Open AccessSynthesis and structural and magnetic characterisation of cobalt(ii)–sodium phosphonate cage compounds
Author(s) -
Stuart K. Langley,
Madeleine Helliwell,
Roberta Sessoli,
Simon J. Teat,
Richard E. P. Winpenny
Publication year - 2009
Publication title -
dalton transactions
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.98
H-Index - 184
eISSN - 1477-9234
pISSN - 1477-9226
DOI - 10.1039/b819976k
Subject(s) - cobalt , phosphonate , sodium methoxide , chemistry , crystallography , cage , diamagnetism , sodium , cubane , ligand (biochemistry) , magnetization , inorganic chemistry , crystal structure , catalysis , organic chemistry , biochemistry , physics , receptor , mathematics , combinatorics , quantum mechanics , magnetic field
The reaction of cobalt salts with phosphonic acids in the presence of 6-chloro-2-hydroxypyridine as a co-ligand, using sodium methoxide as a base, leads to a series of new polymetallic cobalt cages. Variation of the phosphonate present and the cobalt salt leads to {Co(6)Na(8)}, {Co(12)}, {Co(13)Na(6)}, {Co(14)Na(4)} and {Co(15)Na} cages, all of which have been characterized by X-ray crystallography. Using lithium methoxide produces a sixth cage with a {Co(6)Li(9)} core. The structures are, in general, extremely irregular with no structural motifs common to the six cages. Magnetic studies of these cages show a general decline in the product chi(m)T with T, but for {Co(13)Na(6)}, {Co(15)Na} and {Co(12)} there are maxima at low temperature, which suggest non-diamagnetic ground states. Investigation of the dynamic behaviour of the magnetisation of these complexes shows that the {Co(13)Na(6)}, and possibly the {Co(12)} cage, appear to display slow relaxation of magnetisation.
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