Two new octahedral/pyramidal frameworks containing both cation channels and lone-pair channels: syntheses and structures of Ba2MnIIMn2III(SeO3)6 and PbFe2(SeO3)4

Hydrogen-Bond-Assisted Alignment of [MCu(SeO3)4Cl(H2O)]4– (M = Fe, Ga) Anionic Layers to Form Two Polar Oxychlorides: Pb2MCu(SeO3)4Cl(H2O)

“…The two primary chains share Se(4)O 3 pyramids to construct the [FeCu(SeO 3 ) 4 Cl(H 2 O)] 4− layer structure in the ac-plane. A similar transitional metal− SeO 3 chain connection topology has been previously found in selenites, such as in PbFe 2 (SeO 3 ) 4 ,44 BaFe 2 (SeO 3 ) 4 ,45 Pb 5 CuCl 4 (SeO 3 ) 4 ,46 and Sr 2 Cu(SeO 3 ) 2 Cl 2 47. To the best of our knowledge, the Cu-4SeO 3 1D chain building structure based on the CuO 4 Cl(H 2 O) units was the first example obtained in polar compounds.…”

[Cd2(Te6O13)][Cd2Cl6] and Cd7Cl8(Te7O17): Novel Tellurium(IV) Oxide Slabs and Unusual Cadmium Chloride Architectures

“…Metal tellurites adopt many unusual structures because of the presence of the stereochemically active lone pair of Te(IV) and the existence of a variety of isolated or polymeric Te(IV)O x ( x = 3, 4, 5) polyhedra . The asymmetric coordination polyhedron adopted by the Te(IV) atom may also result in noncentrosymmetric structures with consequently interesting physical properties, such as nonlinear optical second harmonic generation (SHG). − Transition metal Te(IV) oxyhalides can be regarded as “chemical scissors”, and they are promising new low-dimensional magnets. − A number of transition metal Te(IV) oxychlorides have been reported. − Very recently, a series of lanthanide transition metal (Cu or Mn) Te(IV) oxychlorides have been prepared by our group . Our exploration of new lanthanide cadmium(II) Te(IV) oxychlorides produced two novel cadmium tellurium(IV) oxychlorides instead, namely, [Cd 2 (Te 6 O 13 )][Cd 2 Cl 6 ] and Cd 7 Cl 8 (Te 7 O 17 ), which display several unusual structural building blocks: two new types of 1D tellurium(IV) oxide anions (Te 6 O 13 2- and Te 7 O 17 6- ), 1D [Cd 2 Cl 6 ] 2- double chains, and 2D [Cd 7 Cl 8 ] 6+ sheets.…”

Exploration of Vanadate Selenites Solid Phase Space, Crystal Structures, and Polymorphism

“…Here, lone-pair active cations (Pb 2+ ) or oxo-anions (SeO 3 2– ) may favor the organization of the edifice into polar structures. In fact, far from the prediction, the Pb 2+ –d 0 TM–Se 4+ –O systems (d 0 TM = V 4+/5+ , − Cu 2+ , , Mo/W 6+ , Nb 5+ , Fe 3+ , Ni/Co 2+ ), on 15 reported compounds three are effectively NCS, namely, β-PbNi­(SeO 3 ) 2 (space group Cmc 2 1 ), Pb 4 (VO 2 ) 2 ­(SeO 3 ) 4 ­(Se 2 O 5 ) (space group Fdd 2), and the hydrated α-Pb 4 (V 5+ 3 O 8 ) 2 ­(SeO 3 ) 3 ­(H 2 O) (space group P 2 1 ). Dealing with vanadates, the offered multiple coordinations (tetrahedral, pyramidal, octahedral) − further diversify the complexity of reachable edifices.…”