Hydrogen bonding in α-ferrocenyl alcohols: structures of 1-ferrocenylethanol, 1-ferrocenyl-2-phenylethanol, 1-ferrocenyl-1-phenylpropan-1-ol, 1-ferrocenyl-1-phenyl-2-methylpropan-1-ol, 1-ferrocenyl-1-phenyl-2,2-dimethylpropan-1-ol, 1-ferrocenyl-1,2-diphenylethanol and diferrocenyl(phenyl)methanol

Abstract

The structure of 1-ferrocenylethanol (l a ), C 12 H 14 FeO, tetragonal, I 4 1 cd , a = 23.3334 (18), c = 7.7186 (11) Å, Z = 16, R = 0.025 for 850 observations [ I > 3 σ ( I )], contains spiral chains generated by a 4 1 axis, in which the molecules are connected by O—H...O hydrogen bonds in a motif with graph set C (2) with an O...O distance of 2.724 (3) Å. 1-Ferrocenyl-2-phenylethanol (I f ), C 18 H 18 FeO, orthorhombic, Pnaa , a = 9.8589 (7), b = 15.2800 (17), c = 19.1399 (17) Å, Z = 8, R = 0.036 for 1508 observations [ I > 3 σ ( I )], crystallizes as dimeric aggregates lying across a crystallographic twofold axis and held together by O—H...O hydrogen bonds in a motif with graph set R 2 2 (4) with an O...O distance of 2.868 (8) Å; there are also intramolecular O—H...π(C 5 H 5 ) interactions. 1-Ferrocenyl-1-phenylpropan-1-ol (2 b ), C 19 H 20 FeO, monoclinic, P 2 1 / c , a = 10.2443 (13), b = 10.5811 (17), c = 14.2487 (12) Å, β = 100.190 (9)°, Z = 4, R = 0.029 for 2289 observations [ I > 3 σ ( I )], crystallizes as isolated molecules containing O—H...π(C 5 H 5 ) interactions. In 1-ferrocenyl-1-phenyl-2-methylpropan-1-ol (2 c ), C 20 H 22 FeO, monoclinic, Cc , a = 25.387 (4), b = 7.6825 (6), c = 17.803 (3) Å, β = 108.217 (17)°, Z = 8, R = 0.022 for 3286 observations [ I > 3 σ ( I )], there are two molecules in the asymmetric unit, but the structure consists of isolated molecules containing O—H...π(C 5 H 5 ) interactions. 1-Ferrocenyl-1-phenyl-2,2-dimethylpropan-1-ol (2 d ), C 21 H 24 FeO, monoclinic, P 2 1 / n , a = 8.007 (4), b = 13.002 (2), c = 66.24 (1) Å, β = 91.96 (3)°, Z = 16, R = 0.072 for 4130 observations [ I > 3 σ ( I )], has four molecules in the asymmetric unit, but there is no intermolecular hydrogen bonding. The structure of 1-ferrocenyl-1,2-diphenylethanol (2 f ), C 24 H 22 FeO, monoclinic, C 2/ c , a = 26.229 (2), b = 5.889 (2), c = 24.553 (2) Å, β = 104.114 (11)°, Z = 8, R = 0.036 for 1733 observations [ I > 2.5 σ ( I )], consists of isolated molecules in which the hydroxyl H atom is disordered unequally over three sites, each of which is trans to one of the C—C bonds involving C1; H atoms in two of these sites are involved in intramolecular O—H...π(C 5 H 5 ) interactions and the H atom in the third is involved in an O—H...π(arene) interaction. The structure of diferrocenyl(phenyl)methanol (2 g ), C 27 H 24 Fe 2 O, triclinic, P {\bar 1}, a = 9.3999 (11), b = 11.1988 (16), c = 11.9720 (16) Å, a =117.844 (11), β = 98.890 (10), γ = 102.362 (11)°, Z = 2, R = 0.031 for 3435 observations [ I > 2.5 σ ( I )], consists of centrosymmetric dimers held together by O—H...O hydrogen bonds in a motif with graph set R 2 2 (4) with an O...O distance of 2.926 (4) Å; there are also intramolecular O—H...π(C 5 H 5 ) interactions. Closed dimers containing the R 2 2 (4) (OH) 2 hydrogen-bonding motif, while unknown for purely organic alcohols, are a common occurrence in α -ferrocenyl alcohols (five examples from 13 known structures).