科研之友
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摘要
A series of bis-benzimidazolium (or bis-imidazolium) salts, and their seven N-heterocyclic carbene mercury(II) and silver(I) complexes 2-8, as well as one anionic complex 1 have been synthesized and characterized. In complex 1, two benzimidazole rings point in opposite directions, and pi-pi interactions between these two benzimidazole rings are observed. In complex 2, two 13-membered macrometallocycles are linked together by one bridging chlorine atom, in which each macrometallocycle is formed by one bidentate carbene ligand (L-2) and one Hg(II) ion. In complexes 3-6, each molecule contains one 13-membered macrometallocycle formed by one bidentate carbene ligand and one metal ion. In the crystal packings of 1-8, 1D polymeric chains, 2D supramolecular layers and 3D supramolecular frameworks are formed via intermolecular weak interactions, including hydrogen bonds, pi-pi interactions and C-H center dot center dot center dot pi contacts. Particularly, the selective recognition of Ag+ using 4 as a host compound was studied on the basis of fluorescent and UV/vis spectroscopic titrations.
- 出版日期2015
- 单位天津师范大学
