A new type of supramolecular assembly by hydrogen bond templating: Identification of rare monodentate acetate coordination in [Fe < inf > 3 < /inf > (μ < inf > 3 < /inf > -O)(μ < inf > 2 < /inf > -CH < inf > 3 < /inf > COO) < inf > 6 < /inf > (H < inf > 2 < /inf > O) < inf > 2 < /inf > (CH < inf > 3 < /inf > COO)] ·T·CIO < inf > 4 < /inf > (T = 2,6-diammopyridinium cation, C < inf > 5 < /inf > H < inf > 8 < /inf > N(3)

Abstract

The complexes [Fe3(μ3-O)(μ2-CH 3COO)6(H2O)2(CH3COO)] ·C5H8N3·ClO4 (C 5H8N3 = 2,6-diaminopyridinium cation) (1) and [Fe3(μ3-O)(μ2-CH3COO) 6(H2O)2(CH3COO)]·C 5H7N2·ClO4 (C 5H7N2 = 2-aminopyridinium cation) (2) show novel self-assembled supramolecular structures in their crystals as elucidated by X-ray analysis. The structures contain [Fe3(μ3-O) (μ2-CH3COO)6(H2O) 2(CH3COO)] units as the building blocks. A detailed examination of the structures revealed that monodentate acetate, which is stabilised by a hydrogen-bond template T (2,6-diaminopyridinium cation in 1 and the 2-aminopyridinium cation in 2), plays a directing role in forming these new types of hydrogen-bonded assemblies in 1 and 2. Crystal data for 1 and 2 were determined by X-ray structure analysis. © Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2005.