Academic literature on the topic 'Non-conjugated bonds'

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Journal articles on the topic "Non-conjugated bonds"

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Peña-Álvarez, Miriam, Samuele Fanetti, Naomi Falsini, et al. "Linear, Non-Conjugated Cyclic and Conjugated Cyclic Paraphenylene under Pressure." Molecules 24, no. 19 (2019): 3496. http://dx.doi.org/10.3390/molecules24193496.

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The n-paraphenylene family comprises chains of phenylene units linked together by C-C bonds that are between single- and double-bonded, and where n corresponds to the number of phenylene units. In this work, we compare the response of the optical properties of different phenylene arrangements. We study linear chains (LPP), cyclic systems (CPPs), and non-conjugated cyclic systems with two hydrogenated phenylenes (H4[n]CPP). Particularly, the systems of interest in this work are [6]LPP, [12]- and [6]CPP and H4[6]CPP. This work combines Raman and infrared spectroscopies with absorption and fluore
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Plichta, Zdeněk, Yulia Kozak, Rostyslav Panchuk та ін. "Cytotoxicity of doxorubicin-conjugated poly[N-(2-hydroxypropyl)methacrylamide]-modified γ-Fe2O3 nanoparticles towards human tumor cells". Beilstein Journal of Nanotechnology 9 (25 вересня 2018): 2533–45. http://dx.doi.org/10.3762/bjnano.9.236.

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Doxorubicin-conjugated magnetic nanoparticles containing hydrolyzable hydrazone bonds were developed using a non-toxic poly[N-(2-hydroxypropyl)methacrylamide] (PHPMA) coating, which ensured good colloidal stability in aqueous media and limited internalization by the cells, however, enabled adhesion to the cell surface. While the neat PHPMA-coated particles proved to be non-toxic, doxorubicin-conjugated particles exhibited enhanced cytotoxicity in both drug-sensitive and drug-resistant tumor cells compared to free doxorubicin. The newly developed doxorubicin-conjugated PHPMA-coated magnetic par
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Bai, Lubing, Yamin Han, Chen Sun, et al. "Unveiling the Effects of Interchain Hydrogen Bonds on Solution Gelation and Mechanical Properties of Diarylfluorene-Based Semiconductor Polymers." Research 2020 (September 30, 2020): 1–15. http://dx.doi.org/10.34133/2020/3405826.

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The intrinsically rigid and limited strain of most conjugated polymers has encouraged us to optimize the extensible properties of conjugated polymers. Herein, learning from the hydrogen bonds in glucose, which were facilitated to the toughness enhancement of cellulose, we introduced interchain hydrogen bonds to polydiarylfluorene by amide-containing side chains. Through tuning the copolymerization ratio, we systematically investigated their influence on the hierarchical condensed structures, rheology behavior, tensile performances, and optoelectronic properties of conjugated polymers. Compared
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Oyman, Z. O., W. Ming, and R. van der Linde. "Oxidation of drying oils containing non-conjugated and conjugated double bonds catalyzed by a cobalt catalyst." Progress in Organic Coatings 54, no. 3 (2005): 198–204. http://dx.doi.org/10.1016/j.porgcoat.2005.06.004.

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Wei, Xing Chuan, Zhi Li Liu, Kun Zhang, Zhi Yun Du, and Xi Zheng. "Systhesis, Characterization and Spectroscopic Properties of (2E,6E)-2,6-Bis(2,3,4-tri-methoxy-benzylidene)cyclohexanone." Advanced Materials Research 396-398 (November 2011): 2338–41. http://dx.doi.org/10.4028/www.scientific.net/amr.396-398.2338.

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In this paper, (2E,6E)-2,6-Bis(2,3,4-tri-methoxy -benzylidene)cyclohexanone (omitted as tmbcho) (1) was obtained by the reaction of acetic acid, tetrahydrofuran, cyclohexanone and 2,3,4-tri-methoxy-benzaldehyde. Three non-classic hydrogen bonds were observed in the compound. X-ray crystallography shows that the crystal structure is stabilized by intermolecular C-H•••π interactions and it contains plenty of conjugated double bonds. The title compound was characterized by UV-vis and fluorescent spectral studies.
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Blay, Gonzalo, José Pedro, and Amparo Sanz-Marco. "Conjugate Alkynylation of Electrophilic Double Bonds. From Regioselectivity to Enantioselectivity." Synthesis 50, no. 17 (2018): 3281–306. http://dx.doi.org/10.1055/s-0037-1610182.

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This review surveys the historical efforts addressed toward the development of the conjugate alkynylation reaction. The regio- and enantioselective conjugate alkynylation of electron-deficient double bonds, most commonly unsaturated carbonyl compounds, has been an elusive reaction for a long time. Intensive research during the last decades has resulted in the identification of a number of effective reagents and catalysts to perform this reaction. Non-stereoselective conjugate alkynylation of unsaturated carbonyl compounds was first achieved by using preformed alkynyl organometallics and later
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Xuqing, Liu, Li Yayun, Liu Chao, et al. "Identification of residual non-biodegradable organic compounds in wastewater effluent after two-stage biochemical treatment." Open Life Sciences 11, no. 1 (2016): 396–401. http://dx.doi.org/10.1515/biol-2016-0053.

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AbstractThe main non-biodegradable compounds (soluble microbial product – SMP) of wastewater from the Maotai aromatic factories, located in the Chishui river region, were analyzed by UV spectroscopy, and by solid-phase extraction followed by gas chromatography coupled to mass spectrometry, after a two-stage biochemical treatment. The UV-Vis spectra revealed that the wastewater contained two double-bonds in conjugated systems (conjugated diene or α, β- unsaturated ketone, etc.) and simple non-conjugated chromophores containing n electrons from carbonyl groups or the like. The residual organic n
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Janjua, Muhammad Ramzan Saeed Ashraf, Zain Hassan Yamani, Saba Jamil, et al. "First Principle Study of Electronic and Non-Linear Optical (NLO) Properties of Triphenylamine Dyes: Interactive Design Computation of New NLO Compounds." Australian Journal of Chemistry 69, no. 4 (2016): 467. http://dx.doi.org/10.1071/ch15402.

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In this study, density functional theory and time-dependent density functional theory are used to determine how the size of π-conjugated system influences the absorption spectra and non-linear optical (NLO) properties of dyes. Double and triple bonds, as well the benzene rings, are used in conjugated systems. The results of the theoretical computation show that the absorption spectra are gradually broadened and red-shifted with increases in the conjugation length. Theoretical examination of the NLO properties was performed on the key parameters of polarizability and hyperpolarizability. A nota
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Gutman, Ivan. "Kekulé Structures in Fluoranthenes." Zeitschrift für Naturforschung A 65, no. 5 (2010): 473–76. http://dx.doi.org/10.1515/zna-2010-0513.

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Fluoranthenes are polycyclic conjugated molecules consisting of two benzenoid fragments, connected by two carbon-carbon bonds so as to form a five-membered ring. Fluoranthenes possessing Kekul´e structures are classified into three types, depending on the nature of the two carbon-carbon bonds connecting the two benzenoid fragments. Either both these bonds are essentially single (i. e., single in all Kekul´e structures), or both are essentially double (i. e., double in all Kekul´e structures), or one is essentially single and the other is essentially double. All Kekul´ean fluoranthenes have equ
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Mendoza, Juan Manuel Martínez, Lena Ruíz Ramírez, Ruben Alfredo Toscano, et al. "Cross-conjugated Z- and E-3-ferrocenylmethyl-idene-4-methyl-2-phenylpenta-1,4-dienes — Synthesis and some chemical properties." Canadian Journal of Chemistry 85, no. 11 (2007): 969–82. http://dx.doi.org/10.1139/v07-105.

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Dehydration of (Z)- and (E)-4-ferrocenyl-3-isopropenyl-2-phenylbut-3-en-2-ols and Z-3-ferrocenyl methyl idene-4-methyl-2-phenylpentane-2,4-diol affords (Z)- and (E)-3-ferrocenylethylidene-4-methyl-2-phenylpenta-1,4-dienes with a system of three cross-conjugated double bonds. One of the methylidene groups of the trienes obtained is smoothly protonated under the action of tetrafluoroboric acid etherate to yield (Z)- and (E)-3-ferrocenyl-2-isopropenyl-1-methyl-1-phenylallyl tetrafluoroborates. The cross-conjugated trienes undergo cationic cycloaddition to these allylic cations as well as proton-i
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Dissertations / Theses on the topic "Non-conjugated bonds"

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Kushch, S. D., and N. S. Kuyunko. "Fullerene Black: Structure, Properties and Possible Applications." Thesis, Sumy State University, 2012. http://essuir.sumdu.edu.ua/handle/123456789/35050.

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This review concerns the fullerene black, a poorly known nano-sized carbon material, the insoluble recidue after extraction of fullerenes from fullerene soot produced by arc evaporation of carbon material (usually graphite) in a helium atmosphere. This by-product of the production of fullerenes, whose yield reaches 80 wt %, is a finely dispersed material with a particle size of 40–50 nm. It includes amorphous carbon, graphitized particles, and graphite. Test reactions showed the presence in the structure of fullerene black of curved surfaces, and, like fullerenes, of alternating non-conj
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Book chapters on the topic "Non-conjugated bonds"

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Ravi, Monisha, Sanmugapriya Ravi, and Arockia Selvi J. "COMPREHENSIVE VIEW OF ISOLATION/ DETECTION OF PHYTOCHEMICALS FROM PLANT EXTRACT: ECO-FRIENDLY CORROSION INHIBITOR IN VARIOUS CORROSIVE MEDIA." In Futuristic Trends in Chemical Material Sciences & Nano Technology Volume 3 Book 11. Iterative International Publishers, Selfypage Developers Pvt Ltd, 2024. http://dx.doi.org/10.58532/v3becs11p2ch8.

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Plants are a source of chemicals that are now being explored in diverse applications in metal deterioration prevention in most systems as a possible substitute for harmful synthetic inhibitors. Over the previous few decades, natural extracts have been used to prevent metals from corroding. The plant extracts give corrosion inhibition efficiencies above 60%. Complex phytochemicals with electron-rich sites in plant extracts interact aggressively with the metallic surface. Numerous multiple bonds and polar functional groups are typically conjugated with these phytochemicals. The presence of π ele
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Barford, William. "Electron-Lattice Coupling I: Noninteracting Electrons." In Electronic and Optical Properties of Conjugated Polymers. Oxford University PressOxford, 2005. http://dx.doi.org/10.1093/oso/9780198526803.003.0004.

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Abstract Electron-phonon coupling plays a crucial role in one-dimensional systems. For any value of the electron-phonon coupling an infinite, undistorted polymer chain is unstable with respect to a lower symmetry, distorted structure. This is a consequence of the well-known Peierls theorem (Fr¨ohlich 1954; Peierls 1955), which states that a one-dimensional metal is unstable with respect to a lattice distortion that opens a band gap at the Fermi surface. A proof of bond-alternation in conjugated polymers in the non interacting limit was first presented independently by Ooshika (1957, 1959), and
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Tvaroska, I., C. Rochas, F. R.Taravel, and T. Turquois. "Kappa carrageenan-mannan interaction: a theoretical approach." In Gums and stabilisers for the Food industry 6. Oxford University PressOxford, 1992. http://dx.doi.org/10.1093/oso/9780199632848.003.0032.

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Abstract A computer program SAINT has been developed for the investigation of the structure and for the prediction of minimum-energy structure of polysaccharide polysaccharide complexes. The energy minimization is carried out on internal geometrical parameters, namely bond angles, torsional angles and five parameters describing the mutual orientations of polysaccharide chains. For this purpose, the non-derivative method of conjugated directions is used. This procedure was applied to computer modeling of the interactions between models of kappa carrageenan and mannan. It is shown that the inter
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Conference papers on the topic "Non-conjugated bonds"

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Said, Diego, Gabriela Belinato, Rosa L. Simencio Otero, et al. "Effect of the Oxidation Stability of Soybean Oil and Palm Oil on Steel Quenching Performance." In HT 2011, edited by B. Lynn Ferguson, Roger Jones, D. Scott MacKenzie, and Dale Weires. ASM International, 2011. http://dx.doi.org/10.31399/asm.cp.ht2011p0258.

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Abstract The potential use of vegetable oil derived industrial oils continues to be of great interest because vegetable oils are: relatively non-toxic, biodegradable and they are a renewable basestock alternative to petroleum oil. However, the fatty ester components containing conjugated double bonds of the triglyceride structure of vegetable oils typically produces considerably poorer thermal oxidative stability than that achievable with petroleum basestocks under typical use conditions where furnace loads of hot steel (850 °C) are typically rapidly immersed and cooled to approximately 50-60
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Solis-Calero, C., PA Morais, FF Maia Jr, VN Freire, and HF Carvalho. "Explaining SARS-CoV-2 3CL Mpro binding to peptidyl Michael acceptor and a ketone-based inhibitors using Molecular fractionation with conjugate caps method." In VIII Simpósio de Estrutura Eletrônica e Dinâmica Molecular. Universidade de Brasília, 2020. http://dx.doi.org/10.21826/viiiseedmol2020185.

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The main protease SARS-CoV-2 3CL Mpro (3CL-Mpro) is an attractive target for developing antiviral inhibitors due to its essential role in processing the polyproteins translated from viral coronavirus RNA. In this work, it was obtained non-covalent complexes of this protease with two distinct ligands, a peptidyl Michael acceptor (N3) and a ketone-based compound (V2M). The complexes were modeled from processed crystallographic data (PDB id: 6LU7 and 6XHM respectively) using combined quantum mechanics/molecular mechanics (QM/MM) calculations. The QM region was treated at the PBE-def2-SV(P) level,
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Nunzi, Jean-Michel, Charles Hirlimann, and Jean-François Morhange. "Detection of a strongly coupled vibration-mode during the exciton bleaching of polydiacetylene." In International Conference on Ultrafast Phenomena. Optica Publishing Group, 1992. http://dx.doi.org/10.1364/up.1992.mc3.

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Polydiacetylenes have large optical nonlinearities due to the extension of their π-electron wave-functions which are delocalized over many polymer repeat-units. They also exhibit sub-picosecond excited-state relaxation-times due to the efficient non-radiative decay processes which are mediated by the large electron-phonon coupling in those one-dimensional conjugated systems [1]. Some vibration modes such as the single, double and triple carbon-carbon bond-stretching ones, which are strongly coupled to the electronic excited-states, have been characterized using various resonant Raman effects [
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