Handbook of Solvents - George Wypych - ChemTech - Ventech!

42 Koichiro Nakanishi
Figure 2.2.2. Hammond-Stokes plot for diffusion of iodine and carbon tetrachloride in various solvents at
298.15K. o, :D 1η 2,:(D 1) selfη 2, :D 1η 2at the Stokes-Einstein limit. Perpendicular lines connect two or more
data for the same solvent from different sources. [Adapted, by permission, from K. Nakanishi, Bull. Chem. Soc. Japan,
51, 713 (1978).
where D 0 is in cm 2 s -1 .V Aand V B are the liquid molar volumes in cm 3 mol -1 ofAandBatthe
temperature T in K, and the factors I, S, and A are given in original publications, 4,6 and η is
the solvent viscosity, in cP.
Should the pure solute not be a liquid at 298 K, it is recommended that the liquid volume
at the boiling point be obtained either from data or from correlations. 4 Values of D 0
were estimated for many (149) solute-solvent systems and average error was 9.1 %.
2.3 BASIC PHYSICAL AND CHEMICAL PROPERTIES OF SOLVENTS
George Wypych
ChemTec Laboratories, Inc., Toronto, Canada
This section contains information on the basic relationships characterizing the physical and
chemical properties of solvents and some suggestions regarding their use in solvent evaluation
and selection. The methods of testing which allow us to determine some of physical and
chemical properties are found in Chapter 15. The differences between solvents of various
chemical origin are discussed in Chapter 3, Section 3.3. The fundamental relationships in
this chapter and the discussion of different groups of solvents are based on extensive
CD-ROM database of solvents which can be obtained from ChemTec Publishing. The database
has 110 fields which contain various data on solvent properties which are discussed
below. The database can be searched by the chemical name, empirical formula, molecular
weight, CAS number and property. In the first case, full information on a particular solvent