C. Nedez et al., SURFACE ORGANOMETALLIC CHEMISTRY OF TIN - CONTROLLED THERMAL TRANSFORMATION IN VACUO OF SN(N-C4H9)(3) FRAGMENTS GRAFTED ON THE SURFACE OF ALUMINA, Journal of the Chemical Society. Faraday transactions, 92(18), 1996, pp. 3419-3423
Citations number
13
Categorie Soggetti
Chemistry Physical","Physics, Atomic, Molecular & Chemical
The thermal transformation in vacuo of the well defined surface organo
metallic fragments [AlO]Sn-x(n-C4H9)(3) (x = 1, 2) 1 grafted on variou
s partially dehydroxylated aluminas (alpha, gamma, eta) has been inves
tigated. The surface reactions were followed by qualitative and quanti
tative determination of the evolved gases including IR spectroscopy, C
-13 cross-polarisation magic angle spinning and Sn-119 magic angle spi
nning NMR studies. On all aluminas, comparable transformations of 1 we
re identified showing that the ratio of octahedral: tetrahedral alumin
ium sites in the aluminas is not an important parameter. Solvolysis re
actions of 1 led to the formation of the surface multigrafted species
(AlO)(x+z)SnBu(3-z) (x = 1, 2; z = 1, 2, 3), while beta-H elimination
of but-1-ene followed by reductive elimination led to inorganic tin(II
) compounds on the surface of the alumina. These transformations occur
at temperatures lower than those observed with =SiOSnBu(3) grafted on
the surface of silica. This is possibly related to the more acidic pr
operties of alumina or to the higher concentration and/or mobility of
Al hydroxy groups with respect to Si hydroxy groups.