Shear viscosities of binary mixtures of pyrrolidin-2-one with C₆–C₁₀n-alkan-1-ols

The N-methylpyrrolidone–(C1–C10) alkan-1-ols solvent systemsElectronic Supplementary Information (ESI) available: Properties of pure components, densities, viscosities and refractive indices of mixtures NMP(1) + alkan-1-ols(2) at 298.15 K (Tables S1–S4). See http://www.rsc.org/suppdata/cp/b1/b109709c/

“…3) supports a higher ability to form H-bond associates; in contrast, the NMP-water mixtures displayed a minimum around x 1 ¼ 0.1 in the V ¯E m;NMP vs. x 1 plots, a result justified by the formation of icelike structures. 8 The partial molar volume at infinite dilution V ¯E;1 m;NMP for NMP-methanol mixtures is much lower compared to pure NMP (V m,NMP ¼ 96.40 cm 3 mol À1 ); an increase in chain length is accompanied by an increase in V ¯1 m;NMP (96.54 cm 3 mol À1 for octan-1-ol). This property was strongly negative for NMPmethanol, and increased with the alcohol chain length, reaching a maximum for octan-1-ol.…”

“…2 For decades, the challenge of the petroleum industry has been to find selective solvents with good ability for phase separation in extractive distillations; NMP, with a high boiling point (475 K) and relaxation characterized by only one Debyetype spectral component, 3 represents quite a simple model for rigid, non-associating polar species (dipole moment m 30 C ¼ 4.09 D); due to its ability to modify the potential reactivity of reacting states in electron and proton transfer reactions, NMP is also widely used in settings such as solventreactivity relationships. [4][5][6][7][8][9][10][11] Alkanols are polar liquids, strongly self-associated by hydrogen bonding to extents of polymerization that may differ depending on temperature, chain length, and position of the OH group. Although some authors suggest self-association in terms of monomer-dimer equilibria, 12,13 others propose that dimers and higher oligomers are also important in dilute solutions; 14 pure methanol may exist mainly as a cyclic dimer, with contributions ranging from open dimers to trimers, whereas ethanol may exist mainly as a trimer complex species.…”

Effect of placement of hydroxyl groups in isomeric butanediol on the behaviour of thermophysical and spectroscopic properties of pyrrolidin-2-one

“…Cyclic amides are interesting compounds in which the nitrogen and carbon of a peptide bond are linked by a ring composed of methylene groups. These amide functional groups [17][18][19][20] are structural part of peptide, polypeptide and proteins and constitute an important tool in the interpretation of numerous problems of molecular biology.…”

Viscometric Studies of Binary Mixtures of Ethyl Acetoacetate with (C4-C9) Aliphatic Ketones at 298.15 K

“…Thus, the authors suggested that positive values of ∆G *E indicate that the flow of binary mixtures is more difficult when compared to that of pure solvents.The observed positive values of ∆G *E in the binary mixtures of EAA + butan-2-one, EAA + pentan-2-one, EAA + hexan-2-one, EAA + heptan-2-one, EAA + octan-2-one and EAA + nonan-2-one are indicative of strong dipole-dipole interactions between ethyl acetoacetate molecules and the named aliphatic ketones. Leal et al [31,32] made similar observations in their studies of binary mixtures of pyrrolidin-2-one with (C 6 -C 10 ) alkan-1-ols.…”