Melting points, of compounds

Table 1 Corrected Melting Points of Compounds Suitable as Reference Materials in the Calibration of Thermometers...

Corrected melting points of compounds suitable as reference materials in the calibration of thermometers... 

Note (m) = melting point of metal, (M) = melting point of compound... 

The melting-points of compounds and eutectics are printed in heavy type, the corresponding compositions of the liquid phases in italics. Solid phases of uncertain composition are enclosed in brackets.]... 

TABLE 1. Comparison of Experimental and Calculated Melting Points of Compounds ... 

The melting points given in this and other tables were taken from [5]. The melting points of compounds, needed in the calculations,... 

Note. The melting points of compounds, needed in the calcu-... 

Comparison of melting point data of the neutral organic acids and of the cocrystals and salts discussed herein yields another interesting observation. As shown in Fig. 17, the melting points of compounds 1C3-1C9 follow a trend very similar to that of the acids, i.e. they show an alternation of melting points as a function of the even-odd carbon chain length. 

In summary, at room temperature malonic and glutaric adducts are salts adipic is ambiguous succinic, pimelic, suberic and azelaic adducts are co-crystals. Diffraction data and solid-state NMR data are in agreement except in the case of compound 1C6, which shows proton motion on the NMR time scale. Salt or co-crystals - does it matter The melting points of compounds 1C3-1C9 do not correlate with the saltlike or co-crystal nature of the adducts, but rather with the even-odd carbon chain length in spite of the substantial differences in supramolecular arrangements in the crystals of the adducts with respect to those of the parent diacids. 

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