title: Hexaaquairon(II) dipicrate dihydrate.
abstract: In the crystal structure of the title compound, [Fe(H(2)O)(6)](C(6)H(2)N(3)O(7))(2).2H(2)O, the centrosymmetric cationic iron complexes and picrate anions form separate stacks extending along the b axis. No picrate species ligate to the metal cation. Picrate ions are linked to one another in the stack via short intermolecular C.C contacts of 3.083 (4) and 3.055 (4) A. Variable-temperature X-ray diffraction measurements performed between room temperature and 93 K showed a linear decrease of the lattice parameters, suggesting that there is no phase transition.
authors.affiliation: National Institute of Advanced Industrial Science and Technology (AIST), AIST Tsukuba Central 5, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan. kaz-honda@aist.go.jp
authors.forename: Kazumasa
authors.initials: K
authors.lastname: Honda
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Yamawaki
authors.forename: Makoto
authors.initials: M
authors.lastname: Matsukawa
authors.forename: Midori
authors.initials: M
authors.lastname: Goto
authors.forename: Takehiro
authors.initials: T
authors.lastname: Matsunaga
authors.forename: Katsutoshi
authors.initials: K
authors.lastname: Aoki
authors.forename: Masatake
authors.initials: M
authors.lastname: Yoshida
authors.forename: Shuzo
authors.initials: S
authors.lastname: Fujiwara