889938-91-4Relevant academic research and scientific papers
Structural relationships in high-nuclearity heterobimetallic bismuth-oxo clusters
Mehring, Michael,Paalasmaa, Sanna,Schuermann, Markus
, p. 4891 - 4901 (2005)
The novel heterobimetallic sodium-bismuth-oxo clusters [Bi2- Na4O(OSiMe3)8] (1), [Bi10Na 5O7(OH)6(OSiMe3)15] ·1.5C7H8 (2·1.5C7H8), [Bi15Na3O18(OSiMe3) 12]·C7H8 (3·C7H 8) and [Bi14-Na8O18(OSiMe 3)14(THF)4]·C6H6 (4·C6H6) were prepared starting from BiCl 3 and NaOSiMe3. Compound 1 crystallises in the trigonal space group R3c with the lattice constants a = 12.8844(3) A and c = 54.6565(3) A, compound 2·1.5C7H8 crystallises in the triclinic space group P1 with the lattice constants a = 15.0377(2) A, b = 16.0373(2) A, c = 27.8967(5) A, a = 87.1321(6)°, β = 86.6530(7)° and γ = 63.6617(6)°, compound 3·C 7H8 crystallises in the monoclinic space group C2/c with the lattice constants a = 54.311(11), b = 19.846(4), c = 22.885(5) A and β = 112.32(3)°, and compound 4·C6H6 crystallises in the trigonal space group R3 with the lattice constants a = 15.9786(4) A and c = 46.8329(17) A. The formation of M-O-M bonds results from both partial hydrolysis followed by condensation as well as from elimination of Me3SiOSiMe3 from M-OSiMe3 groups. The hexanuclear metal-oxo silanolate 1 is more conveniently synthesised by the addition of NaOSiMe3 to a toluene solution of in situ-prepared [Bi(OSiMe3)3]. The metal-oxo(hydroxo) silanolates differ significantly in composition, but show similar building units. Thermal decomposition of the metal-oxo silanolates in the solid state gave heterogeneous decomposition products containing bismuth silicates. Wiley-VCH Verlag GmbH & Co. KGaA, 2005.
