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Littérature scientifique sur le sujet « Cycloparaphenylenes »

Auteur : Grafiati

Publié le 10 mars 2023

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Articles de revues sur le sujet "Cycloparaphenylenes"

D'Auria, Maurizio. « The Use of D Index in the Estimation of Aromaticity : The Case of Cycloparaphenylene ». Letters in Organic Chemistry 16, n^o 2 (9 janvier 2019) : 134–38. http://dx.doi.org/10.2174/1570178615666180830113618.

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Cycloparaphenylenes are important compounds for their photophysical and electronic properties. The curved structure of these compounds induces an alteration of the aromatic character of these compounds. D values have been used to describe the aromatic character of compounds from [5]- to [10]cycloparaphenylene. D values are compared with HOMED and with the strain energy are obtained by using an homodesmotic reaction.

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Lewis, Simon E. « Cycloparaphenylenes and related nanohoops ». Chemical Society Reviews 44, n^o 8 (2015) : 2221–304. http://dx.doi.org/10.1039/c4cs00366g.

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Cyclic oligo-para-phenylenes (“CPPs”) possessing radial π systems have markedly different properties to the analogous linear oligo-para-phenylenes. Their synthesis is challenging due to the strain inherent in their structures, but several distinct strategies to access them have now been described. This review describes the synthesis, properties and applications of CPPs and related variants.

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Oldani, N., S. K. Doorn, S. Tretiak et S. Fernandez-Alberti. « Photoinduced dynamics in cycloparaphenylenes : planarization, electron–phonon coupling, localization and intra-ring migration of the electronic excitation ». Physical Chemistry Chemical Physics 19, n^o 45 (2017) : 30914–24. http://dx.doi.org/10.1039/c7cp06426h.

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Alvarez, Miriam Peña, M. Carmen Ruiz Delgado, Mercedes Taravillo, Valentín G. Baonza, Juan T. López Navarrete, Paul Evans, Ramesh Jasti, Shigeru Yamago, Miklos Kertesz et Juan Casado. « The Raman fingerprint of cyclic conjugation : the case of the stabilization of cations and dications in cycloparaphenylenes ». Chem. Sci. 7, n^o 6 (2016) : 3494–99. http://dx.doi.org/10.1039/c6sc00765a.

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Sisto, Thomas J., Lev N. Zakharov, Brittany M. White et Ramesh Jasti. « Towards pi-extended cycloparaphenylenes as seeds for CNT growth : investigating strain relieving ring-openings and rearrangements ». Chemical Science 7, n^o 6 (2016) : 3681–88. http://dx.doi.org/10.1039/c5sc04218f.

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Fujitsuka, Mamoru, Eiichi Kayahara, Chao Lu, Shigeru Yamago et Tetsuro Majima. « Significant structural relaxations of excited [n]cycloparaphenylene dications (n = 5–9) ». Physical Chemistry Chemical Physics 20, n^o 46 (2018) : 29207–11. http://dx.doi.org/10.1039/c8cp04860f.

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Dang, Jing-Shuang, Wei-Wei Wang, Xiang Zhao et Shigeru Nagase. « A mechanistic study on cationic Li prompted Diels–Alder cycloaddition of cycloparaphenylene ». Organic Chemistry Frontiers 4, n^o 9 (2017) : 1757–61. http://dx.doi.org/10.1039/c7qo00290d.

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Griwatz, Jan H., et Hermann A. Wegner. « One-Pot Synthesis of Cycloparaphenylenes ». Organic Materials 02, n^o 04 (octobre 2020) : 306–12. http://dx.doi.org/10.1055/s-0040-1721082.

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The preparation of cycloparaphenylenes ([n]CPPs) with their bent π-system poses a long-standing challenge in organic synthesis. In the current multi-step approaches to access CPPs, pre-angulated precursors were combined using transition metal-catalysed or mediated coupling reactions. Therefore, there is a long way to the realisation of the idea of an ‘ideal synthesis’. An easy and efficient synthesis of different [n]CPPs would represent a breakthrough, also pushing their incorporation into organic materials. By combining multiple steps in a one-pot approach, the overall time and workload can be drastically shortened. Herein, we present the application of this concept for the preparation of [6] and [9]CPP as a simple and fast alternative to current methods. By tuning the reaction conditions the selective synthesis of both [6] and [9]CPP was demonstrated.

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Wassy, Daniel, Mathias Hermann, Jan S. Wössner, Lucas Frédéric, Grégory Pieters et Birgit Esser. « Enantiopure nanohoops through racemic resolution of diketo[n]CPPs by chiral derivatization as precursors to DBP[n]CPPs ». Chemical Science 12, n^o 30 (2021) : 10150–58. http://dx.doi.org/10.1039/d1sc02718b.

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Jiang, Yuhang, Edoardo Jun Mattioli, Matteo Calvaresi et Zhiyong Wang. « Theoretical design of an ultrafast supramolecular rotor composed of carbon nano-rings ». Chemical Communications 56, n^o 79 (2020) : 11835–38. http://dx.doi.org/10.1039/d0cc04806b.

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Thèses sur le sujet "Cycloparaphenylenes"

Evans, Paul. « Synthesis of Small, Chiral, and Photoswitchable Cycloparaphenylenes ». Thesis, University of Oregon, 2015. http://hdl.handle.net/1794/19282.

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Cycloparaphenylenes (CPPs) represent the unit-cycles of conductive armchair carbon nanotubes (CNTs). In addition to their utility for the bottom-up synthesis of CNTs with discrete diameter and chirality, these strained hydrocarbon macrocycles have attractive properties of their own for material science and organic electronics. Herein I report research focused on advancing the synthetic technology behind CPPs, culminating in the synthesis of [5]CPP, the smallest and most highly-strained member of the CPP series to date, as well as the derivitization of the CPP platform to include chiral nanohoops with a spiral carbon backbone and photoswitchable nanohoops based on azobenzene incorporation into the CPP architecture. The synthesis and characterization of [5]CPP, 1,5-naphthyl[6]CPP, azo[11]CPP, and azo[9]CPP are reported along with advanced intermediates towards rotationally restricted 2,6-naphthyl[6]CPP and preliminary photoisomerization results for azo[11]CPP and azo[9]CPP. This dissertation contains both previously published and unpublished co-authored material.

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Iwamoto, Takahiro. « Studies on Synthesis and Host-Guest Chemistry of Cycloparaphenylenes ». 京都大学 (Kyoto University), 2014. http://hdl.handle.net/2433/188613.

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White, Brittany. « The Synthesis of Functionalized Cycloparaphenylenes as Novel Biocompatible Fluorescent Probes and Organic Materials ». Thesis, University of Oregon, 2019. http://hdl.handle.net/1794/24521.

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Conjugated macrocycles have emerged as novel structural motifs that modulate the electronic properties of organic molecules because of their strained and contorted structures. Cycloparaphenylenes, known as nanohoops, are a particularly attractive scaffold for the design of new types of carbon nanomaterials because of their size-selective synthesis, radially oriented π-systems and tunable electronic properties. The development of modular syntheses of nanohoops over the past decade should enable the preparation of substituted derivatives that can be tuned for applications in biology and materials science. Chapter I provides a brief overview of conjugated macrocycles recently reported in the literature with a discussion of the structural effects that are responsible for the remarkable properties of this class of molecules. Chapter II highlights a scalable and mild synthetic approach developed in our lab to prepare nanohoop conjugated macrocycles and expands the generality of this methodology with the formal synthesis of natural product Acerogenin E. Chapter III describes the synthesis of cycloparaphenylenes with versatile functional handles and uncovers the reactivity of the strain nanohoop backbone under reaction conditions that promote the formation of radical cations. Chapter IV takes advantage of the functional groups described in chapter III to develop the first example of nanohoops as a new class of biocompatible fluorophores. Chapter V details a novel synthetic approach that enables the incorporation of the linear acene pentacene into the nanohoop backbone and reports our findings on the impact that the macrocyclic structure has on the properties of this organic semiconductor. In summary, the findings discussed in this dissertation provide synthetic strategies for the selective functionalization of nanohoops and highlight this class of molecules as a novel scaffold for the design of new types of carbon nanomaterials. This dissertation includes previously published and unpublished co-authored material.

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Sun, Liansheng. « Studies on the Syntheses and Properties of Cycloparaphenylenes Having Heteroatom Functionalities and New Topology ». Kyoto University, 2020. http://hdl.handle.net/2433/253506.

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Della, Sala Paolo. « Synthesis and properties of new macrocyclic derivates ». Doctoral thesis, Universita degli studi di Salerno, 2019. http://elea.unisa.it:8080/xmlui/handle/10556/4255.

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2017 - 2018
This PhD thesis is concerned with the design, synthesis and the characterization of new macrocyclic derivatives. Development of new macrocyclic compounds is a particularly interesting because they can involve like building block in Supramolecular chemistry and Nanochemistry. In the first place, I studied the supramolecular properties of different derivatives of the resorcin[6]arenes. Crystal of Resorcin[6]arene was obtained and it reveals that in the solid state the resorcin[6]arene assembles in a twin molecular capsule able to host toluene and ethyl acetate solvent molecules. Subsequently, I have reported the first example of resorcin[6]arene-based cavitand. Sulfate bridges play a double role, both, as structural element for the preorganization of the larger resorcin[6]arene macrocycle and as functional supramolecular interacting groups. Finally, I develop a new multivalent systems resorcin[n]arene based for inhibition of glycosidases and mannosidase that are involved in the malignant transformation of cells. These derivatives were synthetized starting to a pyrrolidine-based iminosugar and resorcinarenes compounds through CuAAS cycloaddition. Biological essays showed that all the resorcinarene derivatives have a good inhibitory activity towards mannosidase enzymes. In second instance, I synthetized new Cycloparaphenylenes (CPP) derivatives to molecular recognition and optoelectronic application. Particularly about molecular recognition field, I reported the synthesis of a [8]CPP derivative incorporating an electron-rich 1,4-dimethoxybenzene ring. This is the first example of substituted CPP derivative reported in literature able to recognize pyridinium guests. Owing to the presence of the 1,4-dimethoxybenzene ring a fine-tuning of the binding abilities toward pyridinium guests was obtained with respect to the native [8]CPP macrocycle. Hybrid Calixarene-CPP derivative that combine the supramolecular features of both the hosts was synthetized and studied in molecular recognition of Na+, Li+ and K+. This derivative shows a noncommon Li+ selectivity due to a more favorable interaction between the cation and the aromatic rings of the CPP bridge. Synthesis of incorporate the 9,10-diphenyl anthracene - [8]CPP derivative was performed and were studied optical and electronical features to obtain the first example of a CPP-based emitter in photon upconversion in the presence of the of octaethylporphyrin Pd(II) complex as a sensitizer, thus widening the application fields of this class of compounds. Finally, [8]CPP and [10]CPP was tested to produce Luminescent Solar Concentrators (LSCs). The high Stokes shift of the CPP macrocycles, enables the preparation of slabs in which a low reabsorption was observed. The results here obtained show clearly the photophysical performances of the CPPbased LSC closely matches with that of the lanthanide chelates based LSC, of interest for applications in colorless LSC. [edited by Author]
XXXI ciclo

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Quernheim, Martin [Verfasser]. « From polyarylated cycloparaphenylenes to carbon nanotube segments and metallo N 4-macrocycles as fuel cell catalysts / Martin Quernheim ». Mainz : Universitätsbibliothek Mainz, 2015. http://d-nb.info/1071434225/34.

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Hirst, Elizabeth S. « Synthesis of nitrogen-substituted cycloparaphenylenes ». Thesis, 2014. https://hdl.handle.net/2144/15261.

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Bottom-up synthesis is increasingly becoming the method of choice for assembling and studying novel nanomaterials. Whereas more traditional top-down methods may lead to mixtures of products and suffer from reproducibility issues, bottom-up approaches offer atomistic control over the material's structure. Bottom-up synthesis can also produce materials that would otherwise be unobtainable with top-down methodologies. Finite substructures of carbon nanotubes (CNTs) are one such example. The work encompassed in this thesis details the study of two related classes of CNT substructures: the cycloparaphenylenes (CPPs) and [5.7]ncyclacenes. Cycloparaphenylenes are a class of graphitic material with many unique properties that make them intriguing candidates for study in a variety of electronic applications. Chapter 1 describes the current state of CPP research, from preliminary synthesis to fundamental understanding of their properties. To optimize device performance, carbon materials are often doped with heteroatoms. Towards this end, the synthesis of a series of nitrogen-doped [8]CPPs (N-[8]CPPs) are detailed in Chapter 2. Nitrogen is incorporated into the CPP structure by way of the reductive aromatization strategy used for the all carbon CPPs, replacing 1,4-dibromobenzene with 2,5-dibromopyridine. The synthesis utilizes oxidatively masked benzenes to assemble less strained, macrocyclic precursors. Through the divergent nature of the synthesis, macrocycles containing up to three nitrogen atoms at precise locations are prepared. Macrocycles are aromatized via a single electron reduction to reveal the final N-CPP structures. Chapter 3 details the full characterization of the properties of the novel N-[8]CPPs. The differences between the N-[8]CPPs and [8]CPP are rationalized in the context of DFT studies. Finally, the study of 1N-[8]CPP and [8]CPP as novel electrode materials in supercapacitor cells is presented. Preliminary results show that the CPP electrodes are more conductive than the activated carbon control group, but the specific capacitances are found to be low. Finally, Chapter 4 describes the computational study of a novel family of macrocycle: [5.7]ncyclacenes. [5.7]ncyclacenes are isomers of the sought after [n]cyclacenes. Unlike their isomeric cousins, DFT studies show that [5.7]ncyclacenes have stable, closed-shell singlet ground states with relatively low strain energies. NICS values also show the molecules to be non-aromatic. These results suggest that with proper synthetic design, the [5.7]ncyclacenes should be accessible synthetically.

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Cheng, Wei-Jen, et 鄭惟仁. « Quantum States and Persistent Spin Current in [8]-Cycloparaphenylene-like Structures with Adsorbates ». Thesis, 2018. http://ndltd.ncl.edu.tw/handle/m8678w.

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碩士
國立交通大學
電子物理系所
107
An adatom or an adsorbate located at the center of a benzene ring give rise to spin-orbit interaction to electrons in the ring. The recent synthesis of [n]Cycloparaphenylenes structure, which are chaining up of n-Benzene rings and connecting head to tail to form a larger ring structure, are of interest from the physics perspective. It is because of the structure’s equivalence to an ultra-short carbon nanotube. On the one hand, with the adsorbate-induced spin-orbit interaction, a bulk graphene becomes a Z2 topological material [1] such that helical edge states are expected at the 2 ends of the nanotubes formed from such a material. On the other hand, an ultra-short nanotube will cause the two helical edge states to mix with each other. So the question would be what spin-related physics will survive in such [n]-CPPs-like structures. In this work we consider the simplest case of one adatom on a [8]-CPP-like structure. Depending on the filling of electrons in the system, we find cases of non-zero persistent spin current, while the persistent charge current remains zero.

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Chen, Hang. « Carbon nanotubes and nanohoops : probing the vibrational properties and electron-phonon coupling using Raman spectroscopy ». Thesis, 2015. https://hdl.handle.net/2144/15200.

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For the past three decades, newly discovered carbon nanostructures such as fullerenes, graphene and carbon nanotubes (CNTs) have revolutionized the field of nanoscience, introducing many practical and potential applications pertaining to their exceptional structural, mechanical, thermal, and optoelectronic properties. Raman spectroscopy has been an instrumental technique for characterizing these materials due to its non-destructive nature and high sensitivity to the material responses. While Raman spectroscopy is broadly used for identifying specific material types and quality, it has also been increasingly useful as a tool for probing the electronic and excitonic properties, as well as their interplay with the vibrational properties in the aforementioned carbon nanomaterials. In this dissertation, we present our Raman-related research on carbon nanotubes and a new member of the nano-carbon family - carbon nanohoops (cycloparaphenylenes, or CPPs). We discuss our new findings on the resonance Raman spectroscopy (RRS) of various semiconducting CNTs, with the focus on the Raman excitation profiles (REPs) for the G-band. The asymmetric lineshapes observed in the G-band REPs for the second excitonic (E22) transition of these CNTs contradict a long-held approximation, the Franck-Condon principle, for the vibronic properties of the carbon nanotubes. In addition, the G-band REPs from the closely spaced E33 and E44 transitions are investigated, and we demonstrate that these excitonic levels exhibit significant quantum interference effects between each other. We also present the first comprehensive study of Raman spectroscopy of CPPs. Analogously to CNTs, we show that Raman spectroscopy can be used to identify CPPs of different sizes. A plethora of Raman modes are observed in these spectra, including modes that are comparable to those of CNTs, such as the G-band, as well as Raman peaks that are unique for CPPs. Calculated Raman spectra using density functional theory (DFT) are compared with the experimental results for the assignment of different modes. Furthermore, we refine our knowledge of the CPP Raman modes by concentrating on the even-numbered CPPs. By taking advantage of the symmetry arguments in the even [n]CPPs, we are able to utilize group theory and accurately identify the size dependences of different Raman-active modes.

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Chapitres de livres sur le sujet "Cycloparaphenylenes"

Yamago, Shigeru, Eiichi Kayahara et Sigma Hashimoto. « Cycloparaphenylenes and Carbon Nanorings ». Dans Polycyclic Arenes and Heteroarenes, 143–62. Weinheim, Germany : Wiley-VCH Verlag GmbH & Co. KGaA, 2015. http://dx.doi.org/10.1002/9783527689545.ch6.

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Tian, Xia, et Ramesh Jasti. « Cycloparaphenylenes : The Shortest Possible Segments of Armchair Carbon Nanotubes ». Dans Fragments of Fullerenes and Carbon Nanotubes, 291–309. Hoboken, NJ, USA : John Wiley & Sons, Inc., 2011. http://dx.doi.org/10.1002/9781118011263.ch11.

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Segawa, Yasutomo, Akiko Yagi et Kenichiro Itami. « 3. Chemical Synthesis of Cycloparaphenylenes ». Dans Chemistry of Carbon Nanostructures, sous la direction de Klaus Muellen et Xinliang Feng. Berlin, Boston : De Gruyter, 2017. http://dx.doi.org/10.1515/9783110284645-004.

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