Coordination Polymers with Intramolecular Fluorine-Involved Contacts in Two-Dimensional Sheet Windows
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- 作者：Hamid Reza KhavasiNarjes Rahimi
- 刊名：Crystal Growth & Design
- 出版年：2017
- 出版时间：February 1, 2017
- 年：2017
- 卷：17
- 期：2
- 页码：834-845
- 全文大小：1112K
- ISSN：1528-7505
文摘
Six two-dimensional polymeric complexes of [Hg(L2-F)2]n, 1, [Hg(L2,5-F)2]n, 2, [Hg(L3-F)2]n, 3, [Hg(L2,3,4-F)2]n, 4, [Hg(L3,4,5-F)2]n, 5, and [Hg(L2,3,4,5-F)2]n, 6 and a discrete complex of [Hg(L2,6-F)2], 7, in which Ln-F ligands are N-(fluorinatedphenyl)-2-pyrazinecarboxamides carrying fluorine atoms on the different positions of phenyl ring, have been synthesized and characterized. The crystal structures from X-ray diffraction reveal that all polymeric complexes have similar two-dimensional (2D) sheet windows. From a topological perspective, each metal atom can be viewed as 4-connected nodes and Ln-F ligands can be considered as linkers in the formation of these 2D windows. Because of the flexibility of the ligand, fluorinated-phenyl rings as hanging groups in the windows are pointed toward the adjacent groups to generate different fluorine-involved intramolecular interactions. One of the common features in the crystal structures of these complexes is the presence of a strong tendency to form intramolecular F···π interactions in 2D windows of the crystal structure of all polymeric complexes, except complex 3. These interactions are cooperating with weak C–H···F and C–H···O hydrogen bonds. Also, in the crystal structure of complexes 5 and 6, carrying three and four fluorine atoms on phenyl rings, type II F···F synthons between adjacent rings have been observed in cooperation with F···π interactions. Hirshfeld surface analysis also confirms that the F···F/π contacts are predominant.