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2004
Iodine
I 0036
52- 017
The Lone-Pair Cation I5+ in a Hexagonal Tungsten Oxide-Like Framework: Synthesis, and Second-Harmonic Generating Properties of Cs2I4O11. — Large colorless hexagonal prismatic crystals of the title compound are prepared hydrothermally
from mixtures of Cs2CO3, HIO3, Nb2O5, and H2O (autoclave, 220 °C, 4 d, 85% yield).
Cs2I4O11 crystallizes in the hexagonal space group P63 with Z = 2 (single crystal XRD).
The compound exhibits a layered hexagonal tungsten oxide like framework consisting
of asymmetric IO5 and IO3 polyhedra. Both the five- and three-coordinate I5+ cations
are in asymmetric coordination environments. The title compound has a second-harmonic generation efficiency of approximately 300 times that of SiO2. — (OK, K. M.;
HALASYAMANI*, P. S.; Angew. Chem., Int. Ed. 43 (2004) 41, 5489-5491; Dep.
Chem., Univ. Houston, Houston, TX 77204, USA; Eng.) — W. Pewestorf
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