Raman study of the influence of cesium bromide, tetramethylammonium bromide, ammonium bromide, and tetrabutylammonium bromide on water structure at 40 and 80.deg.

1975 ◽  
Vol 79 (9) ◽  
pp. 913-916 ◽  
Author(s):  
M. Lucas ◽  
A. De Trobriand ◽  
M. Ceccaldi
Keyword(s):  
Tetrabutylammonium Bromide ◽  
Water Structure ◽  
Ammonium Bromide ◽  
Cesium Bromide ◽  
Tetramethylammonium Bromide ◽  
Raman Study

Effect of pressures to 3 kbar on the electrical conductivity of tetramethyl-ammonium bromide and hydrobromic acid in propan-1-ol and propan-2-ol

1976 ◽  
Vol 29 (2) ◽  
pp. 249 ◽  
Author(s):  
JF Cukurins ◽  
W Strauss
Keyword(s):  
Electrical Conductivity ◽  
Hydrobromic Acid ◽  
Hydrogen Bromide ◽  
Ammonium Bromide ◽  
Proton Conductance ◽  
Tetramethyl Ammonium ◽  
Tetramethylammonium Bromide

The conductances of tetramethylammonium bromide and hydrogen bromide have been measured in propan-1- and -2-ol at 25�C to pressures of 3 kbar. The increase in pressure has an almost identical effect on the excess proton conductance in both solvents, approximately doubling this to 1.5 kbar, after which it remains approximately constant.

Efficient Synthesis of Novel Thioureidobenzamido Alkyl Naphthols in Molten Tetrabutylammonium Bromide

2019 ◽  
Vol 16 (11) ◽  
pp. 906-910
Author(s):  
Arman Shokooh Saljooghi ◽  
Hojatollah Khabazzadeh ◽  
Moj Khaleghi
Keyword(s):  
Molten Salt ◽  
Organic Solvents ◽  
Multicomponent Reactions ◽  
Tetrabutylammonium Bromide ◽  
Aromatic Aldehydes ◽  
Ammonium Bromide ◽  
Efficient Synthesis ◽  
Tetrabutyl Ammonium Bromide ◽  
Tetrabutyl Ammonium

A new series of benzamido alkyl naphthols were synthesized from the multi-component reaction of 4-(3′-methylthioureido)benzamide, aromatic aldehydes and 2-naphthol. Molten tetrabutyl ammonium bromide was used as a very efficient medium for this reaction while the use of common organic solvents gave no or poor yields. This method is an interesting instance of using molten salt as a medium in multicomponent reactions.

Apparent Molal Heat Capacities and Volumes of Tetrabutylammonium Carboxylates and Related Solutes in Water at 25 °C

1973 ◽  
Vol 51 (17) ◽  
pp. 2993-2998 ◽  
Author(s):  
Paul-André Leduc ◽  
Jacques E. Desnoyers
Keyword(s):  
Concentration Dependence ◽  
Sodium Acetate ◽  
Ammonium Acetate ◽  
Tetrabutylammonium Bromide ◽  
Heat Capacities ◽  
Ammonium Bromide ◽  
Sodium Octanoate ◽  
Apparent Molal Volumes ◽  
Molal Volumes ◽  
Apparent Molal Heat Capacities

The apparent molal volumes and heat capacities were measured in water at 25 °C with a flow digital densimeter and a flow microcalorimeter for the following salts: tetrabutylammonium octanoate, tetrabutylammonium butanoate, tetrabutylammonium bromide, ammonium acetate, ammonium chloride, ammonium bromide, sodium octanoate, and sodium acetate. The tetrabutylammonium octanoate and butanoate and sodium octanoate form micelles at 0.13, 0.6, and 0.35 M, respectively. The concentration dependence of the apparent molal volumes of the carboxylate salts is similar to that of typical hydrophobic or hydrophilic electrolytes. On the other hand, in the submicellar region, the concentration dependence of their apparent molal heat capacities is abnormal when compared with model electrolytes. It seems that the heat capacities may be reflecting interactions involving a hydrogen bonding of the carboxylate group with water.

scholarly journals On a Ti Study of Molecular Motion in Some Tetra Substituted Ammonium Halides

1979 ◽  
Vol 34 (11) ◽  
pp. 1296-1300
Author(s):  
Fevzi Köksal
Keyword(s):  
Molecular Motion ◽  
Relaxation Times ◽  
Tetrabutylammonium Bromide ◽  
Lattice Relaxation ◽  
Spin Lattice Relaxation ◽  
Tetraethylammonium Bromide ◽  
Tetraethylammonium Chloride ◽  
Spin Lattice ◽  
Ammonium Halides ◽  
Tetramethylammonium Bromide

The spin-lattice relaxation times of tetramethylammonium bromide (CH3)4NBr , iodide (CH3)4NI, tetraethylammonium chloride (CH3CH2)4NCl, bromide (CH3CH2)4NBr, iodide (CH3CH2)4NI , tetrapropylammonium iodide [CH3(CH2)2]4NI, tetrabutylammonium bromide [CH3(CH2)3]4NBr, iodide [CH3(CH2)3]4NI, tetraheptylammonium bromide [CH3(CH2)6]4NBr and iodide [CH3(CH2)6]4NI were measured at 60 MHz in the temperature interval 100 K to near the melting points. Two minima of T1 were observed for tetramethylammonium halides, for tetraethylammonium bromide and iodide and for tetrapropylammonium iodide. The minima in T1 were attributed to CH3 group reorientations and reorientations of the tetramethyl, ethyl and propylammonium cations. The activation energies of the processes were determined

Extraction Of Remazol Brilliant Orange 3R From Textile Wastewater Using Tetrabutyl Ammonium Bromide

2012 ◽  
Author(s):  
Norasikin Othman ◽  
Norlisa Mili ◽  
Siti Nazrah Zailani ◽  
Nurul Aimi Badriah Mohammad
Keyword(s):  
Organic Phase ◽  
Ph Effect ◽  
Tetrabutylammonium Bromide ◽  
Textile Wastewater ◽  
Liquid Extraction ◽  
Ammonium Bromide ◽  
Aquatic Life ◽  
Tetrabutyl Ammonium Bromide ◽  
Liquid Liquid Extraction ◽  
Tetrabutyl Ammonium

Air sisa buangan tekstil yang mengandungi pewarna adalah merbahaya kepada persekitaran dan mempengaruhi kehidupan akuatik. Kepekatan pewarna ini mestilah dikurangkan ke paras yang dibenarkan sebelum dibuang ke persekitaran. Dalam kajian ini, kaedah pengekstrakan cecair telah digunakan untuk mengkaji perolehan semula pewarna Remazol Brilliant Orange 3R daripada air sisa dengan menggunakan tetrabutilammonia bromida dalam diklorometana. Parameter yang dikaji adalah kesan pelarut, pH larutan, kepekatan pengekstrak, kepekatan awal pewarna dan egen pelucut yang sesuai untuk mengekstrak semula pewarna daripada fasa organik. Keputusan eksperimen menunjukkan hampir 100% daripada 100mgL-1 Remazol Brilliant Oren 3R telah diekstrak menggunakan 0.01 M tetrabutilammonia bromida (TBAB) dan tiada pengaruh pH larutan suapan yang ketara ke atas proses pengekstrakan pewarna. Pewarna yang telah diekstrak boleh diperolehi semula daripada larutan organik dengan menggunakan asid salisilik dalam larutan natrium hidroksida dengan nisbah 1:1. Kata kunci: Pengekstrakan cecair; pewarna reaktif azo; oren 3R; tetrabutilammonia bromida; air sisa tektil Textile wastewater containing dyes is dangerous to the environment and affect mainly to some aquatic life. Their concentration must be reduced to acceptable levels before discharging into environment. In this research liquid-liquid extraction method is used to study on the recovery of Remazol Brilliant Orange 3R dye (orange 3R) from textile wastewater by using tetrabutyl ammonium bromide in dichloromethane. The parameter examined in this research were the effect of diluents, effect of pH, effect of extractant concentration, initial dye concentration and the suitable stripping agent to extract back the dye from organic phase. The result showed that almost 100% of 100 mgL-1 Orange 3R was extracted using 0.01 M tetrabutylammonium bromide (TBAB) and no significant affect of pH of feed phase solution on dye extraction. Extracted dye in the organic phase can be back extracted using salicylic acid in sodium hydroxide solution with ratio 1:1. Key words: Liquid–liquid extraction; reactive azo dye; Orange 3R; tetrabutyl ammonium bromide; textile wastewater

Hydrothermal Synthesis of Hydroxyapatite Powders Using Alkyl Ammonium Bromides as Surfactants

2007 ◽  
Vol 342-343 ◽  
pp. 873-876
Author(s):  
Hyun Jung Park ◽  
Vikram V. Dabhade ◽  
Kyung Ja Kim ◽  
Soo Ryong Kim ◽  
Woo Teck Kwon ◽  
...  
Keyword(s):  
Calcium Nitrate ◽  
Nanocrystalline Powders ◽  
Ammonium Bromide ◽  
Calcium Nitrate Tetrahydrate ◽  
Tetraethylammonium Bromide ◽  
Chemical Route ◽  
Tetramethylammonium Bromide ◽  
Nitrate Tetrahydrate ◽  
Size And Morphology ◽  
Alkyl Ammonium

Rod shaped nanocrystalline powders of hydroxyapatite (HAp) were synthesized by a low temperature chemical route involving calcium nitrate tetrahydrate and sodium phosphate. Three types of alkyl ammonium bromide surfactants i.e. tetrapropylammonium bromide, tetraethylammonium bromide and tetramethylammonium bromide were used to regulate the nucleation and crystal growth. The synthesized powders were characterized by XRD, SEM and FTIR. The effect of the various alkyl ammonium bromide surfactants on the phase formation, particle size and morphology of the hydroxyapatite powders has been investigated and reported.

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