Tetraalkylammonium ions capacities

The ACp (I, W -> S) can be readily calculated from these data, with the uncertainties borne in mind. Correlation expressions for the large tetraalkylammonium ions, relating the C (I, W or S) linearly to number of carbon atoms of the ions were presented by Abraham and Marcus [45 ]. The molar heat capacity change of solvation... 

S.2.4 Ionic Heat Capacities in Nonaqueous Solvents The standard molar ionic heat capacities in water of the alkali metal, halide, perchlorate, tetraalkylammonium, and tenaphenylonium salts are reported in Table 2.8 and also by Abraham and Marcus [45], based on the TPTB assumption. Based on the same assumption, their C" (I, S) in S=MeOH, EtOH, 1-PrOH, PC, NMF, DMF, MeCN, MeNO, and DMSO are reported by Marcus and Hefter [46]. The reservation expressed in Section 2.3.1.1, that slight differences in the sizes and induced partial charges in the phenyl rings cause a large uncertainty in equating the TPTB ions, applies also to the nonaqueous solutions. The values of C (I, S) are listed as far as available in Table 4.5. 

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