- Efficient singlet oxygen generation by triptycene substituted A3B type zinc(II) phthalocyanine photosensitizers
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A3B type unsymmetrical 8,11,15,18,22,25-hexadecyl-2,3-(9,10-dioctyl-6,7-dimethoxy-2,3-dioxytriptycene) (11) and 8,11,15,18,22,25-hexadecyl-2,3-(9,10-diundecyl-6,7-dimethoxy-2,3-dioxytriptycene) (12) zinc(II) phthalocyanines were synthesized for
- Al-Sohaimi, Bandar R.,Pi?kin, Mehmet,Ghanem, Bader S.,Al-Raqa, Shaya Y.,Durmu?, Mahmut
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Read Online
- A fluorescent probe for rapid detection of thiols and imaging of thiols reducing repair and H2O2 oxidative stress cycles in living cells
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A diselenide containing fluorescent probe based on a fluorescein scaffold for thiols was developed. The fluorescent probe exhibited rapid response, high selectivity and reversibility. Confocal fluorescence microscopy was used to visualize the redox change
- Lou, Zhangrong,Li, Peng,Sun, Xiaofei,Yang, Songqiu,Wang, Bingshuai,Han, Keli
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supporting information
p. 391 - 393
(2013/02/22)
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- Nanoparticles of organosilane-based nitrite ionic liquid immobilized on silica for the diazotization of aniline derivatives and subsequent synthesis of azo dyes
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Imidazolium based nitrite ionic liquid containing trimethoxysilyl group was prepared from the reaction of N-methylimidazole and (3-chloropropyl) trimethoxysilane. This ionic liquid was immobilized on silica covalently to give nanoparticles with the imidazolium nitrite moiety remaining intact. The diazotization reaction was performed as a model reaction to examine the activity of these nanoparticles as a nitrosonium source. Excellent performance was exhibited in the diazotization reaction of various aniline derivatives in the presence of HCl under mild heterogeneous conditions (room temperature and short reaction time). In-situ coupling of diazonium salts to a range of tertiary anilines, phenols and naphthols afforded the requisite azo dyes in good yield, using standard experimental procedures.
- Valizadeh, Hassan,Amiri, Mohammad,Hosseinzadeh, Fatemeh
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experimental part
p. 1308 - 1313
(2012/03/27)
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- Synthesis, structure, and glutathione peroxidase-like activity of amino acid containing ebselen analogues and diaryl diselenides
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The synthesis of some ebselen analogues and diaryl diselenides, which have amino acid functions as an intramolecularly coordinating group (Se O) has been achieved by the DCC coupling procedure. The reaction of 2,2′- diselanediylbis(5-tert-butylisophthalic acid) or the activated ester tetrakis(2,5-dioxopyrrolidin-1-yl) 2,2′-diselanediylbis(5-tert- butylisophthalate) with different C-protected amino acids (Gly, L-Phe, L-Ala, and L-Trp) afforded the corresponding ebselen analogues. The used precursor diselenides have been found to undergo facile intramolecular cyclization during the amide bond formation reaction. In contrast, the DCC coupling of 2,2′-diselanediyldibenzoic acid with C-protected amino acids (Gly, L/D-Ala and L-Phe) affords the corresponding amide derivatives and not the ebselen analogues. Some of the representative compounds have been structurally characterized by single-crystal X-ray crystallography. The glutathione peroxidase (GPx)-like activities of the ebselen analogues and the diaryl diselenides have been evaluated by using the coupled reductase assay method. Intramolecularly stabilized ebselen analogues show slightly higher maximal velocity (Vmax) than ebselen. However, they do not show any GPx-like activity at low GSH concentrations at which ebselen and related diselenides are active. This could be attributed to the peroxide-mediated intramolecular cyclization of the corresponding selenenyl sulfide and diaryl diselenide intermediates generated during the catalytic cycle. Interestingly, the diaryl diselenides with alanine (l,l or d,d) amide moieties showed excellent catalytic efficiency (kcat/KM) with low KM values in comparison to the other compounds. Peroxidase-like activity: Reaction of compound 1 (see figure) with glutathione (GSH) leads to the formation of the corresponding selenenyl sulfide and diaryl diselenide intermediates. The reaction of these intermediates with H2O2 leads to the formation of 1 via arylselenenic acid. This process hampers the GPx-like activity at low GSH concentrations.
- Selvakumar, Karuthapandi,Shah, Poonam,Singh, Harkesh B.,Butcher, Ray J.
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experimental part
p. 12741 - 12755
(2011/12/04)
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- Synthesis and structural characterization of sulfur rich iron (II) carbonyl dimers: Facile reversible reaction with carbon monoxide
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The sulfur-rich iron carbonyl dimer complexes [Fe(CO)2(S′SiS2)]2 (2), and [Fe(CO)(S′SiS2)]2 (3) have been prepared. The [2Fe-2S] cores of the new complexes are planar. The binding mode of the tridentate sulfur ligand in complex 2 is facial with a S(thiolate)-Fe-S(thiolate) angle of 92°, while in complex 3, the S′SiS2 ligand binds the metal with a S(thiolate)-M-S(thiolate) angle of 120°. The Fe-Fe distance is reduced from 3.45 A? in complex 2 to 2.78 A? in the 32 electron dimer complex 3. Complexes 2 and 3 are at equilibrium in solution and can be readily interconverted by addition or removal of CO.
- Carcer, Inigo Aguirre de,Heinekey, D. Michael
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scheme or table
p. 840 - 844
(2009/05/27)
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- Nanosized particles of benzimidazolone pigments
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A nanoscale pigment particle composition includes an organic benzimidazolone pigment, and a sterically bulky stabilizer compound, wherein the benzimidazolone pigment associates non-covalently with the sterically bulky stabilizer compound; and the presence of the associated stabilizer limits the extent of particle growth and aggregation, to afford nanoscale-sized pigment particles.
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Page/Page column 19; 20
(2009/04/24)
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- Diazo dyestuff compounds and their use
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The present invention relates to a diazo dyestuff compound of the following formula (I) wherein, M is H, Na, or Li. The formula (I) compound is particularly suitable for using as a component in a black dye composition for ink-jet printing ink, and inkjet printing inks with good light-fastness are obtained.
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Page/Page column 3
(2008/06/13)
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- 2-[[1-[[(2,3-DIHYDRO-2-OXO-1H-BENZIMIDAZOL-5-YL)AMINO]CARBONYL]-2-OXOPROPYL]AZO]-BENZOIC ACID AND A PROCESS FOR ITS PREPARATION
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The present invention is directed to 2-[[1-[[(2,3-dihydro-2-oxo-1H-benzimidazol-5- yl)amino]carbonyl]-2-oxopropyl]azo]-benzoic acid (C.I. Pigment Yellow 151): (I) , characterized by a ΔE* (black/white) in masstone below 22.0 ± 0.7, a process for its prepa
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Page/Page column 6-9
(2008/06/13)
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- PIGMENT DISPERSIONS WITH POLYMERIC DISPERSANTS HAVING PENDING CHROMOPHORE GROUPS.
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A pigment dispersion comprising a colour pigment represented by formula (I) wherein, R1 is selected from the group consisting of hydrogen, a halogen atom, a methyl group, an ethyl group, a methoxy group, an ethoxy group, -CF3 , -COOH, -COOCH3 and; R2, R4 and R5 are independently selected from the group consisting of hydrogen, a halogen atom, a methyl group, an ethyl group, a methoxy group, an ethoxy group,-CF3 , -COOH and -COOCH3; R3 is selected from the group consisting of hydrogen, a halogen atom, a methyl group, an ethyl group, a methoxy group, an ethoxy group,-CF3, -COOH, -COOCH3, -SO2NH-C6H5, -CONH-C6H5, -CONH-C6H5-CONH2 and -CONH2 ; R6 and R7 are independently selected from the group consisting of hydrogen, a halogen atom, a methyl group, an ethyl group, a methoxy group, an ethoxy group,- CF3 , -COOH and -COOCH3, or R6 and R7 represent the necessary atoms to form an imidazolone ring; and a polymeric dispersant having via a linking group covalently linked to its polymeric backbone at least one pending chromophore group which has a molecular weight smaller than 95% of the molecular weight of said colour pigment. The pigment dispersion can be advantageously used in inkjet inks.
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Page/Page column 45-46; 48-49
(2010/11/25)
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- METHOD FOR PRODUCING THIOSALICYLIC ACID
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The present invention relates to a method for causing sodium sulfide or a mixture of sodium sulfide and sulfur to react with diazonium salt formed by diazotizing anthranilic acid, wherein the Na/S atomic ratio as calculated on the basis of the employed sodium sulfide and sulfur is adjusted to within the range of 1.33 to 2.0 during the reaction. Thus is made practicable the manufacture of thiosalicylic acid in a high yield without going through the individual route of isolating and reducing dithiosalicylic acid.
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- Synthesis, characterization and antimicrobial studies of some novel 3- arylazo-7-hydroxy-4-methylcoumarins
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A series of 3-arylazo-7-hydroxy-4-methylcoumarins have been synthesized in excellent yields (80-90%) and their structures established on the basis of IR, 1H NMR, mass spectral data and elemental analyses. Their purity has been ascertained by ch
- Sharma, Pratibha,Pritmani, Shreeya
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p. 1139 - 1142
(2007/10/03)
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- Aryne formation from 1-(3′-Carboxyaryl)-3,3-dim ethyl trianzenes
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A study of the decomposition of 1-(2′-carboxyphenyl)-3,3-dimethyltriazene and the tetrabromoand tetrachloro- analogues showed that the arenediazonium-2-carboxylates were intermediates in the formation of the corresponding arynes: the 1-(2′-carboxyteirahalophenyl)-3,3-dimethyltriazenes are stable precursors that enable cycloaddition reactions of the tetrahalobenzynes to be carried out in acceptable yields using substrates such as N-methylpyrrole,p-xylene and m-dimethoxybenzene.
- Christopher Buxton,Heaney, Harry
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p. 3929 - 3938
(2007/10/02)
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- Crystal Structure of the Explosive Parent Benzyne Precursor: 2-Diazoniobenzenecarboxylate Hydrate
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The structure of the highly unstable benzyne precursor 2-diazoniobenzenecarboxylate (3) has been determined by single-crystal X-ray diffraction.The structure is discussed in comparison to ab initio results for several conformers of 3, related aromatic dia
- Horan, Christopher J.,Barnes, Charles L.,Glaser, Rainer
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p. 243 - 250
(2007/10/02)
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- Resonance Raman study of phenylhydrazonopropanedinitriles
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Resonance Raman spectra and band assignments of some phenylhydrazonopropanedinitriles, including the 3-chloro and the 2-carboxyderivatives, in the 900-2300 cm-1 spectral range are presented and discussed. 15N and 2H isotopic shifts have been us
- Merlin, Jean Claude,Thomas, Emrys W.,Petit, Guislaine
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p. 1840 - 1844
(2007/10/02)
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- Practical Multigram Syntheses of Benzocyclobutenediones
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Experimentally simple syntheses of benzocyclobutenedione and substituted benzocyclobutenediones (3-OH; 4-OH; 4-Me; 3-OH, 5-Me) are described which allow the synthesis of these compounds on large scale from inexpensive starting materials.The regiospecific and stereoselective cycloaddition of trimethylsiloxy dienes to 1,4-dichloro-3,3,4-trifluorocyclobutene forms the basis of the synthesis of the substituted benzocyclobutenediones.
- South, Michael S.,Liebeskind, Lanny S.
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p. 3815 - 3821
(2007/10/02)
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- Benzocyclobutenylidene-Cycloadditions, Reactivity, and Multiplicity
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EHT and CNDO/2 calculations on benzocyclobutenylidene (6) are described.Flash pyrolysis of the tosylhydrazone salt 7 affords benzocyclobutene and o-xylene in low yield, along with the formal syn and anti carbene dimers 13 and 14.Condensed-phase reactions were achieved by photolysis of the salt 15.Benzocyclobutenylidene (6) gave rise to the formal carbene dimers 17 and 18.Insertion of carbene 6 into the carbon-hydrogen bonds of 2,3-dimethylbutane produced the benzocyclobutenes 20 and 21 (insertion ratio tertiary:primary = 9:1).Cycloaddition of 6 to olefins gave only spirohexene derivatives 22.Multiplicity studies of 6 with cis or trans olefins indicated that 6 undergoes cycloaddition in a stereospecific manner.Competition experiments using dienes and monoolefins implicate an equilibrium between singlet and triplet 6.Further competition experiments with styrene/para-substituted styrene pairs demonstrated that 6 reacts faster with electron-poor styrenes.Possible explanations for this apparent anomaly are discussed.
- Duerr, Heinz,Nickels, Helmut,Pacala, Luba A.,Jones, Maitland
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p. 973 - 980
(2007/10/02)
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