Tris(1,1,1,5,5,5-hexa­fluoro-2,4-pentane­dionato-κ2 O,O′)molybdenum(III)

In the title compound, [Mo(C5HF6O2)3], the unit cell is built up by three independent MoIII atoms located on two different threefold axes. The three independent mol­ecules are roughly identical and each MoIII atom is surrounded by three chelating hexa­fluoro­acetonate ligands in a three-bladed propeller-like arrangement, as observed in related compounds with acetyl­acetonate-type ligands. The structure of the title compound is very similar to the trigonal form of the CrIII analogue. However, the latter crystallizes in a higher-symmetry space group, P c1. Both crystals are twinned by merohedry with the same twin law ( 0/010/00) in reciprocal space, but the symmetry of the Laue group in which it operates is different, to m for the title complex, and m to 6/mmm for the CrIII complex

2-Amino-3-carb­oxy­pyridinium chloride hemihydrate

The asymmetric unit of the title compound, C6H7N2O2 +·Cl−·0.5H2O, consists of two protonated 2-amino-3-carb­oxy­pyridine cations, two chloride anions and one mol­ecule of water. The crystal packing can be described as alternating layers of cations and anions parallel to (110), which are linked together by Ow—H⋯Cl inter­actions. In the crystal, four types of classical hydrogen bonds are observed, viz. cation–anion (O—H⋯Cl and N—H⋯Cl), cation–cation (N—H⋯O), cation–water (N—H⋯Ow) and water–anion (Ow—H⋯Cl), resulting in the formation of an infinite three-dimensional network

rac-{[2-(Diphenyl­thio­phosphor­yl)ferrocen­yl]meth­yl}dimethyl­ammonium diphenyl­dithio­phosphinate

2-(Diphenyl­thio­phosphino)dimethyl­amino­methyl­ferrocene is a key inter­mediate in the synthesis of various ferrocenyl ligands. During one such synthesis, the title compound, [Fe(C5H5)(C20H22NPS)](C12H10PS2), was isolated as a by-product. It is built up by association of (2-(diphenyl­phosphino)ferrocen­yl)meth­yl)dimethyl­ammonium cations and diphenyl­phosphino dithio­ate anions. N—H⋯S, C—H⋯S and C—H⋯π inter­actions link the anions and cations. Each anion–cation pair is linked two by two through C—H⋯π inter­actions, forming pseudo dimers

(±)-Bis(1-carb­oxy-2-phenyl­ethanaminium) hexa­fluoro­silicate(VI)

The asymmetric unit of the title fluoro­silicate salt, 2C9H12NO2 +·SiF6 2−, consists of a phenylalaninium cation and half of a fluorosilicate anion, the Si atom being located on an inversion center. In the crystal, all of the F atoms act as hydrogen-bond acceptors and link the cations through different graph-set motifs, forming layers developing parallel to (100)

Diethyl 2-{(dibenzyl­amino)[4-(trifluoro­meth­yl)phen­yl]meth­yl}malonate

The asymmetric unit of the title compound, C29H30F3NO4, contains two independent mol­ecules. In each independent mol­ecule, one of two terminal ethyl groups is disordered over two conformations: the occupancies of major components were fixed at 0.53 and 0.64 in the two mol­ecules. In the crystal structure, weak inter­molecular C—H⋯O hydrogen bonds link mol­ecules into chains propagating along [10]

1-(Diphenyl­phosphinothio­yl)-2-[(4-methyl­phen­yl)meth­oxy­meth­yl]ferrocene

Following our continuing inter­est in developing new chiral phosphine-containing ferrocenyl ligands, we synthesized the title compound, [Fe(C5H5)(C26H24OPS)], in which there are two nearly identical mol­ecules in the asymmetric unit. The conformation of the cyclo­penta­dienyl (Cp) rings in each ferrocenyl group are inter­mediate between eclipsed and staggered, with twist angles of 16.6 (2) and 8.9 (2)°. The protecting S atom is located endo with respect to the substituted Cp ring. In the crystal, mol­ecules are connected through inter­molecular C—H⋯π inter­actions

12-{[4-(2-Fluoro­phen­yl)piperazin-1-yl]­meth­yl}-9α-hy­droxy-4,8-dimethyl-3,14-dioxatricyclo­[9.3.0.02,4]tetra­dec-7-en-13-one

The title compound, C25H33FN2O4, 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 asymmetric unit contains two independent mol­ecules. In each mol­ecule, the ten-membered ring displays an approximative chair–chair conformation. Each of the piperazine rings adopts a perfect chair conformation, while both lactone rings show an envelope conformation, one with the C atom bearing the piperazin-1-ylmethyl group as the flap, the other with the junction C atom not attached to the ring O atom as the flap. The dihedral angles between the least-squares planes through the ten- and five-membered rings in the two mol­ecules are similar [19.1 (3) and 16.2 (3)°]. An intra­molecular O—H⋯N hydrogen bond stabilizes the mol­ecular conformation. The crystal packing is stabilized by C—H⋯O hydrogen bonds

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

The title compound, C26H36N2O6, was synthesized from 9α-hy­droxy­parthenolide (9α-hy­droxy-4,8-dimethyl-12-methylen-3,14-dioxa-tricyclo­[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 fused five- and ten-membered rings with two additional ep­oxy ring systems and a meth­oxy­phenyl­piperazine group as a substituent. The ten-membered ring adopts an approximate chair–chair conformation, while the piperazine ring displays a chair conformation and the five-membered ring shows an envelope conformation with the C atom closest to the hy­droxy group forming the flap. The mol­ecular conformation is determined by an O—H⋯N hydrogen bond between the hy­droxy group and a piperazine N atom. The crystal structure is built up by weak C—H⋯O inter­actions

(±)-N-[4-Acetyl-5-methyl-5-(4-methyl­cyclo­hex-3-en­yl)-4,5-dihydro-1,3,4-thia­diazol-2-yl]acetamide

The new title thiadiazole compound, C14H21N3O2S, was semi-synthesized starting from 1-(4-methyl­cyclo­hex-3-en­yl)ethanone, a natural product isolated from Cedrus atlantica essential oil. The stereochemistry has been confirmed by single-crystal X-ray diffraction. The thia­diazo­line ring is roughly planar, although it may be regarded as having a half-chair conformation. The cyclo­hexenyl ring has a half-chair conformation. The most inter­esting feature is the formation of a pseudo-ring formed by four mol­ecules associated through N—H⋯O hydrogen bonds around a fourfold inversion axis, forming an R 4 4(28) motif

1-Isopropyl-4,7-dimethyl-2,8-dinitro­naphthalene

The title compound, C15H16N2O4, was synthesized from a mixture of α-himachalene (2-methyl­ene-6,6,9-trimethyl­bicyclo­[5.4.O1,7]undec-8-ene) and β-himachalene (2,6,6,9-tetra­methyl­bicyclo­[5.4.01,7]undeca-1,8-diene) which were isolated from an oil of the Atlas cedar (Cedrus atlantica). The asymmetric unit contains two independent mol­ecules. In each of the two mol­ecules, two O atoms of one nitro group are disordered over two sets of sites with site-occupancy factors of 0.636 (5):0.364 (5) and 0.832 (5):0.168 (5). The crystal structure features weak C—H⋯O hydrogen bonds