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preface to fifteenth edition

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PHYSICAL PROPERTIES 5.105<br />

TABLE 5.17<br />

Dielectric Constant (Permittivity) and Dipole Moment of Various Organic Substances<br />

The temperature in degrees Celsius at which the dielectric constant and dipole moment were measured is shown<br />

in this table in parentheses after the value. In some cases, the dipole moment was determined with the substance<br />

dissolved in a solvent, and the solvent used is also shown in parentheses after the temperature.<br />

The dielectric constant (permittivity) tabulated is the relative dielectric constant, which is the ratio of the<br />

actual electric displacement <strong>to</strong> the electric field strength when an external field is applied <strong>to</strong> the substance, which<br />

is the ratio of the actual dielectric constant <strong>to</strong> the dielectric constant of a vacuum. The table gives the static<br />

dielectric constant , measured in static fields or at relatively low frequencies where no relaxation effects occur.<br />

The dipole moment is given in debye units D. The conversion fac<strong>to</strong>r <strong>to</strong> SI units is 1 D 3.33564 <br />

1030<br />

C · m.<br />

Alternative names for entries are listed in Table 1.15 at the bot<strong>to</strong>m of each double page.<br />

List of Abbreviations<br />

B, benzene g, gas<br />

C, CCl 4 Hx, hexane<br />

cHex, cyclohexane lq, liquid<br />

D, 1,4-dioxane<br />

Substance Dielectric constant, Dipole moment, D<br />

Acetaldehyde 21.8 (10), 21.0 (18) 2.75<br />

Acetaldehyde oxime 4.70 (25) 0.830 (20, lq), 0.90 (25, B)<br />

Acetamide 67.6 (91) 3.76<br />

Acetanilide 3.65 (25, B)<br />

Acetic acid 6.20 (20) 1.70<br />

Acetic anhydride 23.3 (0), 22.45 (20) 2.8<br />

Ace<strong>to</strong>ne 21.0 (20), 20.7 (25), 17.6 (56) 2.88<br />

Ace<strong>to</strong>nitrile 36.64 (20), 26.6 (82) 3.924<br />

Ace<strong>to</strong>phenone 17.44 (25), 8.64 (202) 3.02<br />

()-erythro-2-Ace<strong>to</strong>xy-2-bromobutane<br />

7.268 (25)<br />

()-threo-2-Ace<strong>to</strong>xy-2-bromobutane 7.414 (25)<br />

Acetyl bromide 16.2 (20) 2.43 (20, B)<br />

Acetyl chloride 16.9 (2), 15.8 (22) 2.72<br />

Acetylene<br />

2.484 (77)<br />

Acrylonitrile 33.0 (20) 3.87<br />

Allene<br />

2.025 (4)<br />

Allylamine 1.2<br />

Allyl alcohol 19.7 (20) 1.61<br />

Allyl isocyanate 15.15 (15)<br />

Allyl isothiocyanate 17.2 (18) 3.2 (20, B)<br />

Allyl nitrite 9.12 (25)<br />

2-Aminoethanol 31.94 (20), 37.72 (25) 2.59 (25, D)<br />

2-(2-Aminoethylamino)ethanol 21.81 (20)<br />

N-(2-Aminoethyl)-1,2-ethanediamine<br />

12.62 (20) 1.9<br />

Aniline 7.06 (20), 5.93 (70) 1.13<br />

Benzaldehyde 19.7 (0), 17.85 (20) 3.0<br />

Benzaldehyde oxime (mp 30) 3.8 (20) 1.2 (25, B)<br />

(mp 128) 1.5 (25, B)<br />

Benzamide 3.42 (25, B)<br />

Benzene 2.292(15), 2.283 (20), 2.274 (25) 0<br />

Benzeneace<strong>to</strong>nitrile 17.87 (26) 3.5<br />

Benzenesulfonyl chloride 28.90 (50) 4.50 (20, B)<br />

Benzenethiol 4.38 (25), 4.26 (30) 1.13 (25, lq), 1.19 (20, B)<br />

Benzonitrile 25.9 (20), 24.0 (40) 4.18<br />

Benzophenone 14.60 (18), 11.4 (50) 3.09 (50, lq), 2.98 (25, B)

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