1. MnBa(2)(HPO(4))(2)(H(2)PO(4))(2)
Wei Sun, Li-Zhi Sun, Teng-Teng Zhu, Biao-Chun Zhao, Jin-Xiao Mi Acta Crystallogr Sect E Struct Rep Online. 2012 Jun 1;68(Pt 6):i49. doi: 10.1107/S1600536812022775. Epub 2012 May 26.
Crystals of manganese(II) dibarium bis-(hydrogenphosphate) bis-(dihydrogenphosphate), MnBa(2)(HPO(4))(2)(H(2)PO(4))(2), were obtained by hydro-thermal synthesis. The title compound is isotypic with its Cd(II) and Ca(II) analogues. The structure is built up of an infinite {[Mn(HPO(4))(2)(H(2)PO(4))(2)](4-)}(n) chain running along [100], which consists of alternate MnO(6) octa-hedra and [PO(4)] tetra-hedra, in which the centrosymmetric MnO(6) octa-hedra share their four equatorial O-atom corners with tetra-hedral [PO(3)(OH)] groups and their two axial apices with tetra-hedral [PO(2)(OH)(2)] groups. These chains are held together by BaO(9) coordination polyhedra, developing into a three-dimensional structure. The O-H⋯O hydrogen bonds additionally stabilize the structural set-up. Due to the ionic radius of Mn(2+) being much smaller than those of Ca(2+) and Cd(2+), this may imply that their adopted structure type has a great tolerance for incorporating various ions and the exploitation of more diverse compounds in the future is encouraged.
2. Zn(1.86)Cd(0.14)(OH)VO(4)
Tamara Dorđević, Jovica Stojanović, Ljiljana Karanović Acta Crystallogr Sect E Struct Rep Online. 2010 Nov 10;66(Pt 12):i79. doi: 10.1107/S1600536810044806.
The title compound, dizinc cadmium hydroxide tetraoxido-vanadate, Zn(1.86)Cd(0.14)(OH)VO(4), was prepared under low-temperature hydro-thermal conditions. It is isostructural with Zn(2)(OH)VO(4) and Cu(2)(OH)VO(4). In the crystal structure, chains of edge-sharing [ZnO(6)] octahedra are inter-connected by VO(4) tetra-hedra (site symmetries of both V atoms and their coordination polyhedra are .m.) to form a three-dimensional [Zn(OH)VO(4)](2-) framework with channels occupied by Zn and Zn/Cd cations adopting trigonal-bipyramidal and distorted octa-hedral coordinations, respectively. Zn(1.86)Cd(0.14)(OH)VO(4) is topologically related to adamite-type phases, and descloizite- and tsumcorite-type structures.
3. 1-O-Benzyl-2,3-O-iso-propyl-idene-6-O-tosyl-α-l-sorbo-furan-ose
John H Reed, Peter Turner, Atsushi Kato, Todd A Houston, Michela I Simone Acta Crystallogr Sect E Struct Rep Online. 2013 Jun 12;69(Pt 7):o1069-70. doi: 10.1107/S1600536813015638. eCollection 2013.
{(3aS,5S,6R,6aS)-3a-[(benz-yloxy)meth-yl]-6-hy-droxy-2,2-di-methyl-tetra-hydro-furo[2,3-d][1,3]dioxol-5-yl}methyl 4-methyl-benzene-sulfonate), C23H28O8S, the absolute structure and relative stereochemistry of the four chiral centres have been established by X-ray crystallography, with the absolute configuration inferred from the use of l-sorbose as the starting material. The central furan-ose ring adopts a slightly twisted envelope conformation (with the C atom bearing the methyl-benzene-sulfonate substituent as the flap) from which three substituents depart pseudo-axially (-CH2-O-benzyl, -OH and one acetonide O atom) and two substituents pseudo-equatorially (-CH2-O-tosyl and second acetonide O atom). The dioxalane ring is in a flattened envelope conformation with the fused CH C atom as the flap. In the crystal, mol-ecules pack in columns along [010] linked by O-H⋯O hydrogen bonds involving the furan-ose hy-droxy group and furan-ose ether O atom.
