Photolysis of N-nitrosomethylaminoanthraquinones

Calorimetric Study of the Adsorption of Short-Chain Nonionic Surfactants on Silica Glass and Graphite: Dimethyldecylamine Oxide and Octyl Monoglucoside

“…This finding has been taken as an indication that adsorption in this second step involves a surface aggregation at the solid/liquid interface, driven by hydrophobic interactions similar to surfactant aggregation in the bulk solution. ,,− ,− ,, Depending on the systems studied, classical bilayer or globular associates have been proposed as the structure of the surface aggregates. In the case of graphite, ,− , on the other hand, the first step is a high-affinity adsorption, which is again exothermic but effectively irreversible, leading to a surface coverage of about one close-packed layer of molecules, oriented with their long axes parallel to the surface. The second stage of adsorption is athermal or endothermic, but there is some debate concerning what actually happens in this region.…”

“…The second stage of adsorption is athermal or endothermic, but there is some debate concerning what actually happens in this region. A gradual transition from a horizontal monolayer to a vertical monolayer, ,− , the formation of three-dimensional associates, like half-micelles, , or the formation of subsequent layers on top of the preceding layer (parallel bilayer or multilayer) 8 have been proposed to occur.…”

“…Measurements of adsorption isotherms and calorimetric determinations of the enthalpies of adsorption of alkyl polyoxyethylenes, [1][2][3][4][5][6][7][8][9][10] alkylbenzene polyoxyethylenes, [11][12][13][14][15][16][17][18][19][20][21][22][23] and alkylsulfinylalkanols 24 from aqueous solutions onto silica [1][2][3][4][11][12][13][14][15][16][17][18][19][20][21][22][23] and graphitized carbon black 2,[5][6][7][8][9][10]24 exemplify the significant differences between the adsorption behavior of nonionic surfactants on hydrophilic and hydrophobic solid surfaces.…”

“…3,4,[11][12][13][14][16][17][18]22,23 Depending on the systems studied, classical bilayer or globular associates have been proposed as the structure of the surface aggregates. In the case of graphite, 2,[5][6][7][8][9][10]24 on the other hand, the first step is a high-affinity adsorption, which is again exothermic but effectively irreversible, leading to a surface coverage of about one close-packed layer of molecules, oriented with their long axes parallel to the surface. The second stage of adsorption is athermal or endothermic, but there is some debate concerning what actually happens in this region.…”

An Atom-economic and Facile Synthesis of Novel 4-Imino-3-phenyl-2- substitutedphenyl-5-tolyl-2H,3H,5H[1,2,5]thiadiazolidine-1-oxide through 1,3-Dipolar Cycloaddition Reactions

“…For the present study, dienophile with cumulative double bond N-sulphinyl-4-toluidine has been used for these cycloaddition reactions. N-sulphinyl-4-toluidine has been synthesized from pure (AR) grade p-toluidine which was further purified by recrystallisation and using doubly distilled thionyl chloride as reported in literature [17]. The N-sulphinyl-4-toluidine so obtained was dried over anhydrous sodium sulphate for an overnight period and this was used after distillation in vacuo for these cycloaddition reactions with the N-α-cyanoamines.…”