Tris(3-nitropentane-2,4-dionato-κ 2O,O′)-cobalt(III)

Abstract

The structure of the title compound, [Co(C 5H 6NO 4) 3], consists of a Co III ion octahedrally coordinated by three bidentate 3-nitropentane-2,4-dionate ligands. The complex was prepared via the nitration of tris-(2,4-penta-nedionato-κ 2 O,O′)cobalt(III) with a solution of copper(II) nitrate in glacial acetic acid. The central C atom and the nitro group of one 3-nitropentane-2,4-dionate ligand are disordered over two positions with an occupancy ratio of 0.848 (4):0.152 (4). A second nitro group is also disordered over two orientations with an occupancy ratio of 0.892 (7):0.108 (7). Two of the ligand methyl groups form C - H⋯O interactions with two different nitro groups to form chains running along the c axis. Additional C - H⋯O interactions are found between ligand methyl groups and the cobalt-bound O atoms, also resulting in the formation of chains along the c axis.