547-58-0Relevant articles and documents
Molecular Assemblies Offering Hydrogen-Bonding Cavities: Influence of Macrocyclic Cavity and Hydrogen Bonding on Dye Adsorption
Gupta, Rajeev,Gupta, Ruchika,Pachisia, Sanya
supporting information, p. 3616 - 3630 (2022/03/02)
This work presents a set of Hg macrocycles of amide-phosphine-based ligands offering H-bonding cavities of different dimensions. Such macrocycles are shown to selectively adsorb anionic dyes followed by neutral dyes as well as Prontosil, a biologically relevant antibiotic, within their cavities with the aid of H-bonding-assisted encapsulation. Kinetic experiments supported by spectroscopic and docking studies illustrate the importance of the cavity structure as well as H-bonds for the selective adsorption of dyes.
A method for continuously preparing azo dye in micro-reactors
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Paragraph 0064-0070, (2018/04/01)
The invention discloses a method for continuously preparing azo dye in micro-reactors in the field of dye synthesis. The azo dye is prepared by firstly subjecting a sodium nitrite solution, an aromatic primary amine and an inorganic acid to a diazotization reaction at room temperature in a first micro-reactor to generate an aromatic primary amine diazonium salt; and then subjecting the aromatic primary amine diazonium salt and a coupling component to a coupling reaction in a second micro-reactor to generate the azo dye. Continuous preparation of the azo dye is achieved by utilizing the micro-reactors, a process is simple, a reaction period is short, and a reaction process can be easily monitored and controlled. Addition of an excessive amount of the sodium nitrite and the coupling agent to increase the reaction speed is not required so that raw materials are saved and the method is environmentally friendly. Reaction liquid in the micro-reactors achieves high-speed collision mixing, a uniform reaction environment is formed immediately, the reaction efficiency is high, and the yield and quality of a reaction product are greatly improved.
PROCESS FOR THE SYNTHESIS OF ARYLDIAZONIUM SALTS USING NITROGEN OXIDES IN OXYGEN-CONTAINING GAS STREAMS, ESPECIALLY FROM INDUSTRIAL WASTE GASES
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Page/Page column 43, (2017/06/30)
The present invention relates to a process for the synthesis of aryldiazonium salts using nitrogen oxides in oxygen-containing gas streams, especially from industrial waste gases.
PREPARATION OF AZO COMPOUNDS WITH SOLID CATALYSTS
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Page/Page column 7, (2011/06/23)
The present invention refers to a procedure for preparing azo compounds comprising a reaction between at least: one amine or polyamine, molecular oxygen, a catalyst comprising at least one support selected from at least a metal oxide of one of the elements of the groups 3, 4, 5, 6, 8, 9, 11 and 13, silica, an anionic laminar compound of hydrotalcite type or its derivatives, active carbon or an organic polymer. In addition, said catalyst may contain nanoparticles of gold.
Interaction of Methyl Orange with Submicellar Cationic Surfactants
Dutta, Robin K.,Bhat, Subray N.
, p. 2457 - 2460 (2007/10/02)
The interaction of aqueous Methyl Orange (MO), an azo dye, with alkyltrimethylammonium and N-hexadecylpyridinium halide surfactants in submicellar concentration ranges has been investigated.The interaction gives rise to a new absorption band of MO with a maximum at ca. 370 nm, and the appearance of the new band has been attributed to change in the chromophore microenvironment in water structure enforced closely packed ion pairs of the dye with submicellar cationic surfactant.The strength of the interaction depends on the alkyl chain length of the surfactant, the surfactant head group and the counter ions.
Solvent Effects on Chemical Processes. 2. Binding Constants of Methyl Orange with α-Cyclodextrin in Binary Aqueous-Organic Solvents
Connors, Kenneth A.,Mulski, Michael J.,Andrea Paulson
, p. 1794 - 1798 (2007/10/02)
The standard free energy change for complex formation is written as a sum of effects from solvent-solvent interactions (the general medium effect), solvent-solute interactions (the solvation effect), and solute-solute interactions (the intersolute effect)
Thermodynamic Analysis of Ion-Pair Partition of Methyl Orange Anion with Alkali Metal Cations in an Octanol-Water System
Yoshikawa, Yuko,Terada, Hiroshi
, p. 2759 - 2765 (2007/10/02)
The ion-pair partition of methyl orange anion with the alkali metal cations Na+, K+ and Cs+ in an octanol-water system was studied at various temperatures.The ion-pair partition process could be divided into two process; ion-pair formation and transfer of the ion-pair.The results showed that the degree of ion-pair formation increased with temperature, while the degree of partition of an ion-pair decreased with temperature for all alkali metal cations.The ion-pair partition of methyl orange anion was shown to be greatest with Cs+.The thermodynamic parameters ΔG0, ΔS0 and ΔH0 for these two processes were determined.The values are discussed in relation to the degree of hydration of these alkali metal cations.Keywords-partition; ion-pair partition; partition coefficient; ion-pair partition coefficient; ion-pair formation constant; ion-pair extraction constant; methyl orange; alkali metal cation; thermodynamic analysis
