Reactions of transition metal-nitrogen .sigma. bonds. 4. Mechanistic studies of carbon dioxide insertion and carbon dioxide exchange reactions involving early transition metal dimethylamido and N,N-dimethylcarbamato compounds

Carbon Dioxide Fixation by Organolanthanides and Thermal Degradation into Amorphous and Higher Condensed Ln/O/C/N Solids

“…[38] Together with additional strong signals between 1480 and 1290 cm -1 these absorptions confirm the formation of carbamates or carbonates. [29,32,38] Especially the shoulders at 1620, 1598, and 1290 cm -1 are in accordance with vibrations observed for other lanthanide carbamates and ammonium carbamate. The C-O deformations can be attributed to the 950-750 cm -1 region.…”

“…The IR spectrum was used as an important reference for further investigations, as it shows vibrations of an oxonitridocarbonate without any metal interaction ( Figure 5). [ 29,32] Additionally, the deformation vibrations of N-H and O-C-N can be located at 1272, 1112, 859, and 695 cm -1 . [29,32] Heterogeneous Solid-Gas Reactivity of [Ce{N(SiMe 3 ) 2 } 3 ] Towards CO 2 The structure of Ce-BTMSA has been determined elsewhere [18] and revealed a mononuclear species with the Ce III ion in the center of the three BTMSA ligands (CN = 3).…”

“…[ 29,32] Additionally, the deformation vibrations of N-H and O-C-N can be located at 1272, 1112, 859, and 695 cm -1 . [29,32] Heterogeneous Solid-Gas Reactivity of [Ce{N(SiMe 3 ) 2 } 3 ] Towards CO 2 The structure of Ce-BTMSA has been determined elsewhere [18] and revealed a mononuclear species with the Ce III ion in the center of the three BTMSA ligands (CN = 3). It has been shown that the central atom displays a disorder in the z direction, occupying two sites positioned above and below the plane formed by the ligand nitrogen atoms.…”

Synthesis and characterization of poly(pyrazolyl)borate tantalum amide complexes and their reactivities toward oxygen

“…Tantalum amides have been actively studied for their fundamental chemistry and potential applications including catalyst precursors for hydroaminoalkylation [1] , catalysts for C-H activation [2] , precursors for insertion reactions [3,4] , and precursors for chemical vapor deposition of microelectronic metal oxides [5][6][7] . Ancillary ligands play a key role in reactivities and functionalization of the metal complexes.…”

“…We earlier reported Ti and Zr amido polypyrazolyborate complexes [19] . In the current work, we have prepared poly(pyrazolyl)borate Ta amide complexes Tp*Ta(NMe 2 ) 4 (2), [Tp*Ta(NMe 2 ) 4 ]·2KTp* (3), and TpTa(NMe 2 ) 4 (5) by the reactions of TaCl(NMe 2 ) 4 (1) [20] with KTp* and KTp, respectively. Interestingly, polypyrazolyborate ligands are found to form one, two, and three Ta-N bonds with the Ta atoms in 2, 5, and 3, respectively.…”