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Готові списки джерел за темами / Azo compounds

Добірка наукової літератури з теми "Azo compounds"

Автор: Grafiati

Опубліковано: 4 червня 2021

Оновлено: 2 березня 2023

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Статті в журналах з теми "Azo compounds":

1

Beck, Karin, Harald Burghard, Gabriele Fischer, Siegfried Hünig, and Petra Reinold. "Azo Cope Rearrangements of Nonstabilized Azo Compounds." Angewandte Chemie International Edition in English 26, no. 7 (July 1987): 672–73. http://dx.doi.org/10.1002/anie.198706721.

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2

Jamain, Zuhair, Melati Khairuddean, and Tay Guan-Seng. "Synthesis of New Star-Shaped Liquid Crystalline Cyclotriphosphazene Derivatives with Fire Retardancy Bearing Amide-Azo and Azo-Azo Linking Units." International Journal of Molecular Sciences 21, no. 12 (June 16, 2020): 4267. http://dx.doi.org/10.3390/ijms21124267.

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Two series of new hexasubstituted cyclotriphosphazene derivatives were successfully synthesized and characterized. These derivatives are differentiated by two types of linking units in the molecules such as amide-azo (6a–j) and azo-azo (8a–j). The homologues of the same series contain different terminal substituents such as heptyl, nonyl, decyl, dodecyl, tetradecyl, hydroxyl, carboxyl, chloro, nitro, and amino groups. All the intermediates and final compounds were characterized using Fourier transform infrared spectroscopy (FT-IR), nuclear magnetic resonance spectroscopy (NMR), and Carbon, Hydrogen, and Nitrogen (CHN) elemental analysis. Liquid crystal properties for all compounds were determined using polarized optical microscope (POM). It was found that only intermediates 2a–e with nitro and alkoxyl terminal chains showed a smectic A phase. All the final compounds with alkoxyl substituents are mesogenic with either smectic A or C phases. However, other intermediates and compounds were found to be non-mesogenic. The study on the fire retardancy of final compounds was determined using limiting oxygen index (LOI) method. The LOI value of pure polyester resin (22.53%) was increased up to 24.71% after treating with 1 wt% of hexachlorocyclotriphosphazene (HCCP). Moreover, all the compounds gave positive results on the LOI values and compound 6i with the nitro terminal substituent showed the highest LOI value of 27.54%.

3

Matsui, Masaki, Shigeo Kawamura, Katusoyoshi Shibata, Hiroshige Muramatsu, Motohiro Mitani, Hideo Sawada, and Masaharu Nakayama. "Perfluoroalkylation of azo compounds." Journal of Fluorine Chemistry 57, no. 1-3 (April 1992): 209–17. http://dx.doi.org/10.1016/s0022-1139(00)82833-x.

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4

Hamidian, Kourosh, Mohsen Irandoust, Ezzat Rafiee, and Mohammad Joshaghani. "Synthesis, Characterization, and Tautomeric Properties of Some Azo-azomethine Compounds." Zeitschrift für Naturforschung B 67, no. 2 (February 1, 2012): 159–64. http://dx.doi.org/10.1515/znb-2012-0208.

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The primary azo compound 1-(3-formyl-4-hydroxyphenylazo)-4-nitrobenzene reacts with some aliphatic and aromatic diamines and yields the corresponding azo-azomethine compounds. These compounds were characterized by elemental analysis, IR, UV/Vis, and NMR spectroscopy. The primary azo compound exists entirely in the azo form in solution as well as in the solid phase. The tautomeric structure of azo-azomethine compounds heavily depends on the solvent and the substituents. Aliphatic diamine-based compounds favor the enol-imine tautomer while aromatic diamine-based compounds have structures that lie between the two enol-imine and keto-amine tautomers due to a relatively strong intramolecular hydrogen bond. The compounds exhibit positive solvatochromism (bathochromic shift) so that their absorption bands move toward longer wavelengths as the polarity of the solvents increases. In addition, UV/Vis spectrophotometry has shown that the studied compounds have molar extinction coefficients larger than 40000.

5

Kempa, S., L. Wallach, and K. Rueck-Braun. "ChemInform Abstract: Aliphatic Azo Compounds." ChemInform 43, no. 36 (August 9, 2012): no. http://dx.doi.org/10.1002/chin.201236234.

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6

Yadav, Pramod Kumar. "Synthesis, Characterization and Antimicrobial Studies of Some Azo-Compounds." Academic Voices: A Multidisciplinary Journal 6 (June 4, 2018): 24–27. http://dx.doi.org/10.3126/av.v6i0.20104.

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Two azo-compounds, azobenzene-4, 4′-dicarboxylic acid 1 and 4-(2-hydroxy-naphthalen-1-ylazo)-benzoic acid 2 were synthesized for study of their antibacterial activity. Structures of the two compounds were confirmed by NMR, IR and elemental analysis. Antibacterial activity of the compounds was tested by disk diffusion method against the bacteria strains Staphylococcus aureus and Escherichia coli. The compound 1 was moderately active while 2 was highly active against all the bacteria species tested.Academic Voices Vol.6 2016: 24-27

7

Luo, Chao, Oleg Borodin, Xiao Ji, Singyuk Hou, Karen J. Gaskell, Xiulin Fan, Ji Chen, et al. "Azo compounds as a family of organic electrode materials for alkali-ion batteries." Proceedings of the National Academy of Sciences 115, no. 9 (February 9, 2018): 2004–9. http://dx.doi.org/10.1073/pnas.1717892115.

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Organic compounds are desirable for sustainable Li-ion batteries (LIBs), but the poor cycle stability and low power density limit their large-scale application. Here we report a family of organic compounds containing azo group (N=N) for reversible lithiation/delithiation. Azobenzene-4,4′-dicarboxylic acid lithium salt (ADALS) with an azo group in the center of the conjugated structure is used as a model azo compound to investigate the electrochemical behaviors and reaction mechanism of azo compounds. In LIBs, ADALS can provide a capacity of 190 mAh g−1 at 0.5 C (corresponding to current density of 95 mA g−1) and still retain 90%, 71%, and 56% of the capacity when the current density is increased to 2 C, 10 C, and 20 C, respectively. Moreover, ADALS retains 89% of initial capacity after 5,000 cycles at 20 C with a slow capacity decay rate of 0.0023% per cycle, representing one of the best performances in all organic compounds. Superior electrochemical behavior of ADALS is also observed in Na-ion batteries, demonstrating that azo compounds are universal electrode materials for alkali-ion batteries. The highly reversible redox chemistry of azo compounds to alkali ions was confirmed by density-functional theory (DFT) calculations. It provides opportunities for developing sustainable batteries.

8

Al-Mudhafar, May M. Jawad, Rana A. Kamoon, and Tagreed N.-A. Omar. "Synthesis, Characterization and Antimicrobial Evaluation of New Azo Compounds Derived from Sulfonamides and Isatin Schiff Base." International Journal of Drug Delivery Technology 10, no. 01 (March 25, 2020): 150–55. http://dx.doi.org/10.25258/ijddt.10.1.26.

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The present study deals with the synthesis of four different azo-azomethine derivatives; this is done by two steps; the first step is diazotization of sulfonamides (sulfanilamide, sulfacetamide, sulfamethoxazole, and sulfadiazine) separately, followed by the second step; the coupling reaction of diazotized compounds with isatin bis-Schiff base named 3-((4-nitrobenzylidene) hydrazono)indolin-2-one. The later one (bis-Schiff base) was synthesized by the reaction of 3-hydrazono-indolin-2-one with p-nitrobenzaldehyde. The chemical structures of newly synthesized compounds were approved on the basis of their FTIR, 1H-NMR, and CHNS elemental analysis data results. The synthesized azo compounds were tested in vitro for their antimicrobial potential using well diffusion method. All the target compounds were clearly inhibited Escherichia coli and Candida albicans, while only compounds 2b and 2c show antibacterial activity against Pseudomonas aeruginosa. The most active compound among the prepared azo compounds against Escherichia coli, Pseudomonas aeruginosa, and Candida albicans is compound 2b.

9

Jabar, Maha A., and Nisreen H. Karam. "Synthesis and characterization of azo liquid crystal compounds based on 5H-Thiazolo [3,4-b][1,3,4]thiadiazole unit." Bionatura 7, no. 2 (May 15, 2022): 1–4. http://dx.doi.org/10.21931/rb/2022.07.02.17.

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A calamitic symmetric liquid crystalline consisting of an azo group containing 5H-Thiazolo[3,4-b][1,3,4]thiadiazole moiety compound[III] was synthesized via sequence reactions starting from reaction terephthaldehyde with mercaptoacetic acid and thiosemicarbazide in the presence of concentrated sulfuric acid to synthesized 5,5'-(1,4-phenylene)bis(5H-thiazolo[4,3-b][1,3,4]thiadiazol-2-amine)[I] then the azo compound [II] synthesized by coupling between diazonium salt of the compound [I] with phenol at(0-4) ̊C., after that the compound [III] was synthesized by the reaction of the compound [II] with methyl bromide in alkaline media. The compounds are characterized by melting points, FTIR and 1HNMR spectroscopy. The mesomorphic behavior was studied by using polarized optical microscopy POM. Keywords. Azo compounds, liquid crystal, mesomorphic properties

10

Ali, Yousaf, Shafida Abd Hamid, and Umer Rashid. "Biomedical Applications of Aromatic Azo Compounds." Mini-Reviews in Medicinal Chemistry 18, no. 18 (October 12, 2018): 1548–58. http://dx.doi.org/10.2174/1389557518666180524113111.

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Дисертації з теми "Azo compounds":

1

Iannarelli, Paul M. "Routes to novel azo compounds." Thesis, University of Edinburgh, 2008. http://hdl.handle.net/1842/3492.

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Routes to novel heterocyclic azo compounds and components of use as potential inkjet dyes were investigated. A new route to fluorenones from biphenyl acid chlorides using FVP (Flash Vacuum Pyrolysis) has been discovered. Fluorenone and 4-methylfluoren-9-one were prepared by FVP of 2-phenylbenzoyl chloride and 2-methylbiphenyl-2-carbonyl chloride respectively. Xanthen-9-one and thioxanthen-9-one were also prepared by FVP from the corresponding acid chlorides. 9-Phenanthrol could also be prepared via the FVP of biphenylacetyl choride and the application of this method to a heterocylic thiophene system afforded naphtho[1,2-b]thiophen-4-ol. Naphtho[2,1-b]thiophen-4-ol and naphtho[1,2-b]furan- 4-ol could be obtained in low yields by the FVP of (2-thiophen-3-ylphenyl)acetic acid methyl ester and (2-furan-2-ylphenyl) acetic acid methyl ester over a tungsten trioxide catalyst. Coupling of these systems with the diazonium salt of Acid Yellow 9 afforded the corresponding azo compounds. New heterocyclic dyes were also prepared from the condensation of heterocyclic hydrazines with 4,9-disulfophenanthrenequinone. Pyridine, pyridazine, phthalazine, isoquinoline and 2-quinoline disulfophenanthrene quinone metallised 2:1 nickel complexed magenta dyes were prepared. Industrial tests by standard methods revealed the pyridazine dye has a particularly impressive balance of light and ozone fastness over similar magenta dyes. The reaction of an arylnitro compound with 2-aminopyridine appeared to be an attractive and high yielding route to 2-(phenylazo)pyridine. However, application of this reaction to substituted and naphthalene systems failed. This afforded byproducts due to nucleophilic substitution of groups such as methoxy and the relatively uncommon nucleophilic substitution of hydrogen with none of the required azo products obtained. Therefore it appeared that the reaction of a nitro and amine was not a robust and versatile route to heterocyclic azo compounds. An alternate route to heterocyclic azo compounds involved the use of the Mills reaction by the condensation o-anisidine, p-chloroaniline, 2-aminophenol, 3- aminophenol, naphthylamine, 8-amnioquinoline and 2-acetylamino-5-aminobenzenesulfonic acid with 2-nitrosopyridine afforded the heterocyclic azo products in moderate to high yields. The Mills reaction does appear to be the favored route to heterocyclic azo compounds. Several factors were identified which affect the process of bisazo coupling of chromotropic acid and products obtained. Reaction at the ipso position of monoPACAs (2-phenylazochromotropic acid) leading to increased yields of the ipso substitution monoPACA by-product as opposed to the expected bisazo coupling position was a major problem. Studies indicated reactivity at the ipso position was greatly reduced by the presence of electron withdrawing groups around the phenyl ring of the monoPACA. Further study indicated reaction at the bisazo coupling position increased with the strength of the diazonium salt used in bisazo coupling. Therefore the electronic nature of the monoPACA starting material and the diazonium salt used in bisazo coupling greatly affected the products obtained. Reaction pH studies also revealed attack at the bisazo coupling position increases with pH and at lower pH (5.0 – 8.0) attack at the ipso position dominated. Reactivity of the monoPACA starting material also increased with pH. The influence of steric effects upon bisazo coupling revealed, in the cases where ortho sulfonic acid groups were present in the monoPACA, a reduction in attack at the ipso position. Hence the reaction appeared to be directed towards the required bisazo coupling position.

2

Newington, Ian M. "Azo-anions in organic synthesis." Thesis, University of Oxford, 1985. http://ora.ox.ac.uk/objects/uuid:690ab891-be13-4582-a029-47974d20adac.

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Novel synthetic applications of ambident azo-anions derived from hindered hydrazones have been investigated. Reaction with electrophiles occurred predominantly at carbon as the N-addition pathway was sterically retarded. Trityl, diphenyl-4-pyridylmethyl (DPP) benzhydryl, and t-butyldiphenylmethyl (BDP) hydrazones of various aldehydes and ketones were prepared in good yields from the corresponding hydrazines and carbonyls in aqueous methanol. The lithium salts derived from trityl and DPP hydrazones, by treatment with methyl lithium at -55°C, reacted with aldehydes and ketones to generate azo-alkoxides. These could be diverted to alcohols,by sequential protonation and spontaneous homolysis (about -20°C) in the presence of ethanethiol, or to alkenes,by treatment with phosphorus trichloride at -78 G followed by azo-homolysis. The reactions enabled efficient reductive cross-coupling of aldehydes and ketones. The mechanism of the alkene forming reaction was investigated. Anions of benzhydryl hydrazones were found to react inefficiently by a G-addition pathway giving mainly N-addition products. Anions of BDP hydrazones conveniently gave excellent yields of azo-alkanes upon treatment with alkyl halides,but no products were obtained on reaction with carbonyl electrophiles. The azo-alkanes could be isolated and purified and acted as key intermediates for several synthetically useful transformations. Homolysis in refluxing benzene with thiophenol gave alkanes in good yields. Phenylselenenyl-, bromo-, and chloro-alkanes,and β-alkylstyrenes were generated when thiol was replaced by diphenyl diselenide, N-bromosuccinimide, N-chlorosuccinimide and β-nitrostyrene respectively. Treatment of the azo-alkanes with trifluoroacetic acid generated benzophenone alkylhydrazones. These were dissolved in ethanol with concentrated hydrochloric acid, thereafter hydrolysis yielded alkylhydrazines or treatment with hydrogen (1 atm., 50°C, 20h) over 10% Pd/C generated primary amines by a novel use of carbonyls as α-aminocarbanion equivalents.

3

MacDonald, Ranald John. "Novel routes to heterocyclic Azo compounds." Thesis, University of Edinburgh, 2011. http://hdl.handle.net/1842/5787.

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The potential use of electron-deficient heterocyclic azo compounds as inkjet dyes was explored. 2-Nitrosopyridine could be used to form a series of azo compounds via the Mills’ reaction with electron-rich aromatic amines. Conditions for this process were optimised by varying solvent and pH. In the presence of ethers, 2-nitrosopyridine is quickly reduced to azoxypyridine. This reaction follows first order kinetics; diethyl and diisopropyl ether react at similar rates, whereas cyclic ethers such as THF are far slower. Organic bases such as Hunigs base were also found to promote formation of azoxypyridine. The mechanism of this reduction was studied. The electrochemistry of 2-nitrosopyridine and azoxypyridine was also explored. Using the optimised conditions for the Mills’ reaction, 2-nitrosopyridine not only reacts with electron-rich amines but also electron-deficient examples. The series was also expanded to include other heterocycles as well as pyridine via the corresponding heterocyclic nitroso compound. Other nitroso compounds prepared were 1- nitrosoisoquinoline, 2-nitrosopyrazine, 4-nitrosopyrimidine and 2-nitrosopyrimidine. The absorption maxima of azo compounds prepared from these precursors were found to correlate with the values for the corresponding azobenzenes. 2-Nitrosopyridine and 2-nitrosopyrimidine react with diamines to give monoazo products. These in turn could be diazotised and coupled with various components to give either bisazo or trisazo compounds. These dyes were tested for their ozone and light fastness properties. The bisazo examples were found to have good ozone fastness but poor light fastness. The pyrimidine examples only showed a slight improvement in ozone and light fastness compared to their pyridine analogue. 2,3-Phthalocyanines are important components in cyan dyes. New routes to precursors of these compounds were explored using flash vacuum pyrolysis (FVP).

4

江鳳思 and Fung-sze Kong. "The chemistry of Osmium carbonyl clusters containing organomercurials and azo-compounds." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1999. http://hub.hku.hk/bib/B31238695.

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5

Kong, Fung-sze. "The chemistry of Osmium carbonyl clusters containing organomercurials and azo-compounds /." Hong Kong : University of Hong Kong, 1999. http://sunzi.lib.hku.hk/hkuto/record.jsp?B21021545.

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6

Clarke, Ronald James. "Kinetic and equilibrium studies of cyclodextrin-azo dye inclusion complexes /." Title page, contents and abstract only, 1985. http://web4.library.adelaide.edu.au/theses/09PH/09phc5992.pdf.

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Thesis (Ph. D.)--University of Adelaide, Dept. of Physical and Inorganic Chemistry, 1985.
Offprints of two author's journal articles inserted at end of the v. Includes bibliographical references (leaves 10-12).

7

McNair, Craig. "Synthetic approaches to substituted Ca4B-type azo compounds." Thesis, University of Strathclyde, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.366902.

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8

Shahkar, G. R. "Thermal decomposition of azo compounds in the gas phase." Thesis, Swansea University, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.638804.

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9

West, Lee Charles. "A study of bibracchial lariat ether complexes and linked cyclodextrin dimer complexes." Title page, contents and abstract only, 2000. http://web4.library.adelaide.edu.au/theses/09PH/09phw5182.pdf.

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Includes errata attached to first leaf. Includes bibliographical references. The complexation of a range of monovalent and divalent metal ions by the bibracchial lariat ethers has been investigated. Also investigates the complexation of metal ions and the anionic azo dye Brilliant Yellow by the diazacrown linked cyclodextrin dimers.

10

Hywel, Meilir. "Laser control of the photoisomerisation of azo-compounds : a theoretical study." Thesis, Bangor University, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.520068.

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Книги з теми "Azo compounds":

1

R, Cary, Dobson S, Ball Ellen M, World Health Organization, International Program on Chemical Safety., and Inter-Organization Programme for the Sound Management of Chemicals., eds. Azodicarbonamide. Geneva: World Health Organization, 1999.

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2

H, Liu Michael T., ed. Chemistry of diazirines. Boca Raton, Fla: CRC Press, 1987.

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3

Joseph Johannes Gerardus Steven van Es. 1, 3-cycloaddition reactions of diphenylphosphinoyl-activated azomethine ylides and 2-azaallyl anions: Synthetic applications and mechanistic aspects. 'S-Gravenhage: Pasmans Offsetdrukkerij BV, 1992.

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4

Zhao, Yue. Smart light-responsive materials: Azobenzene-containing polymers and liquid crystals. Hoboken, N.J: Wiley, 2009.

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5

Bradshaw, J. S. Aza-crown macrocycles. New York: Wiley, 1993.

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6

Commission, Monopolies and Mergers. Valhi Inc and Akzo NV: A report on the proposed merger. London: HMSO, 1991.

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7

1934-, Neu Harold C., Young Lowell S, and Zinner Stephen H. 1939-, eds. The New macrolides, azalides, and streptogramins: Pharmacology and clinical applications. New York: M. Dekker, 1993.

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8

Patai, Saul. Chemistry of the Hydrazo, Azo and Azoxy Groups. Wiley & Sons, Incorporated, John, 2006.

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9

Patai, Saul. Chemistry of the Hydrazo, Azo and Azoxy Groups. Wiley & Sons, Incorporated, John, 2008.

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10

Rappoport, Zvi, and Saul Patai. Chemistry of the Hydrazo, Azo and Azoxy Groups, Volume 2. Wiley & Sons, Incorporated, John, 2000.

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Частини книг з теми "Azo compounds":

1

Koeber, Karl, Helga Köttelwesch, Dietrich Schneider, Helga Demmer, and Edith Schleitzer-Rust. "Complexes with Azo Compounds." In Mn Manganese D 5, 278–317. Berlin, Heidelberg: Springer Berlin Heidelberg, 1987. http://dx.doi.org/10.1007/978-3-662-08175-4_8.

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2

Davies, A. G. "17.9.4 Radical cations of azo compounds." In Phosphorus-Centered Radicals, Radicals Centered on Other Heteroatoms, Organic Radical Ions. Part 2, 425–34. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-540-87641-0_43.

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3

Horowitz, A., and L. A. Rajbenbach. "Radiation chemistry of hydrazo and azo compounds." In Chemistry of Functional Groups, 313–27. Chichester, UK: John Wiley & Sons, Ltd., 2013. http://dx.doi.org/10.1002/9780470686317.ch10.

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4

Mackenzie, Kenneth. "Formation and fragmentation of cyclic azo compounds." In Chemistry of Functional Groups, 329–442. Chichester, UK: John Wiley & Sons, Ltd., 2013. http://dx.doi.org/10.1002/9780470686317.ch11.

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5

Bruce, M. I., and B. L. Goodall. "The transition metal chemistry of azo compounds." In Chemistry of Functional Groups, 259–311. Chichester, UK: John Wiley & Sons, Ltd., 2013. http://dx.doi.org/10.1002/9780470686317.ch9.

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6

Thomas, F. G., and K. G. Boto. "The electrochemistry of azoxy, azo and hydrazo compounds." In Chemistry of Functional Groups, 443–93. Chichester, UK: John Wiley & Sons, Ltd., 2013. http://dx.doi.org/10.1002/9780470686317.ch12.

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7

Tam, S. W. "Mass spectra of hydrazo, azo and azoxy compounds." In Chemistry of Functional Groups, 109–27. Chichester, UK: John Wiley & Sons, Ltd., 2013. http://dx.doi.org/10.1002/9780470686317.ch5.

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8

Pardasani, R. T., and P. Pardasani. "Magnetic properties of dinuclear cobalt(II) complex with ONNO donor azo dye." In Magnetic Properties of Paramagnetic Compounds, 1233. Berlin, Heidelberg: Springer Berlin Heidelberg, 2017. http://dx.doi.org/10.1007/978-3-662-54231-6_727.

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9

Pardasani, R. T., and P. Pardasani. "Magnetic properties of dinuclear cobalt(II) complex with chelating azo dye ligand." In Magnetic Properties of Paramagnetic Compounds, 1234–35. Berlin, Heidelberg: Springer Berlin Heidelberg, 2017. http://dx.doi.org/10.1007/978-3-662-54231-6_728.

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Pardasani, R. T., and P. Pardasani. "Magnetic properties of dinuclear cobalt(II) complex with chelating azo dye ligand." In Magnetic Properties of Paramagnetic Compounds, 1236–37. Berlin, Heidelberg: Springer Berlin Heidelberg, 2017. http://dx.doi.org/10.1007/978-3-662-54231-6_729.

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Тези доповідей конференцій з теми "Azo compounds":

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Simu, Georgeta M., Gianina Bals, Mihaiel ANDONI, Germaine Savoiu-Blaint, Maria Grad, and Anca Dragomirescu. "AZO COMPOUNDS WITH ANTIMICROBIAL ACTIVITY." In The 14th International Electronic Conference on Synthetic Organic Chemistry. Basel, Switzerland: MDPI, 2010. http://dx.doi.org/10.3390/ecsoc-14-00492.

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Czaplicki, Robert, Sylvie Dabos Seignon, Francois Kajzar, Mina Bakasse, Jacek Niziol, Monika Bednarz, and Bouchta Sahraoui. "Functionalized Azo-Carbazole Compounds for Nonlinear Optical Application." In Proceedings of 2006 8th International Conference on Transparent Optical Networks. IEEE, 2006. http://dx.doi.org/10.1109/icton.2006.248336.

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Petruskevicius, R., D. Urbonas, M. Gabalis, A. Balcytis, G. Seniutinas, R. Tomasiunas, and V. Getautis. "Optical poling of azo-compounds for applications in nanophotonics." In 2013 15th International Conference on Transparent Optical Networks (ICTON). IEEE, 2013. http://dx.doi.org/10.1109/icton.2013.6602722.

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Haddad, Batool S., and Mariam Abdul-bary. "Synthesis of new Azo compounds combining with heterocyclic groups." In International Conference of Chemistry and Petrochemical Techniques (ICCPT). AIP Publishing, 2022. http://dx.doi.org/10.1063/5.0093536.

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Tadić, Julijana D., Jelena M. Lađarević, Maja D. Marković, Aleksandra M. Ivanovska, Mirjana M. Kostić, and Dušan Ž. Mijin. "A NOVEL AZO-AZOMETHINE DYE: SYNTHESIS, DYEING AND ANTIOXIDANT PROPERTIES." In 1st INTERNATIONAL Conference on Chemo and BioInformatics. Institute for Information Technologies, University of Kragujevac, 2021. http://dx.doi.org/10.46793/iccbi21.379t.

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Schiff bases, or azomethine compounds, are commonly employed in the fields of organic synthesis, metal complexes, materials, and engineering. Especially, they have gained importance in medicinal researches, considering their antimicrobial, anticancer, anti- inflammatory, and antioxidant properties. On the other side, azo dyes are the most significant group of synthetic dyes, utilized in textile fiber dyeing. Conjugation of Schiff bases with azo compounds leads to the class of azo-azomethine dyes, which have numerous applications related to their coloration and biological properties. Viscose is a textile material widely used in the medicine. Moreover, viscose fiber can be engineered in many ways which are significant in the development of medical materials. The antioxidant effect is an important feature of medical textiles, such as wound dressings. In this work, the microwave-assisted synthesis and characterization of novel azo-azomethine dye are reported. The azo-azomethine dye is obtained by the condensation between arylazo pyridone dye and 4-aminophenol. The structure of synthesized dye was determined by ATR-FTIR, NMR, and UV-Vis spectroscopy. Azo- azomethine dye was used for dyeing viscose, and the washing fastness of dyed material was evaluated according to the standard method. The viscose fabrics, before and after washing, were analyzed in terms of their color coordinates in the CIELab color space. The antioxidant properties of azo-azomethine dye and dyed viscose fabrics were examined by the ABTS method.

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Umeda, Minoru. "Electron transfer and geminate pair dissociation processes in layered photoreceptors containing azo compounds." In SPIE's International Symposium on Optical Science, Engineering, and Instrumentation, edited by Stephen Ducharme and James W. Stasiak. SPIE, 1998. http://dx.doi.org/10.1117/12.328162.

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Körtvélyesi, T., M. Görgényi, and L. Seres. "Estimation and prediction of the retention indices using quantum-chemical calculations: alkanes and azo compounds." In The first European conference on computational chemistry (E.C.C.C.1). AIP, 1995. http://dx.doi.org/10.1063/1.47697.

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Jamain, Zuhair, Samerah Habil, Mohamad Zul Hilmey Makmud, and Melati Khairuddean. "Synthesis, Structural and Dielectric Characteristics of Liquid Crystalline Azo-Based Compounds with Different Terminal Length." In 2021 IEEE International Conference on the Properties and Applications of Dielectric Materials (ICPADM). IEEE, 2021. http://dx.doi.org/10.1109/icpadm49635.2021.9493959.

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Jing Xiaoping and Wu changcheng. "Synthesis and characterization of dimesogenic liquid crystalline compounds containing cholesteryl and azo-imine linking group." In 2011 International Conference on Remote Sensing, Environment and Transportation Engineering (RSETE). IEEE, 2011. http://dx.doi.org/10.1109/rsete.2011.5965822.

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Zuben, Theodora Von, Airton Salles Junior, and Gabriela de Souza. "A metal-catalyst-free oxidative coupling of anilines to aromatic azo compounds in water using bleach." In Congresso de Iniciação Científica UNICAMP. Universidade Estadual de Campinas, 2019. http://dx.doi.org/10.20396/revpibic2720192327.

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Звіти організацій з теми "Azo compounds":

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Marinov, Yordan G., and Georgi B. Hadjichristov. Electro-optical Characteristics of Thin Films of Aerosil-7CB Nematic Gel Nanocomposites Doped with Photoresponsive Liquid Crystalline Azo - compounds. "Prof. Marin Drinov" Publishing House of Bulgarian Academy of Sciences, October 2020. http://dx.doi.org/10.7546/crabs.2020.10.05.

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Phillips, Donald A., Yitzhak Spiegel, and Howard Ferris. Optimizing nematode management by defining natural chemical bases of behavior. United States Department of Agriculture, November 2006. http://dx.doi.org/10.32747/2006.7587234.bard.

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This project was based on the hypothesis that nematodes interacting with plants as either parasites or beneficial saprophytes are attracted to their host by natural products. This concept was supported by numerous observations that parasitic nematodes are attracted to root exudates. Our overall goal was to identify nematode sensory compounds from root exudates and to use that information for reducing nematicide applications. We applied skills of the investigators to achieve three specific objectives: 1) Identify nematode behavioral cues (e.g., attractants or repellents) in root exudates; 2) Identify new natural nematicidal compounds; and 3) Combine a natural attractant and a nematicide into a nematode trap. Because saprophytic nematodes benefit plants by mineralizing organic matter, we sought compounds attractive primarily to parasitic nematodes. The project was constructed on several complementary foundations. First, data from Dr. Spiegel’s lab showed that under aseptic conditions Ditylenchus dipsaci, a parasite on onion, is attracted to certain fractions of onion root exudates. Second, PI Phillips had a sizeable collection of natural plant products he had identified from previous work on Rhizobium-legume interactions, which could be tested “off the shelf”. Third, Dr. Ferris had access to aseptic and natural populations of various saprophytic and parasitic nematodes. The project focused on five nematode species: D.dipsaci, Heterodera avenae, and Tylenchulussemipenetransat ARO, and Meloidogyne javanicand Caenorhabditis elegans at UCD. Ten pure plant compounds, mostly flavonoids, were tested on the various nematode species using six different assay systems. Results obtained with assorted test systems and by various scientists in the same test systems were essentially irreproducible. Many convincing, Many convincing, i.e. statistically significant, results in one system or with one investigator could not be repeated with other assays or different people. A recent report from others found that these compounds, plus another 30, were inactive as attractants in three additional parasitic nematode species (Wuyts et al. Nematology 8:89- 101, 2006). Assays designed to test the hypothesis that several compounds together are required to attract nematodes have thus far failed to find a reproducibly active combination. In contrast to results using pure plant compounds, complex unfractionated exudates from aseptic onion root reproducibly attracted D. dipsaci in both the ARO and UCD labs. Onion root exudate collection, separation into HPLC fractions, assays using D. dipsaci and MS-MS experiments proceeded collaboratively between ARO and UCD without any definitive identification of an active compound. The final active fraction contained two major molecules and traces of several other compounds. In the end, analytical studies were limited by the amount of onion root exudate and the complexity of the purification process. These tests showed that aseptic plant roots release attractant molecules, but whether nematodes influence that release, as insects trigger release of attractants from plants, is unknown. Related experiments showed that the saprophyte C. elegans stimulates its prey, Pseudomonas bacteria, to increase production of 2, 4-diacetylphloroglucinol (DAPG) a compound that promotes amino acid exudation by plant roots. It is thus possible that saprophytic nematodes are attracted primarily to their bacterial or fungal prey and secondarily to effects of those microorganisms on root exudation. These observations offer promising avenues for understanding root-zone interactions, but no direct routes to controlling nematodes in agriculture were evident. Extracts from two plant sources, Chrysanthemum coronarium and Sequoia sempervirens, showed nematicidal activity at ARO and UCD, respectively. Attempts to purify an active compound from S. sempervirens failed, but preliminary results from C. coronarium are judged to form a potential basis for further work at ARO. These results highlight the problems of studying complex movement patterns in sentient organisms like nematodes and the issues associated with natural product isolation from complex mixtures. Those two difficulties combined with complications now associated with obtaining US visas, slowed and ultimately limited progress on this project. As a result, US investigators expended only 65% of the $207,400 originally planned for this project. The Israeli side of the project advanced more directly toward its scientific goals and lists its expenditures in the customary financial report.

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Galili, Gad, Harry J. Klee, and Asaph Aharoni. Elucidating the impact of enhanced conversion of primary to secondary metabolism on phenylpropanoids secondary metabolites associated with flavor, aroma and health in tomato fruits. United States Department of Agriculture, January 2012. http://dx.doi.org/10.32747/2012.7597920.bard.

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• Targeted manipulating Phenylalanine (Phe) synthesis is one of the most powerful strategies to boost the biologically and economically important secondary metabolites, including phenylpropaniods, aromatic volatiles and specialized secondary metabolites. • Over-expression of the petunia MYB transcript factor, ODORANT1 (ODO1), results in significant alterations of the levels of specific phenylpropanoid compounds in plants. • Our previous studies indicated that ectopic expression of the feedback-insensitive AroG could break the bottleneck between primary and secondary metabolisms in tomato, thereby aiding in producing new tomato composition and identifying the unknown roles of multiple key regulators in specialized metabolism. Therefore, combining the AroG and ODO1 is of particular interest for elucidating the combined regulatory role of both of these genes in the Phe metabolic pathway, as well as generating tomato fruits that contain higher levels of secondary metabolites. • Here, we performed the LC-MS and GC-MS analyses on fruits of four tomato genotypes, namely, wild type tomato fruits as well as tomato fruits expressing the AroG, ODO1 and the combination of AroG plus ODO1 (AO) genotypes. Our results elaborated that the levels of many of the Phe-derived metabolites were predominately altered in fruits of the AO genotype, compared to tomato fruits expressing either AroG or ODO1 individually. The levels of most of these metabolites were significantly stimulated, such as Tyrosine (Tyr), coumaric acid and ferulic acid derived metabolites, but the levels of some important secondary metabolites were reduced in the AO transgenic genotypes as compared to either AroG or ODO1 lines. Nevertheless, our results also revealed that the levels of aromatic volatiles were obviously down regulated in the AO, compared to that in AroG transgenic fruits, but were boosted while compared to the wild type and ODO1 transgenic fruits. • Our results suggest that ODO1 expression may also have a negative effect on the production of some of the aromatic volatiles in tomato fruits, indicating that ODO1 acts as an important regulator of the shikimate pathway, which leads to the production of the aromatic amino acids and secondary metabolites derived from them. Key words: AroG, ODO1, tomato, metabolism, shikimate pathway