Tag: M.W=200-250

Bhattacharyya, Kalishankar published the artcilePolymorphism Controlled Singlet Fission in TIPS-Anthracene: Role of Stacking Orientation, Name: 9,10-Diethynylanthracene, the publication is Journal of Physical Chemistry C (2017), 121(3), 1412-1420, database is CAplus.

Generation of multiple triplet excitons from one singlet exciton (singlet fission, SF) has been reported in several organic mols. recently. The overall SF yield in such mol. materials, however, is controlled by polymorphism in organic semiconductors through noncovalent interactions like van der Waals and weak electrostatic interactions. In this article, we demonstrate how SF is strongly perturbed by even small variations in mol. packing for polymorphic crystals of triisopropylsilyethnyl-anthracene derivatives, TIPS-Ant (PI and PII). Based on quantum chem. calculations, SF dynamics have been computed for both PI and PII polymorphs. PI and PII differ in their intermol. π···π stacking patterns, which eventually control their electronic properties. Using the incoherent hopping model for the crystals, we computed SF rate through the Marcus electron transfer theory. For both PI and PII, the direct two-electron pathway predominates over the charge-transfer (CT) mediated mechanism. PII has higher triplet yield (âˆ?96%) compared to PI (âˆ?78%). Both time-dependent DFT as well as Weller equation reveal that the charge transfer (CT) state is a high energy state, and hence, CT mediated SF barely influences triplet yield. Interplay of the local excitation (LE), multiple excitation (ME), and correlated triplet (T₁T₁) energy levels controlled the overall exciton dynamics/diffusion in TIPS-Ant polymorphs. Polymorphism is shown to be a key factor for the rational design of optimal SF in polyaromatic hydrocarbons (PAH).

Journal of Physical Chemistry C published new progress about 18512-55-5. 18512-55-5 belongs to naphthyridine, auxiliary class Alkynyl,Anthracene, name is 9,10-Diethynylanthracene, and the molecular formula is C18H10, Name: 9,10-Diethynylanthracene.

Referemce:
https://en.wikipedia.org/wiki/1,8-Naphthyridine,
1,8-Naphthyridine | C8H6N2 – PubChem

Bruce, Michael I. published the artcileSome platinum(II) complexes derived from aromatic alkynes, SDS of cas: 18512-55-5, the publication is Applied Organometallic Chemistry (2002), 16(10), 559-568, database is CAplus.

Several trans-platinum(II) complexes, of the type {trans-RPt(PBu₃)₂}-Q-{trans-Pt(PR₃)₂R}, where R and Q are groups derived from a series of aromatic alkynes and diynes, were prepared and characterized. Platination of trans-[(4-R¹-2,5-R²₂-C₆H₂CC)₂PtL₂] (L = PBu₃ or PTol₃; R² = H or OMe; R¹ = HCC) with trans-L₂PtCl₂ afforded trans-[ClPtL₂(CCC₆H₂-2,5-R²₂-4-CC)PtL₂(CCC₆H₂-2,5-R²₂-4-CC)PtL₂Cl], which were alkynylated by 4-(R³CC)(C₆H₂-2,5-R²₂)CCH (R³ = H, Ph) to give trinuclear bis-alkynylated platinum rod-like complexes. The same reaction of 1,4-diethynylarenes with subsequent alkynylation gave analogous binuclear complexes. Similar reaction led to trinuclear [trans-PtCl(PBu₃)(CCC₆H₄-4-CCPh)]₃[1,3,5-(CC)C₆H₃] complex. Coupling of trans-[(4-HCCC₆H₄CC)₂Pt(PBu₃)₂] with 4-IC₆H₄X (X = I, OH, NH₂, NO₂) gave corresponding trans-[(4-XC₆H₄CCC₆H₄CC)₂Pt(PBu₃)₂]. Spectroscopic data for these and other known related complexes are presented. A more precise structural study of trans-Pt(CCC₆H₄CCPh)₂(PBu₃)₂ is reported.

Applied Organometallic Chemistry published new progress about 18512-55-5. 18512-55-5 belongs to naphthyridine, auxiliary class Alkynyl,Anthracene, name is 9,10-Diethynylanthracene, and the molecular formula is C18H10, SDS of cas: 18512-55-5.

Referemce:
https://en.wikipedia.org/wiki/1,8-Naphthyridine,
1,8-Naphthyridine | C8H6N2 – PubChem

Zhong, Yao published the artcileSulfonic acid functionalized hydrophobic mesoporous biochar: Design, preparation and acid-catalytic properties, Related Products of naphthyridine, the publication is Fuel (2019), 270-277, database is CAplus.

Sulfonic acid functional strong acidic catalysts are largely used in various chem. reactions. However, in many reactions with water as product, the catalytic activity and selectivity are unsatisfactory, because hydrophilic acid sites of SO₃H would suffer from acidity decreasing and some hydrolysis side reactions would occur via water adsorption. Herein, a novel hydrophobic arenesulfonic acid functionalized biochar was successfully prepared for the first time by one-pot diazo reduction method of biochar with amino-arenesulfonic acid (such as, 4-aminbenzenesulfonic acid, 4-amino-1-naphthalenesulfonic acid, 8-amino-1-naphthalenesulfonic acid, 4-amino-3-hydroxy-1-naphthalenesulfonic acid). It has a large sp. surface area of 200-400 m²/g, a hydrophobic network with water contact angle higher than 120° and a higher concentration of sulfonic acid over 1.0 mmol/g. Moreover, the hydrophobicity-oleophilicity and acidity are increased with the arene length and grafting amount of arenesulfonic acid. In the esterification reaction of fatty acid with methanol as well as the transesterification reaction of glycerol trioleate with methanol for the production of biodiesel, the sulfonated biochar shows a higher conversion of 96.7% for esterification and 86.3% for transesterification compared with amberlyst-15 (86.7%, 39.9%) and traditional sulfonation biochar-SO₃H (27.4%, 32.6%). In the alkylation reaction of 2-methylfuran with cyclopentanone for the production of high-d. biofuel, its catalytic efficiency with target product yield of 76.1% is higher than that of amberlyst-15 (50.2%) and traditional sulfonation biochar-SO₃H (13.2%), because of its hydrophobicity and strong acidity. Furthermore, the catalyst is stable and shows an excellent cycle performance after 6 runs. The successful preparation of hydrophobic biochar-based acidic catalysts not only provides a new way for high-value utilization of biochar, but also eliminates the neg. effect of water on many catalytic reactions.

Fuel published new progress about 116-63-2. 116-63-2 belongs to naphthyridine, auxiliary class Sulfonic acid,Amine,Naphthalene,Alcohol,Organic Pigment, name is 4-Amino-3-hydroxynaphthalene-1-sulfonic acid, and the molecular formula is C8H9NOS, Related Products of naphthyridine.

Referemce:
https://en.wikipedia.org/wiki/1,8-Naphthyridine,
1,8-Naphthyridine | C8H6N2 – PubChem

Yamashita, Hiroshi published the artcileFacile palladium-catalyzed hydrogermylation polymerization of a dihydrogermane with diynes affording light-emissive germylene-divinylene polymers, Formula: C18H10, the publication is Chemistry Letters (2006), 35(4), 398-399, database is CAplus.

Hydrogermylation polymerization of diphenylgermane with aliphatic and aromatic diynes smoothly proceeded in the presence of Pd-PCy₃ (Cy = cyclohexyl) catalysts to give new germylene-divinylene polymers in high yields.

Chemistry Letters published new progress about 18512-55-5. 18512-55-5 belongs to naphthyridine, auxiliary class Alkynyl,Anthracene, name is 9,10-Diethynylanthracene, and the molecular formula is C13H13BO2S, Formula: C18H10.

Referemce:
https://en.wikipedia.org/wiki/1,8-Naphthyridine,
1,8-Naphthyridine | C8H6N2 – PubChem

Wu, Cheng-Hua published the artcilePorphyrins for efficient dye-sensitized solar cells covering the near-IR region, Recommanded Product: 9,10-Diethynylanthracene, the publication is Journal of Materials Chemistry A: Materials for Energy and Sustainability (2014), 2(4), 991-999, database is CAplus.

New porphyrins (LWP1-4) for dye-sensitized solar cells (DSSCs) were prepared by attaching pyrene or a 4-dimethylaminophenyl group in combination with anthracene to modify the porphyrin core. Fundamental studies showed that incorporation of these moieties renders feasible tuning of spectral and redox properties of the porphyrins. Significantly, DSSCs adopting the LWP1 dye exhibit energy conversion up to 800 nm without compromising the overall efficiency. This achievement is attributed to the collective effects of the broadened and red shifted IPCE spectra, elevated energy levels at the excited states of the dyes, suitable dye soaking processes, and suitable electron-donating substituents.

Journal of Materials Chemistry A: Materials for Energy and Sustainability published new progress about 18512-55-5. 18512-55-5 belongs to naphthyridine, auxiliary class Alkynyl,Anthracene, name is 9,10-Diethynylanthracene, and the molecular formula is C16H12O, Recommanded Product: 9,10-Diethynylanthracene.

Referemce:
https://en.wikipedia.org/wiki/1,8-Naphthyridine,
1,8-Naphthyridine | C8H6N2 – PubChem

Liu, Huanhuan published the artcileRelationship of mineralization of amino naphthalene sulfonic acids by Fenton oxidation and frontier molecular orbital energies, Recommanded Product: 4-Amino-3-hydroxynaphthalene-1-sulfonic acid, the publication is Chemical Engineering Journal (Amsterdam, Netherlands) (2014), 275-282, database is CAplus.

Six amino naphthalene sulfonic acids including mono-, di- and tri-sulfonic acid compounds were studied to find the relationship between the reactivity of this kind of compounds in Fenton oxidation process and energies of the frontier MO. It was found that the initial rates of TOC reduction and oxalic acid production correlated strongly to the frontier MO energies and can be estimated by E_HOMO and the absolute electronegativity (χ). The cleavage of -SO₃H and -NH₂ groups to produce SO^2-₄ and NH⁺₄ species was dependent on the electron d. distribution on the -SO₃H moiety and the α-carbon atom connecting the -NH₂ moiety. The electron withdrawing effect of the -SO₃H groups influenced the mineralization of naphthalene sulfonic acids significantly. The naphthalene sulfonic acid with more -SO₃H groups was more recalcitrant to the Fenton oxidation

Chemical Engineering Journal (Amsterdam, Netherlands) published new progress about 116-63-2. 116-63-2 belongs to naphthyridine, auxiliary class Sulfonic acid,Amine,Naphthalene,Alcohol,Organic Pigment, name is 4-Amino-3-hydroxynaphthalene-1-sulfonic acid, and the molecular formula is C10H9NO4S, Recommanded Product: 4-Amino-3-hydroxynaphthalene-1-sulfonic acid.

Referemce:
https://en.wikipedia.org/wiki/1,8-Naphthyridine,
1,8-Naphthyridine | C8H6N2 – PubChem

Skowronski, Romuald published the artcileBenzenic and anthracenic hydrocarbons with unsaturated side chains, HPLC of Formula: 18512-55-5, the publication is Bulletin de la Societe Chimique de France (1967), 4235-43, database is CAplus.

Benzenic and anthracenic hydrocarbons having unsaturated side chains are obtained by aromatization of the corresponding dihydroaromatic diquinols in the presence of SnCl2 in MeOH or tetrahydrofuran at ambient temperature [TABLE OMITTED] In the case of polyacetylenic diols, the acetylenic diols are reacted with a 1-bromoacetylenic compound in the presence of MeOH, EtNH2, and CuCl. Condensation of ketones with alkynylarenes in the presence of KOH in tetrahydrofuran or N-methylpyrrolidone leads to the formation of acetylenic alcs. or diols. SnCl2/AcCl reduction of the diols in tetrahydrofuran furnishes quinoid biscumulenes, while catalytic partial reduction with Pd/CaCO3 in tetrahydrofuran or chem. partial reduction with LiAlH4 in tetrahydrofuran yields cis, cis diethylenic diols and trans, trans diethylenic diols, resp. The compounds prepared are given in the table.

Bulletin de la Societe Chimique de France published new progress about 18512-55-5. 18512-55-5 belongs to naphthyridine, auxiliary class Alkynyl,Anthracene, name is 9,10-Diethynylanthracene, and the molecular formula is C11H7ClFNO3, HPLC of Formula: 18512-55-5.

Referemce:
https://en.wikipedia.org/wiki/1,8-Naphthyridine,
1,8-Naphthyridine | C8H6N2 – PubChem

Deka, Manash Jyoti published the artcileCVD Assisted Hydrophobic Graphene Quantum Dots: Fluorescence Sensor for Aromatic Amino Acids, Computed Properties of 116-63-2, the publication is ChemistrySelect (2017), 2(5), 1999-2005, database is CAplus.

In this paper, an hydrophobic graphene quantum dots(h-GQDs) based PL sensor was demonstrated which can distinguish between aromatic and non-aromatic amino acids. The h-GQDSs prepared using Chem. Vapor Deposition method from acetylene gas and hydrogen gas was used as cocatalyst. The characterization of h-GQDs was carried out by UV-Visible absorption spectrophotometer, Dynamic Light Scattering, SEM, Fourier Transform IR Spectrophotometer, Raman spectroscopy. These CVD assisted h-GQDs form stable dispersion in organic solvents and are hydrophobic in nature. It was observed that photoluminescence (PL) intensity of h-GQDs systems in the presence of aromatic amino acids is enhanced due to electron transfer from aromatic amino acids to h-GQDs whereas with non-aromatic amino acids PL intensity is quenched. Hence h-GQDs systems can selectively distinguish between aromatic and non-aromatic amino acid. The mechanistic insight is also discussed in the paper. Besides fluorescence sensors for aromatic amino acids, the h-GQDs system can also be used as a fluorescence hydrophobic coating material as when coated on glass substrate it shows very high contact angle (107°).

ChemistrySelect published new progress about 116-63-2. 116-63-2 belongs to naphthyridine, auxiliary class Sulfonic acid,Amine,Naphthalene,Alcohol,Organic Pigment, name is 4-Amino-3-hydroxynaphthalene-1-sulfonic acid, and the molecular formula is C10H9NO4S, Computed Properties of 116-63-2.

Referemce:
https://en.wikipedia.org/wiki/1,8-Naphthyridine,
1,8-Naphthyridine | C8H6N2 – PubChem

Deka, Manash Jyoti published the artcileTuning Electrical Properties of Graphene with Different π-Stacking Organic Molecules, Quality Control of 116-63-2, the publication is Journal of Physical Chemistry C (2016), 120(7), 4121-4129, database is CAplus.

Tuning of the elec. properties of graphene and functionalized graphene is very important to its use in optoelectronic devices. In this work, we study the elec. properties of graphene and graphene with different π-stacking organic mols. The different π-stacking organic mols. used in the present study were hemin, 1-amino 2-naphthol 4-sulfonic acid, and ferrocene. The noncovalently functionalized reduced graphene oxides were characterized by UV-visible spectroscopy, Fourier transformed IR spectroscopy, at. force microscopy, SEM, thermogravimetric anal., and Raman spectroscopy. The noncovalently functionalized reduced graphene oxide show higher ac conductivity than graphene oxide (GO). The enhancement of conductivity shown can be attributed to higher mobility, and the d. of π-electron and higher surface area of hybrid nanocomposites system. The reason is supported because that interaction of rGO with non-π-system like 18-crown-6 did not help in increasing the ac conductivity of the system. Thus, the elec. properties of graphene can be tuned through noncovalent interaction with π-stacking organic mols.

Journal of Physical Chemistry C published new progress about 116-63-2. 116-63-2 belongs to naphthyridine, auxiliary class Sulfonic acid,Amine,Naphthalene,Alcohol,Organic Pigment, name is 4-Amino-3-hydroxynaphthalene-1-sulfonic acid, and the molecular formula is C10H9NO4S, Quality Control of 116-63-2.

Referemce:
https://en.wikipedia.org/wiki/1,8-Naphthyridine,
1,8-Naphthyridine | C8H6N2 – PubChem

Manivannan, Dhanasekaran published the artcileSynthesis and chelation properties of a new polymeric ligand derived from 1-amino-2-naphthol-4-sulfonic acid, Product Details of C10H9NO4S, the publication is Journal of AOAC International (2015), 98(1), 188-191, database is CAplus and MEDLINE.

A novel chelating resin for preconcentration of heavy metals from various seawater samples has been developed by condensing 1-amino-2-hydroxy-7-[(4-hydroxyphenyl)diazenyl] naphthalene-4-sulfonic acid (AHDNS) with formaldehyde (1:2 mol ratio) in the presence of oxalic acid as the catalyst. The resin obtained was used as a solid sorbent for the separation of divalent metal ions present at trace levels in seawater. The functionalized phenol (AHDNS) was characterized by spectral studies. The polymeric resin AHDNS-formaldehyde (AHDNS-F) obtained by condensing the functionalized phenol and formaldehyde was characterized by IR and NMR spectral studies. The chelating property of the AHDNS-F resin towards divalent metal ions was studied as a function of pH and in the presence of electrolyte. The metal uptake properties of the resin were determined by using an at. absorption spectrophotometer. This procedure was validated for recovery of divalent metal ions from seawater samples. The recovery of cadmium, cobalt, copper, manganese, lead, and zinc were above 92% under the optimum preconcentration conditions. The LOD was <0.73 μg/L and the RSDs were <2%. Thus, the AHDNS-F resin can be widely used as a solid sorbent for the preconcentration of trace metals at ppm levels in seawater samples.

Journal of AOAC International published new progress about 116-63-2. 116-63-2 belongs to naphthyridine, auxiliary class Sulfonic acid,Amine,Naphthalene,Alcohol,Organic Pigment, name is 4-Amino-3-hydroxynaphthalene-1-sulfonic acid, and the molecular formula is C10H9NO4S, Product Details of C10H9NO4S.

Referemce:
https://en.wikipedia.org/wiki/1,8-Naphthyridine,
1,8-Naphthyridine | C8H6N2 – PubChem