532938-95-7Relevant academic research and scientific papers
Novel organometallic building blocks for molecular crystal engineering
Braga, Dario,Polito, Marco,Bracaccini, Marco,D'Addario, Daniela,Tagliavini, Emilio,Sturba, Luigina,Grepioni, Fabrizia
, p. 2142 - 2150 (2003)
The synthesis and structural characterization of the ferrocenyl diboronic acid complex [Fe(η5-C5H4- B(OH)2)2] (1) and of its products of monosubstitution, [Fe(η5-C5H4-4-C5H4N) (η5-C5H4-B(OH)2)] (2 in three polymorphic modifications, 2a-c), and of disubstitution, [Fe(η5-C5H4-4-C5H4 N)2] (4), [Fe(η5-C5H4- C6H4-4-C5H4N)2] (6), and [Fe(η5-C5H4-5-C4H3 N2)2] (7), are reported together with an investigation of the mode of supramolecular bonding in the solid state. The competition between the hydrogen-bonding interactions of the (B)O-H...O(B) and (B)O-H...N types in the cases of crystalline 1 and 2 has been investigated. The B(OH)2 group provides two hydrogen bonding donor groups and two acceptors, forming mainly cyclic hydrogen-bonded systems in topological analogy with a primary amido group. Compounds 4, 6, and 7 are examples of neutral disubstituted pyridyl and pyrimidyl ferrocenyl complexes with potentials as supramolecular ligands. The compounds [Fe(η5-C5 H4-4-C5H4NH)(η5-C5 H4B(OH)2)] [NO3] (3a), [Fe(η5-C5H4-4-C5H4NH) (η5-C5H4-B(OH)2)] [SO4]·3H2O (3b), and [Fe(η5-C5H4-4-C5H4 NH)2][Cl]2·4H2O (5) have been obtained by treatment with acids of compounds 2 and 4, respectively. The interionic hydrogen bonds have also been investigated.
