Dipole moments have been calculated for all members of the chloroethane series, using charge distributions based on the semiempirical method of Smith, Eyring, and coworkers. In the case of chloroethane, 1,1-
Dielectric constants at 20, 30, 40, and 50°C have been determined for pure liquid dimethylsiloxane oligomers (CH3)3Si-[OSi(CH3hJxOSi(CH3la having chain lengths corresponding to x=3, 5, 7, and 9. Mean-square dipole moments (}In, calculated from the Onsager equation, are in good agreement with predicted values based on a rotational isomeric state model with neighbor dependence and chain conformational energies obtained in an independent analysis of the random-coil dimensions of such chains. In addition, the observed temperature coefficients of (}J.2) are in qualitative agreement with calculated results for the stated range of x. An experimental value of the ratio (}J.2 )/nm 2 (where n is the number of bond dipoles, each of magnitude m) in the limit of large x is estimated from published data on the pure liquid polymer at 25°C. This tentative result is in fair agreement with theory; agreement is improved if the large specific solvent effect previously observed for this polymer is interpreted as being primarily due to the effect of the dielectric constant of the medium on the Coulombic contribution to the conformational energy.
SHmmary Pentacyanocobaltate(11) ion and hexacyanodinickelate(1) ion react with organic azides in water to liberate nitrogen and form metal amido-complexes, benzamidobis [pentacyanocobaltate(m) ] ion.
Furoylazid (I) und das Pentacyanokobaltation (II) reagieren bei 0°C in eine Äthanol/Wasser‐Gemisch unter Bildung des Metallamidokomplexes (III) un Stickstoff (IV).
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