Synthesis and molecular structure of niobocene trimethylacetate and its π-complex with diphenylacetylene

Niobium(V) Alkoxides. Synthesis, Structure, and Characterization of [Nb(μ-OCH2CH3)(OCH2C(CH3)3)4]2, {[H3CC(CH2O)(CH2-μ-O)(C(O)2)]Nb2(μ-O)(OCH2CH3)5}2, and {[H3CC(CH2O)2(CH2-μ-O)]Nb(OCH2CH3)2}2 for Production of Mixed Metal Oxide Thin Films1Boyle1, Alam2, Dimos3 et al. 1997Chem. Mater.442300View full textAdd to dashboardCite

“…The M−OR distance of the BHMP ligand (1.87 Å) is in agreement with the terminal M−OEt ligand distances (av 1.88). The angle of ∼126° for the acetate moiety of the BHMP ligand O(6)−C(11)−O(7) of 2 is within the range reported for other niobium complexes with some form of acetate ligand. ,,,, …”

“…20 These distances are all consistent with various literature reports on heteroligated Nb(V) compounds. [31][32][33][34][35][36][37][39][40][41][42][43][44][45][46][47][48][49][50][51][52][53][54][55][56][61][62][63][64] The Nb-(µ-OR) distances and the (µ-O)-Nb-(µ-O) angles [1 (69.4°), 2 (72.9°), and 3 (71.3°)] are approximately the same for the three compounds. Furthermore, 1 and 3 have nearly identical nonbonding Nb--Nb distances (3.516 and 3.459 Å, respectively) in agreement with the OMe structure; whereas for 2 the M--M distance is significantly reduced to 3.241 Å, an indication of the geometrical constraints imposed by the oxide and acetate-like moiety of the BHMP ligand.…”

“…The angle of ∼126°for the acetate moiety of the BHMP ligand O(6)-C(11)-O(7) of 2 is within the range reported for other niobium complexes with some form of acetate ligand. 45,51,61,63,64 FT-IR Spectroscopy. The FT-IR spectra were obtained for Nb(OEt) 5 (neat, NaCl plates) and the resulting powders of 1-3 (KBr pellet).…”

New reactivity of . Synthesis, electrosynthesis and reactivity of new carboxylato niobocene complexes

“…The sixmembered aromatic ring and the two carboxylato groups are coplanar, although the niobium atom is out of the plane defined by O1, O2, C1, C2, C3 and C4 (by 0.156(6) Å ). The two oxygen atoms of the bidentate carboxylato ligand have similar Nb-O bond distances (2.220(4) and 2.230(4) Å for O1 and O2, respectively) and these values are in reasonable agreement with those reported for the carboxylato ligands [11]. The cyclopentadienyl groups are in a typical eclipsed fashion with respect to each other and the SiMe 3 groups are in a trans disposition.…”

Synthesis, electrochemistry and reactivity of formato– and acetato–niobocene complexes

“…The v(N=C=C) band for the ketenimine ligand in 13 appears at 1588 cm-' which is in accordance with data previously reported for other ketenimine complexes where a q2-(C,N) co-ordination mode was found.," Finally, the IR v(C=N) iminoacyl absorption for 17 appears at 1580 cm-' in accord with previously reported values for structurally characterized q2-iminoacyl complexes.4c Similar to complexes 4-6, the 'H and 13C NMR data (see Experimental section) for 10-17 agree with a lack of symmetry in their structures (c). For complex 13 two isomers E and Z are obtained in a ratio 80 : 20 similar to other analogous ketenimine-halogeno complexes. The 13C resonances for the acetate carbon atom appear at ca.…”