Hamaguchi Tomohiko, Iseki Yuudai, Ishikawa Ryuta, Mishima Akio, Kawata Satoshi
Department of Chemistry, Faculty of Science, Fukuoka University, 8-19-1 Nanakuma, Jonan-ku, Fukuoka 814-0180, Japan.
Molecules. 2024 Dec 12;29(24):5858. doi: 10.3390/molecules29245858.
In this article, we investigate the encapsulation of K[Ni(maleonitriledithiolate)] () within a host molecule, β-cyclodextrin (β-CD), via single-crystal X-ray analysis. An inclusion complex, K{[Ni(maleonitriledithiolate)]@(β-CD)} (), was constructed from and two β-CDs. The anion guest Ni complex included a host cavity, constructed using two β-CDs, and the Ni atom of the anion was located between the two hydrophilic primary rims. Ultraviolet-visible absorption spectroscopy revealed that inclusion complex exhibited a 2:1 (host:guest) stoichiometry in the solution, which is consistent with the result obtained from X-ray crystallography. The association of the host and guest occurred in two steps, and the association constants for the first and second steps were 1.1(7) × 10 and 1.8(5) × 10 mol dm, respectively. The catalytic behavior of and was investigated for electrochemical hydrogen production in the aqueous solution of an acetate buffer (pH = 4.72). During the catalytic reaction, inclusion complex was observed to have a better catalytic reaction rate than . The study findings provide insights into the effects of the encapsulation of guest molecules within host structures.
在本文中，我们通过单晶X射线分析研究了K[Ni(马来二腈二硫醇盐)]（）在主体分子β-环糊精（β-CD）中的包封情况。一种包合物K{[Ni(马来二腈二硫醇盐)]@(β-CD)}（）由和两个β-CD构建而成。阴离子客体镍配合物包含一个由两个β-CD构建的主体空腔，阴离子的镍原子位于两个亲水性主边缘之间。紫外可见吸收光谱表明，包合物在溶液中呈现2:1（主体:客体）的化学计量比，这与X射线晶体学得到的结果一致。主体与客体的缔合分两步进行，第一步和第二步的缔合常数分别为1.1(7)×10和1.8(5)×10 mol dm。研究了和在醋酸盐缓冲液（pH = 4.72）水溶液中电化学产氢的催化行为。在催化反应过程中，观察到包合物的催化反应速率比更好。研究结果为深入了解客体分子在主体结构中的包封效应提供了依据。
