title: Polymorph of {2-[(2-hydroxyethyl)iminiomethyl]phenolato-kappaO}dioxido{2-[(2-oxidoethyl)iminomethyl]phenolato-kappa3O,N,O'}molybdenum(VI).
abstract: A second polymorphic form (form I) of the previously reported compound {2-[(2-hydroxyethyl)iminiomethyl]phenolato-kappaO}dioxido{2-[(2-oxidoethyl)iminomethyl]phenolato-kappa(3)O,N,O'}molybdenum(VI) (form II), [Mo(C(9)H(9)NO(2))O(2)(C(9)H(11)NO(2))], is presented. The title structure differs from the previously reported polymorph [Głowiak, Jerzykiewicz, Sobczak & Ziółkowski (2003). Inorg. Chim. Acta, 356, 387-392] by the fact that the asymmetric unit contains three molecules linked by O-H...O hydrogen bonds. These trimeric units are further linked through O-H...O hydrogen bonds to form a chain parallel to the [111] direction. As in the previous polymorph, each molecule is built up from an MoO(2)(2+) cation surrounded by an O,N,O'-tridentate ligand (O(-)C(6)H(4)CH=NCH(2)CH(2)O(-)) and weakly coordinated by a second zwitterionic ligand (O(-)C(6)H(4)CH=N(+)HC(2)H(4)OH). All complexes are chiral with the absolute configuration at Mo being C or A. The main difference between the two polymorphs results from the alternation of the chirality at Mo within the chain.
authors.affiliation: Laboratoire de Chimie de Coordination, UPR 8241 du CNRS, 205 route de Narbonne, 31077 Toulouse Cedex 4, France.
authors.forename: Dominique
authors.initials: D
authors.lastname: Agustin
authors.forename: Jean Claude
authors.initials: JC
authors.lastname: Daran
authors.forename: Rinaldo
authors.initials: R
authors.lastname: Poli