Acta Cryst. (2004). E60, m441-m443 [ doi:10.1107/S1600536804006014 ]
Abstract: At 180 K, the crystal structure of ferroceneboronic acid, [Fe(C5H5)(C5H6BO2)], consists of centrosymmetric [FcB(OH)2]2 dimers [Fc is (5-C5H5)Fe(5-C5H4)], formed by a pair of complementary O-HO hydrogen-bonding interactions [OH 1.97 Å and OO 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[5-C5H4B(OH)2]2.
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