Regiospecific Methylalumination of Silacyclopropenes: The Access to Z-1-Silyl-2-Aluminyl-Disubstituted Olefins.

A methodology to access Z-1-silyl-2-aluminyl-disubstituted olefins is developed. It relies on the uncatalyzed ring opening of silacyclopropenes in the presence of a stoichiometric amount of trimethylaluminum. The resulting heterosubstituted alkenes exhibit a particular interaction between the electron-rich [Si-CH] moiety and the electron-deficient diorganoaluminyl group, resulting in similar geometrical features due to the proximity of these two centers.

Game of Crowns: Na Is Coming! Red NIR-Emissive Hybrid Liquid Crystals Containing Discotic Crown Ethers and NaMoXCl (X = Cl or Br).

Molecular or supramolecular materials that can self-organize into columns such as discotic liquid crystals are of interest for several applications in the field of optoelectronics. We show in this work that red near-infrared (NIR)-emissive metal cluster compounds of general formula NaMoXCl (X = Cl or Br) can be readily complexed with discotic liquid crystals containing a crown ether. Three cavity sizes have been tested with crown ethers bearing 4, 5, or 6 oxygen atoms.

Investigation of Intermetallic Energy Transfers in Lanthanide Coordination Polymers Molecular Alloys: Case Study of Trimesate-Based Compounds.

Reactions in water at ambient temperature and pressure between a lanthanide ion and benzene-1,3,5-tricarboxylate (or trimesate) lead to two series of iso-structural coordination polymers. Their general chemical formula is [Ln(tma)(HO)] for the lightest lanthanide ions (Ln = La-Dy except ), while it is [Ln(tma)(HO)·3.5HO] for the heaviest ones (Ho-Lu plus Y).

Combined NMR and X-ray diffraction study of structural aspects, dynamics and charge ordering mechanism in LiVOPO.2HO intercalation compounds.

We carried out a detailed investigation of the local ordering and dynamics of the lithium intercalation in paramagnetic LiVOPO.2HO (with 0 < x ≤ 1) materials. This question was addressed using a combination of X-ray diffraction, P and Li MAS NMR experiments.