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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

Krister Larsson (Institutionen för material- och ytkemi, Oorganisk kemi) ; Lars Öhrström (Institutionen för material- och ytkemi, Oorganisk kemi)
Inorganica Chimica Acta Vol. 357 (2004), 3, p. 657-664.
[Artikel, refereegranskad vetenskaplig]

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-bromobis(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 )cobalt(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. (C) 2003 Elsevier B.V. All rights reserved.

Nyckelord: X-ray diffraction; NMR; hydrogen bond; coordination compounds; Co; N,N, '; 1, 10-phenanthroline-5,6-dione, transition-metal complexes; coordination-compounds; ruthenium;, cobalt(ii); oxidation; ligands; derivatives; hydration; chemistry;, states

Denna post skapades 2006-08-29. Senast ändrad 2014-11-10.
CPL Pubid: 9909


Institutioner (Chalmers)

Institutionen för material- och ytkemi, Oorganisk kemi (2002-2004)



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