Synthesis and characterization of a new quaternary borate Na2Cs2Sr(B9O15)2 with the unprecedented [B9O19]11− group, notation of 3 × (3:2Δ + T)

Ba10LuB18O32F13: the first example of borate in the Lu–B–O–F system with the unprecedented FBB [B9O22]

“…Firstly, in Cs 2 O(B 2 O 3 ) 9 , 42 the FBB is [B 9 O 17 ] (9:[(3:2Δ + T) + 2(3:3Δ)]), which is composed of two B 3 O 6 and B 3 O 7 clusters. Secondly, [B 9 O 19 ] in Na 2 Cs 2 Sr(B 9 O 15 ) 2 43 is polymerized from three [B 3 O 7 ] rings with the formula 9:[3(3:2Δ + T)]. [BO 3 ] triangles in two [B 3 O 7 ] groups are connected to a [BO 4 ] tetrahedron belonging to another [B 3 O 7 ] group via sharing O atoms.…”

Na2Rb2SrB18O30 with [B9O19]11− fundamental building block consisting of three [B3O7]5− groups

“…(1) Type I: two [B 3 O 7 ] 5− groups connect with third [B 3 O 7 ] 5− via vertex‐sharing of oxygens from BO 3 and BO 4 units, respectively, such as KB 3 O 5 (or A x A’ y (B 3 O 5 ) 3 (A=Na, A’=K, x + y =3)) [38–39] . According to topological structure, (Na 0.8 K 0.2 )K 2 (B 3 O 5 ) 3 , NaK 2 (B 3 O 5 ) 3 , KB 3 O 5 , and Na(Na 0.17 K 0.83 ) 2 (B 3 O 5 ) 3 belong to Schläfli symbol of {4 2 ;6 4 }2{6 6 }; (2) Type II: two [B 3 O 7 ] 5− groups connect with third [B 3 O 7 ] 5− via vertex‐sharing of oxygens only from BO 4 units, such as AMB 9 O 15 (A=Li and Na, M=Sr and Ba) [40] and AA'M'B 18 O 30 (A=Li and Na, A’=Rb and Cs, M’=Sr, Ba and Pb) [41–43] . Although these two series feature different 4‐ c nodes, namely, one unique [B 3 O 7 ] 5− node for the former ones and three unique [B 3 O 7 ] 5− nodes for the latter ones, the Schläfli symbols of all these compounds belong to {6 4 ;8 2 } according to the topological structure.…”

Sn3B8O15: A Ternary Tin(II) Borate with Flexible [B8O18]12– Fundamental Building Block Formed by [B7O16]11– and [BO3]3– Groups

“…On the basis of statistical results, the configuration of triple B-O rings can be divided into four types. Type one: the hexatomic B-O rings connect with the adjacent ring by sharing one O atom to form a “Hand in Hand” polyborate group, which can be described as “1+1+1” type (Figure a), such as [B 9 O 17 ] 7– in α-CsB 9 O 14 and [B 9 O 19 ] 11– in Na 2 Cs 2 Sr­(B 9 O 15 ) 2 . Type two: the hexatomic B-O rings connect with the adjacent ring via sharing a boron atom to compose “shoulder to shoulder” B-O groups, which eventually form “3+0 (I)” connection type (Figure b), such as [B 7 O 15 ] 9– in ABaB 7 O 12 (A = Cs, Rb), [B 7 O 14 ] 7– in Li 4 Cs 3 B 7 O 14 and Q 18 Mg 6 (B 5 O 10 ) 3 (B 7 O 14 ) 2 F (Q = Rb, Cs), [B 7 O 16 ] 11– in Rb 3 BaTeB 7 O 15 , and [B 8 O 18 ] 12– in Li 4 Ca 2 B 8 O 16 .…”