Studies on macrocyclic complexes derived from vic-dioximes. Part V. The crystal and molecular structure of the 1:1 adduct of 4,4 - ́bipyridine with Bis(diflouroborondimethylglyoximate)nickel(II)

The 1:1 adduct of 4,4 - ́bipyridine with bis(diflouroborondimethylglyoximate)nickel(II) is orthorhombic, space group I222, a = 10.108(5), b = 13.929(5), c = 15.687(5) Å, Z = 4. The structure was refined to R = 0.080 for 835 photographic reflexions. The structure consists of Ni(dmgBF₂)₂ dimer units bridged by 4,4 - ́bipyridine molecules forming polymeric chains parallel to c. The remaining 4,4 - ́bipyridine molecule per dimer unit acts as a solvate and is also aligned along c. The Ni atom us co-ordinated to four N atoms of the closely planar macrocycle [average, NiN 1.85(1) Å, NNiN 80.0(6) and 98.6(6)°] and a 4,4 - ́bipyridine N atom [NiN 2.35(1) Å] forming an irregular square pyramid. The Ni atom is 0.20 Å out of the plane of the equatorial N atoms abd the Ni⋯Ni separation in the dimer units is 3.909(3) Å. The 4,4 - ́bipyridine molecules are nonplanar, the pyridyl rings being rotated by 34 and 40° about the 4,4 - ́bond for the coordinated and solvate molecules respectively.