In the monomeric title complex, [Co(C6H8O4)(C10H9N3)(H2O)2]·3H2O, the distorted octahedral CoN2O4 coordination environment comprises two N-atom donors from the bidentate dipyridyldiamine ligand, two O-atom donors from one of the carboxylate groups of the bidentate chelating adipate ligand and two water molecules. In addition, there are three solvent water molecules which are involved in both intra- and inter-unit O—H⋯O hydrogen-bonding interactions, which together with an amine–water N—H⋯O hydrogen bond produce a three-dimensional framework.
In the title hydrated molecular salt, [Fe(C12H8N2)3](C9H5N4O)2·0.5H2O, the water molecule site is half-occupied. The Fe—N bond lengths within the octahedral tris-chelate [Fe(phen)3]2+ ion (phen is 1,10-phenantroline) are indicative of a low-spin d
6 electronic configuration for the metal ion. The C—N, C—C and C—O bond lengths in the polynitrile anions indicate extensive electronic delocalization. In the crystal, the components are linked through O—H⋯N hydrogen bonds, forming  chains, as well as through Coulombic interactions.
In the structure of the title compound, (C5H7N2)[Cr(C2O4)2(H2O)2], two crystallographically independent formula units are present. Both chromium atoms are six-coordinated in a distorted octahedral geometry by two chelating equatorial oxalato ligands and two axial water molecules. The [Cr(C2O4)2(H2O)2]− anions and C5H7N2
+ cations are linked through a complex three-dimensional hydrogen-bonding network consisting of N—H⋯O and O—H⋯O interactions.
Single crystals of Ca5Zr3F22, pentacalcium trizirconium docosafluoride, were obtained unexpectedly by solid-state reaction between CaF2 and ZrF4 in the presence of AgF. The structure of the title compound is isotypic with that of Sr5Zr3F22 and can be described as being composed of layers with composition [Zr3F20]8− made up from two different [ZrF8]4− square antiprisms (one with site symmetry 2) by corner-sharing. The layers extending parallel to the (001) plane are further linked by Ca2+ cations, forming a three-dimensional network. Amongst the four crystallographically different Ca2+ ions, three are located on twofold rotation axes. The Ca2+ ions exhibit coordination numbers ranging from 8 to 12, depending on the cut off, with very distorted fluorine environments. Two of the Ca2+ ions occupy interstices between the layers whereas the other two are located in void spaces of the [Zr3F20]8− layer and alternate with the two Zr atoms along . The crystal under investigation was an inversion twin.
The title compound, C19H29O4, was synthesized from 9α-hydroxyparthenolide (9α-hydroxy-4,8-dimethyl-12-methylen-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-1-ylmethyl group as a substituent. The five-membered lactone ring has an envelope conformation, whereas the ten-membered and pyrrolidine rings display approximate chair–chair and twisted conformations, respectively. The dihedral angle between the ten-membered ring and the lactone ring is 18.01 (19)°. An intramolecular O—H⋯N hydrogen bond occurs. The crystal structure is stabilized by weak intermolecular C—H⋯O hydrogen-bonding interactions.
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.
The title compound, C15H15NO, which was synthesized under solvent-free conditions by the reaction of acetoacetone and 2-naphthylamine, adopts a Z conformation about the C=C bond. The enamine–ketone fragment is approximately planar [maximum deviation = 0.026 (3) Å] and forms a dihedral angle of 39.78 (3)° with the naphthalene ring system. An intramolecular N—H⋯O hydrogen bond is observed.
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.
The title compound, C22H28O, was isolated from the aerial part of Inula viscosa (L) Aiton [or Dittrichia viscosa (L) Greuter]. The cyclohexene ring has a half-chair conformation, whereas the cyclohexane ring displays a chair conformation being substituted at position 2 by a 3-(4-methylphenyl)prop-2-enoyl group. In the crystal, weak intermolecular C—H⋯O hydrogen bonds link molecules into chains in the  direction.
The title compound, C21H25ClO, was semi-synthesized from isocostic acid, isolated from the aerial part of Inula Viscosa (L) Aiton [or Dittrichia Viscosa (L) Greuter]. The cyclohexene ring has a half-chair conformation, whereas the cyclohexane ring displays a chair conformation.
The title compound, C16H23Cl2NO, was synthesised from β-himachalene (3,5,5,9-tetramethyl-2,4a,5,6,7,8-hexahydro-1H-benzocycloheptene), which was isolated from the essential oil of the Atlas cedar (Cedrus Atlantica). The molecule contains a seven membered ring, which is fused to a five- and a three-membered ring. The five-membered ring has a twisted conformation, whereas the seven-membered ring displays a chair conformation. The dihedral angle between the five- and seven-membered rings is 45.26 (9)°. The absolute structure was established unambiguously from anomalous dispersion effects. In the crystal, molecules are linked into chains propagating along the b axis by intermolecular N—H⋯O hydrogen bonds; an intramolecular N—H⋯O link also occurs.
The title compound, C16H24Cl2O, was synthesized from β-himachalene (3,5,5,9-tetramethyl-2,4a,5,6,7,8-hexahydro-1H-benzocycloheptene), which was isolated from essential oil of the Atlas cedar (Cedrus atlantica). The two fused rings exhibit different conformations: the six-membered ring has a screw-boat conformation, while the seven-membered ring displays a boat conformation. The dihedral angle between the two rings is 56.56 (18)°. In the crystal, molecules aggregate into supramolecular chains along the c axis mediated by O—H⋯O hydrogen bonds.
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.
The title compound, C16H24Cl2O, was synthesized from β-himachalene (3,5,5,9-tetramethyl-2,4a,5,6,7,8-hexahydro-1H-benzocycloheptene), which was isolated from the essential oil of the Atlas cedar (cedrus atlantica). The molecule forms an extended sheet of two fused rings which exhibit different conformations. The six-membered ring has a half-chair conformation, while the seven-membered ring displays a chair conformation; the dihedral angle between the two rings is 38.2 (1)°.
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  and either edges or triangular faces perpendicularly to  to form the three-dimensional framework. This polyhedral linkage delimits large channels parallel to  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.
In the title compound, [Cu(C6H6N4)2](C9H5N4O)2, the Cu2+ ion (site symmetry ) is coordinated by two N,N′-bidentate 2,2′-biimidazole (H2biim) ligands, generating a square-planar CuN4 geometry. The dihedral angle between the aromatic rings in the ligand is 0.70 (9)°. In the polynitrile 1,1,3,3-tetracyano-2-ethoxypropenide (tcnoet) anion, the C—N, C—C and C—O bond lengths indicate extensive electronic delocalization. An alternative description for the metal-ion geometry is an extremely distorted CuN6 octahedron, with two N-bonded tcnoet anions completing the coordination. In the crystal, the components are linked by N—H⋯N and C—H⋯N interactions.
Single crystals of the title compound, potassium praseodymium(III) polyphosphate, were obtained by solid-state reaction. The monoclinic non-centrosymmetric structure is isotypic with all other KLn(PO3)4 analogues from Ln = La to Er, inclusive. The crystal structure of these long-chain polyphosphates is built up from infinite crenelated polyphosphate chains of corner-sharing PO4 tetrahedra with a repeating unit of four tetrahedra. These chains, running along , are arranged in a pseudo-tetragonal rod packing and are further linked by isolated PrO8 square antiprisms [Pr—O = 2.3787 (9)–2.5091 (8) Å], forming a three-dimensional framework. The K+ ions reside in channels parallel to  and exhibit a highly distorted coordination sphere by eight O atoms at distances ranging from 2.7908 (9) to 3.1924 (11) Å.
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  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.
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.
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
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 , are linked by isolated TbO8 square antiprisms, forming a three-dimensional framework. The Na+ ions are located in channels running along  and are surrounded by six oxygen atoms in a distorted octahedral environment within a cut-off distance <2.9 Å.
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.
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
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  and are surrounded by nine O atoms in a distorted environment.
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.