92720-47-3Relevant articles and documents
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.
Synthesis and characterization of sterically encumbered Li, Na, and K aryl tellurolates, and some Pt(II), Ir(I), and Cd(II) derivatives
Bonasia, Philip J.,Arnold, John
, p. 147 - 157 (2007/10/02)
The synthesis, isolation, and characterization of several alkali metal aryl tellurolates of general formula (2,4,6-R3C6H2)TeM(sol)n (R = Me, iPr, tBu; M = Li, Na, K; sol = THF, n = 1.33, 1.5, 2.5, 3; sol = DME, n = 1; sol = TMEDA, n = 1; sol = 18-crown-6, n = 1) is reported.Reduction of (2,4,6-Me3C6H2)2Te2 and (2,4,6-iPr3C6H2)2Te2 with 2 equiv of LiEt3BH in THF affords the corresponding lithium tellurolates 1 and 2.Direct Te insertion into the C-Li bond of (2,4,6-tBu3C6H2)Li(THF)3 in THF produces 3, while a similar reaction of Te metal with (o-C6H4CH2NMe2)Li affords the chelating tellurolate, 4.The action of Na/Hg amalgam on THF solutions of (2,4,6-Me3C6H2)2Te2 or (2,4,6-iPr3C6H2)2Te2 followed by work-up with TMEDA or DME leads to the sodium tellurolates 5 and 6 respectively.Treatment of THF solutions of (2,4,6-iPr3C6H2)2Te2 with 2 equiv. of KsBu3BH gives the polymeric tellurolate, (2,4,6-iPr3C6H2)2TeK(THF)1.33, (7).The infinite ladder-like structure is broken by reaction with 18-crown-6, which affords the monomeric derivative, 8.Reaction of 2 or 3 with THF suspensions of cis-(PPh3)2PtCl2 produces the air-stable cis-platinum tellurolates, 9 and 10, respectively.Reaction of 3 with trans-(PPh3)2Ir(CO)Cl, leads to the isolation of 11, a rare example of a Vaska's type complex with a cis-geometry, and only the second such structurally characterized derivative.Reaction of 4 with 1/2 equiv. of CdBr2 produces 12, Cd2.Compounds 3,4,7,10, and 11 have been characterized by single crystal X-ray diffraction.
