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The reaction in methanol of Cu II 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(C 8 H 4 FN 2 O 2 ) 2 (C 5 H 5 N) 2 ]. In the centrosymmetric complex, the anionic form of the isatin oxime acts as a κ 2  N , O donor, building five-membered metallarings. The Cu II 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).

acta crystallographica. section e, crystallographic communications

Crystal structure and Hirshfeld analysis of trans-bis(5-fluoroindoline-2,3-dione 3-oximato-κ2 O 2,N 3)-trans-bis(pyridine-κN)copper(II)