Predicted group 4 tetra-azides M(N3)(4) (M = Ti-Hf, Th): the first examples of linear M-NNN coordination.

Preparation and Characterization of the First Binary Titanium Azides, Ti(N3)4, [P(C6H5)4][Ti(N3)5] and [P(C6H5)4]2[Ti(N3)6] and on Linear Ti-N-NN Coordination

When does gold behave as a halogen? Predicted uranium tetraauride and other MAu4 tetrahedral species, (M = Ti, Zr, Hf, Th).

Quantum chemical calculations suggest that a series of molecules with the general formula MAu4 are stable, where M = U, Th, and a group-4 atom. They correspond to Au in the formal valence state -1 and indicate that gold can act as a ligand similar to the halogen series. Of the MAu4 species studied, UAu4, the first predicted mixed gold uranium compound, has a short M-Au bond distance, 2.71 A, wh...

Preparation and Characterization of the First Organosulfonium Azides

The chemistry of the chalcogen azides has been well investigated in the last years [1]. Among the various possible oxidation states of the chalcogens, selenium(IV) and tellurium(IV) possess the highest stability, and the ionic chalcogen(IV) azides [R3Te]N3 and [R3Se]N3 have been described and thoroughly characterized recently [2, 3]. In addition, the first telluronium, selenonium and sulfonium ...

Synthesis and Characterization of Tetraphenylphosphonium Tetraazidoborate

The chemistry of boron azides, first reported by E. Wiberg et al. in 1954 [1], was further investigated by P. I. Paetzold [2 4], and the field has been reviewed [5, 6]. Structural and spectroscopic data for boron dichloride azide (trimeric) [7, 8] and dimethylboron azide have been reported in the literature [9]. Quite recently, additional boron azides have been reported and structurally charact...

Group 4 metal complexes with new chiral pincer NHC-ligands: synthesis, structure and catalytic activity.

Chiral group 4 NHC-metal complexes were prepared in good yields by amine elimination from M(NR2)4 (M = Ti, Zr, Hf; R = Me, Et) and chiral pincer NHC-ligands, L4(L4a and L4b), L5 and L6, which are derived from (S,S)-diphenyl-1,2-ethanediamine. Treatment of M(NR2)4 with 1 equiv. of L4 in THF gives, after recrystallization from a benzene solution, the chiral titanium amides (L4)Ti(NMe2)(Br)(THF) (...