Glycosylidene Carbenes. Part 27. Glucosidation of titanium dioxide with 1-aziglucoses: Preparation and characterization of modified titanium-dioxide surfaces

✍ Scribed by Martin Weber; Andrea Vasella; Marcus Textor; Nicholas D. Spencer

• Publisher: John Wiley and Sons
• Year: 1998
• Tongue: German
• Weight: 881 KB
• Volume: 81
• Category: Article
• ISSN: 0018-019X
• DOI: 10.1002/hlca.19980810546

✦ Synopsis

Titanium-dioxide surfxes have been glycosylatcd with the benzyl-, 4-fluorobenzyl-. and acetyl-protected diwirines 1 3. The modified TiO, surfaces were characterized by contact-angle measurement, X-ray photoelecii-011 specti-ohcopy (XPES), and time-of-flight secondary-ion mass spectrometry (ToF-SIMS). The main by-products of thc glucosidation (mostly azines and trehaloses) were identified. Their physisorption slightly reduces the cflicicncy of the glucosidation by 1 mM solution of 1 or 2 in CH,CI,, but this influence is neutralized by repeating 1hc glucosidation, o r by using a 100 mM solution of the diairines. The immobilized, acetylated glucosyl moieties w r c dcacetylatcd itr .tiru Calculations based on the XPES peaks of Ti 2p and F Is for the TiO, surface modified v.ith 2 indicated 1.5 0.9 immobili7ed glucosyl moieties per nm'.

I ) Part 26: [l]

*) The reaction of TiO, with CH,N, has been described by Boehrn [8].