A novel chiral coordination polymer with a two-dimensional undulated (6,4)-network: [Co 4 (2,2′-bipy) 4 (H 2 O) 2 (btec) 2 ] n (btec = 1,2,4,5-benzenetetracarboxylate)

The novel coordination polymer [Co4(2,2′-bipy)4(H2O)2(btec)2]n (btec = 1,2,4,5-benzenetetracarboxylate), 1, has been hydrothermally synthesized. X-Ray diffraction experiments reveal that 1 exhibits an interesting two-dimensional (2D) chiral undulated (6,4)-network, which represents the first example of a 2D chiral coordination polymer containing two kinds of organic ligands. The value of the Flack parameter, x = 0.52(2), shows that the crystal of 1 is an inversion twin containing approximately 50% of the right-handed and 50% of the left-handed crystal structure and the whole compound is a racemate. Variable temperature magnetic susceptibility indicates that antiferromagnetic interactions exist between metallic Co(II) centers in 1.