π‐extended [7]helicene. Racemic resolution allowed...

The high sensitivity of chiroptical responses to conformational changes and supramolecular interactions has prompted an increasing interest in the development of chiroptical applications. However, prediction and understanding the chiroptical responses of the necessary large systems may not be affordable for calculations at high levels of theory. In...

This feature article focuses on the bottom-up approaches (solution-phase) based on organic synthesis for the preparation of saddle-shaped distorted polycyclic aromatic hydrocarbons (PAHs). We summarise the recent progress on the synthetic strategies followed to obtain well-defined nanographenes containing heptagonal and octagonal carbocycles, highl...

Chiral molecules display a unique interaction with light. Here, it is presented the synthesis of two types of chiral structures based on spiro compounds, which show remarkable chiroptical activity. The structure of the (P2)-1 molecule (depicted in dark gray) shows a double helix formed by all-carbon atoms, while the (P4)-2 molecule (depicted in lig...

State-of-the-art chiroptical spectroscopies are valuable tools for structural elucidation. However, the potential of these spectroscopies for everyday applications has not been exploited to date partially due to the lack of sufficiently stable and efficient chiroptical systems. To this end, the development of suitable chiroptical structures is esse...

Chiral macrocycles offer great potential and versatility regarding their applications: asymmetric catalysts, chiral sensors, chiral supramolecular frameworks, attracting increasing research interest the last decades. Despite all the work developed in this area, most of the reported chiral macrocycles are not conformationally stable and present weak...

Chiroptically active allenes are employed for the construction of surface-confined nanostructures. Morphological complementarity between the homochiral units leads to self-assembly of highly ordered, upstanding architectures in two diastereomers. The novel, intertwined self-assembled monolayers feature reactive terminal alkynes for further function...

The design and synthesis of chiral cyclophanes containing signaling functional groups as an integral part of the macrocyclic framework offer promising possibilities for chiral sensing, molecular recognition, and chiral supramolecular architectures. Our research group has been involved in the construction and study of chiroptical properties of sever...

A chiral bidentate inclusion complex has been formed by halogen-bond interaction between the pyridyl moieties of a pyridoallenoacetylenic host and octafluorodiiodobutane. X-ray crystallography showed that the guest adopts a chiral conformation inside the molecular channels formed by stacking of the host units. A 10 ppm shielding of the (15)N NMR re...