cis-Aquabis(2,2′-bipyridine-κ2 N,N′)fluoridochromium(III) bis(perchlorate) dihydrate

The title mixed aqua–fluoride complex, [CrF(C10H8N2)2(H2O)](ClO4)2·2H2O, has been synthesized by aquation of the corresponding difluoride complex using lanthanide(III) ions as F− acceptors. The complex crystallizes with a CrIII ion at the center of a distorted octahedral coordination polyhedron with a cis arrangement of ligands. The crystal packing shows a hydrogen-bonding pattern involving water molecules, the coordinated F atom and the perchlorate anions

The title mixed aqua-fluoride complex, [CrF(C 10 H 8 N 2 ) 2 -(H 2 O)](ClO 4 ) 2 Á2H 2 O, has been synthesized by aquation of the corresponding difluoride complex using lanthanide(III) ions as F À acceptors. The complex crystallizes with a Cr III ion at the center of a distorted octahedral coordination polyhedron with a cis arrangement of ligands. The crystal packing shows a hydrogen-bonding pattern involving water molecules, the coordinated F atom and the perchlorate anions

Experimental
Crystal data [CrF(C 10
The most important structural element in the title compound is the cis arrangement of ligators in a distorted octahedral coordination polyhedron around the central Cr III ion ( Fig. 1). Distortion from ideal geometry is dictated by the nearly fixed bite angles of the two bipy ligands [79.51 (5) and 79.24 (5)°]. This pattern is also seen in the structurally related difluoride complexes cis-[V(bipy) 2 F 2 ]BF 4 (Kavitha et al., 2005) (Birk et al., 2008), but is not discernible in the structure reported here.
The crystal packing in the title complex (Fig. 2) shows a hydrogen bonding pattern involving water molecules, coordinated F atom and perchlorate anions (Table 2).
supplementary materials sup-2 Experimental Safety remark: Perchlorate complexes of metal ions are potentially explosive. The title complex burns with high intensity when ignited in a gas flame. According to Delavar & Staples (1981), the corresponding phen complex is explosive.
All chemicals were used as received.