Tellurated heterocycles, 2-[(2-thienyltelluro)methyl]tetrahydrofuran (L-1) and [(2-thienyltelluro)methyl]tetrahydro-2H-pyran (L-2): synthesis and complexation reactions with Pd(II), Pt(II), Hg(II), Ru(II) and Cu(I) single crystal structures of [Ru(p-cymene)Cl-2(L-1)] and cis-[PdCl2(L-2)(2)]
Bali, Sumit, Singh, Ajai K., Drake, J.E., Hursthouse, M.B. and Light, M.E. (2006) Tellurated heterocycles, 2-[(2-thienyltelluro)methyl]tetrahydrofuran (L-1) and [(2-thienyltelluro)methyl]tetrahydro-2H-pyran (L-2): synthesis and complexation reactions with Pd(II), Pt(II), Hg(II), Ru(II) and Cu(I) single crystal structures of [Ru(p-cymene)Cl-2(L-1)] and cis-[PdCl2(L-2)(2)]. Journal of Organometallic Chemistry, 691, (18), 3788-3796. (doi:10.1016/j.jorganchem.2006.05.033).
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2-Thienyllithium (ThLi) reacts with elemental Te to give ThTeLi which on reaction with tetrahydrofurfurylchloride and 2-(bromomethyl) tetrahydro-2H-pyran at -78 degrees C results in L-1 and L-2. Their complexes [PdCl2(L-1)(2)] (1), [PtCl2(L-1)(2)](2), [HgBr2(L-1)(2)](3), [Ru(p-cym-ene)Cl-2(L-1)] (4), [CuBr(L-1)] (5), [PdCl2(L-2)(2)](6), [PtCl2(L-2)(2)](7), [HgBr2(L-2)(2)](8) and [Ru(p-cymene)Cl-2(L-2)] (9). Both the ligands and all nine complexes have characteristic H-1 and C-13 NMR spectra which reveal that in most of the complexes the two ligands L-1 and L-2 coordinate through Te only. This is corroborated by single crystal structures of 4 and 6. The 4 is a half sandwich compound, in which coligands of p-cymene are Cl and L-1 (monodentate coordinated through Te). The Ru-Te bond length is 2.6340(7) Å. In the 6 Pd has nearly square planar geometry and molecules of ligand L-2 are cis to each other, which is something rare with the monodentate telluride ligands. The Pd-Te bond lengths are 2.538(2) and 2.517(2) Å. The crystal structure of 6 also shows presence of secondary (TeCl)-Cl-. . . interactions in the crystal lattice. The Pd-Pd distance in 6 becomes 3.188(3) Å, less than 3.26 Å (sum of vander Waal's radii). The ligation of L-1 and L-2 is compared with those of related ligands.
|Keywords:||2-[(2-thienyltelluro)methyl]tetrahydrofuran, [(2-thienyltelluro)methyl] tetrahydro-2h-pyran, metal complexes, synthesis, single crystal structure, x-ray diffraction n-(2-(4-methoxyphenyltelluro)ethyl)morpholine l-1, organotellurium ligands, ruthenium(ii) complexes, platinum(ii) complexes, x-ray, palladium(ii), chemistry, ligation, diffraction|
|Subjects:||Q Science > QD Chemistry|
|Divisions:||University Structure - Pre August 2011 > School of Chemistry
|Date Deposited:||28 Feb 2007|
|Last Modified:||01 Jun 2011 11:49|
|Contributors:||Bali, Sumit (Author)
Singh, Ajai K. (Author)
Drake, J.E. (Author)
Hursthouse, M.B. (Author)
Light, M.E. (Author)
|Contact Email Address:||email@example.com|
|RDF:||RDF+N-Triples, RDF+N3, RDF+XML, Browse.|
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