Nanocrystalline mesoporous tin dioxide materials have been obtained through the controlled hydrolysis of bis(2-methylbutan-2-oxy)di(pentan-2,4-dionato)tin followed by a thermal treatment at 400-550 °C. These materials have been carefully characterized by elemental analysis, FTIR, TGA-MS, XRD, MET, N 2 adsorption, and thermoporometry. They are composed of a porous network of aggregated nanoparticles with a mesoporosity arising from the interparticle space. A careful tuning of both hydrolysis ratio and calcination temperature allowed the preparation of powders with Brunauer-Emmett-Teller surface areas ranging from 50 to 150 m 2 ‚g -1 , an average pore size between 45 and 100 Å, and a mean particle size ranging from 60 to 180 Å. The higher hydrolysis ratio favored the formation of mesoporous solids with high surface areas and low mean pore size diameter. The powders prepared at 550 °C might be advantageously used as semiconducting oxide materials in dye-sensitized photovoltaic devices.
Metalation of diorganostannanes
R1
2SnH2 by lithium
diisopropylamide afforded the
corresponding (hydridodiorganostannio)lithiums,
R1
2SnHLi, which were stable at
low
temperature. Further reaction with alkyl halides led to functional
unsymmetrically
substituted alkyldiorganostannanes,
R1
2R2SnH. Tin hydrides
with an ω-unsaturated
substituent were stable at room temperature. With a 4-pentyl
chain, they underwent a
specific cyclization process, giving a stannacyclohexane under radical
reaction conditions.
A tin hydride with a tin−silicon bond could also be prepared.
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