Tag: M.W=200-250

Jo, Tae Geun published the artcileA single fluorescent chemosensor for multiple targets of Cu²⁺, Fe^2+/3+ and Al³⁺ in living cells and a near-perfect aqueous solution, SDS of cas: 116-63-2, the publication is RSC Advances (2017), 7(46), 28723-28732, database is CAplus.

A sulfonate-based chemosensor 1 was designed and synthesized for sensing various analytes: Cu²⁺, Fe^2+/3+ and Al³⁺. Sensor 1 showed a high selectivity and sensitivity for the analytes in a near-perfect aqueous medium. Cu²⁺ and Fe^2+/3+ could be monitored by fluorescence quenching of 1. It had sufficiently low detection limits (1.25 μM for Cu²⁺ and 3.96 μM for Fe³⁺), which were below the recommended levels of the World Health Organization for Cu²⁺ (31.5 μM) and the Environmental Protection Agency for Fe³⁺ (5.37 μM). 1 showed the high preferential selectivity for Cu²⁺ and Fe³⁺ in the presence of competitive metal ions without any interference. Importantly, pyrophosphate could be used to distinguish Fe³⁺ from Cu²⁺. In addition, this sensor could monitor Al³⁺ through fluorescence emission change. Moreover, 1 was successfully applied to quantify and image Al³⁺ in water samples and living cells. Based on photophys. studies and theor. calculations, the sensing mechanisms of 1 for Cu²⁺ and Al³⁺ were explained, resp.

RSC Advances 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, SDS of cas: 116-63-2.

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

Shariati-Rad, Masoud published the artcileQuantitation of trace amounts of nitrite in water samples using 4-amino-3-hydroxynaphthalene-1-sulfonic acid and central composite design, Recommanded Product: 4-Amino-3-hydroxynaphthalene-1-sulfonic acid, the publication is Analytical Chemistry: An Indian Journal (2015), 15(10), 421-428, database is CAplus.

A simple, selective and very sensitive method for the spectrophotometric determination of nitrite in water has been developed and optimum reaction conditions along with other anal. parameters have been evaluated. Optimum conditions of the factors influencing the reaction were explored by central composite design (CCD). The variables chosen were pH of the acidic solution and volume of 4-amino-3-hydroxynaphthalene-1-sulfonic acid. The method is based on the reaction of nitrite with 4-amino-3-hydroxynaphthalene-1-sulfonic acid. The absorbance of the product at 303 nm obeyed Beer’s law in the concentration range of 0.001-0.200 mg L-1 of nitrite. A detection limit of 5 × 10-4 mg L-1 was obtained for the determination of nitrite by the proposed method. The method was successfully applied to determine nitrite in water sample. The RSD of the method for determination of nitrite in water samples was 6%. The method is capable in determination of trace amounts of nitrite in water samples.

Analytical Chemistry: An Indian Journal 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 C7H16ClNO2, Recommanded Product: 4-Amino-3-hydroxynaphthalene-1-sulfonic acid.

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

Rouille, G. published the artcilePolyynyl-Substituted PAH Molecules and DIB Carriers, Application of 9,10-Diethynylanthracene, the publication is Proceedings of the International Astronomical Union (2013), 9(S297), 276-280, database is CAplus.

Polycyclic aromatic hydrocarbon (PAH) mols. have been long considered promising candidates for the carriers of the diffuse interstellar bands (DIBs). The PAH-DIB hypothesis, however, raises two major issues. First, the number of interstellar PAH species is potentially orders of magnitude larger than the number of DIBs. Second, the absorption spectrum of a PAH is in general dominated by bands found at UV wavelengths while, conversely, DIBs are absent from the UV wavelength domain and arise at visible and near IR wavelengths. These issues do not necessarily weaken the PAH-DIB hypothesis and can actually allow us to refine it. In that context, we analyze the UV/vis absorption spectra of PAH mols. isolated in Ne matrixes and propose that polyynyl-substituted PAHs, or similar species, are valid candidates for the carriers of the DIBs. Finally, a possible lifecycle for DIB-carrying PAHs is presented.

Proceedings of the International Astronomical Union 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, Application of 9,10-Diethynylanthracene.

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

Fabre, Muriel A. published the artcileSynthesis of novel mononuclear and dinuclear ruthenium(II) complexes with terpyridine and acetylacetonate ancillary ligands and cyanamide derivative ligands, Application In Synthesis of 18512-55-5, the publication is Inorganica Chimica Acta (2005), 358(7), 2384-2394, database is CAplus.

Several new mononuclear and dinuclear Ru(II) complexes incorporating 2,2′:6′,2”-terpyridine and acetylacetonate as ancillary ligands and phenylcyanamide derivative ligands [Ru(tpy)(acac)(L)] and [{Ru(tpy)(acac)}₂(μ-L’)] (tpy = 2,2′:6′,2”-terpyridine, acac = acetylacetonate, L = hmbpcyd = 4-(3-hydroxy-3-methylbutynyl)phenylcyanamide anion (2) and epcyd = 4-ethynylphenylcyanamide anion (3) and L’ = bcpda = bis(4-cyanamidophenyl)diacetylene dianion (4) and bcpea = 9,10-bis(4-cyanamidophenylethynyl)anthracene dianion (5)) were synthesized in a stepwise manner starting from [Ru(tpy)(acac)(Ipcyd)] (1), where Ipcyd = 4-iodophenylcyanamide anion. Ph₄As⁺ salts of the phenylcyanamide derivative ligands were also prepared The four complexes were characterized by UV-visible, IR, ES-MS, electrochem. and ¹H NMR. Mononuclear complexes 2 and 3 were further characterized by ¹³C NMR. The single crystal x-ray structure of 2 was determined, it crystallized with one mol. of H₂O with empirical formula of C₃₂H₃₁N₅O₅Ru, in a monoclinic crystal system and space group of P2₁/n with a 17.642(5), b 9.634(2), c 20.063(7) Å, β 92.65(3)° and Z = 4. The structure was refined to a final R factor of 0.040. The Ru(III/II) couple of 1–3 appeared around 0.34 V vs. the SCE in DMF and at a slightly higher potential, around 0.36-0.37 V for 4 and 5. Spectroelectrochem. studies were also performed for 4 and 5, no intervalence transition was observed despite all attempts.

Inorganica Chimica Acta 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, Application In Synthesis of 18512-55-5.

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

Ou, Ya-Ping published the artcileSynthesis, Characterization, and Properties of Anthracene-Bridged Bimetallic Ruthenium Vinyl Complexes [RuCl(CO)(PMe₃)₃]₂(μ-CH:CH-anthracene-CH:CH), Name: 9,10-Diethynylanthracene, the publication is Organometallics (2011), 30(21), 5763-5770, database is CAplus.

Four anthracene-based bimetallic Ru vinyl complexes, in which two Ru units are attached at different positions (the 9,10-, 1,5-, 2,6-, and 1,8-positions) of the anthracene moiety, were synthesized by treating the appropriate anthracene-based ethynes with [RuHCl(CO)(PPh₃)₃]. These bimetallic complexes were thoroughly characterized by NMR, x-ray diffraction, and elemental anal. According to the single-crystal x-ray structures, the 2,6-disubstituted Ru vinyl complex has a more planar structure compared with the 9,10-disubstituted complex, possibly because it has less steric hindrance. Also, the optical electronic properties of these complexes were studied, such as their UV/visible absorption spectra, fluorescence spectra, and electrochem. properties. The optical electronic results indicated that the 2,6-disubstituted Ru vinyl complex displayed the strongest fluorescence emission due to the more planar structure of its organic conjugated bridge, and the electrochem. studies showed that the two Ru centers displayed obvious differences in electronic communication when they are located at different positions on the anthracene unit, with the 9,10- and 1,8-disubstituted Ru vinyl complexes exhibiting better electronic communication and higher stability of the mixed-valence complex than the 1,5- and 2,6-disubstituted complexes.

Organometallics 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

Cao, Gui-Ping published the artcileRapid and environmentally friendly determination of trace nitrite in water under combined effects of cetyltrimethyl ammonium bromide and β-cyclodextrin, Category: naphthyridine, the publication is Desalination and Water Treatment (2019), 259-267, database is CAplus.

Nitrite is a characteristic pollutant in natural water. A simple, rapid and highly selective spectrofluorimetric method for determination of trace nitrite has been developed. It was based on the fact that nitrite reacted rapidly with iodide at room temperature and led to the fluorescence quenching of 4′,5′-dibromofluorescein (DBF) under the combined effects of cetyltrimethyl ammonium bromide (CTAB) and β-cyclodextrin (β-CD). The fluorescence intensity of the above reaction system was measured with excitation and emission wavelengths of 532 and 551 nm, resp. Optimal values of the main factors involving volumes of CTAB, β-CD and sulfuric acid were explored by a Box-Behnken design. Under the optimized exptl. conditions, the fluorescence quenching intensity was good linear over a nitrite concentration range of 0.2-46.0μg/L with a correlation coefficient better than 0.998. The detection limit of 0.16μg/L was obtained for the determination of nitrite by the proposed method. The general coexisting ions did not interfere to the reactions of nitrite with iodide and DBF. The relative standard deviation of the method for the determination of nitrite in water samples was below 2.7%, and the corresponding recoveries were between 92.1% and 107.9%. The proposed method is environmentally friendly and suitable for water monitoring.

Desalination and Water Treatment 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, Category: naphthyridine.

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

Kobayashi, Eiichi published the artcileNovel conjugated polymer containing anthracene backbone: addition polymers of 1,4-benzenedithiol with 9,10-diethynylanthracene and its conductivity, Formula: C18H10, the publication is Polymer Journal (Tokyo, Japan) (1990), 22(3), 266-73, database is CAplus.

The addition polymerization of 1,4-benzenedithiol to 9,10-diethynylanthracene, which was freshly prepared before use, was carried out in a THF and benzene solution at 50-60° under N atm. by various initiation methods such as UV irradiation, AIBN, and Bz₂O₂. The yield of polymer was affected seriously by the initiation mode. Both the yield and the mol. weight are higher for the polymer prepared by UV irradiation than that prepared by means of AIBN or Bz₂O₂. By UV irradiation, the yield of the polymer was âˆ?0%, and the number-average mol. weight of the polymer obtained in THF was âˆ?0,000, which was one order higher than that of the polymer obtained in benzene. The elec. conductivity of the polymer was on the order of 10^-13 Scm^-1 without doping, but increased up to 10^-6 Scm^-1 on I₂ doping. The diffuse reflectance spectra of the polymer indicated a relatively lower band gap (âˆ?.77 eV), and at 1.46 eV and 0.86 eV small peaks appeared, which could be attributed to a polaron or bipolaron in the polymer backbone.

Polymer Journal (Tokyo, Japan) 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, Formula: C18H10.

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

Kobayashi, Eiichi published the artcileNovel conjugated polymer containing anthracene backbone: competitive addition polymerization of dithiol monomers to diethynyl monomers and relative reactivity, SDS of cas: 18512-55-5, the publication is Polymer Journal (Tokyo, Japan) (1990), 22(2), 146-52, database is CAplus.

Competitive addition polymerizations of 9,10-anthracenedithiol (I), 4,4′-biphenyl-dithiol(II), and 1,4-benzenedithiol (III) to 9,10-diethynylanthracene (IV), 4,4′-diethynylbiphenyl (V), and 1,4-diethynylbenzene (VI) were carried out in THF at 50° by UV irradiation under a nitrogen atm., and the relative reactivities of the monomers were discussed on the basis of composition anal. for the obtained polymers. To the dithiol monomers, the relative reactivities of the diethynyl monomers were in the order of IV > V > VI. The relative reactivities of dithiol monomers to the diethynyl monomers were in the order of I > II > III. This indicated that the more the monomer conjugation, the higher was the relative reactivity. The high reactivities of anthracene derivatives would be caused from stabilization of the intermediate carbon radical and thio radical by its high conjugation system.

Polymer Journal (Tokyo, Japan) 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

Kobayashi, Eiichi published the artcileNovel conjugated polymer containing anthracene backbone: addition polymer of 9,10-diethynylanthracene with 9,10-anthracenedithiol and its properties, HPLC of Formula: 18512-55-5, the publication is Journal of Polymer Science, Part A: Polymer Chemistry (1990), 28(10), 2641-50, database is CAplus.

9,10-Diethynylanthracene (I) was prepared by alk. hydrolysis of 9,10-bis(trimethylsilylethynyl)anthracene. Another monomer, 9,10-anthracenedithiol (II), was prepared by reduction of anthracene polydisulfide. A crystalline conjugated polymer (III) of I with II was synthesized in a THF solution at 50° by UV irradiation or using radical initiators. The number-average mol. weight of the insoluble III in THF was about 20000-30000 and the soluble was about 4000. Based on the S content and IR spectrum of the insoluble III, the obtained III had an alternating structure consisting of I and II units. X-ray patterns indicate that the polymer has a layered structure. The conductivity of undoped III was 10^-11 S/cm, but increased to 10^-6 S/cm by doping with iodine.

Journal of Polymer Science, Part A: Polymer 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, HPLC of Formula: 18512-55-5.

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