Ke Hua, Liao Jian Zhen, Lu Can Zhong
Engineering Technology Research Center for Environmental Protection Materials and Equipment of Jiangxi Province, Jiangxi Key Laboratory of Industrial Ceramics, Pingxiang University, Pingxiang 337055, People's Republic of China.
Key Laboratory of Design and Assembly of Functional Nanostructures, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, People's Republic of China.
Acta Crystallogr C Struct Chem. 2019 Aug 1;75(Pt 8):1128-1133. doi: 10.1107/S2053229619009872. Epub 2019 Jul 12.
Noncovalent interactions, such as π-π stacking interactions, C-H...π interactions and hydrogen bonding, are important driving forces for self-assembly in the construction of functional supermolecules and materials, especially in multicomponent supramolecular systems. Herein, a novel compound based on a π-acidic naphthalene diimide derivative and a double hydroxide-bridged dinuclear Al aqua ion cluster, namely bis[N,N'-bis(2-sulfonatoethyl)-1,4,5,8-naphthalene diimide] di-μ-hydroxido-bis[tetraaquaaluminium(III)] tetrahydrate, (CHNOS)[Al(OH)(HO)]·4HO, was obtained using the above-mentioned common noncovalent interactions, as well as uncommon lone-pair-π interactions. Functional molecular modules were connected by these noncovalent interactions to generate obvious photochromic properties. The compound was prepared by the self-assembly of N,N'-bis(2-sulfoethyl)-1,4,5,8-naphthalene diimide and Al(NO)·9HO under mixed solvothermal conditions, and was characterized in detail by single-crystal X-ray diffraction, powder X-ray diffraction and FT-IR spectroscopy. The thermal stability and photochromic properties were also investigated; furthermore, in-situ solid-state UV-Vis absorption spectroscopy and electron spin resonance (ESR) were used to clarify the photochromic mechanism.
非共价相互作用，如π-π堆积相互作用、C-H…π相互作用和氢键，是构建功能超分子和材料，特别是多组分超分子体系时自组装的重要驱动力。在此，基于π-酸性萘二亚胺衍生物和双氢氧化物桥连的双核铝水合离子簇，即双[N,N'-双(2-磺酸乙酯基)-1,4,5,8-萘二亚胺]二-μ-羟基-双[四水合铝(III)]四水合物，(CHNOS)[Al(OH)(HO)]·4HO，利用上述常见的非共价相互作用以及不常见的孤对-π相互作用得以合成。功能分子模块通过这些非共价相互作用连接，从而产生明显的光致变色性质。该化合物通过N,N'-双(2-磺酸乙酯基)-1,4,5,8-萘二亚胺与Al(NO)·9HO在混合溶剂热条件下自组装制备而成，并通过单晶X射线衍射、粉末X射线衍射和傅里叶变换红外光谱进行了详细表征。还研究了其热稳定性和光致变色性质；此外，利用原位固态紫外-可见吸收光谱和电子自旋共振(ESR)来阐明光致变色机理。
