School of Chemistry and Chemical Engineering, Lingnan Normal University, Zhanjiang 524048, People's Republic of China.
College of Science, Northwest A&F University, Yangling 712100, Shaanxi, People's Republic of China.
Spectrochim Acta A Mol Biomol Spectrosc. 2021 Jun 5;254:119588. doi: 10.1016/j.saa.2021.119588. Epub 2021 Feb 18.
Five diverse 1D supramolecular chains, {[4-pmntd]}(1), {H[4-pmntd]•2Br}(2), {H[4-pmntd]•2NO}(3), {H[4-pmntd]•2ClO}(4), {H[4-pmntd]•2BF}(5), (where 4-pmntd was N,N'-bis (4-pyridylmethyl)naphthalene diimide) were synthesized and characterized by X-ray single-crystal structure analysis, IR spectroscopy, elemental analyses, thermogravimetric analyses, fluorescence detection. The anions effect construction of their 1D chain structural diversity through different π interactions. Compound 1 through the adjacent pyridine rings parallel π∙∙∙π interactions formed 1D linear chain structure. Compound 2 through Br anion∙∙∙π interactions and halogenbond interactions formed 1D zigzag chain structure. Compound 3 through lone pair∙∙∙π interactions of naphthalene diimide and the adjacent carboxyl group formed 1D stairway chain structure. Compound 4 through ClO anion∙∙∙π interactions formed 1D ribbon chain structure. Compound 5 through parallel π∙∙∙π interactions of the adjacent naphthalene diimide planes and pyridine rings formed 1D ladder chain structure. The five compounds' fluorescence properties and thermal stabilities were investigated. The compound 2 solution could fluorescence detection for iodide anion via fluorescence quenching.
五种不同的 1D 超分子链，{[4-pmntd]}(1)、{H[4-pmntd]·2Br}(2)、{H[4-pmntd]·2NO}(3)、{H[4-pmntd]·2ClO}(4)、{H[4-pmntd]·2BF}(5)（其中 4-pmntd 是 N,N'-双(4-吡啶基甲基)萘二酰亚胺)，通过 X 射线单晶结构分析、红外光谱、元素分析、热重分析、荧光检测进行了合成和表征。阴离子通过不同的π相互作用影响它们 1D 链结构的多样性。化合物 1 通过相邻的吡啶环平行π∙∙∙π相互作用形成 1D 线性链结构。化合物 2 通过 Br 阴离子∙∙∙π相互作用和卤键相互作用形成 1D 之字形链结构。化合物 3 通过萘二酰亚胺的孤对电子∙∙∙π相互作用和相邻的羧基形成 1D 楼梯链结构。化合物 4 通过 ClO 阴离子∙∙∙π相互作用形成 1D 带状链结构。化合物 5 通过相邻萘二酰亚胺平面和吡啶环的平行π∙∙∙π相互作用形成 1D 梯链结构。研究了这五种化合物的荧光性质和热稳定性。化合物 2 的溶液可以通过荧光猝灭对碘离子进行荧光检测。
