Na₁₁B₂₁O₃₆X₂ (X=Cl, Br): Halogen Sodium Borates with a New Graphene‐Like Borate Double Layer

Abstract

Borate not graphene: The [B6O12]∞(6-) single borate layer is a graphene-like layer (see figure). The weak Na(+)-Br(Cl)(-) ionic connection between the layers leads to the layer cleavage, and difficulty of the block crystal growth.

Facile Syntheses of Ba2[B4O7(OH)2] and Na[B5O7(OH)2](H2O) Borate Salts Exhibiting Nonlinear Optical Activity in the Ultraviolet

“…Previous preparations of alkali/alkaline-earth metal borates were conducted at either high temperatures (>800 °C) or high pressures (>100 bar) . In the work presented here, we adopted a more convenient and energy-efficient method to synthesize single crystals of metal borates 1 and 2 .…”

Three Mixed-Alkaline Borates: Na2M2B20O32 (M = Rb, Cs) with Two Interpenetrating Three-Dimensional B-O Networks and Li4Cs4B40O64 with Fundamental Building Block B40O77

“…When the A/B value is less than 1, most of them show a 3D framework and contain high-polymerized B-O groups. However, the B-O groups display 2D layered configurations in the structure of M 2 Cs 2 ­B 10 O 17 (M = Na, K), CsB 5 O 8 ( P 2 1 / c , P 2 1 / n ), , M 3 B 7 O 12 (M = Rb, Cs) ( P 1̅, C 2/ c ), , Cs 3 B 13 ­O 21 , RbB 3 ­O 5 ( C 2/ c ), Rb 2 B 4 ­O 7 ( P 1̅), LiB 6 ­O 9 F, Na 11 B 21 ­O 36 Q 2 (Q = Cl, Br), and 1D B-O chains, isolated B-O groups can be found in Li 2 B 3 ­O 4 F 3 , Na 2 B 4 ­O 7 ( P 1̅), respectively, although the A/B value is less than 1.…”

Effects of the Orientation of [B5O11]7– Fundamental Building Blocks on Layered Structures Based on the Pentaborates

“…Hence, designing compounds with layered structures is a good strategy for developing new functional materials, while effective syntheses of layered borates are still a challenge, and the following thoughts are possible guidance: (1) decreasing the ratio of cation (A) and boron (B), which can reduce the number of terminal O atoms and make the B-O layers infinite extension; (2) substituting the MO 4 (M = Be, Al, Zn, Mg, etc.) units in known layered structures by the [BO 4 ] 5– groups with similar structures and coordination to obtain new layered borates; , and (3) introducing the ions with a relatively large ionic radius in B-O clusters and manipulating the structure polymerization. , …”