A Novel Family of Layered Bismuth Compounds

Lone‐Pair Interfaces That Divide Inorganic Materials into Ionic and Covalent Parts

“…The Cu-Cl arrangement is simple but remarkable: CuCl 4 tetrahedra share Cl vertices to form T3 supertetrahedral [Cu 10 Cl 20 ] 10À units, much akin to the borosulfate and boroselenate T3 supertetrahedra reported by Krebs et al [8][9][10] Recent research has focused on nanoclusters with large Tn supertetrahedral units, as they have a potential to create novel low-density nanoporous crystalline solids with many interesting properties. Those studies concern chalcogenide clusters built of supertetrahedra of type T4 and T5.…”

“…The new compound Cu 20 Sb 35 O 44 Cl 37 (1) crystallizes in the tetragonal space group I4/mmm, with unit-cell parameters a = 18.144 (2) and c = 15.795 (2) . It features extensive disorder, indicative of a lowering of local symmetry.…”

“…[19] The Cl region of the structure may actually be intercalated by alkali metals as in Cs x Bi 2Àx Pb x O 2 Cl 2 to form a second, ionically bonded substructure. [20] Lone pairs define the boundary between the two regions of different interactions.…”

Synthesis, Structure, and Characterization of a Layered Mixed Metal Oxychloride, PbVO3Cl

“…[1][2][3][4][5][6][7][8] Thus, designing new layered compounds still remains a continuing challenge. Among them, layered materials consisting of asymmetric units are of particular interest attributable to their potential applications to the frequency doubling and waveguiding materials, piezoelectric sensors, and memory materials.…”

Cs7Sm11[TeO3]12Cl16 and Rb7Nd11[TeO3]12Br16, the new tellurite halides of the tetragonal Rb6LiNd11[SeO3]12Cl16 structure type

“…The decorated layers interleave with CsCl-like layers comprised of M (1) [38], or 3.56Å in CsCl [39]. The metalhalide layers are situated around z = 0 and z = ½.…”