Bis-benzimidazolium salt 1 was prepared via a series of reactions using 2,2＇-diphenol as starting material. Compound 2 was afforded through the intramolecular C--C coupling reaction of 1 under the catalysis of Pd（OAc）2. The structure of 2 is characterized through X-ray diffraction analyses, 1H NMR and 13C NMR. In 2, two boat-like seven-membered rings are contained, where the C--C bond distance newly formed is 1.461（5） A, and it is between regular C--C single bond （1.54 A） and C=C double bond （1.34 A）. This shows that new C--C bond has partial double-bond character. In the crystal packing of 2, the 2D supramolecular layers are formed via C--H..-F hydrogen bond.
Rui Liu Ran Huo Yue Bi Zhixiang Zhao Qingxiang Liu
The bis-benzimidazolium salt bis[2-（N-ethylbenzimidazoliumyl）ethyl]amine hexafluorophosphate（LH2·（PF6）2） and its N-heterocyclic carbene silver（Ⅰ） complex[L2Ag3]（PF6）3（1）have been prepared and characterized.In complex 1,a trinuclear silver（Ⅰ） architecture is formed by two tridentate ligands and three silver（I） atoms,in which one 12- and two 7-membered rings are contained.In the crystal packing of 1,1D chain and 2D supramolecular layer are formed via intermolecular weak interactions,including π…π interactions and C-H…π contacts.Additionally,the fluorescence emission spectra of LH2-（PF6）2 and 1 are described.
LIU JunHUO RanWEI QingZHAO Zhi-XiangLIU Qing-Xiang
