Bis(triphenyl-phospho-ranyl-idene)ammonium iodide

A [Cu3(μ3-O)]-pyrazolate metallacycle with terminal nitrate ligands exhibiting point group symmetry 3

The trinuclear triangular cuprate anion of the title compound, tris-[bis-(tri-phenyl-phospho-ranyl-idene)ammonium] tris-(μ2-4-chloro-pyrazolato-κ(2) N:N')-μ3-oxido-tris-[(nitrato-κ(2) O,O')cuprate(II)] nitrate monohydrate, (C36H30P2N)[Cu3(C3H2ClN2)3(NO3)3O]NO3·H2O, has point group symmetry 3., with the μ3-O atom located on the threefold rotation axis. The distorted square-pyramidal coordination sphere of the Cu(II) atom is completed by two N atoms of trans-bridging pyrazolate groups and a chelating nitrate anion. The complex anion is slightly bent, with the nitrate and pyrazolate groups occupying positions above and below the Cu3 plane, respectively. In the crystal, weak O-H⋯O and C-H⋯O hydrogen bonds, as well as π-π inter-actions, are present.

Insights into the strong in-vitro anticancer effects for bis(triphenylphosphane)iminium compounds having perchlorate, tetrafluoridoborate and bis(chlorido)argentate anions

Three new compounds containing the bis(triphenylphosphane)iminium cation (PPN(+)) with ClO4(-), BF4(-) and [AgCl2](-) as counter anions have been synthesized and structurally characterized. The two derivatives with ClO4(-) and BF4(-) were found to be isostructural by single crystal X-ray diffraction. Interestingly, the three compounds show extremely potent antiproliferative effects against the human cancer cell line SKOV3. To gain insights into the possible mechanisms of biological action, several intracellular targets have been considered. Thus, DNA binding has been evaluated, as well as the effects of the compounds on the mitochondrial function. Furthermore, the compounds have been tested as possible inhibitors of the seleno-enzyme thioredoxin reductase.

A second polymorph of bis-(triphenyl-λ(5)-phosphanyl-idene)ammonium chloride-boric acid adduct

The title crystal structure is a new triclinic polymorph of [(Ph3P)2N]Cl·(B(OH)3) or C36H30NP2 (+)·Cl(-)·BH3O3. The crystal structure of the ortho-rhom-bic polymorph was reported by [Andrews et al. (1983 ▶). Acta Cryst. C39, 880-882]. In the crystal, the [(Ph3P)2N](+) cations have no significant contacts to the chloride ions nor to the boric acid mol-ecules. This is indicated by the P-N-P angle of 137.28 (8)°, which is in the expected range for a free [(Ph3P)2N](+) cation. The boric acid mol-ecules form inversion dimers via pairs of O-H⋯O hydrogen bonds, and each boric acid mol-ecule forms two additional O-H⋯Cl hydrogen bonds to one chloride anion. These entities fill channels, created by the [(Ph3P)2N](+) cations, along the c-axis direction.

Bis(triphenyl-λ-phosphanylidene)ammonium hydrogen dichloride

In the title compound, [(Ph₃P)₂N]⁺·[Cl-H-Cl]⁻ or C₃₆H₃₀NP₂⁺·Cl₂H⁻, the H atom of the [Cl—H—Cl]⁻ anion and the N atom of the [(Ph₃P)₂N]⁺ cation are located on a twofold axis, yielding overall symmetry 2 for both the cation and the anion. The central P—N—P angle [144.12 (13)°] of the cation is in the expected range and indicates only weak cation–anion inter­actions. The almost linear [Cl—H—Cl]⁻ anion is a rare example of a symmetric hydrogen bridge in a hydrogen dichloride anion. The Cl⋯Cl distance and two equal Cl—H bonds are typical of such a symmetric hydrogen dichloride anion.

Solvate-free bis-(triphenylphosphine)iminium chloride

The title compound, C₃₆H₃₀NP₂⁺·Cl⁻, crystallized in the solvate-free form from a CH₃CN/OEt₂ solution. The chloride anion and the N atom of the [(Ph₃P)₂N]⁺ cation are located on a twofold axis, yielding overall symmetry 2 for the cation. The central P—N—P angle [133.0 (3)°] is at the low end of the range of observed P—N—P angles.

Bis(triphenylphosphine)iminium bromide acetonitrile monosolvate

The title compound, C₃₆H₃₀NP₂⁺·Br⁻·C₂H₃N, crystallized from a CH₃CN/OEt₂ solution as an acetonitrile solvate. The central P—N—P angle [142.88 (10)°] is significantly larger than in the corresponding chloride and iodide structures.