71 Molecular Stones: Soluble Heterobimetallic Alumo- and Gallosilicates

Wednesday, November 4, 2009: 9:40 AM
Angus (Camino Real Hotel)
Raúl Huerta-Lavorie , Centro de Investigación en Química Sustentable UAEM–UNAM, Toluca, Mexico
Diego Solis-Ibarra , Centro de Investigación en Química Sustentable UAEM–UNAM, Toluca, Mexico
Fernando Rascón-Cruz , Centro de Investigación en Química Sustentable UAEM–UNAM, Toluca, Mexico
Vojtech Jancik , Centro de Investigación en Química Sustentable UAEM–UNAM, Toluca, Mexico
Unique alumo- and gallosilicate precursors LM(OH)(µ-O)Si(OH)(OtBu)2 (1, M = Al; 2, M = Ga; L = HC[CMeN(2,6-iPr2C6H3)]2) [1] and LM[(µ-O)Si(OH)(OtBu)2]2 (3, M = Al;4, M = Ga) have been prepared by the reaction between (HO)2Si(OtBu)2 (and water for compounds 1 and 2) and LAlH2 or LGa(NHEt)2, respectively, in the corresponding molar ratios. Compounds 1 - 4 have proven to be excellent starting materials for the preparation of heterobimetallic systems containing six- or eight-membered inorganic oxide rings. Thus, for the first time, it was possible to stabilize, for example, molecular soluble alumo(gallo)-titanosilicates LM(OTi(NMe2)2)(µ-O)Si(µ-O)(OtBu)2 and [L(µ-O)M(µ-O)Si(µ-O)(OtBu)2]2Ti (M = Al, Ga) and hafno-alumosilicate [LAl{(µ-O)Si(OtBu)2(µ-O)}2]2Hf with a 0.9 nm large spirocyclic inorganic core. Other complexes containing main-group metals, transitional metals or lanthanides will be discussed.

[1] a) V. Jancik, F. Rascón-Cruz, R. A. Toscano, R. Cea-Olivares, Chem. Commun. 2007, 4528. b) F. Rascón-Cruz, R. Huerta-Lavorie, V. Jancik, R. A. Toscano, R. Cea-Olivares,  Dalton Trans., 2009, 1195. c) D. Solis-Ibarra, A. P. Gómora-Figueroa,  N. Zavala-Segovia, V. Jancik, Eur. J. Inorg. Chem. 2009, DOI: 10.1002/ejic.200900540.