title: Crystal Growth and Structure Analysis of Ce18W10O57: A Complex Oxide Containing Tungsten in an Unusual Trigonal Prismatic Coordination Environment.
abstract: The noncentrosymmetric tungstate oxide, Ce18W10O57, was synthesized for the first time as high-quality single crystals via the molten chloride flux method and structurally characterized by single-crystal X-ray diffraction. The compound is a structural analogue to the previously reported La18W10O57, which crystallizes in the hexagonal space group P6̅2c. The +3 oxidation state of cerium in Ce18W10O57was achieved via the in situ reduction of Ce(IV) to Ce(III) using Zn metal. The structure consists of both isolated and face-shared WO6octahedra and, surprisingly, isolated WO6trigonal prisms. A careful analysis of the packing arrangement in the structure makes it possible to explain the unusual structural architecture of Ce18W10O57, which is described in detail. The temperature-dependent magnetic susceptibility of Ce18W10O57indicates that the cerium(III) f1cations do not order magnetically and exhibit simple paramagnetic behavior. The SHG efficiency of Ln18W10O57(Ln = La, Ce) was measured as a function of particle size, and both compounds were found to be SHG active with efficiency approximately equal to that of α-SiO2.
authors.affiliation: Department of Chemistry and Biochemistry, University of South Carolina , Columbia, South Carolina 29208, United States.
authors.forename: Dileka
authors.initials: D
authors.lastname: Abeysinghe
authors.affiliation: Department of Chemistry and Biochemistry, University of South Carolina , Columbia, South Carolina 29208, United States.
authors.forename: Mark D
authors.initials: MD
authors.lastname: Smith
authors.affiliation: Department of Chemistry and Biochemistry, University of South Carolina , Columbia, South Carolina 29208, United States.
authors.forename: Jeongho
authors.initials: J
authors.lastname: Yeon
authors.affiliation: Department of Chemistry, University of Houston , Houston, Texas 77204, United States.
authors.forename: T Thao
authors.identifier: http://orcid.org/0000-0002-2395-3555
authors.initials: TT
authors.lastname: Tran
authors.affiliation: Department of Physics, University of Antwerp , Groenenborgerlaan 171, 2020 Antwerp, Belgium.
authors.forename: Robert
authors.initials: R
authors.lastname: Paria Sena
authors.affiliation: Department of Physics, University of Antwerp , Groenenborgerlaan 171, 2020 Antwerp, Belgium.
authors.forename: Joke
authors.initials: J
authors.lastname: Hadermann
authors.affiliation: Department of Chemistry, University of Houston , Houston, Texas 77204, United States.
authors.forename: P Shiv
authors.identifier: http://orcid.org/0000-0003-1787-1040
authors.initials: PS
authors.lastname: Halasyamani
authors.affiliation: Department of Chemistry and Biochemistry, University of South Carolina , Columbia, South Carolina 29208, United States.
authors.forename: Hans-Conrad
authors.identifier: http://orcid.org/0000-0001-7351-9098
authors.initials: HC
authors.lastname: Zur Loye