Sada Kazuki, Inoue Katsunari, Tanaka Tomoyuki, Tanaka Akira, Epergyes Attila, Nagahama Sadamu, Matsumoto Akikazu, Miyata Mikiji
Department of Chemistry and Biochemistry, Graduate School of Engineering, Kyushu University, 6-10-1 Hakozaki, Higashi-ku, Fukuoka 812-8581, Japan.
J Am Chem Soc. 2004 Feb 18;126(6):1764-71. doi: 10.1021/ja038379n.
A series of 1-naphthylmethylammonium n-alkanoates from acetate to triacontanoate produce isomorphic layered structures in the crystalline state. The interlayer distances, d-spacings, are proportional to the lengths of the alkyl chains. This is attributed to synergic intermolecular interactions; pi-pi and CH-pi interactions of the naphthalene rings between the cations, hydrophobic interactions of the alkyl chains, and two-dimensional hydrogen-bond networks between the primary ammonium cations and the carboxylate anions. Salts made from carboxylic acids wider than 5.5 A in the cross sections produce another columnar structure with a one-dimensional ladder-type hydrogen-bond network. Steric parameters of the acid components provide an explanation for the isomerism of the hydrogen-bond network.
一系列从乙酸酯到三十烷酸酯的1-萘甲基铵正链烷酸酯在结晶状态下产生同构层状结构。层间距离，即d间距，与烷基链的长度成正比。这归因于协同分子间相互作用；阳离子之间萘环的π-π和CH-π相互作用、烷基链的疏水相互作用以及伯铵阳离子与羧酸根阴离子之间的二维氢键网络。由横截面宽度大于5.5 Å的羧酸制成的盐产生另一种具有一维梯型氢键网络的柱状结构。酸组分的空间参数为氢键网络的异构现象提供了解释。
