52251-60-2Relevant academic research and scientific papers
Syntheses and Structures of Zinc(tmeda)bis(aryltellurolato) and its Facile Chalcogenospecific Ligand Exchange Reactivity
Behr, Sandra,Bestvater, Thorsten,Feldmann, Arnold,Kirschbaum, Kristin,Conrad, Olaf,Giolando, Dean M.
, p. 1431 - 1438 (2018/09/25)
Anaerobic treatment of Zn(tmeda)Br2, where tmeda denotes N,N,N′,N′-tetramethylethylenediamine, with a solution of Na(TeAr), sodium aryltellurolate, in ethanol in a 1:2 stoichiometry led to the formation of highly air sensitive Zn(tmeda)(TeAr)2 (1–3), while a 1:1 stoichiometry afforded Zn(tmeda)Br(TeAr) (4). Crystallography revealed all complexes to be monomeric with four coordinate central zinc atoms bound to tmeda and two TeAr, or a TeAr and a Br ligand. Upon mixing two symmetrically substituted Zn(tmeda)(TeAr)2 complexes in solution, 125Te NMR revealed a facile ligand exchange providing Zn(tmeda)(TeAr)(TeAr′). In addition, Zn(tmeda)(TeAr)(TeAr′) complexes form on mixing symmetric Zn(tmeda)(TeAr)2 complexes and (TeAr′)2. The lability of the zinc complexes was put to advantage in ligand-substitution reactions wherein treatment of SnCl4 with Zn(tmeda)(TeAr)2 affords Sn(TeAr)4 in excellent yields without the concurrent formation of the redox product (TeAr)2. The apparent lability of the Zn–Te bond prevented the volatilization of 1–3 for their use as chemical vapor deposition precursors for the fabrication of ZnTe thin films. On heating, to volatize the complexes, the complexes decompose to cubic ZnTe and TeAr2 sublimes from the samples. Thermal gravimetric analysis indicates the loss of tmeda followed by the loss of TeAr2.
Technetium complexes with arylselenolato and aryltellurolato ligands
Noschang Cabral,Kirsten,Hagenbach,Piquini,Patzschke,Lang, E. Schulz,Abram
supporting information, p. 9280 - 9286 (2017/07/24)
Reactions of (NBu4)[TcOCl4] or [TcCl3(PPh3)2(CH3CN)] with in situ-prepared lithium arylselenolates and -tellurolates give (NBu4)[TcVO(ArE)4] (E = Se, Te; Ar = phenyl) and [TcIII(ArE)3(PPh3)(CH3CN)] (E = Se, Te; Ar = phenyl, 2,6-Me2phenyl, mesityl) complexes, respectively. The products contain square-pyramidal (TcV compounds) and trigonal bipyramidal (TcIII complexes) coordinated technetium atoms. Density functional theory calculations indicate that the Tc-chalcogen bonds in the TcIII compounds have a greater bond order than those in the TcV compounds.
A TELLURIUM-125 STUDY OF LITHIUM ALKANE- AND ARENETELLUROLATES
Bildstein, Benno,Irgolic, Kurt J.,O'Brien, Daniel H.
, p. 245 - 256 (2007/10/02)
Lithium alkenetellurolates and lithium arenetellurolates were prepared by reduction of ditellurides with lithium in THF.Tellurium-125 chemical shifts of lithium alkenetellurolates , RTeLi (R = Me, Et, n-Pr, i-Pr, n-Bu, i-Bu, s-Bu, and t-Bu) and lithium arenetellurolates, R'-C6H5-TeLi (R' = para-H, Me2N, MeO, Me2CHO, Me, C6H5O, F, Cl, Br, Me3Si; R' = meta-MeO, EtO, Me2N, Me, F; R' = ortho-MeO and Me2N) were determined. Chemical shift trends for alkenetellurolates are compared with those previously reported for dialkyl ditellurides, dilakyl tellurides andbis(alkyltelluro)methanes.The (125)Te shifts of alkenetellurolates plotted versus (77)Se shifts of alkeneselenolates gave an excellent linear correlation.The substituent effects for para- and meta-substituted arenetellurolates are correlated with single- and dual-substituent parameter equations.Single parameter equations gave a poor fit, whereas dual-substituent parameter equations produced good linear correlations.The dual-substituent parameter equation of Taft is slightly better than the two-parameter equation of Swain and Lupton in correlating (125)Te shifts of substituted arenetellurolates.
