| Abstract
| - A new precursor molecule for chemical modification of oxide surfaces, the trialkynyl(fluoroorgano)tin(IV) (C4H9−C⋮C)3Sn(CH2)2(CF2)7CF3, 1, was synthesized in three steps from tricyclohexyltin hydride.Compound 1 reacted with Biosepra 100 silica to give chain loadings as high as 0.28 mmol·g-1 to becompared to 0.44 mmol·g-1 reached with the trichlorosilane analogue Cl3Si(CH2)2(CF2)7CF3, 2. Themodified powders have been thoroughly characterized using elemental analysis, FTIR spectroscopy, solid-state 29Si, 13C, and 29Si CP-MAS NMR, XPS, and TGA-MS. Irreversible chemisorption took place insolution at room temperature to give a fluorinated chain thin layer, likely a monolayer, via removal ofthree hex-1-yne molecules and formation of Sibulk−O−Sn−C linkages. The chemisorption process involveshydrolysis of the precursor in solution before reaction with the silica surface and led to surface-modifiedsilica thermally stable up to 350 °C. Trialkynylorganotins in solution might be therefore advantageouslyexploited to modify chemically SnO2 or TiO2 surfaces to get dye-sensitized oxide materials able to achievelight-to-electricity conversion.
- Trialkynyltin(fluoroorgano)tin(IV), 1, reacted with Biosepra 100 to give surface-modified materials containing chain loadings as high as 0.28 mmol·g-1, i.e., 1.7 chain·nm-2. Irreversible chemisorption occurred in solution at RT to yield a fluorinated chain monolayer via departure of three hex-1-yne molecules and formation of Sibulk−O−Sn linkages.
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