Bali, Sumit, Singh, Ajai K., Drake, John. E. and Light, Mark. E. (2006) Multidentate hybrid organotellurium ligands 1-(4-methoxyphenyltelluro)-2-[3-(6-methyl-2-pyridyl)propoxy]ethane (L-1) 2-methyl-6-{3-[2-({2-[3-(6-methyl-2-pyridyl)propoxy]-ethyl}telluranyl)et hoxy]propyl}pyridine (L-2) and their metal complexes: formation of 20-membered metallomacrocycle by L-1. Polyhedron, 25 (4), 1033-1042. (doi:10.1016/j.poly.2005.12.010).
Abstract
4-MeOC6H4Te-Na+ and Te2- generated in situ by reduction of (4-MeOC6H4Te)(2) and elemental Te, respectively, with sodium borohydride on reaction with 2-[3-(2-chloroethoxy)propyl]-6-methylpyridine in N-2 atmosphere results in 1-(4-methoxyphenyltelluro)-2-[3-(6-methyl-2-pyridyl)propoxy]ethane (L-I) 2-methyl-6-{3-[2-({2-[3-(6-methyl-2-pyridyl)propoxy]ethyl}telluranyl)eth oxy]propyl}pyridine (L 2) as viscous oils. Their proton and carbon-13 NMR spectra are characteristic. The L 2 shows signs of decay within few days. The complexes [PdCl2(L-I)](2) (1), [PtCl2(L-I)](2) (2), [HgBr2(L-I)] (3), [PdCl2(L-2)](2) (6), [PtCl2(L-2)](2) (7) and [(PdCl2)(3)(L-2)(2)](8) have been synthesized and found to give characteristic 1 H and 13 C NMR spectra. The 3 on crystallization from acetone:hexane (2: 1) mixture gives MeOC6H4HgBr (4) and [RTe+-HgBr2]Br- (R = -CH2CH2OCH2CHCH2-(2-(6-CH3-C5H3N))) (5). The crystals of 1, 2 and 4 are subjected to X-ray diffraction and their structures are solved. The I and 2 are 20-membered metallomacrocycles and do not dissociate in solution. The crystals of I and 2 have chloroform and benzene, respectively, in the lattice whereas 4 is a linear ArHgBr type species. The Pd/Pt in 1 and 2 has square planar geometry. The Pd-Te and Pd-N bond lengths in 1 are 2.530(1)/2.5313(9) and 2.097(4) and 2.101(4) angstrom, respectively.
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