Month: December 2022

Szyfman, Natalie W. published the artcileStudy of copper(II) ternary complexes with phosphocreatine and some polyamines in aqueous solution, Recommanded Product: Propane-1,3-diamine dihydrochloride, the publication is Journal of Inorganic Biochemistry (2011), 105(12), 1712-1719, database is CAplus and MEDLINE.

Ternary systems of Cu(II) with phosphocreatine (PCr) and the polyamines (PAs), ethylenediamine (en), 1,3-diaminopropane (tn), putrescine (Put), spermidine (Spd), and spermine (Spm), were studied in aqueous solution through potentiometry, UV-visible, EPR and Raman spectroscopy. The binary complex CuPCr was also studied by Raman spectroscopy, and the calculation of the min. stabilization energy was done assuming this mol. in aqueous solution The stability constants of the CuPCrPA ternary complexes were determined by potentiometry (T = 25¡ã, I = 0.1 mol L^–?¹, KNO₃). The stability order determined was CuPCrSpm > CuPCrSpd > CuPCren > CuPCrtn > CuPCrPut, the same order of the corresponding binary complexes of Cu(II) with these polyamines. The evaluation of intramol. PA-PCr interactions in protonated and deprotonated species of ternary complexes was carried out using the equation ¦¤log K = log ¦Â_CuPCrPAHq?₊?_p – (log ¦Â_CuPAHq + log ¦Â_CuPCrHp). All of the CuPCrPA ternary complexes have a square planar structure and are bonded to PCr through the N atom of the guanidine group and the O atom of the phosphate group, and to the PAs through two N atoms of the amine groups. The structure of the complex CuPCrSpm is planar with distortion towards tetrahedral. Calculation of the min. stabilization energy for the CuPCr and CuPCrenH complexes confirmed the proposed coordination mode.

Journal of Inorganic Biochemistry published new progress about 10517-44-9. 10517-44-9 belongs to catalysis-chemistry, auxiliary class Salt,Amine,Aliphatic hydrocarbon chain, name is Propane-1,3-diamine dihydrochloride, and the molecular formula is C15H12O8, Recommanded Product: Propane-1,3-diamine dihydrochloride.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Steinberg, Ilya Sh. published the artcileTwo-photon recording of microholograms in photopolymer materials with new cationic thioxanthone photoinitiators, HPLC of Formula: 2909-77-5, the publication is Optics Communications (2008), 281(17), 4297-4301, database is CAplus.

The authors have demonstrated two-photon induced recording of the microholograms at an arbitrary point within thick (?100 ¦Ìm) photopolymer material using photoinitiators on a basis of new cationic thioxanthone derivatives Such material provides high values of refractive index change ¦¤n = 4.8 ¡Á 10^-3, and holog. recording sensitivity S = 1.2 cm/J. A nanosecond laser pulse at a wavelength of 532 nm was used for recording. For the selective on the depth reading of the microholograms the method of collinear heterodyning was applied.

Optics Communications published new progress about 2909-77-5. 2909-77-5 belongs to catalysis-chemistry, auxiliary class Amine,Benzene, name is 2,6-Diisopropyl-N,N-dimethylaniline, and the molecular formula is C27H39ClN2, HPLC of Formula: 2909-77-5.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Robin, Clement published the artcileAdsorption of poly(methacrylic acid) onto differently charged silica nanoparticles and its consequences on particles clustering, SDS of cas: 13822-56-5, the publication is Colloids and Surfaces, A: Physicochemical and Engineering Aspects (2022), 128287, database is CAplus.

This work aims at gaining a comprehensive picture of the interactions between three differently functionalized silica nanoparticles and a polyacid – PMAA namely – in aqueous media. Native silica nanoparticles and silica nanoparticles functionalized with amine or quaternary amine groups are either neg. or pos. charged with various charge densities, whereas PMAA chains display an increasing neg. charge d. as the pH is increased from 3 to 9. Adsorption isotherms were obtained by Total Organic Carbon (TOC). It was shown that native silica interacts only weakly with PMAA while stronger adsorptions were evidenced for the two amine-functionalized silica. Whereas electrostatic attractive interactions between pos.-charged surfaces and neg.-charged PMAA are driving the adsorption at pH larger than 3, hydrophobic interactions between the Pr moieties of the grafts at the silica surfaces and the Me groups of the PMAA hypercoils are dominating at low pH value. In this last case, the more hydrophobic the silica surface is, the higher the adsorption. Contrary to expectations, hydrophobic interactions (dominating at low pH) seem to be stronger than attractive electrostatic interactions (dominating at pH larger than 3) as adsorbed amounts are larger in the first case. Small-angle X-ray scattering experiments were performed on PMAA/silica dispersions under the condition of saturation adsorption in order to correlate the extent of particle dispersion with polymer/surface interactions. The stronger the polymer/surface interactions, the more compact aggregates are formed.

Colloids and Surfaces, A: Physicochemical and Engineering Aspects published new progress about 13822-56-5. 13822-56-5 belongs to catalysis-chemistry, auxiliary class Organic Silicones, name is 3-(Trimethoxysilyl)propan-1-amine, and the molecular formula is C6H17NO3Si, SDS of cas: 13822-56-5.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Busacca, Carl A. published the artcileA Superior Method for the Reduction of Secondary Phosphine Oxides, Safety of Dimesitylphosphine oxide, the publication is Organic Letters (2005), 7(19), 4277-4280, database is CAplus and MEDLINE.

Diisobutylaluminum hydride (DIBAL-H) and triisobutylaluminum are outstanding reductants for secondary phosphine oxides (SPOs). All classes of SPOs can be readily reduced, including diaryl, arylalkyl, and dialkyl members. Many SPOs can now be reduced at cryogenic temperatures, and conditions for preservation of reducible functional groups were found. Even the most electron-rich and sterically hindered phosphine oxides can be reduced in a few hours at 50-70¡ã. This new reduction has distinct advantages over existing technologies.

Organic Letters published new progress about 23897-16-7. 23897-16-7 belongs to catalysis-chemistry, auxiliary class Aryl phosphine ligand,Mono-phosphine Ligands, name is Dimesitylphosphine oxide, and the molecular formula is C18H23OP, Safety of Dimesitylphosphine oxide.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Shorygin, P. P. published the artcileSpectroscopic study of the most important combinations of atomic groups in complex molecules of organic compounds. 3. Nitroaromatic compounds, HPLC of Formula: 1821-27-8, the publication is Russian Chemical Bulletin (Translation of Izvestiya Akademii Nauk, Seriya Khimicheskaya) (1998), 47(2), 297-302, database is CAplus.

The IR spectra of several compounds containing the nitro group were studied. Based on these and previous data, the state of the nitro group depending on the structure of the fragments bound to the nitrophenyl group was discussed. The redistribution of the electron d. during vibrations of the nitro group and the substituent atoms was considered. The effects of the ¦Ð-bond system, bridging atoms separating the nitrophenyl group from the substituents, and heavy atoms adjacent to the bridging atom were characterized. The data obtained facilitates the selection of mol. structures satisfying the specified requirements of practical applications.

Russian Chemical Bulletin (Translation of Izvestiya Akademii Nauk, Seriya Khimicheskaya) published new progress about 1821-27-8. 1821-27-8 belongs to catalysis-chemistry, auxiliary class Nitro Compound,Amine,Benzene, name is Bis(4-nitrophenyl)amine, and the molecular formula is C5H7NO, HPLC of Formula: 1821-27-8.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Shorygin, P. P. published the artcileSpectroscopic study of nitroaromatic amines, Recommanded Product: Bis(4-nitrophenyl)amine, the publication is Zhurnal Fizicheskoi Khimii (1965), 39(12), 2868-76, database is CAplus.

The ir, uv, and Raman spectra of PhNO₂ and p-XHNC₆H₄NO₂ in the vapor and in solution in different solvents were compared. For amino derivatives, 2 bands in the frequency region of NO₂-groups, ¦Ø₈, were characteristic. These were sensitive to solvents and temperature The effect of solvents on the vibration frequency of the nitrile groups, ¦Ø_CN, was similar for p-H₂NC₆H₄NO₂ and p-Me₂NC₆H₄NO₂ but was much weaker than the effect on ¦Ø₈. Alkylation of the amino group affected the frequency of the NO₂ group to a much greater degree than that of the NH₂ group. This was true not only of solutions but also of vapors suggesting the possibility that in isolated mols. the NO₂ group affects the rigidity of the N-O bond through the system of ¦Ð-bonds of the C₆H₆ ring. In neutral solvents and in the gaseous phase ¦Ø₈ of derivatives with X = NH₂, Ph, and H₂NC₆H₄ was about the same. This was also true of 4,3,5-H₂NX₂C₆H₂NO₂, where X = H, Cl, Br.

Zhurnal Fizicheskoi Khimii published new progress about 1821-27-8. 1821-27-8 belongs to catalysis-chemistry, auxiliary class Nitro Compound,Amine,Benzene, name is Bis(4-nitrophenyl)amine, and the molecular formula is C8H6ClF3, Recommanded Product: Bis(4-nitrophenyl)amine.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Ma, He published the artcileNew Cy5 photosensitizers for cancer phototherapy: A low singlet-triplet gap provides high quantum yield of singlet oxygen, SDS of cas: 104-03-0, the publication is Chemical Science (2021), 12(41), 13809-13816, database is CAplus and MEDLINE.

In the current work, a new strategy to enhance the singlet-triplet intersystem crossing (ISC) and high phototherapy efficiency was developed, based on the mol. design of a thio-pentamethine cyanine dye I [X = H, 4-MeOC₆H₄, 4-O₂NC₆H₄, CHO, Q] (TCy5) as a photosensitizer. The introduction of an electron-withdrawing group at the meso-position of I could dramatically reduce the singlet-triplet energy gap (¦ÄEst) value (from 0.63 eV to as low as 0.14 eV), speed up the ISC process (¦ÓISC = 1.7 ps), prolong the lifetime of the triplet state (¦ÓT = 319¦Ìs) and improve singlet oxygen (¹O₂) quantum yield to as high as 99%, a value much higher than those of most reported triplet PSs. Further in vitro and in vivo experiments showed that I [X = CHO], with its efficient ¹O₂ generation and good biocompatibility, causes an intense tumor ablation in mice. This provided a new strategy for designing ideal photosensitizers for cancer phototherapy.

Chemical Science published new progress about 104-03-0. 104-03-0 belongs to catalysis-chemistry, auxiliary class Nitro Compound,Carboxylic acid,Benzene, name is 4-Nitrophenylacetic acid, and the molecular formula is C8H7NO4, SDS of cas: 104-03-0.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Marino, Thomas published the artcilePostcure Effects on Photopolymerization Using Visible Light Initiators, Application In Synthesis of 2909-77-5, the publication is Industrial & Engineering Chemistry Research (1995), 34(12), 4549-52, database is CAplus.

In a continuing study of the visible light initiator 5,7-diiodo-3-butoxy-6-fluorone, significant postcure is observed in propylene glycol-maleic anhydride-terephthalic acid-styrene copolymer formed under both aerobic and anaerobic conditions either in the presence or absence of ambient light. The extent of postcure varies with the test conditions. A tentative explanation is proposed.

Industrial & Engineering Chemistry Research published new progress about 2909-77-5. 2909-77-5 belongs to catalysis-chemistry, auxiliary class Amine,Benzene, name is 2,6-Diisopropyl-N,N-dimethylaniline, and the molecular formula is C14H23N, Application In Synthesis of 2909-77-5.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Younis, Muhammad published the artcileReversible Transformation between Azo and Azonium Bond Other than Photoisomerization of Azo Bond in Main-Chain Polyazobenzenes, Recommanded Product: Bis(4-nitrophenyl)amine, the publication is Journal of Physical Chemistry Letters (2021), 12(14), 3655-3661, database is CAplus and MEDLINE.

Although side-chain polyazobenzenes have been extensively studied, main-chain polyazobenzenes (abbreviated MCPABs) are rarely reported due to the challenges associated with difficulty in synthetic chem. and photoisomerization of azo bonds in MCPABs. Thus, it is highly demanded to develop new mechanisms other than photoisomerization of azo bonds in MCPABs to extend their applications. In this work, we created a new series of N-linked MCPABs via fast NaBH₄-mediated reductive coupling polymerization on N-substituted bis(4-nitrophenyl)amines. The structure of MCPABs has been characterized by comprehensive solid-state NMR experiments such as CPMAS ¹³C NMR with long and short contact times, cross-polarization polarization-inversion (CPPI), and cross-polarization nonquaternary suppressed (CPNQS). The azo bonds in MCPABs were found to be promising for acid vapor sensing, being acidified to form azonium ion with significant color change from red to green. And the azonium of MCPABs turned from green to red when exposed to base vapor, thus suitable for base vapor sensing.

Journal of Physical Chemistry Letters published new progress about 1821-27-8. 1821-27-8 belongs to catalysis-chemistry, auxiliary class Nitro Compound,Amine,Benzene, name is Bis(4-nitrophenyl)amine, and the molecular formula is C9H8BNO2, Recommanded Product: Bis(4-nitrophenyl)amine.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Derrick, Jeffrey S. published the artcileTemplating Bicarbonate in the Second Coordination Sphere Enhances Electrochemical CO₂ Reduction Catalyzed by Iron Porphyrins, Category: catalysis-chemistry, the publication is Journal of the American Chemical Society (2022), 144(26), 11656-11663, database is CAplus and MEDLINE.

Bicarbonate-based electrolytes are ubiquitous in aqueous electrochem. CO₂ reduction, particularly in heterogeneous catalysis, where they demonstrate improved catalytic performance relative to other buffers. In contrast, the presence of bicarbonate in organic electrolytes and its roles in homogeneous electrocatalysis remain underexplored. Here, the authors study the influence of bicarbonate on Fe porphyrin-catalyzed electrochem. CO₂ reduction Bicarbonate is a viable proton donor in organic electrolyte (pK_a = 20.8 in DMSO) and urea pendants in the 2nd coordination sphere can be used to template bicarbonate in the vicinity of a mol. Fe porphyrin catalyst. The templated binding of bicarbonate increases its acidity, resulting in a 1500-fold enhancement in catalytic rates relative to unmodified parent Fe porphyrin. This work emphasizes the importance of bicarbonate speciation in wet organic electrolytes and establishes 2nd-sphere bicarbonate templating as a design strategy to harness this adventitious acid and enhance CO₂ reduction catalysis.

Journal of the American Chemical Society published new progress about 17351-61-0. 17351-61-0 belongs to catalysis-chemistry, auxiliary class Phase Transfer Catalyst, name is Tetraethylammonium hydrogencarbonate, and the molecular formula is C9H21NO3, Category: catalysis-chemistry.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia