An ortho­rhom­bic polymorph of the ultraphosphate YP5O14

Single crystals of yttrium penta­phosphate(V), YP5O14, were obtained by solid-state reaction. The ortho­rhom­bic title compound belongs to the family of ultraphosphates and is the second polymorph of this composition. It is isotypic with its Ho and Er analogues. The structure contains two bridging Q 2-type PO4 tetra­hedra and one branching Q 3-type PO4 tetra­hedron, leading to infinite ultraphosphate ribbons running along the a axis. The coordination polyhedron around the Y3+ cation may be described as distorted bicapped trigonal-prismatic. The YO8 polyhedra are isolated from each other. They are linked by corner-sharing to the O atoms of six Q 2-type and of two Q 3-type PO4 tetra­hedra into a three-dimensional framework

α-Ba2P2O7

Single crystals of α-Ba2P2O7, dibarium diphosphate, were obtained by solid-state reaction. The ortho­rhom­bic structure is isotypic with α-Sr2P2O7 and is the second polymorph obtained for this composition. The structure is built from two different BaO9 polyhedra (both with m symmetry), with Ba—O distances in the ranges 2.7585 (10)–3.0850 (6) and 2.5794 (13)–2.9313 (4) Å. These polyhedra are further linked by sharing corners along [010] and either edges or triangular faces perpendicularly to [010] to form the three-dimensional framework. This polyhedral linkage delimits large channels parallel to [010] where the P2O7 diphosphate anions are located. These groups (symmetry m) are characterized by a P—O—P angle of 131.52 (9)° and an eclipsed conformation. They are connected to the BaO9 polyhedra through edges and corners

The type IV polymorph of KEu(PO3)4

Single crystals of KEu(PO3)4, potassium europium(III) polyphosphate, were obtained by solid-state reactions. This monoclinic form is the second polymorph described for this composition and belongs to type IV of long-chain polyphosphates with general formula A I B III(PO3)4. It is isotypic with its KEr(PO3)4 and KDy(PO3)4 homologues. The crystal structure is built of infinite helical chains of corner-sharing PO4 tetra­hedra with a repeating unit of eight tetra­hedra. These chains are further linked by isolated EuO8 square anti­prisms, forming a three-dimensional framework. The K+ ions are located in pseudo-hexa­gonal channels running along [01] and are surrounded by nine O atoms in a distorted environment

12-Anilinomethyl-9α-hy­droxy-4,8-dimethyl-3,14-dioxatricyclo­[9.3.0.02,4]tetra­dec-7-en-13-one

The title compound, C21H27NO4, was synthesized from 9α-hy­droxy­parthenolide, which was isolated from the chloro­form extract of the aerial parts of Anvillea radiata. The asymmetric unit contains two independent mol­ecules. In each, the ten-membered ring displays an approximative chair-chair conformation. Each of the five-membered rings adopts a flattened envelope conformation, the C(H)—C—C(H) atoms representing the flap lie out of the mean plane through the remaining four atoms by 0.443 (2) and 0.553 (2) Å. The dihedral angle between the least-squares planes through the ten- and five-membered rings in the two mol­ecules are similar [22.54 (17) and 23.39 (14)°]. In the crystal, mol­ecules are linked by O—H⋯O, O—H⋯N and N—H⋯O hydrogen bonds

Dipotassium hexa­aqua­nickel(II) bis­[hexa­fluoridozirconate(IV)]

Single crystals of the title compound, K2[Ni(H2O)6][ZrF6]2, were grown by slow evaporation of a 40% aqueous HF solution in which a stoichiometric mixture of NiCl2·6H2O, ZrF4 and KCl was dissolved. The monoclinic structure is isotypic with its K2Cu, K2Zn, Cs2Zn and Cs2Cu analogues. The structure is built up from isolated, slightly elongated octa­hedral [Ni(H2O)6]2+ complex cations (symmetry ) and dimeric [Zr2F12]4− complex anions (symmetry ) that are also isolated from each other. The [Zr2F12]4− anion results from the association of two distorted penta­gonal–bipyramidal [ZrF7] coordination polyhedra by sharing an equatorial edge passing through an inversion center of the unit cell. Both isolated [Ni(H2O)6]2+ and [Zr2F12]4− complex ions are situated in planes parallel to (010). They are connected by the eight-coordinated K+ ions into a three-dimensional structure. An intricate O—H⋯F hydrogen-bonding network consolidates the structure

Dipotassium dialuminium cyclo­octa­phosphate

Single crystals of the title compound, K2Al2P8O24, were obtained by solid-state reaction. The monoclinic structure is isotypic with that of the GaIII analogue and is built of eight-membered phosphate ring anions P8O24 8− (2/m symmetry) isolated from each other and further linked by isolated AlO6 octa­hedra ( symmetry) by sharing corners. Each AlO6 octa­hedron is linked to four P8O24 8− rings in such a way that two rings are linked through bidentate diphosphate groups attached in the cis positions on two opposite parallel edges of the octa­hedron. The two other rings are linked via corner-sharing to the two remaining corners in the trans positions of the AlO6 octa­hedron. Each P8O24 8− ring anion is linked to eight AlO6 octa­hedra. More accurately, each ring anion is linked to four AlO6 octa­hedra through bidentate diphosphate groups attached in the cis positions to the AlO6 octa­hedron and to the four remaining octa­hedra by sharing corners. This three-dimensional linkage delimits channels running parallel to [001] in which the ten-coordinated K+ cations (2 symmetry) are distributed over two columns. These columns alternate with empty octa­gonally-shaped channels expanding through the P8O24 8− ring anions

Lutetium(III) cyclo­tetra­phosphate

Single crystals of the title compound, tetra­lutetium(III) tris­(cyclo­tetra­phosphate), Lu4(P4O12)3, were obtained by solid-state reaction. The cubic structure is isotypic with its AlIII and ScIII analogues and is built up from four-membered (P4O12)4− phosphate ring anions ( symmetry), isolated from each other and further linked through isolated LuO6 octa­hedra (.3. symmetry) via corner sharing. Each LuO6 octa­hedron is linked to six (P4O12)4− rings, while each (P4O12)4− ring is linked to eight LuO6 octa­hedra

Aluminium cyclo­hexa­phosphate

Single crystals of the title compound, Al2P6O18, were obtained by solid-state reaction. The monoclinic structure is isotypic with its CrIII, GaIII and RuIII analogues and is built up of six-membered phosphate ring anions, P6O18 6−, isolated from each other and further linked by isolated AlO6 octa­hedra by sharing corners. Each AlO6 octa­hedron is linked to four P6O18 6− rings. More accurately, two rings are linked through bidentate diphosphate groups attached in the cis-positions to the AlO6 octa­hedron. The other two rings are linked to the two remaining corners, also in cis-positions of the AlO6 octa­hedron

Sodium terbium(III) polyphosphate

Single crystals of the title compound, NaTb(PO3)4, were obtained by solid-state reaction. This compound belongs to type II of long-chain polyphosphates with the general formula A I B III(PO3)4. It is isotypic with the NaNd(PO3)4 and NaEr(PO3)4 homologues. The crystal structure is built up of infinite crenelated chains of corner-sharing PO4 tetra­hedra with a repeating unit of four tetra­hedra. These chains, extending parallel to [100], are linked by isolated TbO8 square anti­prisms, forming a three-dimensional framework. The Na+ ions are located in channels running along [010] and are surrounded by six oxygen atoms in a distorted octa­hedral environment within a cut-off distance <2.9 Å

10α-Hy­droxy-4,9-dimethyl-13-[(pyrrol­idin-1-yl)meth­yl]-3,8,15-trioxatetra­cyclo­[10.3.0.02,4.07,9]penta­decan-14-one

The title compound, C19H29NO5, was synthesized from 9α-hy­droxy­parthenolide (9α-hy­droxy-4,8-dimethyl-12-methyl­ene-3,14-dioxatricyclo­[9.3.0.02,4]tetra­dec-7-en-13-one), which was isolated from the chloro­form extract of the aerial parts of Anvillea radiata. The mol­ecule is built up from two fused five- and ten-membered rings with the (pyrrolidin-4-yl)methyl group as a substituent. The two five-membered ring display the same envelope conformations, whereas the ten-membered ring adopts an approximate chair–chair conformation. The dihedral angle between the ten-membered ring and the lactone ring is 21.81 (9)°. An intra­molecular O—H⋯N hydrogen bond stabilizes the mol­ecular conformation. In the crystal, inter­molecular C—H⋯O inter­actions link the mol­ecules into chains parallel to the c axis