Synthesis and structure of the new pentanary uranium(VI) silicate, K4CaUSi4O14, a member of a structural family related to fresnoite

Gregory Morrison; Mark D. Smith; T. Thao Tran; P. Shiv Halasyamani; Hans-Conrad zur Loye

doi:10.1039/C5CE00504C

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Synthesis and structure of the new pentanary uranium(vi) silicate, K₄CaUSi₄O₁₄, a member of a structural family related to fresnoite†

Gregory Morrison,^a Mark D. Smith,^a T. Thao Tran,^b P. Shiv Halasyamani^b and Hans-Conrad zur Loye*^a

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* Corresponding authors

^a Department of Chemistry and Biochemistry, University of South Carolina, Columbia, SC, USA
E-mail: zurloye@mailbox.sc.edu

^b Department of Chemistry, University of Houston, Houston, TX, USA

Abstract

Single crystals of K₄CaUSi₄O₁₄ have been grown from a eutectic CaF₂–KF flux. K₄CaUSi₄O₁₄ crystallizes in a new structure which exhibits a 49-fold superstructure believed to be due to a modulation of the uranium and silicon polyhedra. We report the sub-cell of the structure which adopts the tetragonal space group P [4 with combining macron] n2 with lattice parameters a = 9.2862(2) Å, c = 8.3796(4) Å, and V = 722.60(5) Å³. K₄CaUSi₄O₁₄ is a member of a structural family related to the mineral fresnoite which we describe here. Finally, we report UV-vis absorbance and SHG measurements on the compound, which is non-centrosymmetric.

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Article information

DOI: https://doi.org/10.1039/C5CE00504C
Article type: Paper
Submitted: 10 Mar 2015
Accepted: 02 May 2015
First published: 13 May 2015

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CrystEngComm, 2015,17, 4218-4224

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Synthesis and structure of the new pentanary uranium(VI) silicate, K₄CaUSi₄O₁₄, a member of a structural family related to fresnoite

G. Morrison, M. D. Smith, T. T. Tran, P. S. Halasyamani and H. zur Loye, CrystEngComm, 2015, 17, 4218 DOI: 10.1039/C5CE00504C

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