(IUCr) [mu]-Oxido-bis{chlorido[tris(2-pyridylmethyl)amine]chromium(III)} bis(hexafluoridophosphate)

Volume 64
Part 1
Page m2
January 2008

Received 22 October 2007
Accepted 20 November 2007
Online 6 December 2007

Key indicators
Single-crystal X-ray study
T = 293 K
Mean (C-C) = 0.004 Å
R = 0.032
wR = 0.089
Data-to-parameter ratio = 13.5
Details

-Oxido-bis{chlorido[tris(2-pyridylmethyl)amine]chromium(III)} bis(hexafluoridophosphate)

Sheng Li,^a ^* Shou-Bin Wang,^b Fu-Li Zhang ^a and Kun Tang ^a

^aCollege of Medicine, Henan University, Kaifeng 475003, People's Republic of China, and ^bCollege of Chemistry and Chemical Engineering, Henan University, Kaifeng 475003, People's Republic of China
Correspondence e-mail: lisheng0821@sina.com

The title compound, [Cr₂Cl₂O(C₁₈H₁₈N₄)₂](PF₆)₂, is isostructural with the V^III analogue. Each Cr^III atom is chelated by the tetradentate tris(2-pyridylmethyl)amine ligand via four N atoms, and further coordinated by one Cl atom and one bridging O atom, giving a slightly distorted octahedral coordination geometry. The dinuclear complex is centrosymmetric, with the bridging O atom lying on a centre of inversion.

Related literature

For the isostructural V^III analogue, see: Tajika et al. (2005). For more general related literature, see: Butler & Carrano (1991); Crans et al. (1989); Dey (1974); Chen & Zubieta (1990).

Experimental

Crystal data

[Cr₂Cl₂O(C₁₈H₁₈N₄)₂](PF₆)₂
M_r = 1061.57
Triclinic, $[P \overline 1]$
a = 8.6107 (17) Å
b = 11.302 (2) Å
c = 12.798 (3) Å
= 115.50 (3)°
= 107.45 (3)°
= 91.50 (3)°
V = 1054.8 (4) Å³
Z = 1
Mo K radiation
= 0.81 mm^-1
T = 293 (2) K
0.28 × 0.22 × 0.18 mm

Data collection

Bruker APEXII CCD diffractometer
Absorption correction: multi-scan (SADABS; Bruker, 2001) T_min = 0.804, T_max = 0.867
8686 measured reflections
3877 independent reflections
3594 reflections with I > 2(I)
R_int = 0.021

Refinement

R[F² > 2(F²)] = 0.033
wR(F²) = 0.089
S = 1.00
3877 reflections
287 parameters
H-atom parameters constrained
_max = 0.51 e Å^-3
_min = -0.33 e Å^-3

Data collection: APEX2 (Bruker, 2004); cell refinement: SAINT-Plus (Bruker, 2001); data reduction: SAINT-Plus; program(s) used to solve structure: SHELXS97 (Sheldrick, 1997); program(s) used to refine structure: SHELXL97 (Sheldrick, 1997); molecular graphics: SHELXTL (Bruker, 2001); software used to prepare material for publication: SHELXTL.

Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: BI2257 ).

Acknowledgements

The authors are grateful for financial support from Henan University (grant No.05YBGG013).

References

Bruker (2001). SADABS, SAINT-Plus and SHELXTL. Bruker AXS Inc., Madison, Wisconsin, USA.
Bruker (2004). APEX2. Bruker AXS Inc., Madison, Wisconsin, USA.
Butler, A. & Carrano, C. J. (1991). Chem. Rev. 109, 61-105.
Chen, Q. & Zubieta, I. (1990). Inorg. Chem. 29, 1456-1458.
Crans, D., Bunch, R. L. & Theisen, L. A. (1989). J. Am. Chem. Soc. 111, 7597-7601.
Dey, K. J. (1974). Sci. Ind. Res. 33, 76-97.
Sheldrick, G. M. (1997). SHELXS97 and SHELXL97. University of Göttingen, Germany.
Tajika, Y., Tsuge, K. & Sasaki, Y. (2005). Dalton Trans. pp. 1438-1447.

metal-organic compounds