The concentration dependence of the 13C spin-lattice relaxation times (T1) of the alkyl carbons in octyltrimethylammonium salts was analyzed by means of applying the phase separation model. At higher concentration, the 1/T1 value deviates from a linear plot and depends on the magnetic field strength. The molecular motions in monomer and micellar states are discussed, along with the overall motions of the molecule and its internal motion.
The conductance of tris(1,10-phenanthroline)iron(II) sulfate, Fe(phen)3SO4, and chloride, Fe(phen)3Cl2, has been measured in water-methanol mixed solvent at 25 °C. The data of the sulfate could be explained by means of the Fuoss-Onsager equation (1957) and the Fuoss-Onsager-Skinner equation (1965) on the assumption that the salt is completely dissociated in the entire composition range of the solvent system. Application of the Fuoss-Hsia equation which contains a c3⁄2 term gave association constants increasing from a value of KA=40 in water to KA=3900 in methanol. The logKA vs. 1/D plot is in good agreement with ion association theoreies. The limiting equivalent conductance of Fe(phen)32+ ion was estimated to be 34.3 in water and 62.3 in methanol.
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