Tag: M.W=400-450

Sorensen, S. P. L. published the artcileA New Indicator, α-Naphtholphthalein, with Color Change near the Neutral Point, Name: 3,3-Bis(4-hydroxynaphthalen-1-yl)isobenzofuran-1(3H)-one, the publication is Biochemische Zeitschrift (1910), 381-6, database is CAplus.

The substance is made by the method of Grabowski (Ber., 4, 725). It shows a good color change at an H ion concentrate of 10^-7.26 to 10^-8.68. Proteins interfere with the end reaction.

Biochemische Zeitschrift published new progress about 596-01-0. 596-01-0 belongs to benzofurans, auxiliary class Benzofuran,Naphthalene,Alcohol,Ester, name is 3,3-Bis(4-hydroxynaphthalen-1-yl)isobenzofuran-1(3H)-one, and the molecular formula is C15H14N2, Name: 3,3-Bis(4-hydroxynaphthalen-1-yl)isobenzofuran-1(3H)-one.

Referemce:
https://en.wikipedia.org/wiki/Benzofuran,
Benzofuran | C8H6O – PubChem

Korenman, Ya. I. published the artcileTitrimetric determination of aromatic acids in nonaqueous concentrates, Application In Synthesis of 596-01-0, the publication is Journal of Analytical Chemistry (Translation of Zhurnal Analiticheskoi Khimii) (1998), 53(12), 1125-1130, database is CAplus.

The extraction of aromatic acids by hydrophilic solvents from aqueous solutions in the absence and the presence of salts was studied. Efficient extraction systems are proposed as media for nonaqueous titrations Procedures for the sep. titrimetric, potentiometric, conductometric, and photometric determination of aromatic acids in nonaqueous concentrates were developed.

Journal of Analytical Chemistry (Translation of Zhurnal Analiticheskoi Khimii) published new progress about 596-01-0. 596-01-0 belongs to benzofurans, auxiliary class Benzofuran,Naphthalene,Alcohol,Ester, name is 3,3-Bis(4-hydroxynaphthalen-1-yl)isobenzofuran-1(3H)-one, and the molecular formula is C28H18O4, Application In Synthesis of 596-01-0.

Referemce:
https://en.wikipedia.org/wiki/Benzofuran,
Benzofuran | C8H6O – PubChem

Hedvall, J. A. published the artcilePhotoadsorption effects in the system pigment-fluid phase, Recommanded Product: 3,3-Bis(4-hydroxynaphthalen-1-yl)isobenzofuran-1(3H)-one, the publication is Arkiv foer Kemi, Mineralogi och Geologi (1943), 17A(No. 11), 11 pp., database is CAplus.

The adsorption by red and black HgS of phenolphthalein from aqueous EtOH solution and by CdS of α-naphtholphthalein from similar solutions has been investigated under varying light conditions. Light has little effect on adsorption by black HgS but red HgS adsorbs six times as much phthalein in light as in darkness. This difference is ascribed to the different electronic structures of red and black HgS. Black HgS and irradiated red HgS are conductors, whereas in darkness red HgS is an insulator. CdS adsorbs phthalein much more when irradiated than in darkness. In each case adsorption in darkness is increased by presence of excess of S in the sulfide, A parallel is drawn between these photoadsorption effects and the Becquerel or photovoltaic effect.

Arkiv foer Kemi, Mineralogi och Geologi published new progress about 596-01-0. 596-01-0 belongs to benzofurans, auxiliary class Benzofuran,Naphthalene,Alcohol,Ester, name is 3,3-Bis(4-hydroxynaphthalen-1-yl)isobenzofuran-1(3H)-one, and the molecular formula is C28H18O4, Recommanded Product: 3,3-Bis(4-hydroxynaphthalen-1-yl)isobenzofuran-1(3H)-one.

Referemce:
https://en.wikipedia.org/wiki/Benzofuran,
Benzofuran | C8H6O – PubChem

Amao, Yutaka published the artcileAn optical sensor with the combination of colorimetric change of α-naphtholphthalein and internal reference luminescent dye for CO₂ in water, Computed Properties of 596-01-0, the publication is Sensors and Actuators, B: Chemical (2005), 107(2), 861-865, database is CAplus.

A new optical CO₂ sensor based on luminescence intensity changes of tetraphenylporphyrin (TPP) due to the absorption change of pH indicator dye (α-naphtholphthalein) with CO₂ is developed and its CO₂ sensing properties in pure H₂O were studied. The observed luminescence intensity from TPP at 650 nm increased with increasing the CO₂ concentration in pure H₂O. The ratio I₁₀₀/I₀, where I₀ and I₁₀₀ represent the detected luminescence intensities from a layer exposed to 100% Ar and 100% CO₂, resp., that the authors takes the sensitivity of the sensor is 430. The response times of the sensing film are 42.6 s for switching from Ar to CO₂, and 88.8 s for switching from CO₂ to Ar in pure H₂O. The signal changes are fully reversible and no hysteresis is observed during the measurements.

Sensors and Actuators, B: Chemical published new progress about 596-01-0. 596-01-0 belongs to benzofurans, auxiliary class Benzofuran,Naphthalene,Alcohol,Ester, name is 3,3-Bis(4-hydroxynaphthalen-1-yl)isobenzofuran-1(3H)-one, and the molecular formula is C28H18O4, Computed Properties of 596-01-0.

Referemce:
https://en.wikipedia.org/wiki/Benzofuran,
Benzofuran | C8H6O – PubChem

Amao, Yutaka published the artcileOptical CO₂ sensor with the combination of colorimetric change of α-naphtholphthalein and internal reference fluorescent porphyrin dye, Computed Properties of 596-01-0, the publication is Sensors and Actuators, B: Chemical (2004), 100(3), 347-351, database is CAplus.

A new optical CO₂ sensor based on the overlay of the CO₂ induced absorbance change of pH indicator dye α-naphtholphthalein with the fluorescence of tetraphenylporphyrin (TPP) was developed. The observed luminescence intensity from TPP at 655 nm increased with increasing the CO₂ concentration The ratio I₁₀₀/I₀ values of the sensing films consisting of α-naphtholphthalein in Et cellulose layer and TPP in polystyrene layer, where I₀ and I₁₀₀ represent the detected luminescence intensities from a layer exposed to 100% nitrogen and 100% CO₂, resp., that the sensitivity of the sensor, are >53.9. The response and recovery times of the sensing films consisting of α-naphtholphthalein in Et cellulose layer and TPP in polystyrene layer were <5 s for switching from nitrogen to CO₂, and for switching from CO₂ to nitrogen. The signal changes were fully reversible and no hysteresis was observed during the measurements. The highly sensitive optical CO₂ sensor based on fluorescence intensity changes of TPP due to the absorption change of α-naphtholphthalein with CO₂ was achieved.

Sensors and Actuators, B: Chemical published new progress about 596-01-0. 596-01-0 belongs to benzofurans, auxiliary class Benzofuran,Naphthalene,Alcohol,Ester, name is 3,3-Bis(4-hydroxynaphthalen-1-yl)isobenzofuran-1(3H)-one, and the molecular formula is C28H18O4, Computed Properties of 596-01-0.

Referemce:
https://en.wikipedia.org/wiki/Benzofuran,
Benzofuran | C8H6O – PubChem

Fernandez-Ramos, M. D. published the artcileOptical portable instrument for the determination of CO₂ in indoor environments, Recommanded Product: 3,3-Bis(4-hydroxynaphthalen-1-yl)isobenzofuran-1(3H)-one, the publication is Talanta (2020), 120387, database is CAplus and MEDLINE.

A portable device based on a colorimetric sensor to determine the atm. level of CO₂ gas is presented in this work. The system is based on a low-cost, low-power System on a Chip (SoC) microcontroller with integrated Wi-Fi. A user-friendly application was developed to monitor and log the CO₂ measurements when the system is connected to a Wi-Fi network. The sensing membrane is directly deposited on the surface of the color detector, thus reducing the complexity of the system. This sensing membrane is formed by a pH indicator α-naphtholphthalein, tetramethylammonium hydroxide pentahydrate, 1-ethyl-3-methylimidazolium tetrafluoroborate, Tween 20 and hydroxypropyl methylcellulose as the hydrophilic polymer. The system has been fully characterized, obtaining response and recovery times of 1.3 and 2.5 s, resp., a limit of detection of 51 ppm, and an average resolution of 6.3 ppm. This portable device was applied for the in-situ determination of CO₂ gas in the atm. inside classrooms in several secondary schools. The measurements were taken during complete workdays and the results were statistically compared with the same measurements taken using a com. available non-dispersive infra-red (NDIR) device. No significant statistical differences were found between the results obtained using both devices. A complete statistical treatment of the measurements made with the proposed portable device was carried out. The obtained results show that the concentration of CO₂ gas in some schools was higher than the desired concentration, with regard to influencing the student’s health, safety, productivity and comfort. This demonstrates the need to control this parameter to ensure appropriate indoor environmental quality (IEQ).

Talanta published new progress about 596-01-0. 596-01-0 belongs to benzofurans, auxiliary class Benzofuran,Naphthalene,Alcohol,Ester, name is 3,3-Bis(4-hydroxynaphthalen-1-yl)isobenzofuran-1(3H)-one, and the molecular formula is C28H18O4, Recommanded Product: 3,3-Bis(4-hydroxynaphthalen-1-yl)isobenzofuran-1(3H)-one.

Referemce:
https://en.wikipedia.org/wiki/Benzofuran,
Benzofuran | C8H6O – PubChem

Kruglyak, A. I. published the artcileBehavior of phthalein and sulfophthalein indicators in ethylenediamine-methanol solutions, SDS of cas: 596-01-0, the publication is Ukrainskii Khimicheskii Zhurnal (Russian Edition) (1986), 52(11), 1192-7, database is CAplus.

The behavior of phenol red, bromophenol red, bromophenol blue, thymol blue, phenolphthalein, thymolphthalein, α-naphtholphthalein, and erythrosine in H₂NCH₂CH₂NH₂ (I)-MeOH and Et₂NH-MeOH solutions was studied at 293 K by IR and visible spectrophotometry. The basicity of binary solvent mixtures was examined in relation to the ratio of the conjugated ionic indicator forms. Basicity at low concentrations of I is enhanced as a result of intermol. interactions with MeOH. Solvatochromic effects are also discussed.

Ukrainskii Khimicheskii Zhurnal (Russian Edition) published new progress about 596-01-0. 596-01-0 belongs to benzofurans, auxiliary class Benzofuran,Naphthalene,Alcohol,Ester, name is 3,3-Bis(4-hydroxynaphthalen-1-yl)isobenzofuran-1(3H)-one, and the molecular formula is C28H18O4, SDS of cas: 596-01-0.

Referemce:
https://en.wikipedia.org/wiki/Benzofuran,
Benzofuran | C8H6O – PubChem

Koganovskii, A. M. published the artcileAdsorption equilibrium in the system aqueous solution of nonionic surfactant-solubilized α-naphtholphthalein on acetylene black, Name: 3,3-Bis(4-hydroxynaphthalen-1-yl)isobenzofuran-1(3H)-one, the publication is Kolloidnyi Zhurnal (1974), 36(5), 861-4, database is CAplus.

The adsorption isotherms of α-naphtholphthalein (I) on acetylene black from I solutions containing surfactants (II) were obtained. The initially H2O-insoluble I was solubilized by the aqueous micellar solutions of II, the oxyethylated monoethers of decyl and dodecyl alcs. containing 17 and 23 oxyethylene groups. The I concentration in the adsorbed layer exceeded the concentration corresponding to II solubilization capacity. A mechanism for adsorption of solubilized organic dyes from micellar solutions of II is proposed.

Kolloidnyi Zhurnal published new progress about 596-01-0. 596-01-0 belongs to benzofurans, auxiliary class Benzofuran,Naphthalene,Alcohol,Ester, name is 3,3-Bis(4-hydroxynaphthalen-1-yl)isobenzofuran-1(3H)-one, and the molecular formula is C28H18O4, Name: 3,3-Bis(4-hydroxynaphthalen-1-yl)isobenzofuran-1(3H)-one.

Referemce:
https://en.wikipedia.org/wiki/Benzofuran,
Benzofuran | C8H6O – PubChem

Halamek, Emil published the artcileExtraction photometric determination of yperite by phthaleins, Recommanded Product: 3,3-Bis(4-hydroxynaphthalen-1-yl)isobenzofuran-1(3H)-one, the publication is Talanta (1999), 48(1), 163-171, database is CAplus and MEDLINE.

Extraction spectrophotometric determination of sulfidic yperite, based on the reaction with 4 phthaleins, was developed. The method is tech. simpler than determining yperites with reagent T-135 (alk.-aqueous ethanolic thymol phthalein solution) because it does not require heating at 80°, cooling, and acidifying the reaction mixture Selecting the appropriate phthalein, especially optimizing the reagent composition and extracting the colored reaction product in chloroform, markedly increased the selectivity of the determination of yperites (HD, HN-3). The reaction is performed in a medium of increased polarity due to the low alc. content which enables the reaction to proceed at 5-20° without any marked loss of sensitivity. Using ¹H and ¹³C NMR spectroscopy, the reaction products of HD and o-cresol phthalein were identified and an ionic mechanism for the reaction of HD with phthaleins is suggested.

Talanta published new progress about 596-01-0. 596-01-0 belongs to benzofurans, auxiliary class Benzofuran,Naphthalene,Alcohol,Ester, name is 3,3-Bis(4-hydroxynaphthalen-1-yl)isobenzofuran-1(3H)-one, and the molecular formula is C28H18O4, Recommanded Product: 3,3-Bis(4-hydroxynaphthalen-1-yl)isobenzofuran-1(3H)-one.

Referemce:
https://en.wikipedia.org/wiki/Benzofuran,
Benzofuran | C8H6O – PubChem

Amao, Yukata published the artcileNovel optical CO₂ sensing material: pH indicator immobilized in fluorine-containing poly(aryl ether ketone) films, Recommanded Product: 3,3-Bis(4-hydroxynaphthalen-1-yl)isobenzofuran-1(3H)-one, the publication is Sensor Letters (2005), 3(2), 168-173, database is CAplus.

New F-containing poly(aryl ether ketone)s (8F-PEKEK(Ar); Ar: 2-2-bis(4-hydroxyphenyl)-1,1,1,3,3,3-hexafluoropropane (6FBA), 2,2-bis(4-hydroxyphenyl)propane (BA), 2-(4-hydroxyphenyl)-2-(3-hydroxyphenyl)propane (3,4′-BA) or 9,9′-bis(4-hydroxyphenyl)fluorine (HF)) were synthesized and applied to the matrix of optical CO₂ sensor based on the overlay of the CO₂ induced absorbance change of pH indicator dye α-naphtholphthalein with the fluorescence of tetraphenylporphyrin (TPP) was developed. The observed luminescence intensity from TPP at 655 nm increased with increasing the CO₂ concentration The ratio I₁₀₀/I₀ values of the sensing films consisting of α-naphtholphthalein in 8F-PEKEKs layer and TPP in polystyrene layer, where I₀ and I₁₀₀ represent the detected luminescence intensities from a layer exposed to 100% Ar and 100% CO₂, resp., that the sensitivity of the sensor, are >3.6. The response and recovery times of the sensing films consisting of α-naphtholphthalein in 8F-PEKEKs layer and TPP in polystyrene layer were <8.6 s for switching from Ar to CO₂, and for switching from CO₂ to Ar. The signal changes were fully reversible and no hysteresis was observed during the measurements. The highly sensitive and fast responsible optical CO₂ sensor based on fluorescence intensity changes of TPP due to the absorption change of α-naphtholphthalein in 8F-PEKEKs layer with CO₂ was achieved.

Sensor Letters published new progress about 596-01-0. 596-01-0 belongs to benzofurans, auxiliary class Benzofuran,Naphthalene,Alcohol,Ester, name is 3,3-Bis(4-hydroxynaphthalen-1-yl)isobenzofuran-1(3H)-one, and the molecular formula is C28H18O4, Recommanded Product: 3,3-Bis(4-hydroxynaphthalen-1-yl)isobenzofuran-1(3H)-one.

Referemce:
https://en.wikipedia.org/wiki/Benzofuran,
Benzofuran | C8H6O – PubChem