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标题：Synthesis and structural studies of N-heterocyclic carbene Ag(I) and Hg(II) complexes and recognition of dihydrogen phosphate anion
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作者：Qingxiang Liu ; Xiaoqiang Zhao ; Zeliang Hu 等
期刊名称：Scientific Reports
电子版ISSN：2045-2322
出版年度：2017
卷号：7
期号：1
DOI：10.1038/s41598-017-07961-8
语种：English
出版社：Springer Nature
摘要：Bis-benzimidazolium salt (S)-2,2'-bis[2″-(N-Et-benzimidazoliumyl)ethoxy]-1,1'-binaphthyl hexafluorophosphate [(S)-L(1)H2]·(PF6)2 and bis-imidazolium salts (S)-2,2'-bis[2″-(N-R-imidazoliumyl)ethoxy]-1,1'-binaphthyl hexafluorophosphate [(S)-L(2)H2]·(PF6)2 and [(S)-L(3)H2]·(PF6)2 (R = ethyl or benzyl), as well as their five N-heterocyclic carbene Hg(II) and Ag(I) complexes such as [(S)-L(1)Hg(HgBr4)] (1), [(S)-L(2)Hg(HgBr4)] (2), [(S)-L(2)Hg(HgI4)] (3), {[(S)-L(2)Ag](PF6)}n (4) and [(S)-L(3)Ag](PF6) (5) have been prepared and characterized. Each of complexes 1-3 consists of two rings (one 6-membered ring and one 11-membered ring), in which the oxygen atom in the ligand participates in coordination with Hg(II) ion. In complex 4, 1D helical polymeric chain is formed via biscarbene ligand (S)-L(2) and Ag(I) ion. A 15-membered macrometallocycle is constructed through a ligand (S)-L(3) and a Ag(I) ion in complex 5. Additionally, the selective recognition of H2PO4(-) using complex 5 as a receptor was investigated on the basis of fluorescence and UV/vis spectroscopic titrations. The results indicate that complex 5 can distinguish effectively H2PO4(-) from other anions.