Cover illustration: Selectively labeled view of bis(4-methylpiperidine)(5,10,15,20-tetraphenylporphyrinato)iron(II), with ellipsoids at the 35% probability level. Only the H atoms attached to the piperidine N atoms are shown. See Munro & Ntshangase [Acta Cryst. (2003), C59, m224-m227].
The trigonal polytype of orthoboric acid consists of pseudo-hexagonal sheets of hydrogen-bonded B(OH)3 molecules, with van der Waals forces binding adjacent sheets and repetition after every third sheet.
Single crystals of a new aquahydroxidocopper(II) oxovanadium(IV) vanadate have been synthesized hydrothermally at 473 K. The three-dimensional structure presents layers of vanadate tetrahedra and distorted oxovanadium octahedra connected by Cu atoms.
Zn2(TeO3)Cl2 has a layered structure in which the Cl atoms and the 5s2 lone pairs of the TeIV atom protrude from the surfaces of each layer towards adjacent layers, which are only held together by dispersion forces. The compound is isostructural with the synthetic compound CuZn(TeO3)Cl2 and the mineral sophiite, Zn2(SeO3)Cl2.
Dilanthanum triniobium disulfide octaoxide, La2Nb3S2O8, crystallizes in the orthorhombic space group Pnnm and is isostructural with the Ln2Ta3X2O8 (Ln = La, Ce, Pr and Nd, and X = S and Se) family of tantalum compounds.
The title compound is a new acidic pyrophosphate metallate. It consists of cobalt–pyrophosphate layers joined by K+ ions and H-atom bridges. The Co2+ ions are octahedrally surrounded by four pyrophosphate O atoms and two water molecules.