Two-dimensional dysprosium(III) triiodate(V) dihydrate, Dy(IO3)3(H2O)·H2O

During our research into novel nonlinear optical materials using 1,10-phenanthroline as an appending ligand on lanthanide iodates, crystals of an infinite layered DyIII iodate compound, Dy(IO3)3(H2O)·H2O, were obtained under hydrothermal conditions. The DyIII cation has a dicapped trigonal prismatic coordination environment consisting of one water O atom and seven other O atoms from seven iodate anions. These iodate anions bridge the DyIII cations into a two-dimensional structure. Through O—H⋯O hydrogen bonds, all of these layers stack along [111], giving a supramolecular channel, with the solvent water molecules filling the voids.

During our research into novel nonlinear optical materials using 1,10-phenanthroline as an appending ligand on lanthanide iodates, crystals of an infinite layered Dy III iodate compound, Dy(IO 3 ) 3 (H 2 O)ÁH 2 O, were obtained under hydrothermal conditions. The Dy III cation has a dicapped trigonal prismatic coordination environment consisting of one water O atom and seven other O atoms from seven iodate anions. These iodate anions bridge the Dy III cations into a twodimensional structure. Through O-HÁ Á ÁO hydrogen bonds, all of these layers stack along [111], giving a supramolecular channel, with the solvent water molecules filling the voids.
In the title compound, the Dy III cation has dicapped trigonal prismatic coordination sphere. The coordination enciroments of the rare earth Dy III cation consist of eight O atoms derived from seven iodate anions and one water molecule (see Fig. 1).
And these seven iodates are classed two types, one is three 3-connected iodates (

Experimental
All chemicals were obtained from commercial sources and were used as received. The title compound was handily synthesized by a hydrothermal reaction from iodic acid. To a 25 ml stainless steal Teflon-lined reaction vessel, Dy 2 O 3 (0.2 mmol, 75 mg), HIO 3 (0.8 mmol, 141 mg), 1,10-phenanthroline (0.4 mmol, 80 mg) and 13 ml H 2 O were added and stirred thoroughly for 1 h, then heated at 393 K for 2 d. After cooling down to room temperature, some colorless crystalline product (I) was obtained.

Refinement
The structure was solved using direct methods and refined by full-matrix least-squares techniques. All non-hydrogen atoms were assigned anisotropic displacement parameters in the refinement. All H atoms were added at calculated positions and refined using a riding model. (Sheldrick, 2008

Special details
Geometry. All e.s. Refinement. Refinement of F 2 against ALL reflections. The weighted R-factor wR and goodness of fit S are based on F 2 , conventional R-factors R are based on F, with F set to zero for negative F 2 . The threshold expression of F 2 > σ(F 2 ) is used only for calculating Rfactors(gt) etc. and is not relevant to the choice of reflections for refinement. R-factors based on F 2 are statistically about twice as large as those based on F, and R-factors based on ALL data will be even larger.