The N,N-dimethylformamide/ethane-1,2-diol solvent system. Density, viscosity, and excess molar volume at various temperatures

Marchetti, Andrea; Preti, Carlo; Tagliazucchi, Mara; Tassi, Lorenzo; Tosi, Giuseppe

doi:10.1021/je00004a005

Cited by 78 publications

(55 citation statements)

References 7 publications

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“…Viscosity values for pure glycols in the present work agree with the literature data [1, [3][4][5] within 10% except for those DEG obtained for DEG by Kumagai et al [~1] and, for TEG by Obermeier et al [3] as shown in Fig. 2.…”

Section: Resultssupporting

confidence: 92%

Revised viscosities for HFC-134a + glycol mixtures from 273 to 333 K

1994

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The liquid viscosity of six binary mixtures of HFC-134a with glycols l-ethylene glycol, diethylene glycol, triethylene glycol, tetraethylene glycol, polyethylene glycol(400), and polypropylene glycol (2000)] was measured in the temperature range from 273 to 333 K. The viscosity was measured with an improved capillary viscometer instead of the rolling-ball viscometer reported in our previous work. The measurement uncertainty was estimated to be 1.6%. Most of the present data are higher than previous data, and the gap between the two sets of data increases further in low-viscosity regions. The present results obtained with laminar flow are more reliable than previous results, which are indefinite because of the limit of usefulness of the rolling-ball viscometer in low-viscosity regions.

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Section: Resultssupporting

confidence: 92%

Revised viscosities for HFC-134a + glycol mixtures from 273 to 333 K

1994

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“…This work a Literature This work Literautre (47) 277 (48) 0.9466 (13) 298. 15 0.942915 0.943286 (49) 1.104264 1.104362 0.944061 (40) 0.945597 (48) 303.…”

Section: Densitiesmentioning

confidence: 99%

“…15 0.942915 0.943286 (49) 1.104264 1.104362 0.944061 (40) 0.945597 (48) 303. 15 0.938876 0.939376 (40) 1.103031 b 1.103142 0.940691 (48) 308. 15 0.933964 0.934402 (40) 1.101492 1.101631 0.935814 (48) 313.…”

Section: Densitiesmentioning

confidence: 99%

“…15 0.938876 0.939376 (40) 1.103031 b 1.103142 0.940691 (48) 308. 15 0.933964 0.934402 (40) 1.101492 1.101631 0.935814 (48) 313. 15 0.929549 0.929860 (40) 1.099641 b 1.099867 0.931030 (48) 318.15 0.924674 0.92502 (40) 1.097560 1.097864 0.926282 (48) a The water content of pure DMF was taken into account and the densities were extrapolated to x(DMF) = 1.0000. b Calculated from the temperature dependence of density.…”

Section: Densitiesmentioning

confidence: 99%

“…15 0.933964 0.934402 (40) 1.101492 1.101631 0.935814 (48) 313. 15 0.929549 0.929860 (40) 1.099641 b 1.099867 0.931030 (48) 318.15 0.924674 0.92502 (40) 1.097560 1.097864 0.926282 (48) a The water content of pure DMF was taken into account and the densities were extrapolated to x(DMF) = 1.0000. b Calculated from the temperature dependence of density. association would not exist also in the (D 2 O + DMF) binary system, especially thinking of the closely similar characteristics of liquid H 2 O and D 2 O.…”

Section: Densitiesmentioning

confidence: 99%

See 2 more Smart Citations

Volumetric properties of binary mixtures of N, N- dimethylformamide with water or water- d2 at temperatures from 277.13 K to 318.15 K

Scharlin

Steinby

Domańska

2002

The Journal of Chemical Thermodynamics

102

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Photoisomerization of linear merocyanines in salt solutions

Tan

Chen

2023

J Chinese Chemical Soc

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The trans-cis isomerization in the excited state of linear merocyanine L-Mero4 and phenyl substituted linear merocyanine P-L-Mero4 in salt solution and in ionic liquid was investigated using frequency upconversion measurements.Strontium chloride and cesium iodide were added to solvent dimethyl sulfoxide (DMSO) and dimethylformamide (DMF) to vary the ionic strength. The time-resolved fluorescence curves of merocyanines displayed multiple exponential decay behavior. The second temporal component with time constant τ 2 ≈ 2.8 (11) ps of L-Mero4 (P-L-Mero4) in DMSO was assigned to the duration to reach the isomerization equilibrium between the trans and the twisted conformers. The τ 2 increased at higher salt concentrations and was explained by the attachment of salt ions on the polar excited merocyanines decelerating the isomerization rate. The rotational correlation time constants obtained from the anisotropy decay of fluorescence were 360 and 240 ps in neat DMSO for L-Mero4 and P-L-Mero4, respectively, and they increased to 790 and 450 ps in the most concentrated SrCl 2 . Using Perrin relation, we estimated the increase in the rotating volume at [SrCl 2 ] = 536 mM, revealing ≈15 SrCl 2 molecules surrounding L-Mero4 and 7 SrCl 2 on P-L-Mero4. The experimental data indicated that the ion-molecule interaction was stronger with SrCl 2 and on L-Mero4 than on P-L-Mero4.

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The N,N-dimethylformamide/ethane-1,2-diol solvent system. Density, viscosity, and excess molar volume at various temperatures

Cited by 78 publications

References 7 publications

Revised viscosities for HFC-134a + glycol mixtures from 273 to 333 K

Revised viscosities for HFC-134a + glycol mixtures from 273 to 333 K

Volumetric properties of binary mixtures of N, N- dimethylformamide with water or water- d2 at temperatures from 277.13 K to 318.15 K

Photoisomerization of linear merocyanines in salt solutions

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