Na₇(SeO₄)₃(IO₃) and K₂(SeO₄)[IO₂(OH)]: two new iodate-selenates with short-wave UV cutoff edge and large birefringence

Abstract

Herein, I5+ with stereochemically active lone pairs (SCALP) was introduced into the selenate system, and two novel iodate-selenates were successfully obtained, named Na7(SeO4)3(IO3) and K2(SeO4)[IO2(OH)]. Innovatively, both the title compounds...

Two Short-Wave UV Antimony(III) Sulfates Exhibiting Large Birefringence

“…Several strategies have been shown to be effective in improving the total optical anisotropy: (1) the introduction of halogens into tetrahedral groups to break T d symmetry; , (2) the introduction of d 10 transition metal cations to increase the birefringence; , and (3) the introduction of cations with stereochemically active lone-pair (SCALP) electrons, for example, Te 4+ and Bi 3+ , to enhance total optical anisotropy. , Currently, many compounds with large birefringence have been discovered based on Bi 3+ and Te 4+ , such as Bi­(IO 3 )­(SO 4 ) (0.087@1064 nm), KBiSO 4 Cl 2 (0.098@1064 nm), and Ba 2 TeP 2 O 9 (0.126@1064 nm) . The Sb 3+ cation has a similar electronic structure to them.…”

Ba2Ga2F6(IO3)(PO4): the first fluoride-containing iodate-phosphate with a 1D [Ga2F6(IO3)(PO4)]4− helix chain

“…On the other hand, recent research results indicate that introducing oxyanions with wide HOMO–LUMO gaps, such as BO 3 3− , NO 3 − , SO 4 2− , PO 4 3− , etc ., into the iodates can yield novel mixed-anion iodates. 34–44 These crystals not only exhibit wide bandgaps but also strong SHG effects or large birefringence, such as Sc(IO 3 ) 2 (NO 3 ) (4 × KDP; 0.348@546 nm; 4.15 eV), 38 Be 2 (BO 3 )(IO 3 ) (7.2 × KDP; 0.172@1064 nm; 4.32 eV), 39 Na 7 (IO 3 )(SO 4 ) 3 (0.5 × KDP; 0.075@1064 nm; 4.83 eV) 41 and Cd 2 (IO 3 )(PO 4 ) (4 × KDP; 4.04 eV). 36 However, to date, there have been no reports of fluorinated mixed-anion iodates.…”

Optimization of Functional Building Blocks Generates a Substantial Improvement in Birefringence from Sn2OSO4 to Sn3O2(OH)(HSO4)

“…Studies have demonstrated that the macroscopic optical properties of materials are determined by their functional groups, underscoring the significance of selecting the appropriate functional group. − In recent years, non-π-conjugated tetrahedral anionic groups (e.g., SO 4 , PO 4 , and SeO 4 ) have garnered significant attention due to their wide optical transmission window. − This feature is particularly advantageous for the development of optical crystals suitable for short-wave UV applications, as exemplified by the compounds Li 2.9 Cs 1.1 (SO 4 ) 2 (exp. 5.39 eV), GdSr 3 (PO 4 ) 3 (exp.…”