Hydrates of Organic Compounds. VIII. The Effect of Carboxylate Anions on the Formation of Clathrate Hydrates of Tetrabutylammonium Carboxylates
Hydrates of Organic Compounds. VIII. The Effect of Carboxylate Anions on the Formation of Clathrate Hydrates of Tetrabutylammonium Carboxylates
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有机化合物的水合物。
DOI：
10.1246/bcsj.57.171
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发表时间：
1984
影响因子：
4
通讯作者：
Shigeru Torigata
中科院分区：
文献类型：
--
作者：
H. Nakayama;Shigeru Torigata
研究了四丁基羧酸铵(n-C4H9)4-NOOCR(R=H-n-C10H21，含有不同的烷基被甲基或乙基取代)与水的二元混合物的固液相图，以确定形成了笼状水合物。结果表明：(1)新确认了14种羧酸盐形成笼状水合物；(2)从熔点和水化数判断，水合物可分为I、II和III三类：(3)由R=H、CH3、C2H5、n-C3H7、I-C3H7和t-C4H9的羧酸盐形成的I类水合物，水化数在30左右，是本实验考察的水合物中最稳定的，2-甲基丙酸酯和2，2-二甲基丙酸酯水合物除外；(4)第II族水合物由R=n-C4H9、S-C4H9、I-C4H9和全部C5H11的盐类组成，水化数在39左右，且相对不稳定(熔点=5~11℃)；
The solid-liquid phase diagrams of binary mixtures of tetrabutylammonium carboxylates, (n-C4H9)4 NOOCR (R=H-n-C10H21 including various alkyl groups replaced by either methyl or ethyl group), with water were examined in order to confirm the formation of clathrate-like hydrates. The results can be summarized as follows: (1) for 14 carboxylates the formation of a clathrate-like hydrate is newly confirmed; (2) judging from melting points and hydration numbers, the hydrates can be classified into three groups: I, II, and III; (3) the group I hydrates, formed by the carboxylates with R=H, CH3, C2H5, n-C3H7, i-C3H7, and t-C4H9, have hydration numbers around 30 and are the most stable hydrates among those examined in this experiment, with the exceptions of 2-methylpropionate and 2,2-dimethylpropionate hydrates; (4) the group II hydrates, with hydration numbers around 39, are formed by the salts with R=n-C4H9, s-C4H9, i-C4H9, and all the C5H11, and are relatively unstable (mp=5–11 °C); (5) the group III hydrates, ...