Hydrates of organic compounds. XIII. The confirmation of the formation of clathrate-like hydrates of tetrabutylammonium and of tetraisopentylammonium polyacrylates.
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概要
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A thermal analytic method using a differential scanning calorimeter has been applied to aqueous solutions of a series of tetraalkylammonium polyacrylates ((R<SUB>4</SUB>NOOCCHCH<SUB>2</SUB>)<I><SUB>n</SUB></I>; R=CH<SUB>3</SUB>, C<SUB>2</SUB>H<SUB>5</SUB>, <I>n</I>-C<SUB>3</SUB>H<SUB>7</SUB>, <I>n</I>-C<SUB>4</SUB>H<SUB>9</SUB>, <I>n</I>-C<SUB>5</SUB>H<SUB>11</SUB>, and <I>i</I>-C<SUB>5</SUB>H<SUB>11</SUB>). It was found that only tetrabutylammonium polyacrylate and tetraisopentylammonium polyacrylate could form stable hydrates having a large number of moles of water per single R<SUB>4</SUB>NOOCCHCH<SUB>2</SUB> unit of the polyacrylates (hydration numbers). The melting points and hydration numbers of these two hydrates were 11.2 °C, 30±1 for the tetrabutylammonium polyacrylate hydrate and 19.5 °C, 42±2 for the tetraisopentylammonium polyacrylate hydrate, respectively. Judging from the melting points, hydration numbers, and the concentration dependence of the dissolution temperatures, these hydrates were regarded as clathrate-like. The tetrabutylammonium polyacrylate hydrate seems to be iso-structural with (<I>n</I>-C<SUB>4</SUB>H<SUB>9</SUB>)<SUB>4</SUB>NF hydrate and the tetraisopentylammonium polyacrylate hydrate with (<I>i</I>-C<SUB>5</SUB>H<SUB>11</SUB>)<SUB>4</SUB>NF hydrate.
- 公益社団法人 日本化学会の論文
著者
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Nakayama Haruo
Department of Applied Chemistry, Faculty of Engineering, Yokohama National University
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