The title molecular salt (2), 2,2'-(pyridine-2,6-diyl)bis(1H-benzo[d]imidazol-3-ium) 2,4,6-trimethylbenzenesulfonate chloride (C19H15N5(2+)·C9H11O3S(-)·Cl(-)), was synthesized unexpectedly from the reaction of 2,6-bis(benzimidazol-2-yl)pyridine (1) with 2-mesitylenesulfonyl chloride. Spectroscopic techniques (FT-IR, NMR and UV-vis.) were used to characterize compounds 1 and 2. Solid-state structure of compound 2 was identified by X-ray crystallography. Theoretical characterization of the spectroscopic properties of compounds 1 and 2 was achieved using the density functional theory (DFT) method with the 6-311G(d,p) basis set, and the results were checked against the experimental data. Electronic absorption spectra of the compounds have also been obtained.

中文翻译：

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通过实验和理论方法合成和表征2,2'-（吡啶-2,6-二基）双（1H-苯并[d]咪唑-3-基）2,4,6-三甲基苯磺酸氯。

标题分子盐（2），2,2'-（吡啶-2,6-二甲基）双（1H-苯并[d]咪唑-3-鎓）2,4,6-三甲基苯磺酸氯（C19H15N5（2+） ·2，6-双（苯并咪唑-2-基）吡啶（1）与2-亚甲基磺酰氯的反应意外地合成了·C9H11O3S（-）·Cl（-）。使用光谱技术（FT-IR，NMR和UV-vis。）表征化合物1和2。通过X射线晶体学鉴定化合物2的固态结构。使用6-311G（d，p）基组的密度泛函理论（DFT）方法，对化合物1和2的光谱性质进行了理论表征，并将结果与​​实验数据进行了对比。还获得了化合物的电子吸收光谱。