Organometallic building blocks for crystal engineering.: Synthesis, structure and hydrogen bonding interactions in [Fe(η5-C5H4-CH2(CH3)OH)2], [Fe(η5-C5H3(CH3)COOH)2], [Fe(η5-C5H4CH(CH3)NH(η5-C5H4CH(CH3))] and in the diaminecyclohexane salt [Fe(η5-C5H4COO)2]2- [(1S,2S)-(NH3)2C6H10]2+•2[H2O]

The novel ferrocene-based compounds [Fe(eta (5)-C5H4-CH(CH3)OH)(2)] (1), [Fe(eta (5)-C5H3(CH3)COOH)(2)] (2), [Fe(eta (5)-C5H4CH-(CH3)NH(eta (5)-C5H4CH(CH3))] (3) and the diaminecyclohexane salt [Fe(eta (5)-C5H4 COO)(2)](2-) [1S,2S-(NH3)(2)C6H10](2+) .2[H2O] (4) have been synthesised and their molecular and supramolecular structures determined by single-crystal X-ray diffraction. The hydrogen bonding networks established by the -COOH, CH(CH3)OH, and -COO(-) groups have been studied and the structural parameters compared with those available for the prototypical dicarboxylic acid [Fe(eta (5)-C5H4COOH)(2)]. (C) 2001 Elsevier Science B.V. All rights reserved.