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Effects of meta-substitution on aggregation in the cubanes [SnNR]4 {R = [2-Me-5-MeOC6H3], [2,5-(MeO)2C6H3] and [3,5-(MeO)2C6H3]}

2002; Royal Society of Chemistry; Issue: 6 Linguagem: Inglês

10.1039/b107425c

1472-7773

Alan Bashall, Alessio Ciulli, E.A. Harron, G.T. Lawson, Mary McPartlin, Marta E. G. Mosquera, Dominic S. Wright,

Organometallic Complex Synthesis and Catalysis

An investigation of the solid-state X-ray structures of the cubanes [SnN{2-Me-5-MeOC6H3}]4, (1), [SnN{2,5-(MeO)2C6H3}]4, (2), and [SnN{3,5-(MeO)2C6H3}]4, (3), containing meta-MeO substituents on their aromatic groups, shows that unprecedented modes of intra- and intermolecular association occur. In 1, novel co-ordination of two of the cubane Sn2N2 faces by thf ligands is found, the first observation of Lewis base solvation by a separate donor ligand in this class of complexes. In 2, dimerisation of cubane units occurs via a combination of Sn⋯Sn, Sn⋯O and arene⋯Sn interactions, whereas in 3, an unusual 'sinusoidal' pattern of aggregation is seen.