Mg(H₂O)₆[(IO₂(OH))₂(IO₃)]₂: a new iodate with a very large band gap and optical anisotropy

Abstract

Centimeter-sized large crystals of a new magnesium iodate, Mg(H2O)6[(IO2(OH))2(IO3)]2, have been successfully grown by a facile aqua-solution method. The title compound exhibits an interesting structural feature, namely, [(IO2(OH))2(IO3)]- pseudo-chains interacting...

Polar Bismuth Selenite Iodate Oxide BiSeIO6 with Three Types of Lone Pair Cations in One Structure

“…The selenium and iodine atoms both have the typical Se/I-O 3 pyramidal environments coordinated with three oxygen atoms along with the lone pair electrons at the top of the pyramids. The bond lengths of Se/I–O fall into the ranges of 1.779–1.799 and 1.724–1.758 Å for the Se/I(1) and Se/I(2) centers, respectively, which are consistent with the reported ones. − The average Se/I(1)–O distance is 1.786 Å, which is (Se: 0.64; I: 0.58, O: 1.22). The Se/I(1)–O distance is slightly larger than that of Se/I(2)–O because the occupancy ratio of iodine is larger on the Se/I(1) site than on the Se/I(2) site.…”

KF·B(OH)3: a KBBF-type material with large birefringence and remarkable deep-ultraviolet transparency

“…Relatively small values of O and F indicate the existence of hydrogen bonds. 15 The result of the energy-dispersive analysis by X-ray spectroscopy confirms the existence of F in the structure (Fig. S5, ESI†).…”

“…The purity of the ground crystals was confirmed by the powder X-ray diffraction (Fig. S4 15 The result of the energy-dispersive analysis by X-ray spectroscopy confirms the existence of F in the structure (Fig. S5, ESI †).…”

ZrF2(IO3)2 and RbGaF3(IO3): Two Promising Birefringent Crystals Featuring 1D Metal-Fluoride Cationic Chains and Wide Bandgaps

“…Hence, the iodate anion could act as an excellent birefringent function unit . Recently, many promising birefringent metal iodates (Δ n cal > 0.2) have been reported, including Mg­(H 2 O) 6 [(IO 2 (OH)) 2 (IO 3 )] 2 (0.230 @1064 nm), Rb­(MoO 2 ) 2 O­(IO 4 ) (0.339 @1064 nm), and LiMg­(IO 3 ) 3 (0.22 @1064 nm) . However, metal iodates usually exhibit narrow bandgaps (<4.0 eV), which might not be beneficial to effectively apply in the UV region.…”