Add time:08/27/2019         Source:sciencedirect.com

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 N2 atmosphere results in 1-(4-methoxyphenyltelluro)-2-[3-(6-methyl-2-pyridyl)propoxy]ethane (L1) 2-methyl-6-{3-[2-({2-[3-(6-methyl-2-pyridyl)propoxy]ethyl}telluranyl)ethoxy]propyl}pyridine (L2) as viscous oils. Their proton and carbon-13 NMR spectra are characteristic. The L2 shows signs of decay within few days. The complexes [PdCl2(L1)]2 (1), [PtCl2(L1)]2 (2), [HgBr2(L1)] (3), [PdCl2(L2)]2 (6), [PtCl2(L2)]2 (7) and [(PdCl2)3(L2)2] (8) have been synthesized and found to give characteristic 1H and 13C NMR spectra. 3 on crystallization from acetone:hexane (2:1) mixture gives MeOC6H4HgBr (4) and [RTe+–HgBr2]Br− (R = –CH2CH2OCH2CH2CH2-(2-(6-CH3–C5H3N))) (5). The crystals of 1, 2 and 4 are subjected to X-ray diffraction and their structures are solved. 1 and 2 are 20-membered metallomacrocycles and do not dissociate in solution. The crystals of 1 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) Å, respectively.

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