X-ray and NMR study of the fate of the Co(1,10-phenanthroline-5,6-diketone) 3 3 + ion in aqueous solution: supramolecular motifs in the packing of 1,10-phenanthroline-5,6-diketone and 1,10-phenanthroline-5,6-diol complexes

Add time:09/26/2019    Source:infona.pl

X-ray structures are presented of three new cobalt complexes prepared from Co(III) and N,N ' -1,10-phenanthroline-5,6-dione. The cis-aqua-chloro-bis(N,N ' -1,10-phenanthroline-5,6-dione)cobalt(II) nitrate trihydrate (3) and the cis-aqua-bromo-bis(N,N ' -1,10-phenanthroline-5,6-dione)cobalt(II) trifluoro-methanesulfonate tetrahydrate (4), crystalize in the same space group with a similar arrangement of the complex ions. However, on the molecular scale there are important differences. The cobalt complex in 3 has a typical high-spin geometry whereas in 4 the cobalt complex displays a Jahn-Teller distortion characteristic for low-spin compounds. The third structure is di(N,N ' -1,10-phenanthroline-5,6-diol)(N,N ' -1,10-phenanthroline-5,6-dione)c obalt(III) bromide hexahydrate (5). NMR studies of the hydration of the Co(III)(1,10-phenanthroline-5,6-dione) 3 3 + ion in water and DMSO are also presented. The various possible transformations of the N,N ' -1,10-phenanthroline-5,6-dione ligand are discussed.

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