Anion Effects on the Formation of Silver(I) Complexes with the Flexible Ligand 4,4′‐Bis(1,2,4‐triazol‐1‐ylmethyl)biphenyl |
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Authors: | Tianjun Ni Yongmei Zhao Min Shao Prof Dr Shourong Zhu Feifei Xing Mingxing Li |
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Institution: | 1. Department of Chemistry, College of Science, Shanghai University, Shanghai 200444, P. R. China;2. Department of Chemistry, Xinxiang Medical University, East of Jinsui Road, Xinxiang, Henan 453003, P. R. China;3. Instrumental Analysis and Research Center, Shanghai University, Shanghai 200444, P. R. China |
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Abstract: | The reaction of 4,4′‐bis(1,2,4‐triazol‐1‐ylmethyl)biphenyl (btmb) with silver(I) salts of BF4–, NO3– and N3– led to the formation of four new silver(I) coordination polymers {Ag(btmb)]BF4}n ( 1 ), {Ag2(btmb)3](NO3)2(H2O)5}n ( 2 ), Ag2(btmb)(N3)2]n ( 3 ), and Ag(btmb)(N3)]n ( 4 ). Their coordination number varies from 2 (in 1 ) to 3 (in 2 ), 4 (in 3 ), and 5 (in 4 ). Different from the single chain structure of 1 , complex 2 displays a 1D ladder‐like double chain framework, whereas complex 3 exhibits a 2D layered architecture. Complex 4 has the same anion as complex 3 but shows a different metal‐to‐ligand ratio and a 1D double‐zigzag chain structure. Both 3 and 4 have Ag ··· Ag argentophilic interactions. The ligand btmb adopts both cis or trans configuration in the studied complexes. A trans‐ or cis‐btmb ligand link silver ions with Ag ··· Ag distances of ≈?18 and 13 Å, respectively. BF4– and NO3– are non‐coordinating anions in 1 and 2 . N3– is the bridging anion in 3 (1,3‐bridging fashion) and 4 (1,1‐bridging fashion). These findings suggest that the coordination numbers around the AgI ion correlate to the coordination abilities of anions and the btmb to silver ratio. In addition, the influence of anions on thermal stability were also investigated. This work is a good example that nicely supports the less explored field of anion‐dependent structures of complexes with non‐pyridyl ligands. |
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Keywords: | Silver 4 4′ ‐Bis(1 2 4‐triazole‐1‐ylmethyl)biphenyl Crystal structure Anion effect Metal‐organic frameworks |
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