title: Synthesis and modular structural architectures of mineralogically inspired novel complex Pb oxyhalides.
abstract: Three novel Pb oxyhalides, Pb3[O10Pb20](GeO4)4Cl10 (1), [O16Pb22][OPb](OH)I10(I,Br)(H2O) (2), and Pb5.5Si0.5O6Cl (3), have been prepared by high-temperature solid-state reactions (1 and 3) and hydrothermal method (2). The structure of 1 is based upon novel [O10Pb20](20+) layers of edge- and corner-sharing oxocentered OPb4 tetrahedra with cavities occupied by the GeO4 tetrahedral anions. The interlayer space contains low-occupied Pb sites and Cl(-) anions. The structure of 2 contains unique [O16Pb22][12+] layers of edge-sharing OPb4 tetrahedra with X(-) ions (X = I, Br) in and in between the layers. The structure of 3 is the first example of the Pb oxyhalide with the 3:1 ratio between the O-Pb and X sheets (X = halide). The unprecedented structure topologies and architectures observed in the title compounds are closely related to those observed in rare natural Pb oxyhalides that have no synthetic analogues to date.
authors.affiliation: Department of Crystallography, Saint-Petersburg State University , University emb. 7/9, St. Petersburg, 199034 Russia.
authors.forename: Oleg I
authors.initials: OI
authors.lastname: Siidra
authors.forename: Diana O
authors.initials: DO
authors.lastname: Zinyakhina
authors.forename: Anastasiya I
authors.initials: AI
authors.lastname: Zadoya
authors.forename: Sergey V
authors.initials: SV
authors.lastname: Krivovichev
authors.forename: Rick W
authors.initials: RW
authors.lastname: Turner