Tetra­kis(μ-2,4-difluoro­benzoato)bis­[(2,2′-bipyridine)(2,4-difluoro­benzoato)terbium(III)]

Hao, L.; Liu, X.

doi:10.1107/S1600536808043936

Volume 65
Part 2
Page m150
February 2009

Received 29 September 2008
Accepted 25 December 2008
Online 8 January 2009

Key indicators
Single-crystal X-ray study
T = 293 K
Mean (C-C) = 0.009 Å
Disorder in main residue
R = 0.034
wR = 0.078
Data-to-parameter ratio = 12.8
Details

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Tetrakis(-2,4-difluorobenzoato)bis[(2,2'-bipyridine)(2,4-difluorobenzoato)terbium(III)]

Lujiang Hao ^a ^* and Xia Liu ^b

^aCollege of Food and Biological Engineering, Shandong Institute of Light Industry, Jinan 250353, People's Republic of China, and ^bMaize Research Institute, Shandong Academy of Agricultural Science, Jinan 250100, People's Republic of China
Correspondence e-mail: lujianghao001@yahoo.com.cn

In the centrosymmetric dinuclear title compound, [Tb₂(C₇H₃F₂O₂)₆(C₁₀H₈N₂)₂], the Tb^III ion is coordinated by an N,N'-bidentate 2,2'-bipyridine molecule, and two O,O'-bidentate 2,4-difluorobenzoate (dfb) anions. One of the latter also bonds to the second Tb^III centre through one of its O atoms. The third dfb anion bonds to one Tb atom from each of its O atoms. Thus, the three dfb species have three different coordination modes. This results in an irregular TbN₂O₇ coordination sphere for the metal ion. The F atoms and their associated H atoms in the simple bidentate dfb anion are disordered over two sets of sites in a 0.672 (10):0.328 (10) ratio.

Related literature

For related literature on the biological applications of carboxylates as ligands, see, for example: Serre et al. (2005).

Experimental

Crystal data

[Tb₂(C₇H₃F₂O₂)₆(C₁₀H₈N₂)₂]
M_r = 1572.77
Triclinic, $[P \overline 1]$
a = 11.401 (1) Å
b = 12.189 (1) Å
c = 12.588 (2) Å
= 103.99 (2)°
= 102.90 (2)°
= 113.58 (2)°
V = 1451.5 (3) Å³
Z = 1
Mo K radiation
= 2.52 mm^-1
T = 293 (2) K
0.44 × 0.26 × 0.20 mm

Data collection

Bruker APEXII CCD diffractometer
Absorption correction: multi-scan (SADABS; Bruker, 2001) T_min = 0.403, T_max = 0.632
8233 measured reflections
5557 independent reflections
4813 reflections with I > 2(I)
R_int = 0.0210

Refinement

R[F² > 2(F²)] = 0.034
wR(F²) = 0.078
S = 1.03
5557 reflections
434 parameters
H-atom parameters constrained
_max = 0.60 e Å^-3
_min = -0.57 e Å^-3

Table 1
Selected bond lengths (Å)

Tb1-N1	2.565 (3)
Tb1-N2	2.586 (4)
Tb1-O6ⁱ	2.364 (3)
Tb1-O3ⁱ	2.377 (3)
Tb1-O5	2.379 (3)
Tb1-O2	2.418 (3)
Tb1-O4	2.481 (3)
Tb1-O1	2.498 (3)
Tb1-O3	2.696 (3)
Symmetry code: (i) -x+1, -y+2, -z+1.

Data collection: APEX2 (Bruker, 2004); cell refinement: SAINT-Plus (Bruker, 2001); data reduction: SAINT-Plus; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: SHELXTL (Sheldrick, 2008); software used to prepare material for publication: SHELXTL.

Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: HB2812 ).

Acknowledgements

This work was supported by the Natural Science Foundation of Shandong Province (grant No. Y2007D39).

References

Bruker (2001). SADABS and SAINT-Plus. Bruker AXS Inc., Madison, Wisconsin, USA.
Bruker (2004). APEX2. Bruker AXS Inc., Madison, Wisconsin, USA.
Serre, C., Marrot, J. & Ferey, G. (2005). Inorg. Chem. 44, 654-658.
Sheldrick, G. M. (2008). Acta Cryst. A64, 112-122.

metal-organic compounds