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'-dipyridylamine (1/1), [Fe(C18H15O)2]*C10H9N3, (I), there is an intramolecular O-H...O hydrogen bond [H...O 2.03 A, O...O 2.775 (2) A and O-H...O 147 degrees ] in the ferrocenediol component, and the two neutral molecular components are linked by one O-H...N hydrogen bond [H...N 1.96 A, O...N 2.755 (2) A and O-H...N, 157 degrees ] and one N-H...O hydrogen bond [H...O 2.26 A, N.O 3.112 (2) A and N-H...O 164 degrees ] forming a cyclic R3(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 A, C...N 2.922 (2) A and C-H...N 122 degrees ].