59 research outputs found
exo-10,11-Dibromotricyclo[6.3.1.02,7]dodeca-2,4,6,9-tetraene
The title compound, C12H10Br2, is a bridged ring system based on a homobenzonorbornadiene framework. The exo configuration of one of the Br atoms was previously assigned via NMR correlations and has now been confirmed by the geometry of the solid-state structure. The compound features a Br—C—C—Br torsion angle of 66.68 (12)°, whereby the C atoms in the calculation are respectively sp
3- and sp
2-hybridized
1,5-(4,4'-Dipyridyl)naphthalene
Sherpa Romeo green journal. Open access article. Creative Commons Attribution 4.0 License (CC BY 4.0) appliesThe title compound has been prepared from 1,5-dibromonaphthalene (obtained
from 1,5-diaminonaphthalene) using Suzuki-Miyaura cross-coupling to 4-pyridylboronic
acid. The crystal and molecular structure was determined by single-crystal X-ray diffraction.Ye
4-hydrazinopyridinium chloride
Sherpa Romeo green journal. Open access article. Creative Commons Attribution License (CC BY) applies.Ye
Crystal structure of a dimeric ß-diketiminate magnesium complex
Sherpa Romeo green journal. Open access article. Creative Commons Attribution License (CC BY) appliesThe solid-state structure of a dimeric ß-diketiminate magnesium(II) complex is
discussed. The compound, di- -iodido-bis[({4-amino-1,5-bis[2,6-bis(propan-2-
yl)phenyl]pent-3-en-2-ylidene}azanido- 2N,N0)magnesium(II)] toluene sesquisolvate,
[Mg2(C29H41N2)2I2] 1.5C7H8, crystallizes as two independent molecules,
each with 2/m crystallographic site symmetry, located atWyckoff sites 2c and 2d.
These have symmetry-equivalent magnesium atoms bridged by -iodide ligands
with very similar Mg—I distances. The two Mg atoms are located slightly below
( 0.5 A ° ) the least-squares plane defined by N–C—C–N atoms in the ligand
scaffold, and are approximately tetrahedrally coordinated. One and one-half
toluene solvent molecules are disordered with respect to mirror-site symmetry at
Wyckoff sites 4i and 2a, respectively. In the former case, two toluene molecules
interact in an off-center parallel stacking arrangement; the shortest C to C0 ( –
) distance of 3.72 (1) A ° was measured for this interaction.Ye
Reversible redox chemistry of anionic imidazole-2-thione-fused 1,4-dihydro-1,4-diphosphinines
Open access article. Creative Commons Attribution 4.0 International License (CC BY 4.0) appliesAnionic 1,4-dihydro-1,4-diphosphinines were synthesized from tricyclic 1,4-diphosphinines and isolated as blue powdery salts M[2a–2c]. Reaction of solutions of these monoanions with iodomethane led to P-methylated compounds 3a–3c. An oxidation/reduction cycle was examined, starting from solutions of K[2a] via P–P coupled product 4a and back to K[2a], and the recyclability and redox chemistry of this cycle were confirmed by experimental and simulated cyclic voltammetry analysis, which is proposed as a potential 2-electron cathode for rechargeable cells. TD-DFT studies were used to examine species that might be involved in the process.Ye
Mono- and bis-imidazolidinium ethynyl cations and the reduction of the latter to give an extended bis-1,4-([3]cumulene)-p-carbo-quinoid system
Sherpa Romeo yellow journal. This is the peer reviewed version. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived VersionsAn extended π-system containing two [3]cumulene fragments separated by a p-carbo-quinoid and stabilized by two capping N-heterocyclic carbenes (NHCs) has been prepared. Mono- and bis-imidazolidinium ethynyl cations have also been synthesized from the reaction of an NHC with phenylethynyl bromide or 1,4bis(bromoethynyl)benzene. Cyclic voltammetry coupled with synthetic and structural studies showed that the dication is readily reduced to a neutral, singlet bis-1,4-([3]cumulene)-p-carbo-quinoid due to the πaccepting properties of the capping NHCsYe
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