Category: 18464-23-8

Chemistry is the experimental and theoretical study of materials on their properties at both the macroscopic and microscopic levels.In a patent， category: catalyst-ligand, Which mentioned a new discovery about 18464-23-8

Interactions between poly(amidoamine)dendrimers with surface carboxyl groups and cationic surfactants in aqueous solutions were investigated by surface tension, fluorescence spectra, and dynamic scattering measurements. The dendrimers used were three generations (G1.5, 3.5, and 5.5) and two cationic surfactants were dodecyltrimethylammonium bromide (DTAB) and 1,2- bis(dodecyldimethylammonio)ethane dibromide (2RenQ). Under a constant concentration of surface groups of the dendrimers, the results of surface tension and fluorescence spectra measurements indicate that aggregates between DTAB and the dendrimers are formed at lower DTAB concentration than that of DTAB alone, whereas those between 2RenQ and the dendrimers are formed at higher 2RenQ concentration than that of 2RenQ alone. In addition, the aggregates show higher surface activity when the generation decreases from 5.5 to 1.5. Hydrodynamic radius obtained from dynamic scattering measurement suggests that the aggregates are formed by adsorbing surfactant on the surface of the dendrimers, not by bridging the dendrimers through the surfactant. (C) 2000 Elsevier Science B.V. Interactions between poly(amidoamine)dendrimers with surface carboxyl groups and cationic surfactants in aqueous solutions were investigated by surface tension, fluorescence spectra, and dynamic scattering measurements. The dendrimers used were three generations (G1.5, 3.5, and 5.5) and two cationic surfactants were dodecyltrimethylammonium bromide (DTAB) and 1,2-bis(dodecyldimethylammonio)ethane dibromide (2RenQ). Under a constant concentration of surface groups of the dendrimers, the results of surface tension and fluorescence spectra measurements indicate that aggregates between DTAB and the dendrimers are formed at lower DTAB concentration than that of DTAB alone, whereas those between 2RenQ and the dendrimers are formed at higher 2RenQ concentration than that of 2RenQ alone. In addition, the aggregates show higher surface activity when the generation decreases from 5.5 to 1.5. Hydrodynamic radius obtained from dynamic scattering measurement suggests that the aggregates are formed by adsorbing surfactant on the surface of the dendrimers, not by bridging the dendrimers through the surfactant.

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Reference：
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

Electric Literature of 18464-23-8, The reaction rate of a catalyzed reaction is faster than the reaction rate of the uncatalyzed reaction at the same temperature.18464-23-8, Name is N1,N2-Didodecyl-N1,N1,N2,N2-tetramethylethane-1,2-diaminium bromide, molecular formula is C30H66Br2N2. In a Article，once mentioned of 18464-23-8

The inhibition effect of two quaternary ammonium salts namely: N1,N2-didodecyl-N1,N1,N2,N2-tetramethylethane-1,2-diaminium bromide (I) and N-(2-hydroxyethyl)-N,N-dimethyldodecan-1-aminium bromide (II) on the corrosion of copper in 1 M HNO3 has been investigated by polarization, electrochemical impedance spectroscopy (EIS) and electrochemical frequency modulation (EFM) techniques. Polarization studies showed that these compounds are mixed-type inhibitors. The inhibition efficiency increases with increasing the inhibitor concentration and the maximum inhibition (93.9% and 90.8%) was obtained in the presence of 1 × 10- 3 M of I and II, respectively. The adsorption of these inhibitors on the copper surface obeys Langmuir isotherm. The results obtained from the different electrochemical techniques were in good agreement.

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Reference：
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

In homogeneous catalysis, the catalyst is in the same phase as the reactant. The number of collisions between reactants and catalyst is at a maximum.In a patent, 18464-23-8, name is N1,N2-Didodecyl-N1,N1,N2,N2-tetramethylethane-1,2-diaminium bromide, introducing its new discovery. SDS of cas: 18464-23-8

In this study, the gemini surfactants of the alkanediyl-alpha-omega- bis(alkyl dimethyl ammonium) dibromide type, on the one hand, with different alkyl groups containing m carbon atoms and an ethanediyl spacer, referred to as ”m-2-m” (m = 10, 12 and 16) and, on the other hand, with n-C16 alkyl groups and different spacers containing s carbon atoms, referred to as ”16-s-16” (s = 2, 6, 10 and Ar (8)) have been synthesized, purified and characterized. The critical micelle concentration (CMC), micelle ionization degree (alpha) and Gibbs free energy of micellization (DeltaGmic) of these surfactants and the monomeric cationic surfactants DTAB and CTAB have been determined by means of electric conductivity measurements. In addition, the temperature dependence of the CMC was determined for the 10-2-10 gemini surfactant. The CMCs of the gemini surfactants are found to be much lower than those of the corresponding monomeric surfactants and the effect of the hydrophobic alkyl chain length is more important than that of the spacer. The CMC of 16-s-16 passes through a maximum of (or around) s = 6 and then decreases for s = 10. The presence of a maximum CMC is explained by the contribution of a change of conformation of the surfactant with increasing spacer chain length. The changes of a with s and m are found qualitatively similar to those found for CMC values. The values of DeltaGmic are more negative for the dimers than for the monomers and also change with an increasing spacer carbon number, as CMC values do. The thermodynamic parameters of micellization indicate that the micellization of 10-2-10 is enthalpy driven. AOCS 2011.

The proportionality constant is the rate constant for the particular unimolecular reaction. the reaction rate is directly proportional to the concentration of the reactant. I hope my blog about 18464-23-8 is helpful to your research. SDS of cas: 18464-23-8

Reference：
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

Chemistry is the experimental and theoretical study of materials on their properties at both the macroscopic and microscopic levels.In a patent， Computed Properties of C30H66Br2N2, Which mentioned a new discovery about 18464-23-8

Bis-alkylated derivatives of N,N,N?,N?- tetramethylethylenediamine (TMEDA) represent a well-known class of versatile biscationic amphiphiles, owing to their low cost and ease of preparation. Asymmetric TMEDA derivatives, however, have been studied significantly less, particularly in regards to their antimicrobial properties. We have thus prepared a series of 36 mono-and bis-alkylated TMEDA derivatives to evaluate their inhibition of bacterial growth. This series of compounds showed low micromolar activity against a panel of four bacteria. Optimal inhibition was observed when the biscationic amphiphiles possessed modest asymmetry and were composed of between 20 and 24 total carbon atoms in the side chains. These amphiphiles were prepared in a simple two-step procedure, utilizing inexpensive materials and atom-economical reactions, making them practical for further development.

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Reference：
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

Catalysts function by providing an alternate reaction mechanism that has a lower activation energy than would be found in the absence of the catalyst. In some cases, the catalyzed mechanism may include additional steps.In a article, 18464-23-8, molcular formula is C30H66Br2N2, introducing its new discovery. Recommanded Product: N1,N2-Didodecyl-N1,N1,N2,N2-tetramethylethane-1,2-diaminium bromide

In this study two types cationic surfactants were synthesized, purified, and characterized in our laboratory. One them is a series of cationic surfactants, a two tail-one head surfactant, N,N-dialkyl-N,N-diethylammonium bromide, abbreviated as “m-0-m” (m = 10, 12, and 16). The other type is N,N?-dialkyl-N,N,N?,N?-tetramethyl-N,N?-ethanediyl-diammonium dibromide, two tail-two head surfactants, abbreviated as “m-2-m” (m = 12 and 16). Once NMR spectra (1H NMR, 13C NMR) for all the gemini surfactants that were synthesized were taken, then the melting temperatures (TM) were measured. These surfactants have very high surface activity. The main goal of our study was to examine some properties of these two tail cationic surfactants by manipulating their dimeric structure. The effects of alkyl chain length and headgroup on surfactant self-assembly in solution were investigated. Critical micelle concentrations (CMC), degree of micelle ionization (alpha), and Krafft temperatures (TK) of 1 wt % aqueous solutions of these surfactants were determined by conductance measurements. Krafft points were found to be dependent on the number of carbon atoms in the alkyl chain and decreased by the addition of the electrolytes. The absence of the spacer group, peculiar to these twin tail cationic surfactants, may confer relatively low flexibility to the molecules, with potential implications on the interfacial properties, namely, on micellization.

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Reference：
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

Electric Literature of 18464-23-8, Catalysts are substances that increase the reaction rate of a chemical reaction without being consumed in the process. 18464-23-8, Name is N1,N2-Didodecyl-N1,N1,N2,N2-tetramethylethane-1,2-diaminium bromide, molecular formula is C30H66Br2N2. In a Article，once mentioned of 18464-23-8

Surface-active properties and antimicrobial study of conventional cationic and synthesized symmetrical gemini surfactants

Symmetrical gemini surfactants of cationic series alpha,omega- alkanediyl bis (dimethyl ammonium bromide) commonly referred as ”m-s-m” have been synthesized. Spectral analysis was performed to confirm compound structures and purity. Conductivity and surface tension measurements provide better understanding of the micellization process. Their self-assembly behavior in aqueous solution is also discussed in detail. The antimicrobial efficacy was measured by bacterial and fungal growth inhibition expressed as minimal inhibitory concentration values against five strains of a representative group of microorganisms viz. Bacillus subtilis, Staphylococcus aureus, Klebsiella pneumonia, Salmonella paratyphi B and Aspergillus niger. All of the synthesized surfactants showed antimicrobial activity against them, but at different levels depending on their structures. The surfactants possessing longer alkyl chains (more hydrophobic environment) demonstrated better antimicrobial functionality. The antimicrobial potency was found to be dependent on the representative target microorganism (Gram-positive bacteria > fungi >Gram-negative bacteria), as well as on the ionic nature of the surfactant (cationic), alkyl chain length (m = 12, 16) and spacer length (s = 2, 4, 6) of the synthesized compounds. Gemini surfactants such as 12-2-12 and 12-4-12 were found to be weakly active whereas 16-2- 16 and 16-4-16 compounds proved to be the most potent antimicrobial surface-active agents among the synthesized gemini homologues. AOCS 2011.

Sometimes chemists are able to propose two or more mechanisms that are consistent with the available data. Electric Literature of 18464-23-8, If a proposed mechanism predicts the wrong experimental rate law, however, the mechanism must be incorrect.Welcome to check out more blogs about 18464-23-8, in my other articles.

Reference：
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

Chemistry is traditionally divided into organic and inorganic chemistry. Application In Synthesis of N1,N2-Didodecyl-N1,N1,N2,N2-tetramethylethane-1,2-diaminium bromide. The former is the study of compounds containing at least one carbon-hydrogen bonds.In a patent，Which mentioned a new discovery about 18464-23-8

Dilational rheological properties of gemini surfactant 1,2-ethane bis(dimethyl dodecyl ammonium bromide) at air/water interface

The dilational rheological properties of 1,2-ethane bis(dimethyl dodecyl ammonium bromide) (C12C2C12·2Br) at air/water interface were investigated using oscillating barriers method at low frequency (0.005-0.1 Hz). The dilational modulus of C12C2C12·2Br is higher than that of dodecyltrimethyl ammonium bromide (DTAB), indicating the strength against perturbation of interfacial layer of the former is greater. This phenomenon is explained by molecular dynamics simulation. Many factors have great effect on the dilational rheology such as bulk concentration, temperature and NaBr. The results reveal that the dilational modulus passes through a maximum value with C12C2C12·2Br concentration increasing. It is also found that the maximum value of the dilational viscous component appears at different concentration with the dilational frequency increasing. And the higher the dilational frequency is, the higher the concentration corresponding to the maximum value of the dilational viscous component is. When temperature rises, the dilational modulus decreases gradually. Moreover, the addition of NaBr can increase the dilational modulus of C12C2C12·2Br.

Note that a catalyst decreases the activation energy for both the forward and the reverse reactions and hence accelerates both the forward and the reverse reactions.Application In Synthesis of N1,N2-Didodecyl-N1,N1,N2,N2-tetramethylethane-1,2-diaminium bromide, you can also check out more blogs about18464-23-8

Reference：
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

Catalysts function by providing an alternate reaction mechanism that has a lower activation energy than would be found in the absence of the catalyst. In some cases, the catalyzed mechanism may include additional steps.In a article, 18464-23-8, molcular formula is C30H66Br2N2, introducing its new discovery. name: N1,N2-Didodecyl-N1,N1,N2,N2-tetramethylethane-1,2-diaminium bromide

Phase Transfer Catalysis with Quaternary Ammonium Type Gemini Surfactants: O-Alkylation of Isovanillin

In this paper, O-alkylation of isovanillin with unusual phase transfer catalysts alkandiyl-alpha,omega-bis(dimethylalkylammonium bromide) dimeric surfactants (also known as gemini surfactants) is described. Some dimeric surfactants with simple hydrophobic alkyl chains and others with hydrophobic alkyl chains containing ester functionalities with different lengths were synthesized and characterized in our laboratory. The alkylation of isovanillin with alkyl halide was successively carried out in the presence of potassium carbonate and a phase transfer catalyst in tetrahydrofuran. The same reactions were also performed with both the traditional phase transfer catalyst tetrabutylammonium bromide and without any catalyst. The results were compared with those of dimeric surfactants. Consequently, it was expressed that alkandiyl-alpha,omega-bis(dimethylalkylammonium bromide) dimeric surfactants successively exhibit the character of phase transfer catalysts through environmentally friendly procedures under mild conditions. The most significant feature of this work is that dimeric surfactants have been determined to act as phase transfer agents.

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Reference：
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

A catalyst don’t appear in the overall stoichiometry of the reaction it catalyzes, COA of Formula: C30H66Br2N2, but it must appear in at least one of the elementary reactions in the mechanism for the catalyzed reaction. 18464-23-8, Name is N1,N2-Didodecyl-N1,N1,N2,N2-tetramethylethane-1,2-diaminium bromide, molecular formula is C30H66Br2N2. In a Article, authors is Graciani, Maria Del Mar£¬once mentioned of 18464-23-8

Concentration and medium micellar kinetic effects caused by morphological transitions

The reaction methyl naphthalene-2-sulfonate + Br- was investigated in several alkanediyl-alpha-omega-bis(dodecyldimethylammonium) bromide, 12-s-12,2Br- (with s = 2, 3, 4, 5, 6, 8, 10, 12), micellar solutions in the absence and in the presence of various additives. The additives were 1,2-propylene glycol, which remains in the bulk phase, N-decyl N-methylglucamide, MEGA10, which forms mixed micelles with the dimeric surfactants, and 1-butanol, which distributes between the aqueous and micellar phases. Information about the micellar reaction media was obtained by using conductivity and fluorescence measurements. In all cases, with the exception of water-1,2-prop 12-5-12,2Br- micellar solutions, with 30% weight percentage of the organic solvent, a sphere-to-rod transition takes place upon increasing surfactant concentration. In order to quantitatively explain the experimental data within the whole surfactant concentration range, a kinetic equation based on the pseudophase kinetic model was considered, together with the decrease in the micellar ionization degree accompanying micellar growth. However, theoretical predictions did not agree with the experimental kinetic data for surfactant concentrations above the morphological transition. An empirical kinetic equation was proposed in order to explain the data. It contains a parameter b which is assumed to account for the medium micellar kinetic effects caused by the morphological transition. The use of this empirical equation permits the quantitative rationalization of the kinetic micellar effects in the whole surfactant concentration range.

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Reference£º
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI