Partial molal volumes of amines in benzene. Specific interactions

1986 ◽  
Vol 64 (2) ◽  
pp. 387-393 ◽  
Author(s):  
Ester F. G. Barbosa ◽  
Isabel M. S. Lampreia
Keyword(s):  
Specific Interaction ◽  
Secondary Amines ◽  
Partial Molal Volume ◽  
Tertiary Amines ◽  
Molal Volume ◽  
Conformational Effects ◽  
Partial Molal Volumes ◽  
Amine Groups ◽  
Vibrating Tube Densimeter ◽  
Molal Volumes

Apparent molal volumes, [Formula: see text], of secondary and tertiary amines and linear hydrocarbons were determined in benzene at 25 °C, using a vibrating tube densimeter. These quantities have been extrapolated to infinite dilution to obtain partial molal volumes. The contribution to partial molal volume of the amine groups, calculated using a simple additive scheme, [Formula: see text], were interpreted in terms of conformational effects present in these molecules. A first attempt to find a measure of the contribution to the partial molal volume of the specific interaction amine–benzene in tertiary and secondary amines was made. The results agree well in the two different approaches used.

Partial molal volume behavior of tetraalkylammonium chlorides in aqueous acetone and aqueous dimethylsulfoxide

1970 ◽  
Vol 48 (15) ◽  
pp. 2416-2422 ◽  
Author(s):  
Digby D. Macdonald ◽  
J. B. Hyne
Keyword(s):  
Molecular Weight ◽  
Aqueous Acetone ◽  
Solvent Composition ◽  
Partial Molal Volume ◽  
Volume Data ◽  
Molal Volume ◽  
Partial Molal Volumes ◽  
Molal Volumes ◽  
Aqueous Dimethylsulfoxide ◽  
Linear Expression

The partial molal volumes of a series of tetraalkylammonium chlorides in aqueous acetone and aqueous dimethylsulfoxide at 25.000 °C are reported as a function of solvent composition. It is shown that for each solvent composition the partial molal volume data are better represented by a quadratic in solute molecular weight than by the linear expression previously employed in similar studies. Extrapolation of molecular partial molal volumes to zero cation molecular weight has permitted evaluation of the partial molal volumes of the ions R4N+ and Cl−. The variation of molecular and ionic partial molal volume as a function of solvent composition is discussed.

scholarly journals The partial molal volume of two nickel chelate complexes

1980 ◽  
Vol 58 (17) ◽  
pp. 1795-1798 ◽  
Author(s):  
Y. K. Sze ◽  
W. A. E. McBryde
Keyword(s):  
Ethylenediaminetetraacetic Acid ◽  
Structural Features ◽  
Partial Molal Volume ◽  
Spectral Measurements ◽  
Chelate Complexes ◽  
Molal Volume ◽  
Nickel Chelate ◽  
Partial Molal Volumes ◽  
Molal Volumes ◽  
Methyliminodiacetic Acid

Partial molal volumes have been determined for the nickel(II) complexes of ethylenediaminetetraacetic acid (mono complex) and methyliminodiacetic acid (bis complex). The formation of these is accompanied by appreciable increases in volume, greater in the case of the second ligand. The observations are discussed in terms of reduced electrostriction of water by the complexes, and the different volume increases are accounted for by structural features of the complexes which are partially confirmed by spectral measurements.

Effect of Pressure on the Solvolysis of Dimethyl-t-butyl Sulfonium Iodide in Ethanol–Water Mixtures

1972 ◽  
Vol 50 (14) ◽  
pp. 2270-2275 ◽  
Author(s):  
Claude S. Davis ◽  
J. B. Hyne
Keyword(s):  
Reaction Mechanism ◽  
Transition State ◽  
Pressure Dependence ◽  
Composition Dependence ◽  
Partial Molal Volume ◽  
Molal Volume ◽  
Effect Of Pressure ◽  
Partial Molal Volumes ◽  
Molal Volumes

The pressure dependence of the rate of solvolysis of dimethyl-t-butyl sulfonium iodide has been studied in ethanol–water mixtures at 60.00 °C. Determination of the partial molal volume of the substrate ions has enabled the volumes of activation to be dissected into initial and transition state components. The solvent composition dependence of the partial molal volumes of the two states provides further details of the nature of the reaction mechanism.

Partial molal volumes of organic compounds in carbon tetrachloride. 1. Alkanes: conformational effects

1978 ◽  
Vol 82 (21) ◽  
pp. 2310-2313 ◽  
Author(s):  
John T. Edward ◽  
Patrick G. Farrell ◽  
Fereidoon Shahidi
Keyword(s):  
Carbon Tetrachloride ◽  
Organic Compounds ◽  
Conformational Effects ◽  
Partial Molal Volumes ◽  
Molal Volumes

Partial molal volumes of calcium-montmorillonite

Clay Minerals ◽  
1971 ◽  
Vol 9 (2) ◽  
pp. 177-184 ◽  
Author(s):  
E. A. Ferreiro ◽  
A. K. Helmy
Keyword(s):  
Silica Gel ◽  
Alcohol Concentration ◽  
Apparent Molal Volume ◽  
Surface Charges ◽  
Molal Volume ◽  
Density Measurements ◽  
Partial Molal Volumes ◽  
Molal Volumes ◽  
Low Alcohol

AbstractPartial molal voltmae of Ca-montmorillonite, apparent molal volume of silica gel in water and of Ca-montmorillonite in ethanol-water mixtures, were determined using pycnometer density measurements. No electrostriction of water was observed with silica gel but took place in Ca-montmorillonite thus indicating the principle role of surface charges in stricting water. In ethanol-water mixtures alcohol molecules were salted out at low alcohol concentration, but they started reaching inner zones near the clay surfaces when their mole fraction in solution was increased beyond the value of 0·55.

Reaction of arylmethylenemalonaldehydes with some nucleophiles

1987 ◽  
Vol 52 (11) ◽  
pp. 2699-2709 ◽  
Author(s):  
Dalimil Dvořák ◽  
Zdeněk Arnold
Keyword(s):  
Inorganic Anions ◽  
Secondary Amines ◽  
Tertiary Amines ◽  
Primary And Secondary Amines ◽  
Dipolar Structure

Reaction of arylmethylenemalonaldehydes with tributylphosphine and tertiary amines affords compounds of dipolar structure whereas reaction with primary and secondary amines leads to 1,4-addition products. Salts of nucleophilic inorganic anions add to arylmethylenemalonaldehydes under formation of salts of substituted malonaldehydes.

Partial Molal Volumes of Aqueous Ions

1957 ◽  
Vol 61 (10) ◽  
pp. 1426-1429 ◽  
Author(s):  
Loren G. Hepler
Keyword(s):  
Partial Molal Volumes ◽  
Aqueous Ions ◽  
Molal Volumes
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