metal-organic papers m982 Meghdadi et al.  [Co(C 22 H 26 N 3 O 2 )(C 5 H 5 N)]PF 6 doi:10.1107/S1600536807009464 Acta Cryst. (2007). E63, m982–m984 Acta Crystallographica Section E Structure Reports Online ISSN 1600-5368 {2,2 0 -[1,1 0 -(4-Azaheptane-1,7-diyldinitrilo)- diethylidyne]diphenolato}(pyridine)cobalt(III) hexafluorophosphate Soraia Meghdadi, a Jean-Claude Daran, b * Mehdi Amirnasr a and Mahbod Morshedi a a Department of Chemistry, Isfahan University of Technology, Isfahan 84156-83111, Iran, and b Laboratoire de Chimie de Coordination, CNRS, UPR8241, 205 Route de Narbonne, 31077 Toulouse Cedex, France Correspondence e-mail: daran@lcc-toulouse.fr Key indicators Single-crystal X-ray study T = 180 K Mean (C–C) = 0.004 A ˚ Disorder in solvent or counterion R factor = 0.043 wR factor = 0.138 Data-to-parameter ratio = 16.5 For details of how these key indicators were automatically derived from the article, see http://journals.iucr.org/e. Received 2 February 2007 Accepted 27 February 2007 # 2007 International Union of Crystallography All rights reserved The title complex, [Co(C 22 H 27 N 3 O 2 )(C 5 H 5 N)]PF 6 or [Co{(Me- sal) 2 dpt}(py)]PF 6 , where (Me-sal) 2 dpt is 2,2 0 -[1,1 0 -(4-aza- heptane-1,7-diyldinitrilo)diethylidyne]diphenolate and py is pyridine, contains a pentadentate (Me-sal) 2 dpt ligand which furnishes an N 3 O 2 set, such that the N and O atoms of the salicylidene rings occupy trans positions in an equatorial plane, with the secondary amine N atom and the pyridine ligand in the axial positions. In the observed conformation of the pentadentate ligand, the salycilidene rings are bent away from the axial position occupied by the secondary amine N atom. The geometry of the resulting CoN 4 O 2 coordination could be described as distorted octahedral. Comment Cobalt complexes with pentadentate Schiff base ligands have been widely investigated for their many applications (Botteher et al., 1997; Barnes et al. ,1988; Niswander & Taylor, 1977; Hirota et al., 1998; Nagata et al., 1995). The synthesis, structure and reactivity of these compounds have also played an important role in the development of coordination chem- istry. The properties of these complexes can be modified by the structural modification of the pentadentate Schiff base and by the nature of the ligand occupying the sixth coordination site. We have recently reported the structure of some Ni II and Cu II complexes of (Me-sal) 2 dpt (Morshedi et al., 2006; Amir- nasr et al., 2006). In this context, we report here the synthesis and structure of the title compound, [Co III {(Me- sal) 2 dpt}(py)]PF 6 , (I). The environment surrounding Co III in (I) is distorted octahedral (Fig. 1), in which the secondary amine N atom and the pyridine ligand are trans, with N1—Co—N4 = 179.1 (1)  . The two N and two O atoms of the equatorial N 2 O 2 are also trans in this complex, with N2—Co—N3 = 179.32 (9)  and