Category: 36428-96-3

Schneider, Joanne published the artcileDegradation of pyrene, benz[a]anthracene, and benzo[a]pyrene by Mycobacterium sp. strain RJGII-135, isolated from a former coal gasification site, Related Products of chlorides-buliding-blocks, the main research area is Mycobacterium metabolism pyrene benzanthracene benzopyrene pollutant.

The degradation of three polycyclic aromatic hydrocarbons (PAH), pyrene (PYR), benz[a]anthracene (BAA), and benzo[a]pyrene (BaP), by Mycobacterium sp. strain RJGII-135 was studied. The bacterium was isolated from an abandoned coal gasification site soil by analog enrichment techniques and found to mineralize [14C]PYR. Further degradation studies with PYR showed three metabolites formed by Mycobacterium sp. strain RJGII-135, including 4,5-phenanthrenedicarboxylic acid not previously isolated, 4-phenanthrenecarboxylic acid, and 4,5-pyrenedihydrodiol. At least two dihydrodiols, 5,6-BAA-dihydrodiol and 10,11-BAA-dihydrodiol, were confirmed by high-resolution mass spectral and fluorescence analyses as products of the biodegradation of BAA by Mycobacterium sp. strain RJGII-135. Addition, a cleavage product of BAA was also isolated. Mass spectra and fluorescence data support two different routes for the degradation of BaP by Mycobacterium sp. strain RJGII-135. The 7,8-BaP-dihydrodiol and three cleavage products of BaP, including 4,5-chrysenedicarboxylic acid and a dihydropyrenecarboxylic acid metabolite, have been isolated and identified as degradation products formed by Mycobacterium sp. strain RJGII-135. These latter results represent the first example of the isolation of BaP ring fission products formed by a bacterial isolate. We propose that while this bacterium appears to attack only one site of the PYR mol., it is capable of degrading different sites of the BAA and BaP mols., and although the sites of attack may be different, the ability of this bacterium to degrade these PAH is well supported. The proposed pathways for biodegradation of these compounds by this Mycobacterium sp. strain RJGII-135 support the dioxygenase enzymic processes reported previously for other bacteria. Microorganisms like Mycobacterium sp. strain RJGII-135 will be invaluable in attaining the goal of remediation of sites containing mixtures of these PAH.

Applied and Environmental Microbiology published new progress about Coal gasification. 36428-96-3 belongs to class chlorides-buliding-blocks, name is Pyrene-2-carboxylic acid, and the molecular formula is C17H10O2, Related Products of chlorides-buliding-blocks.

Referemce:
Chloride – Wikipedia,
Chlorides – an overview | ScienceDirect Topics

Wu, Junchen published the artcileA Molecular Peptide Beacon for the Ratiometric Sensing of Nucleic Acids, Name: Pyrene-2-carboxylic acid, the main research area is mol peptide beacon preparation ratiometry fluorescence sensor DNA.

A pyrene-functionalized cationic oligopeptide I efficiently binds to double-stranded DNA, as shown by different spectrophotochem. studies. Upon binding, the conformation of I changes from a folded to an extended form, which leads to a distinct change in the fluorescence properties. Thus, I functions as a mol. peptide beacon, and as it is easily taken up by cells, I can also be used for imaging of nucleic acids within cells.

Journal of the American Chemical Society published new progress about Biological uptake. 36428-96-3 belongs to class chlorides-buliding-blocks, name is Pyrene-2-carboxylic acid, and the molecular formula is C17H10O2, Name: Pyrene-2-carboxylic acid.

Referemce:
Chloride – Wikipedia,
Chlorides – an overview | ScienceDirect Topics

Kar, Tapas published the artcileSite Preferences of Carboyxl Groups on the Periphery of Graphene and Their Characteristic IR Spectra, Application In Synthesis of 36428-96-3, the main research area is site preference carboyxl group periphery graphene IR spectrum.

Energetics of carboxyl groups at the periphery of a graphene sheet are studied using d. functional theory (B3LYP) with a 6-31G* basis set, augmented with diffuse functions on O. Corner sites are energetically preferred followed by zigzag edges, and armchair edges are least stable. The energy and geometry of each is attributed to a competition between π-conjugation and steric repulsion factors. Vibrational analyses reveal certain features that are characteristic of each site location, which may help in the assignment of exptl. spectra of graphene and other polycyclic aromatic hydrocarbons. For example, zigzag sites typically lead to an intense C=O stretching band that occurs below 1700 cm-1, quite uncommon for the carboxyl group.

Journal of Physical Chemistry C published new progress about Ab initio methods. 36428-96-3 belongs to class chlorides-buliding-blocks, name is Pyrene-2-carboxylic acid, and the molecular formula is C17H10O2, Application In Synthesis of 36428-96-3.

Referemce:
Chloride – Wikipedia,
Chlorides – an overview | ScienceDirect Topics

Hara, Nobuyuki published the artcileInter- and intramolecular excimer circularly polarised luminescence of planar chiral paracyclophane-pyrene luminophores, Computed Properties of 36428-96-3, the main research area is paracyclophane pyrene luminophore intramol excimer.

Two types of planar chiral [2,2]paracyclophane-pyrene luminophores (1 and 2) with different binding positions of the fluorescent pyrene units were synthesized. (R)/(S)-1 with 1-pyrene units exhibited green intermol. excimer circularly polarised luminescence (CPL) at 530 nm in the KBr-pellet, but exhibited no CPL signal in dilute CHCl3 solution In contrast, (R)/(S)-2 with 2-pyrene units exhibited a blue intramol. excimer CPL at 450 nm in CHCl3 solution This is the first example of using the binding position of pyrene and the external environment to tune the type (inter- or intramol.) and chiroptical sign of excimer CPL.

RSC Advances published new progress about Circular dichroism. 36428-96-3 belongs to class chlorides-buliding-blocks, name is Pyrene-2-carboxylic acid, and the molecular formula is C17H10O2, Computed Properties of 36428-96-3.

Referemce:
Chloride – Wikipedia,
Chlorides – an overview | ScienceDirect Topics

Toya, Michihisa published the artcileSynthesis and properties of helically-folded poly(arylenediethynylene)s, Product Details of C17H10O2, the main research area is polyarylenediethynylene helical foldamer naphthalene pyrene pyridine polymerization photophys property.

Aryl-based helical foldamers with diacetylene linkers are not only capable of providing phys. large diameter cavities, but can also showcase a variety of properties, such as structural transformation, that the corresponding foldamers with simple acetylene linkers cannot achieve. Here, the authors have developed helical foldamers based on poly(arylene diethynylene)s (poly-ArDEs), in which each aryl group is connected by diacetylene linkers. The poly-ArDEs with naphthalene, pyrene and pyridine as a central aryl group each expressed unique properties. The foldamers incorporating naphthalene and pyrene stabilized the helical folding in a variety of solvents. In addition, the concentration-dependent emission by the pyrene polymer was completely different from that of the monomer due to its folded three-dimensional structure. The pyridine-based polymer showed unexpected solvent dependence and stimuli responsiveness, suggesting possible applications in sensing. These properties were elucidated in detail by UV-Vis absorption, fluorescence, and CD spectra, mol. dynamics calculations, and titration experiments

Polymer Chemistry published new progress about Circular dichroism. 36428-96-3 belongs to class chlorides-buliding-blocks, name is Pyrene-2-carboxylic acid, and the molecular formula is C17H10O2, Product Details of C17H10O2.

Referemce:
Chloride – Wikipedia,
Chlorides – an overview | ScienceDirect Topics

Mayr, Stefanie published the artcileSize-Driven Inversion of Selectivity in Esterification Reactions: Secondary Beat Primary Alcohols, Category: chlorides-buliding-blocks, the main research area is secondary primary alc acylation anhydride esterification selectivity MSPR.

Relative rates for the Lewis base-mediated acylation of secondary and primary alcs. carrying large aromatic side chains with anhydrides differing in size and electronic structure have been measured. While primary alcs. react faster than secondary ones in transformations with monosubstituted benzoic anhydride derivatives, relative reactivities are inverted in reactions with sterically biased 1-naphthyl anhydrides. Further anal. of reaction rates shows that increasing substrate size leads to an actual acceleration of the acylation process, the effect being larger for secondary as compared to primary alcs. Computational results indicate that acylation rates are guided by noncovalent interactions (NCIs) between the catalyst ring system and the DED substituents in the alc. and anhydride reactants. Thereby stronger NCIs are formed for secondary alcs. than for primary alcs.

Journal of Organic Chemistry published new progress about Activation enthalpy. 36428-96-3 belongs to class chlorides-buliding-blocks, name is Pyrene-2-carboxylic acid, and the molecular formula is C17H10O2, Category: chlorides-buliding-blocks.

Referemce:
Chloride – Wikipedia,
Chlorides – an overview | ScienceDirect Topics

Benniston, Andrew C. published the artcileIntramolecular excimer formation and delayed fluorescence in sterically constrained pyrene dimers, Safety of Pyrene-2-carboxylic acid, the main research area is intramol excimer delayed fluorescence sterically constrained pyrene dimer.

The synthesis is described for five mol. dyads comprising pyrene-based terminals covalently linked through a 1,3-disubstituted phenylene spacer. The extent of through-space communication between the pyrene units is modulated by steric interactions imposed by bulky moieties attached at the 6,8-positions of each pyrene unit. For the control compound, only hydrogen atoms occupy the 6,8 positions (DP1), whereas the remaining compounds incorporate ethynylene groups terminated with either triisopropylsilyl (DP2), 1-tert-butylbenzene (DP3), 2,6-di-tert-butylbenzene (DP4) or 1-tert-butyl-3,5-dimethylbenzene (DP5) units. Each compound shows a mixture of monomer and excimer fluorescence in fluid solution at room temperature, but only monomer emission in a glassy matrix at 77 K. The ratio of monomer to excimer fluorescence depends markedly on the mol. structure; DP1 is heavily biased in favor of the excimer and DP4 is enriched with monomer fluorescence. Photophys. properties, including laser induced and delayed fluorescence data, are reported for each compound Delayed fluorescence occurs by both intramol. and bimol. steps, but these events take place on different timescales. The possibility is raised for using intramol. triplet-triplet annihilation as a means of mol. imaging.

Chemistry – A European Journal published new progress about Correlation analysis. 36428-96-3 belongs to class chlorides-buliding-blocks, name is Pyrene-2-carboxylic acid, and the molecular formula is C17H10O2, Safety of Pyrene-2-carboxylic acid.

Referemce:
Chloride – Wikipedia,
Chlorides – an overview | ScienceDirect Topics

ter Wiel, Matthijs K. J. published the artcileSynthesis of functionalized molecular motors, Name: Pyrene-2-carboxylic acid, the main research area is mol motor biphenanthrenylidene bicyclopentanaphthalenylidene preparation.

Synthetic routes to two mol. motors are reported. The sterically hindered central olefinic bond connecting the two halves of these C2-sym. mols. was prepared by a McMurry reaction. In this way, a motor with two five-membered rings and a motor with two six-membered rings were prepared, both with two versatile methoxy substituents at positions not interfering with the rotary behavior.

Synthesis published new progress about McMurry coupling reaction. 36428-96-3 belongs to class chlorides-buliding-blocks, name is Pyrene-2-carboxylic acid, and the molecular formula is C17H10O2, Name: Pyrene-2-carboxylic acid.

Referemce:
Chloride – Wikipedia,
Chlorides – an overview | ScienceDirect Topics

Murakami, Takaya published the artcilePorphyrin-dye sensitized solar cell utilizing nitroxide radical mediator, Application In Synthesis of 36428-96-3, the main research area is nitroxide radical mediator porphyrin dye sensitized solar cell.

The application of nitroxide radical mediator and porphyrin dye to dye-sensitized solar cell (DSSC) was reported. A typical porphyrin 5,10,15,20-tetra(4-carboxyphenyl)porphyrin-Zn(II) (ZnTCCP) was utilized as a dye sensitizer and 1-pyrene carbonate as light-harvesting antenna dye. DSSC using the nitroxide radical 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO) and ZnTCCP with deoxychoal acid gave maximum properties. The DSSC which was common absorption of ZnTCCP and pyrene was decrease of photovoltaic performance. Such decrease gave less absorption of ZnTCCP due to excess pyrene dye.

Journal of Photopolymer Science and Technology published new progress about Dye-sensitized solar cells. 36428-96-3 belongs to class chlorides-buliding-blocks, name is Pyrene-2-carboxylic acid, and the molecular formula is C17H10O2, Application In Synthesis of 36428-96-3.

Referemce:
Chloride – Wikipedia,
Chlorides – an overview | ScienceDirect Topics

Poelloth, Benjamin published the artcileThe Size-Accelerated Kinetic Resolution of Secondary Alcohols, Application of Pyrene-2-carboxylic acid, the main research area is secondary alc kinetic resolution acylation side chain size enantioselectivity; acylation; asymmetric catalysis; kinetic resolution; molecular recognition; noncovalent interactions.

The factors responsible for the kinetic resolution of alcs. by chiral pyridine derivatives have been elucidated by measurements of relative rates for a set of substrates with systematically growing aromatic side chains using accurate competitive linear regression anal. Increasing the side chain size from Ph to pyrenyl results in a rate acceleration of more than 40 for the major enantiomer. Based on this observation a new catalyst with increased steric bulk has been designed that gives enantioselectivity values of up to s=250. Extensive conformational anal. of the relevant transition states indicates that alc. attack to the more crowded side of the acyl-catalyst intermediate is favored due to stabilizing CH-π-stacking interactions. Exptl. and theor. results imply that enantioselectivity enhancements result from accelerating the transformation of the major enantiomer through attractive non-covalent interactions (NCIs) rather than retarding the transformation of the minor isomer through repulsive steric forces.

Angewandte Chemie, International Edition published new progress about Acylation catalysts (stereoselective). 36428-96-3 belongs to class chlorides-buliding-blocks, name is Pyrene-2-carboxylic acid, and the molecular formula is C17H10O2, Application of Pyrene-2-carboxylic acid.

Referemce:
Chloride – Wikipedia,
Chlorides – an overview | ScienceDirect Topics