Category: 146370-51-6

Murthy, A. V. R. published the artcileProbing the Role of Chain Length on the Diffusion Dynamics of π-Conjugated Polymers by Fluorescence Correlation Spectroscopy, Application In Synthesis of 146370-51-6, the publication is Journal of Physical Chemistry B (2011), 115(37), 10779-10788, database is CAplus and MEDLINE.

We investigate the role of the chain length and mol. weight distribution on the diffusion dynamics of freshly synthesized MEH-PPV polymer chains. For the above purpose, a new technique based on combination of size exclusion chromatog. (SEC) with fluorescence correlation spectroscopy (FCS) is developed to probe the diffusion dynamics of a narrow mol. weight distribution of fractionated samples of 20-500 kDa. The narrow dispersed samples were characterized by absorbance, emission, and time-resolved fluorescence decay techniques. The results revealed that the properties of fractionated samples were almost uniform for a wide range of mol. weights A maximum entropy based method for FCS data anal. is employed to obtain the correct diffusion coefficients of the polymer chains with heterogeneous dynamics. The FCS experiment on the unfractionated broad mol. weight sample is not enough to establish the correlation between the mol. weight of the chains with diffusion dynamics and emphasized the need for relatively monodispersed π-conjugated polymers. FCS results show that higher mol. weight chains diffuse much faster than shorter ones. Atomic force microscopy revealed that 300 kDa polymers produced 130 nm particles, whereas 50 kDa polymer chains formed micrometer size aggregates. At higher mol. weights, the strong chain interactions promote the formation of globular (or tightly packed) particles which diffuse faster in solution The low mol. weight chains experience strong interparticle interaction; as a consequence, the diffusion of chains becomes slower. In the present investigation, we demonstrate the need for the narrow polydisperse sample for establishing the correlation between diffusion dynamics and chain length (or mol. weights) of π-conjugated polymers using a single mol. spectroscopy technique such as FCS.

Journal of Physical Chemistry B published new progress about 146370-51-6. 146370-51-6 belongs to ethers-buliding-blocks, auxiliary class Benzene,Ether, name is 1-((2-Ethylhexyl)oxy)-4-methoxybenzene, and the molecular formula is C15H24O2, Application In Synthesis of 146370-51-6.

Referemce:
https://en.wikipedia.org/wiki/Ether,
Ether | (C2H5)2O – PubChem

Neef, C. J. published the artcileMEH-PPV: Improved Synthetic Procedure and Molecular Weight Control, Quality Control of 146370-51-6, the publication is Macromolecules (2000), 33(7), 2311-2314, database is CAplus.

Mechanistic studies on the polymerization of α,α’-dibromo-2-methoxy-5-(2-ethylhexyloxy)xylene have been performed. Polymerizations were initially carried out by adding potassium tert-butoxide to monomer in the presence of a chain transfer agent, anthracene. Anthracene showed little effect on the mol. weight of the resulting polymer, suggesting that the major polymerization route was not radically initiated. Polymerizations were also carried out by adding monomer to potassium tert-butoxide in presence of a nucleophile, 4-methoxyphenol. The mol. weight of the resulting polymer scaled linearly with the amount of 4-methoxyphenol, suggesting an anionic mechanism. In addition, each polymerization was monitored by in-situ torque measurements to further elucidate the polymerization mechanism and optimize polymerization conditions.

Macromolecules published new progress about 146370-51-6. 146370-51-6 belongs to ethers-buliding-blocks, auxiliary class Benzene,Ether, name is 1-((2-Ethylhexyl)oxy)-4-methoxybenzene, and the molecular formula is C15H24O2, Quality Control of 146370-51-6.

Referemce:
https://en.wikipedia.org/wiki/Ether,
Ether | (C2H5)2O – PubChem

Neef, C. J. published the artcileMEH-PPV: improved synthetic procedure and molecular weight control. [Erratum to document cited in CA132:308756], HPLC of Formula: 146370-51-6, the publication is Macromolecules (2004), 37(7), 2671, database is CAplus.

In Table 2 on page 2313, the polydispersity (PD) values for the polymerizations using 1.05 and 2.0% 4-methoxyphenol are listed as 1.52 and 1.14, resp. The correct PD values are 1.14 for 1.0% 4-methoxyphenol and 1.52 for 2.0% 4-methoxyphenol. The corrected table is given. The corrected values show a clear relation between the amount of 4-methoxyphenol and polymerization yield, mol. weights, and PD values.

Macromolecules published new progress about 146370-51-6. 146370-51-6 belongs to ethers-buliding-blocks, auxiliary class Benzene,Ether, name is 1-((2-Ethylhexyl)oxy)-4-methoxybenzene, and the molecular formula is C15H24O2, HPLC of Formula: 146370-51-6.

Referemce:
https://en.wikipedia.org/wiki/Ether,
Ether | (C2H5)2O – PubChem

Wild, Andreas published the artcileAnthracene- and thiophene-containing MEH-PPE-PPVs: Synthesis and study of the effect of the aromatic ring position on the photophysical and electrochemical properties, Safety of 1-((2-Ethylhexyl)oxy)-4-methoxybenzene, the publication is Journal of Polymer Science, Part A: Polymer Chemistry (2009), 47(9), 2243-2261, database is CAplus.

This contribution reports on the synthesis and characterization of thiophene- (P1, P2, and P3) and anthracene- (P4 and P5) containing PPE-PPV [poly(phenylene-ethynylene)-poly(phenylenevinylene)] copolymers. The thermostable, soluble and film-forming polymers were fully characterized by NMR, IR and elemental anal.; they exhibit high molar masses with polydispersity indexes below 2.5. The position of the thiophene in the polymeric backbone has insignificant influence on the spectroscopic properties of the polymers. In contrast, the anthracene-containing polymers reveal position dependent optical properties. A constant bathochromic shift of 50 nm was observed going from P4, where anthracene is surrounded by two double bonds, to P5, where anthracene is at the bridge between a triple bond and a double bond, as well as from P5 to P6 where anthracene is surrounded by two triple bonds. This correlates to the decrease of the observed anthracene band around 255 nm going from P4 through P5 to P6, amounting to the degree of contribution of the anthracene unit to the main chain conjugation. The phenomenon known as CN-PPV effect was observed in the case of P4 [Φ_f (solution) = 3%, Φ_f (solid) = 13%]. Electrochem. studies carried out under absolute inert conditions revealed lower electrochem. band gap energies, E_g^ec, than E_g^opt. © 2009 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 47: 2243-2261, 2009.

Journal of Polymer Science, Part A: Polymer Chemistry published new progress about 146370-51-6. 146370-51-6 belongs to ethers-buliding-blocks, auxiliary class Benzene,Ether, name is 1-((2-Ethylhexyl)oxy)-4-methoxybenzene, and the molecular formula is C10H16BNO2, Safety of 1-((2-Ethylhexyl)oxy)-4-methoxybenzene.

Referemce:
https://en.wikipedia.org/wiki/Ether,
Ether | (C2H5)2O – PubChem

Lin, King-Fu published the artcileOrigin of the methylene bonds in poly[2-methoxy-5-(2′-ethyl-hexyloxy)-1,4-phenylenevinylene] prepared according to Gilch’s method: novel applications, Formula: C15H24O2, the publication is Polymer International (2006), 55(8), 938-944, database is CAplus.

Impurities containing methylene bridges between 2-((2′-ethylhexyl)oxy)-5-methoxy-benzene mols. are inevitably formed during the synthesis of 1,4-bis(chloromethyl)-2-((2′-ethylhexyl)oxy)-5-methoxy-benzene, the monomer used in the preparation of poly[2-methoxy-5-(2′-ethyl-hexyloxy)-1,4-phenylenevinylene] (MEH-PPV), but they can be removed by double recrystallization of the monomer prior to polymerization When impurities containing methylene bridges participate in a Gilch polymerization, the methylene bonds formed in the main chains are prone to break at 200 °C, i.e., at least 150 °C below the major degradation temperature of defect-free MEH-PPV. Interestingly, the thermal treatment used to break the methylene bonds bonds present reduces the chain aggregation of MEH-PPV during film formation and induces its blends with poly(2,3-diphenyl-5-octyl-p-phenylene-vinylene) (DPO-PPV) to form a morphol. similar to that of block copolymers. Both significantly enhance the luminescence properties.

Polymer International published new progress about 146370-51-6. 146370-51-6 belongs to ethers-buliding-blocks, auxiliary class Benzene,Ether, name is 1-((2-Ethylhexyl)oxy)-4-methoxybenzene, and the molecular formula is C15H24O2, Formula: C15H24O2.

Referemce:
https://en.wikipedia.org/wiki/Ether,
Ether | (C2H5)2O – PubChem

Resta, Claudio published the artcileConsequences of Chirality on the Aggregation Behavior of Poly[2-methoxy-5-(2′-ethylhexyloxy)-p-phenylenevinylene] (MEH-PPV), Synthetic Route of 146370-51-6, the publication is Macromolecules (Washington, DC, United States) (2014), 47(15), 4847-4850, database is CAplus.

Poly[2-methoxy-5(2′-ethylhexoxy)-p-phenylenevinylene] (MEH-PPV) has been for the first time prepared and fully characterized in enantiopure (R) form. If the polymer mol. weight is sufficiently low, (R)-MEH-PPV assumes a helical supramol. structure in the solution aggregates, with consequences on the tendency to aggregation and on the fluorescence quenching, both of which are reduced with respect to the racemic analog.

Macromolecules (Washington, DC, United States) published new progress about 146370-51-6. 146370-51-6 belongs to ethers-buliding-blocks, auxiliary class Benzene,Ether, name is 1-((2-Ethylhexyl)oxy)-4-methoxybenzene, and the molecular formula is C15H24O2, Synthetic Route of 146370-51-6.

Referemce:
https://en.wikipedia.org/wiki/Ether,
Ether | (C2H5)2O – PubChem

Minar, Norma K. published the artcileGuided in Situ Polymerization of MEH-PPV in Mesoporous Titania Photoanodes, Related Products of ethers-buliding-blocks, the publication is ACS Applied Materials & Interfaces (2015), 7(19), 10356-10364, database is CAplus and MEDLINE.

Incorporation of conjugated polymers into porous metal oxide networks is a challenging task, which is being pursued via many different approaches. We have developed the guided in situ polymerization of poly(2-methoxy-5-(2′-ethylhexyloxy)-p-phenylenevinylene) (MEH-PPV) in porous titania films by means of surface functionalization. The controlled polymerization via the Gilch route was induced by an alkoxide base and by increasing the temperature The selected and specially designed surface-functionalizing linker mols. mimic the monomer or its activated form, resp. In this way, we drastically enhanced the amount of MEH-PPV incorporated into the porous titania phase compared to nonfunctionalized samples by a factor of 6. Addnl., photovoltaic measurements were performed. The devices show shunting or series resistance limitations, depending on the surface functionalization prior to in situ polymerization of MEH-PPV. We suggest that the reason for this behavior can be found in the orientation of the grown polymer chains with respect to the titania surface. Therefore, the geometry of the anchoring via the linker mols. is relevant for exploiting the full electronic potential of the conjugated polymer in the resulting hybrid composite. This observation will help to design future synthesis methods for new hybrid materials from conjugated polymers and n-type semiconductors to take full advantage of favorable electronic interactions between the two phases.

ACS Applied Materials & Interfaces published new progress about 146370-51-6. 146370-51-6 belongs to ethers-buliding-blocks, auxiliary class Benzene,Ether, name is 1-((2-Ethylhexyl)oxy)-4-methoxybenzene, and the molecular formula is C15H24O2, Related Products of ethers-buliding-blocks.

Referemce:
https://en.wikipedia.org/wiki/Ether,
Ether | (C2H5)2O – PubChem

Dellsperger, Simon published the artcileSynthesis and optical properties of novel poly(p-phenyleneethynylene)s, Application In Synthesis of 146370-51-6, the publication is Macromolecular Chemistry and Physics (2000), 201(2), 192-198, database is CAplus.

In order to explore the influence of chem. modifications on the photophys. properties of poly(p-phenyleneethynylene)s (PPEs), a series of PPE-copolymers was synthesized, employing Heck-type cross-coupling reactions. UV/Vis absorption and photoluminescence experiments clearly demonstrate that the design of PPE-copolymers which comprise conjugated segments of well-defined length and (aliphatic) spacers in a strictly alternating fashion allows to tune the bandgap to higher energies, and thus the absorption and emission maxima to shorter wavelengths. The derivatization of the PPE backbone with electron-withdrawing substituents, by contrast, is found to be significantly less effective and only leads to comparably small shifts in the absorption and emission spectra.

Macromolecular Chemistry and Physics published new progress about 146370-51-6. 146370-51-6 belongs to ethers-buliding-blocks, auxiliary class Benzene,Ether, name is 1-((2-Ethylhexyl)oxy)-4-methoxybenzene, and the molecular formula is C15H24O2, Application In Synthesis of 146370-51-6.

Referemce:
https://en.wikipedia.org/wiki/Ether,
Ether | (C2H5)2O – PubChem

Buhrmester, Claudia published the artcileStudies of Aromatic Redox Shuttle Additives for LiFePO₄-Based Li-Ion Cells, Category: ethers-buliding-blocks, the publication is Journal of the Electrochemical Society (2005), 152(12), A2390-A2399, database is CAplus.

Fifty eight aromatic organic mols. were screened as chem. shuttles to provide overcharge protection for LiFePO₄/graphite and LiFePO₄/Li_4/3Ti_5/3O₄ Li-ion cells. The majority of the mols. were based on methoxybenzene and on dimethoxybenzene with a variety of ligands added to explore their effect. The added ligands affect the redox potential of the mols. through their electron-withdrawing effect and affect the stability of the radical cation. Of all the mols. tested, only 2,5-di-tert-butyl-1,4-dimethoxybenzene shows an appropriate redox potential of 3.9 V vs. Li/Li⁺ and long-term stability during extended abusive overcharge totaling over 300 cycles of 100% overcharge per cycle. The reasons for the success of this mol. are explored.

Journal of the Electrochemical Society published new progress about 146370-51-6. 146370-51-6 belongs to ethers-buliding-blocks, auxiliary class Benzene,Ether, name is 1-((2-Ethylhexyl)oxy)-4-methoxybenzene, and the molecular formula is C15H24O2, Category: ethers-buliding-blocks.

Referemce:
https://en.wikipedia.org/wiki/Ether,
Ether | (C2H5)2O – PubChem

Peng, Kang-Yung published the artcileEfficient Light Harvesting by Sequential Energy Transfer across Aggregates in Polymers of Finite Conjugational Segments with Short Aliphatic Linkages, SDS of cas: 146370-51-6, the publication is Journal of the American Chemical Society (2001), 123(46), 11388-11397, database is CAplus and MEDLINE.

A series of light-harvesting polymers (poly-DSBs) of dialkyloxy- or dialkyl-substituted distyrylbenzene ( substituents = methoxy, 2-ethylhexyloxy, and cyclohexyl) with methylene or ethylene spacers were prepared The interactions between lumophores and the role of chem. structure of poly-DSBs on the absorption, emission, and excitation spectra were studied. The proximity of distyrylbenzene lumophores was critical to effective interactions and to the energy-transfer processes. In concentrated solutions and solid films, intermol. aggregates exist resulting from different extents of interactions between lumophores and involve at least three species: loose, compact, and aligned aggregates as observed by photoluminescence and excitation spectroscopy. Sequential energy transfer was directly observed from individual lumophores to the most compact, aligned aggregates via looser intermol. aggregates by time-resolved fluorescence spectroscopy. This process mimics energy transfer in photosynthesis and is highly efficient; fluorescence can be red-shifted drastically by the presence of comparatively few aggregates and light from concentrated solutions and films of poly-DSBs is entirely or almost due to aggregation emission. Although sequential energy-transfer in fully conjugated electro/photoluminescent polymers due to inhomogeneity other than distributed conjugation length has never been directly observed at room temperature, events similar to those observed in poly-DSBs could occur but on a much shorter time scale, i.e., a few picoseconds.

Journal of the American Chemical Society published new progress about 146370-51-6. 146370-51-6 belongs to ethers-buliding-blocks, auxiliary class Benzene,Ether, name is 1-((2-Ethylhexyl)oxy)-4-methoxybenzene, and the molecular formula is C15H24O2, SDS of cas: 146370-51-6.

Referemce:
https://en.wikipedia.org/wiki/Ether,
Ether | (C2H5)2O – PubChem