Halide-capped tellurium-containing macrocycles.
The reaction of 1,1,2,3,3-pentamethyltrimethylenephosphinic acid (cycPO(2)H) with bis(p-methoxyphenyl)tellurium dichloride (1) affords a 12-membered macrocycle [((p-MeOC(6)H(4))(2)Te)(2)(mu-O)(mu-cycPO(2))(mu(4)-Cl)](2) x C(6)H(6) (2) in good yield. The latter reacts with sodium iodide to give [((p-MeOC(6)H(4))(2)Te)(2)(mu-O)(mu-cycPO(2))(mu(4)-I)](2) x 4 C(6)H(6) (3). 2 and 3 are isostructural dicationic macrocycles and contain a Te(4)P(2)O(6) framework. An interesting aspect of both of these structures is that two counter halide atoms are present as capping ligands above and below the macrocyclic plane enabled by Te-X interactions. In contrast to the macrocyclic product obtained with diorganotellurium dihalide the reaction of diphenyltin dichloride with cycPO(2)H resulted in the formation of an oxygen-capped cluster [(PhSn)(3)(mu(3)-O)(mu-cycPO(2))(3)(mu-OH)(3)][cycPO(2)] x CH(3)CN. The latter is formed by a Sn-Ph cleavage reaction.
Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur-208 016, India. vc@iitk.ac.in
Vadapalli
V
Chandrasekhar
Ramalingam
R
Thirumoorthi