Synthesis, characterization, and acceptor behavior of dichlorotris(2-t-butylphenoxo)niobium(V)

Abstract

The reaction of niobium pentachloride with three equivalents of 2-t-butylphenol in carbon tetrachloride afforded [NbCl 2 (OC 6 H 4 C(CH 3 ) 3 -2) 3 ]. The identity of the complex has been established by elemental analyses, molar conductance, molecular weight determination, IR, 1 H, and 13 C-NMR and UV-Vis spectral studies. Based upon these studies, a square-pyramidal geometry around niobium has been proposed. Thermal behavior of the complex has been studied by TGA and DTA. Acceptor behavior of [NbCl 2 (OC 6 H 4 C(CH 3 ) 3 -2) 3 ] toward Ph 3 P, Ph 3 As, Ph 3 PO, Ph 3 AsO, and an uncommon ligand arsenictrithiophenoxide As(SPh) 3 allows the isolation of 1 : 1 addition compounds as shown by physicochemical, IR, and 1 H-NMR spectral studies. The formation of [NbCl 2 (OC 6 H 4 C(CH 3 ) 3 -2) 3 ] Á As(SPh) 3 appears to be the first adduct of its class and suggests the suitability of As(SPh) 3 as a ligand.

Thermal decomposition of [LiNb(OC6H3Me2-2,4)6] as potential single source molecular precursor LiNbO3 nanopowder: Structural and dielectric studies

“…29 Despite the fact that numerous reports describe the preparation, characterization and potential applications of LiNbO3, there is continuous search for new improved precursors, simple preparative methods and fascinating properties in material science. In continuation of our interest on niobium aryloxides, [30][31][32][33][34] we herein report the synthesis and characterization of new heterometallic lithium niobium aryloxide [LiNb(OC6H3Me2-2,4)6] and its exploration as single-source precursor to lithium niobate nanopowder by TG-DTA techniques. The FT-IR, XRD and SEM methods have established the formation of LiNbO3.…”