At 180 K, the crystal structure of ferroceneboronic acid, [Fe(C 5H5)(C5H6BO2)], consists of centrosymmetric [FcB(OH)2]2 dimers [Fc is (η5-C5H5)Fe(η5-C 5H4)], formed by a pair of complementary O-H⋯O hydrogen-bonding interactions [O⋯H 1.97 Å and O⋯O 2.806 (3) Å]. The remaining two O-bound H atoms per [FcB(OH)2] 2 moiety serve to link the dimeric units to adjacent dimers in a criss-cross fashion, very similar to that between hydrogen-bonded chains in solid Fe[η5-C5H4B(OH)2] 2. © 2004 International Union of Crystallography Printed in Great Britain - all rights reserved.
Bresner, C., Aldridge, S., Fallis, I. A., & Ooi, L. L. (2004). Hydrogen-bonding motifs in the solid-state structure of ferroceneboronic acid. Acta Crystallographica Section E: Structure Reports Online, 60(4). https://doi.org/10.1107/S1600536804006014