Dielectric constants, viscosities, and related physical properties of several substituted liquid ureas at various temperatures

Rosenfarb, Joseph; Huffman, Hugh L.; Caruso, Joseph A.

doi:10.1021/je60069a034

Cited by 50 publications

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References 16 publications

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“…Recently 1,3-dimethylethyleneiirea (DMEU) has been investigated with regard t o somc of its fundamental properties (0) and to the behavior of electrolytes therein (7,8). It was found that DMEU is a solvent of high polarity (4.09 in dioxane) (9), moderately high dielectric constant (37.6 at 1 MHz) (6). and possesses good dissociative power towards electrolytes, comparable to that of hr-methyl-2-pyrrolidone and methanol.…”

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confidence: 99%

Nuclear magnetic resonance study of electrolytes in 1,3-dimethylethyleneurea

Rosenfarb¹,

Caruso²

1976

Can. J. Chem.

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JOSEPH ROSENFARB and JOSEPH A . CARUSO. Can. J. Chem. 54, 3492 (1976). A series of lithium, sotlium. potassium, and ammonium salts were investigated by proton magnetic resonance spectroscopy in 1,3-di1nethyIethylene~~rea. a relatively new non-aqueous solvent of high polarity and moderately high dielectric constant. The salts were found to shift the solvent proton peaks linearly as a function of salt concentration. Thiosulfate, perchlorate, and iodide salts shifted the solvent peaks downfield while tetraphenylborate salts uniquely shifted the peaks upfield indicating an ~~n u s u a l type of solvation behavior for the tetraphenyiborates in this solvent.JOSEPH ROSENFARB et JOSEPH A. CARUSO. Can. J. Chem. 54, 3192 (1976). On a CtudiC par rmil du proton dans la dimCt11y-1-1.3 ethylkne urke un solvant non aqueux relativement nouveau de haute polarit6 et de constante dieiectrique modCree, une sCrie de sels de lithium, de sodium, de potassium et d'ammonium. On a trouve que les sels dkplacent les signaux des protons du solvant d'une f a~o n lineaire en fonction de la concentration du sel. Les sels du thiosulfate. du perchlorate et de l'iodure deplacent les pics du solvant vers les bas champs alors que les sels du tCtraphinylborate sont les seuk B tiiplacer les pics vers les hauts champs; ces resultats indiquent un type particulier de colnportemene desolvatation des iCtraphenylborates dans ce solvant.[Traduit par le journal]Proton magnetic resonance which has been used to investigate the solvation behavior of ions in aqueous solutions (1-4) has bcen extended t o non-aqueous media as well (5). Recently 1,3-dimethylethyleneiirea (DMEU) has been investigated with regard t o somc of its fundamental properties (0) and to the behavior of electrolytes therein (7,8). It was found that DMEU is a solvent of high polarity (4.09 in dioxane) (9), moderately high dielectric constant (37.6 at 1 MHz) (6). and possesses good dissociative power towards electrolytes, comparable to that of hr-methyl-2-pyrrolidone and methanol. Particularl!~ interesting kvas the property that sodium and potassiu:~~ salts were isoconducting in DMEU (7). Therefore further study into the nature of solvation in DMEU was indicated.cipitates were thoroughly washed with deionized water, dried, and recrystallized from acetone with water portions. All salts were finely ground and dried in the appropriate manner (5, 7, 10).DMEU was freshly prepared as previously described (6) and had a specific conductance of about 5 X ohm-' ~111-1. MeasurenzetztsChemical shift data were obtained using a Varian A-60 nmr spectrometer. Tetramethylsilane ( 5 ' ; ) was used as an internal reference from which peak shifts were calculated. Since an internal reference was used. no bulk diamagnetic correctio~s were applied (11). Shift data were reproducible to t 0.3 Hz or 0.005 ppm.Results and Discussion A number of alkali halides, tetraalkylammonium salts, and multivalent salts have been investigated in aqueous solution (1,12). It was Experimentalobserved that a downfield (negative) shift of...

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confidence: 99%

Nuclear magnetic resonance study of electrolytes in 1,3-dimethylethyleneurea

Rosenfarb¹,

Caruso²

1976

Can. J. Chem.

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“…Alkan-1-ols are self-associated through hydrogen bonding and a DMI molecule interacts strongly with another DMI molecule through dipole-dipole interactions because of its high dipole moment: ca. 4.09 D (D % 3.335640952 AE 10 À30 C AE m) [1]. A mixing of DMI with an alkan-1-ol brings about not only the disruption of hydrogen bonding among alkan-1-ol molecules but also that of dipole-dipole interactions between two DMI molecules, which lead a positive contribution to volume.…”

Section: Resultsmentioning

confidence: 99%

“…1,3-Dimethylimidazolidin-2-one (DMI) is one of the cyclic ureas and a versatile dipolar aprotic solvent [1,2]. Limited studies on physical properties of pure DMI have been carried out and only two reviews on the properties are available in the literature [3,4].…”

Section: Introductionmentioning

confidence: 99%