Twenty new copper–lanthanoid complexes have been prepared. The route involves reaction of preformed copper pyridonate complexes with hydrated lanthanoid nitrates in a variety of solvents. Structural characterisation of eleven of these complexes gave some indications of how the structure is controlled in these compounds. Reaction of [Cu 6 Na(mhp) 12 ][NO 3 ] (mhp = 6-methyl-2-pyridonate) with hydrated lanthanum nitrate in CH 2 Cl 2 leads to a high-nuclearity complex containing a Cu 12 La 8 core. The twelve Cu atoms are arranged in a cuboctahedron surrounded by a cube of eight La atoms. Similar reactions involving 6-chloro-, 6-bromo- and 6-fluoro-2-pyridonate led to tetranuclear complexes which fall into three distinct structural groups. Consideration is given to the factors governing the choice of structural group.
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Blake et al. (1997) studied this question.