Tellurasiloxane cages containing Te(6)Si(4)O(12) and Te(6)Si(6)O(15) frameworks.
Reaction of the silanetriol t-BuSi(OH)(3) with (p-Me(2)NC(6)H(4))(2)TeO in a 4:6 ratio resulted in the formation of [((p-Me(2)NC(6)H(4))(2)Te)(6)(t-BuSiO(3))(4)].1.5 C(7)H(8) (1.1.5C(7)H(8)). In contrast, the reaction of tetrahydroxy-1,3-disiloxane, [t-BuSi(OH)(2)](2)O with (p-MeOC(6)H(4))(2)TeO in a 3:6 ratio afforded [((p-MeOC(6)H(4))(2)Te)(6)(t-BuSi)(6)O(15)] . 2 C(7)H(8) (2.2C(7)H(8)). 1 possesses a tetrahedron cage structure in which the vertices of the tetrahedron are occupied by silicon atoms. Each pair of silicon atoms is connected to each other by a R(2)TeO(2) motif. The six O-Te-O bridges occupy the edges of the tetrahedron. In contrast to 1, the structure of 2 can be described as a trigonal prismatic cage. The latter consists of two Te(3)Si(3)O(6) rings that are interconnected to each other through three Si-O-Si linkages. The structure of 2 is reminiscent of a double-six-ring (D6R) secondary building unit (SBU) framework found in zeolites such as faujasite. Reaction of (p-Me(2)NC(6)H(4))(2)TeO or (p-MeOC(6)H(4))(2)TeO with the disiloxane-1,3-diol, [Ph(2)Si(OH)](2)O in a 2:2 ratio afforded [((p-Me(2)NC(6)H(4))(2)Te)(OPh(2)Si-O-SiPh(2)O)](2) (3) and [((p-MeOC(6)H(4))(2)Te)(OPh(2)Si-O-SiPh(2)O)](2).CH(3)CN (4.CH(3)CN). In contrast to 1 and 2, the compounds 3 and 4 contain puckered 12-membered Te(2)Si(4)O(6) rings.
Department of Chemistry, Indian Institute of Technology-Kanpur, Kanpur 208016, India. vc@iitk.ac.in
Vadapalli
V
Chandrasekhar
Ramalingam
R
Thirumoorthi