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Littérature scientifique sur le sujet « Triimidazole »

Auteur : Grafiati

Publié le 9 mars 2023

Mis à jour le 10 mars 2023

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Articles de revues sur le sujet "Triimidazole"

Melnic, Elena, Victor Ch Kravtsov, Elena Lucenti, Elena Cariati, Alessandra Forni, Nikita Siminel et Marina S. Fonari. « Regulation of π⋯π stacking interactions between triimidazole luminophores and comprehensive emission quenching by coordination to Cu(ii) ». New Journal of Chemistry 45, n^o 20 (2021) : 9040–52. http://dx.doi.org/10.1039/d1nj00909e.

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Hei, Ze-Huan, Gan-Lin Song, Chen-Yu Zhao, Wenhao Fan et Mu-Hua Huang. « Supramolecular porous ionic network based on triazinonide and imidazolium : a template-free synthesis of meso-/macroporous organic materials via a one-pot reaction-assembly procedure ». RSC Advances 6, n^o 95 (2016) : 92443–48. http://dx.doi.org/10.1039/c6ra20590a.

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A supramolecular porous ionic network (SPIN-1) was designed and prepared using a one-pot procedure, involving the quaternization of triimidazole triazine with cyanuric chloride followed by hydrolysis andin situassembly.

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Malpicci, Daniele, Clelia Giannini, Elena Lucenti, Alessandra Forni, Daniele Marinotto et Elena Cariati. « Mono-, Di-, Tri-Pyrene Substituted Cyclic Triimidazole : A Family of Highly Emissive and RTP Chromophores ». Photochem 1, n^o 3 (18 novembre 2021) : 477–87. http://dx.doi.org/10.3390/photochem1030031.

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The search of new organic emitters is receiving a strong motivation by the development of ORTP materials. In the present study we report on the preparation, optical and photophysical characterization, by both steady state and time resolved techniques, of two pyrene-functionalized cyclic triimidazole derivatives. Together with the already reported mono-substituted derivative, the di- and tri-substituted members of the family have revealed as intriguing emitters characterized by impressive quantum yields in solution and RTP properties in the solid state. In particular, phosphorescence lifetimes increase from 5.19 to 20.54 and 40.62 ms for mono-, di- and trisubstituted compounds, respectively. Based on spectroscopical results and theoretical DFT/TDDFT calculations on the di-pyrene molecule, differences in photophysical performances of the three compounds have been assigned to intermolecular interactions increasing with the number of pyrene moieties appended to the cyclic triimidazole scaffold.

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Previtali, Andrea, Elena Lucenti, Alessandra Forni, Luca Mauri, Chiara Botta, Clelia Giannini, Daniele Malpicci, Daniele Marinotto, Stefania Righetto et Elena Cariati. « Solid State Room Temperature Dual Phosphorescence from 3-(2-Fluoropyridin-4-yl)triimidazo[1,2-a:1′,2′-c:1″,2″-e][1,3,5]triazine ». Molecules 24, n^o 14 (13 juillet 2019) : 2552. http://dx.doi.org/10.3390/molecules24142552.

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Organic room temperature persistent luminescence is a fascinating but still largely unexplored phenomenon. Cyclic-triimidazole and its halogenated (Br, I) derivatives have recently revealed as intriguing phosphors characterized by multifaceted emissive behavior including room temperature ultralong phosphorescence (RTUP) associated with the presence of H-aggregates in their crystal structure. Here, we move towards a multicomponent system by incorporating a fluoropyridinic fragment on the cyclic-triimidazole scaffold. Such chromophore enhances the molecular properties resulting in a high photoluminescence quantum yield (PL QY) in solution but preserves the solid-state RTUP. By means of X-ray diffraction (XRD) analysis, theoretical calculations, steady-state and time-resolved spectroscopy on solutions, polymethylmethacrylate (PMMA) blends and crystals, the nature of the different radiative deactivation channels of the compound has been disclosed. In particular, the molecular fluorescence and phosphorescence, this latter observed in frozen solution and in PMMA blends, are associated to deactivation from S1 and T1 respectively, while the low energy RTUP, observed only for crystals, is interpreted as originated from H aggregates.

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Schubert, David M., Daniel T. Natan, Duane C. Wilson et Kenneth I. Hardcastle. « Facile Synthesis and Structures of Cyclic Triimidazole and Its Boric Acid Adduct ». Crystal Growth & ; Design 11, n^o 3 (2 mars 2011) : 843–50. http://dx.doi.org/10.1021/cg101489t.

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Melnic, Elena, Victor Kravtsov, Elena Lucenti, Elena Cariati, Alessandra Forni et Marina Fonari. « Structural landscape of CuII coordination compounds with isomers and derivatives of cyclic triimidazole ». Acta Crystallographica Section A Foundations and Advances 75, a2 (18 août 2019) : e502-e502. http://dx.doi.org/10.1107/s2053273319090545.

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Malpicci, Daniele, Alessandra Forni, Elena Cariati, Riku Inoguchi, Daniele Marinotto, Daniele Maver, Federico Turco et Elena Lucenti. « Crystallization-Enhanced Emission and Room-Temperature Phosphorescence of Cyclic Triimidazole-Monohexyl Thiophene Derivatives ». Molecules 28, n^o 1 (24 décembre 2022) : 140. http://dx.doi.org/10.3390/molecules28010140.

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The development of organic room-temperature phosphorescent (ORTP) materials represents an active field of research due to their significant advantages with respect to their organometallic counterparts. Two cyclic triimidazole (TT) derivatives bearing one and three hexyl-thiophene moieties, TT-HThio and TT-(HThio)3, have been prepared and characterized. Both compounds display enhanced quantum yields in their crystalline form with respect to those in a solution state, revealing crystallization-enhanced emissive (CEE) behavior. Importantly, while single fluorescence is observed in solution, crystalline powders also feature dual ORTP, whose respective molecular and aggregate origins have been disclosed through X-ray diffraction analysis and DFT/TDDFT calculations. The relation between the photophysical properties of TT-HThio and its crystallinity degree has been confirmed by a decrease in photoluminescent quantum yield (Φ) and loss of vibronic resolution when its crystals are ground in a mortar, revealing mechanochromic behavior and confirming CEE features.

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Lucenti, Elena, Alessandra Forni, Chiara Botta, Clelia Giannini, Daniele Malpicci, Daniele Marinotto, Andrea Previtali, Stefania Righetto et Elena Cariati. « Intrinsic and Extrinsic Heavy‐Atom Effects on the Multifaceted Emissive Behavior of Cyclic Triimidazole ». Chemistry – A European Journal 25, n^o 10 (21 janvier 2019) : 2452–56. http://dx.doi.org/10.1002/chem.201804980.

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Lucenti, Elena, Alessandra Forni, Chiara Botta, Lucia Carlucci, Clelia Giannini, Daniele Marinotto, Alessandro Pavanello, Andrea Previtali, Stefania Righetto et Elena Cariati. « Cyclic Triimidazole Derivatives : Intriguing Examples of Multiple Emissions and Ultralong Phosphorescence at Room Temperature ». Angewandte Chemie International Edition 56, n^o 51 (30 novembre 2017) : 16302–7. http://dx.doi.org/10.1002/anie.201710279.

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Lucenti, Elena, Alessandra Forni, Chiara Botta, Lucia Carlucci, Clelia Giannini, Daniele Marinotto, Alessandro Pavanello, Andrea Previtali, Stefania Righetto et Elena Cariati. « Cyclic Triimidazole Derivatives : Intriguing Examples of Multiple Emissions and Ultralong Phosphorescence at Room Temperature ». Angewandte Chemie 129, n^o 51 (30 novembre 2017) : 16520–25. http://dx.doi.org/10.1002/ange.201710279.

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Thèses sur le sujet "Triimidazole"

PREVITALI, ANDREA. « NEW ORGANIC AND HYBRID ORGANIC/INORGANIC MATERIALS WITH INTRIGUING SOLID STATE OPTOELECTRONIC PROPERTIES ». Doctoral thesis, Università degli Studi di Milano, 2021. http://hdl.handle.net/2434/847595.

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In the last decades the development of new technologies is requiring new materials with enhanced emissive properties in the solid state to be applied in different fields spanning from OLED to biological applications. Research in this context is historically limited by the observation that luminogens possess better properties in dispersed system than in the condensed phase due to the well-known Aggregation Caused Quencing (ACQ) phenomenon. However, in 2001 Tang and co-workers reported some pioneering works on luminogens displaying opposite properties, being highly emissive in the condensed phase but not in diluted solution, a behaviour named Aggregation Induced Emission (AIE) [1]. Different mechanisms may explain the AIE phenomenon, the most frequent one being the inhibition of molecular motions (vibrations and rotations) which works as nonradiative deactivation channels for the molecule but are somehow locked in the aggregated state. In parallel, strong efforts have been devoted to the search of organic molecules with long-lived excited states that enable exciton migration over long distances for increased production of free charges. Usually, transitions from singlet (short-lived) to triplet (long-lived) states are facilitated by the presence of metals or specific organic moieties (i.e. aromatic aldehyde, heavy halogen atoms, heteroatoms with lone pairs). In addition, since triplet excitons generated in organic molecules are highly sensitive to oxygen and temperature, stringent conditions are required to observe long-lived phosphorescence from pure organic molecules. However, very recently, An et al. reported ultralong phosphorescent emission features in structures of planar organic molecules coupled in H-aggregates, which provide an effective means of stabilizing and protecting triplet excitons formed through intersystem crossing (ISC) [2]. The stabilized excited state, which functions as an energy trap at a lower energy level, may delocalize on several neighbouring molecules, offering suppressed radiative and nonradiative deactivation decay rates in favour of long-lived excited states and room temperature ultralong phosphorescence (RTUP). In this regard, during my research work, I have been involved in the synthesis and characterization of triimidazo[1,2-a:1',2'-c:1'',2''-e][1,3,5]triazine (TT or cyclic triimidazole) and of its derivatives. In fact, TT is an intriguing solid state luminogen characterized by AIE and RTUP properties. Diluted solutions of TT in DCM display weak emission (Ф = 2%) even under inert atmosphere, while crystalline powders (Ф = 30%) show an intense fluorescent emission at 425 nm and an ultralong emission at 520 nm with decay time close to 1 s. This behaviour, in agreement with works by An et al. [2] arises from the formation of H-aggregates in the crystal structure of the compound as revealed by XRD studies [3]. The main goal of my project has been the synthesis and characterization of organic and hybrid inorganicorganic 1. Luo, J.; Xie, Z.; Lam, J. W. Y.; Cheng, L.; Chen, H.; Qiu, C.; Kwok, H. S.; Zhan, X.; Liu, Y.; Zhu, D.; Tang, B. Z., Aggregation-induced emission of 1-methyl-1,2,3,4,5-pentaphenylsilole. Chemical Communications 2001, (18), 1740-1741. 2. An, Z.; Zheng, C.; Tao, Y.; Chen, R.; Shi, H.; Chen, T.; Wang, Z.; Li, H.; Deng, R.; Liu, X.; Huang, W., Stabilizing triplet excited states for ultralong organic phosphorescence. Nature Materials 2015, 14 (7), 685-690. 3. Lucenti, E.; Forni, A.; Botta, C.; Carlucci, L.; Giannini, C.; Marinotto, D.; Previtali, A.; Righetto, S.; Cariati, E., H-Aggregates Granting Crystallization-Induced Emissive Behavior and Ultralong Phosphorescence from a Pure Organic Molecule. The Journal of Physical Chemistry Letters 2017, 8 (8), 1894-1898.

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Chapitres de livres sur le sujet "Triimidazole"

« Triimidazo[1,2-a:1',2'-c:1",2"-e][1,3,5]triazine (15) to [9,10]Benzo-11-oxatricyclo[6.2.1.02,6]undeca-3,5,9-triene (15) ». Dans Substance Index Cyclic Compounds VIII, Polycyclic Compounds I, sous la direction de Backes, Fröhlich et Padeken. Stuttgart : Georg Thieme Verlag, 2001. http://dx.doi.org/10.1055/b-0035-114395.

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