Hydrogen-bonded adducts of ferrocene-1,1 '-diylbis(diphenylmethanol): a finite cyclic 1 : 1 adduct with 2,2 '-dipyridylamine

In ferrocene-1,1'-diylbis(diphenylmethanol)-2,2'-dipyridyl-amine (1/1), [Fe(C18H15O)(2)].C10H9N3, (I), there is an intramolecular O-H...O hydrogen bond [H...O 2.03 Angstrom, O...O 2.775 (2) Angstrom and O-H...O 147degrees] in the ferrocenediol component, and the two neutral molecular components are linked by one O-H...N hydrogen bond [H...N 1.96 Angstrom, O...N 2.755 (2) Angstrom and O-H...N, 157degrees] and one N-H...O hydrogen bond [H...O 2.26 Angstrom, N...O 3.112 (2) Angstrom and N-H...O 164degrees] forming a cyclic R-3(3)(8) motif. One of the pyridyl N atoms plays no part in the intermolecular hydrogen bonding, but participates in a short intramolecular C-H...N contact [H...N 2.31 Angstrom, C...N 2.922 (2) Angstrom and C-H...N 122degrees].