Coordination Polymers with Intramolecular Fluorine-Involved Contacts in Two-Dimensional Sheet Windows

Abstract

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 intramolec...