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Please use this identifier to cite or link to this item: http://eprint.iitd.ac.in/handle/2074/305

Title: Hybrid (Te, O) ligands 2- (phenyltelluromethyl) tetrahydro-2H-pyran (L1) and 2-(2-{4-methoxyphenyl} telluorethyl)- 1,3-dioxane (L2), and their palladium(II) and platinum (II) complexes
Authors: Batheja, Raman
Singh, Ajai K
Keywords: 2-(phenantelluromethyl) tetrahydro-2H-pyran
palladium 2-(2-{4-methoxyphenyl}telluroethyl)
1,3-dioxane
platinum complex
ligand
hybrid
Issue Date: 1997
Citation: Polyhedron, 16(14), 2509-2516
Abstract: The nucleophilic reaction of in situ generated [ArTe-] with appropriate organic halides has been used to synthesize 2-(phenyltelluromethyl)-tetrahydro-2H-pyran (L') and 2-(2-{4- ethoxyphenyl} telluorethyl-1,3-dioxane (L2). Their complexes with stoichiometries [MC12(L)z],[M(L)2](CIO4)z, [M(DPPE)(L)2](C104)2, [M(PPh3)2(L)2](C104)2 and [M(phen)(L)2](C104)2 [where M = Pd" or ptu; L = L I or L 2, DPPE = 1,2-bis(di- phenylphosphino)ethane], have been synthesized. Molecular weight, conductance measurements, IR, UV- visible,H,25Te-{lH} and 31p-{IH} NMR spectra have been used to characterize L t, L 2 and their complexes. Ligation of the two (Te,O) ligands, in all the complexes, except [M(L)2](C104)2, is in the monodentate mode through tellurium only. [PtC12(L)2]-type complexes exist in solution as a mixture of cis and trans isomers, the latter being present in very high abundance. The complexes [PdC12(L)2] exhibit only one v(Pd--C1) between 340 and 350 cm-% consistent with a trans structure. The ~J(Pt--Te) values (658-704 Hz) in the 125Te NMR spectra of [Pt(L)2](C104)2 and [Pt(PPh3)2(L)2](CIO4)2 correspond to trans structures, which are supported in the second type of complexes by ~J(Pt--P) (ca 3000 Hz). The 31p NMR spectral data indicate that the mixed ligand complexes of Pd" and Pt n containing PPh3 and DPPE are isostructural. The chelate shifts in the ~25Te NMR spectra have been found to be large and positive (113-127 ppm) when five-membered chelate rings are formed, but for six-membered chelation the shift is small and negative ( - 1 5 to 19 ppm). The quenching of ~O2 by [Pd(phen)(L)2](ClO4)2 has been observed.
URI: http://eprint.iitd.ac.in/dspace/handle/2074/305
Appears in Collections:Chemistry

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