Received 15 August 2013
The are two independent complex cations in the title salt, [CrF2(C5H5N)4]ClO4, each located on a centre of inversion, as well as an independent perchlorate counter-ion. The complex cations adopt slightly distorted octahedral coordination environments around the CrIII ion, defined by four pyridine (py) N atoms in the equatorial plane and two F- ligands in the axial positions; intramolecular C-HF contacts are noted. The mean Cr-N(py) and Cr-F bond lengths are 2.088 (6) and 1.8559 (10) Å, respectively. The three-dimensional architecture is sustained by hydrogen bonds involving the pyridine C-H groups as donors, and F and O atoms as acceptors.
For background to geometric isomerism in transition metal comlexes, see: Knight & Scott (2003); Ronconi & Sadler (2007). For the synthesis, see: Glerup et al. (1970). For the structure of trans-[Cr(py)4F2]PF6, see: Fochi et al. (1991).
Data collection: PAL ADSC Quantum-210 ADX Software (Arvai & Nielsen, 1983); cell refinement: HKL3000sm (Otwinowski & Minor, 1997); data reduction: HKL3000sm; program(s) used to solve structure: SHELX-2013-XS (Sheldrick, 2008); program(s) used to refine structure: SHELX-2013-XL (Sheldrick, 2008); molecular graphics: DIAMOND (Brandenburg, 2007); software used to prepare material for publication: WinGX (Farrugia, 2012).
Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: TK5248 ).
This work was supported by a grant from the 2012 Academic Research Fund of Andong National University. The experiment at the PLS-II 2D-SMC beamline was supported in part by MEST and POSTECH.
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