Structural and interactional studies of homologous series of α,ω-alkanediols in N,N-dimethylformamide

Molecular interactions of α,ω-alkanediols in pyrrolidin-2-one: Thermophysical and spectroscopic measurements

“…These results denote a strong dependence of the V E values on both the diol chain length and the nature of the amide, as can be inferred from the noticeably different results reported for the binary mixtures of the same diols with DMF [18]. The V E values of a,x-alkanediols in DMF are negative for all the mixtures reveal that DMF interacts strongly with the same diols than with PY in which the disruption of PY dimmers [15,23,24] through breaking of hydrogen bonds result in an increase in volume.…”

“…In recent papers, we have reported thermophysical and spectroscopic studies for the mixtures of alkanediols (isomeric butanediols and a,x-alkanediols) with amides (N,Ndimethylformamide and pyrrolidin-2-one) [16][17][18]. As a continuation of our earlier communications, the excess molar volumes V E , speed of sound u, viscosity g, i.r.…”

“…These results show that 1,3-PPD and 1,4-BTD form more compressible species with PY than 1,2-ED and 1,5-PTD. The K E S values of the same diols in DMF [18] are more negative in comparison with PY. A comparative analysis of K E S values shows that DMF forms more compressible species with a,x-alkanediols than with PY.…”

“…The partial molar volumes V E i for mixtures of (diols + PY) are shown in figure 3 (5) and standard deviation r of {x a,x-alkanediols + (1 À x) PY} at T = 308.15 K However, V E i values are large and negative for all the mixtures of (diols + DMF) and vary as 1,2-ED < 1,3-PPD < 1,4-BTD < 1,5-PTD [18]. A competitive study of V E i values reveals that for short-chain diols, the existence of strong hydrogen bonding through C@OÁ Á ÁH-O between the more polar DMF and the two hydroxyl groups on the diols causes a decrease in volume.…”

“…for liquid binary mixtures of a,xalkanediols {1,2-ethanediol (ED), 1,3-propanediol (PPD), and 1,5-pentanediol (PTD)} and pyrrolidin-2-one (PY) have been determined in the present report. Several related parameters were estimated and are discussed in comparison with (a,x-alkanediols + N,N-dimethylformamide) (DMF) mixtures reported earlier [18]. The aim of this work is to obtain information about structural and interactional studies of progressive addition of methylene groups in the series of a,x-alkanediols in pyrrolidin-2-one.…”