catena-Poly[[bis(methanol-κO)bis(pyridine-κN)nickel(II)]-μ-tetrafluoroterephthalato-κ2 O:O′]

In the title compound, [Ni(C8F4O4)(C5H5N)2(CH4O)2]n, the NiII ion is located on an inversion center and is coordinated by four O atoms [Ni—O = 2.079 (4) Å] from two tetrafluoroterephthalate ligands and two methanol molecules, and by two N atoms [Ni—N = 2.127 (4) Å] from two pyridine ligands in a distorted octahedral geometry. The NiII ions are connected via the tetrafluoroterephthalate anions into a one-dimensional chain running along the crystallographic [011] direction.

In the title compound, [Ni(C 8 F 4 O 4 )(C 5 H 5 N) 2 (CH 4 O) 2 ] n , the Ni II ion is located on an inversion center and is coordinated by four O atoms [Ni-O = 2.079 (4) Å ] from two tetrafluoroterephthalate ligands and two methanol molecules, and by two N atoms [Ni-N = 2.127 (4) Å ] from two pyridine ligands in a distorted octahedral geometry. The Ni II ions are connected via the tetrafluoroterephthalate anions into a one-dimensional chain running along the crystallographic [011] direction.

catena-Poly[[bis(methanol-κO)bis(pyridine-κN)nickel(II)]-µ-tetrafluoroterephthalato-κ 2 O:O′]
Chang-Ge Zheng, Jian-Quan Hong, Jie Zhang and Chao Wang S1. Comment Supramolecular coordination polymers have attracted considerable interest recently due to their intriguing network topologies and their potential applications as gas storage systems, sensors, catalysis, ion exchange materials and magnetic materials (Janiak, 2003;Rao et al., 2004;James, 2003;Dietzel et al., 2005). Chemical modification with the organic ligand can be carried out for constructing materials of different properties. Some research work in computational study suggests that adsorption property in gas storage can be improved with electronegative atoms in the organic linkers or frameworks (Zhang et al., 2007). New topologies with favorable properties will be achieved by introducing some strong electronegative atoms (e.g. Halogen atoms) to in the aromatic ring.
The one-dimensional linear electronically neutral chains of the title nickel(II) complex, (I) (Fig. 1), crystallizes in the triclinic space group P1. The tetrafluoroterephthalate ligands are coordinated to nickel(II) ion in one monodentate pattern.
In the octahedron unit, two O atoms from the tetrafluoroterephthalate ligands and two N atoms from pyridine molecules  (Kim et al., 2003;Go et al., 2004).
Both of the Ni-N bond lengths are 2.127 (4) Å, which are comparable with reported values in the similar complexes Li et al., 2003). In the aromatic ring system, the bond lengths and bond angles are slightly larger than that in reported terephthalaic acid (Śledź et al., 2001). In addition, the hydroxyl groups of methanol molecules act as donors in O-H···O hydrogen bonds (Table 1).

S2. Experimental
All the reagents and solvents employed were commercially available, and tetrafluoroterephthalaic acid was purified by recrystallization. The title compound was prepared according to the literature procedure of Rosi et al. (2005).

S3. Refinement
All the other H atoms were placed in geometrically idealized positions and constrained to ride on their parent atoms with

catena-Poly[[bis(methanol-κO)bis(pyridine-κN)nickel(II)]-µ-tetrafluoroterephthalato-κ 2 O:O′]
Crystal data Refinement. Refinement of F 2 against ALL reflections. The weighted R-factor wR and goodness of fit S are based on F 2 , conventional R-factors R are based on F, with F set to zero for negative F 2 . The threshold expression of F 2 > σ(F 2 ) is used only for calculating R-factors(gt) etc. and is not relevant to the choice of reflections for refinement. R-factors based on F 2 are statistically about twice as large as those based on F, and R-factors based on ALL data will be even larger.

Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Å 2 )
x y z U iso */U eq