Synthesis and characterization of novel copper(II) 2D coordination polymers from a fluorinated flexible ligand with remarkable clathration ability

Abstract

Two-dimensional (2D) grid coordination polymers were prepared by the reaction of 1,4-bis(4-pyridylmethyl)tetrafluorobenzene (bpf) with Cu(NO 3) 2 in the presence of aromatic compounds. Crystal structures of {[Cu(bpf) 2(NO 3) 2] (biphenyl)2} n (1), {[Cu(bpf) 2(NO 3) 2] (m-C 6H 4(OMe) 2) 2} n (2), {[Cu(bpf) 2(NO 3) 2] Ph tBu} n (3) and {[Cu(bpf) 2(NO 3)(H 2O)]NO 3 (bpf) 0.5} n (4) were determined. The grid networks were held together by C-H O and C-H F hydrogen bonds via the NO 3 - anions and the tetrafluorophenylene rings of bpf, respectively. Biphenyl, m-dimethoxybenzene, t-butylbenzene, and bpf molecules were clathrated in cyclic cavities of the grid networks through arene-perfluoroarene interactions. These coordination networks have remarkable clathration ability for aromatic compounds. © 2011 by the authors; licensee MDPI, Basel, Switzerland.