HYDRATES OF ORGANIC COMPOUNDS. XV, THE FORMATION OF CLATHRATE-LIKE HYDRATES OF TETRAISOPENTYLAMMONIUM ALKANOATES AND ALKANEDIOATES

The solid-liquid phase diagrams of binary mixtures of water with tetraisopentylammonium alkanoates, [(i-C5H11)4N]CnH2n+1COO (n=0–9), and with bis(tetraisopentylammonium) alkanedioates, [(i-C5H11)4N]2-[OOC(CH2)nCOO] (n=0–10), were examined in order to confirm the formation of clathrate-like hydrates. The results are summarized as follows: (1) For all the compounds examined the formation of a clathrate-like hydrate is newly confirmed; (2) the melting points of these hydrates are fairly high (lie between 10 and 28°C); (3) typical hydrates formed by the alkanoates have hydration numbers around 38 and those formed by the alkanedioates around 80; and (4) hydrates with hydration numbers around 14 and larger than 40 are also found for the alkanoate hydrates and around 30 and larger than 80 for the alkanedioate hydrates. The effects of the alkyl chain length of the alkanoate anion and of the methylene chain length of the alkanedioate anion on the stability of the hydrates are not marked, suggesting that a hydrogen...

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