Crystal structure and Hirshfeld analysis of trans-bis-(5-fluoro-indoline-2,3-dione 3-oximato-κ2O2,N3)-trans-bis-(pyridine-κN)copper(II).

The reaction in methanol of CuII acetate monohydrate with 5-fluoro-isatin 3-oxime deprotonated with KOH in a 1:2 molar ratio and recrystallization from pyridine yielded the title compound, [Cu(C8H4FN2O2)2(C5H5N)2]. In the centrosymmetric complex, the anionic form of the isatin oxime acts as a κ2N,O donor, building five-membered metallarings. The CuII cation is sixfold coordinated in a slightly distorted octa-hedral environment by two trans, equatorial, anionic isatin derivatives and two trans pyridine ligands in axial positions. The complexes are linked by hydrogen bonding into a three-dimensional network, which is also stabilized by π-π stacking inter-actions [centroid-to-centroid distance = 3.7352 (9) Å] and C-H⋯π contacts. The Hirshfeld surface analysis indicates that the major contributions for the crystal packing are H⋯H (31.80%), H⋯C (24.30%), H⋯O (15.20%) and H⋯F (10.80%). This work is the second report in the literature of a crystal structure of a coordination compound with isatin 3-oxime ligands (coordination chemistry).