Abstract
Vitamin B12-TiO2 heterogeneous hybrid catalyst (B12-TiO2) mediated ring-expansion reactions and their reaction mechanism were clarified by various spectroscopic methods. Diffuse reflectance UV/VIS (DR-UV/VIS) studies showed that B12-TiO 2 was activated to form the supernucleophilic Co(i) species of B 12 by irradiation with ultraviolet light. DR-UV/VIS and electron spin resonance (ESR) studies then elucidated the formation of the photo-sensitive intermediate on heterogeneous surfaces. The photo-excited B12- TiO2 catalyzed ring-expansion reactions were efficient and eco-friendly. This catalytic efficiency was strongly dependent on the kind of solvent. The oxidation reaction of the solvent by holes at TiO2 nanoparticle surfaces had a crucial role in the overall catalytic reaction.
| Original language | English |
|---|---|
| Pages (from-to) | 3302-3307 |
| Number of pages | 6 |
| Journal | Dalton Transactions |
| Volume | 39 |
| Issue number | 13 |
| DOIs | |
| Publication status | Published - Mar 23 2010 |
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All Science Journal Classification (ASJC) codes
- Inorganic Chemistry
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Photo-induced ring-expansion reactions mediated by B12-TiO 2 hybrid catalyst. / Izumi, Shin Ichiro; Shimakoshi, Hisashi; Abe, Masaaki; Hisaeda, Yoshio.
In: Dalton Transactions, Vol. 39, No. 13, 23.03.2010, p. 3302-3307.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Photo-induced ring-expansion reactions mediated by B12-TiO 2 hybrid catalyst
AU - Izumi, Shin Ichiro
AU - Shimakoshi, Hisashi
AU - Abe, Masaaki
AU - Hisaeda, Yoshio
PY - 2010/3/23
Y1 - 2010/3/23
N2 - Vitamin B12-TiO2 heterogeneous hybrid catalyst (B12-TiO2) mediated ring-expansion reactions and their reaction mechanism were clarified by various spectroscopic methods. Diffuse reflectance UV/VIS (DR-UV/VIS) studies showed that B12-TiO 2 was activated to form the supernucleophilic Co(i) species of B 12 by irradiation with ultraviolet light. DR-UV/VIS and electron spin resonance (ESR) studies then elucidated the formation of the photo-sensitive intermediate on heterogeneous surfaces. The photo-excited B12- TiO2 catalyzed ring-expansion reactions were efficient and eco-friendly. This catalytic efficiency was strongly dependent on the kind of solvent. The oxidation reaction of the solvent by holes at TiO2 nanoparticle surfaces had a crucial role in the overall catalytic reaction.
AB - Vitamin B12-TiO2 heterogeneous hybrid catalyst (B12-TiO2) mediated ring-expansion reactions and their reaction mechanism were clarified by various spectroscopic methods. Diffuse reflectance UV/VIS (DR-UV/VIS) studies showed that B12-TiO 2 was activated to form the supernucleophilic Co(i) species of B 12 by irradiation with ultraviolet light. DR-UV/VIS and electron spin resonance (ESR) studies then elucidated the formation of the photo-sensitive intermediate on heterogeneous surfaces. The photo-excited B12- TiO2 catalyzed ring-expansion reactions were efficient and eco-friendly. This catalytic efficiency was strongly dependent on the kind of solvent. The oxidation reaction of the solvent by holes at TiO2 nanoparticle surfaces had a crucial role in the overall catalytic reaction.
UR - http://www.scopus.com/inward/record.url?scp=77949495412&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=77949495412&partnerID=8YFLogxK
U2 - 10.1039/b921802e
DO - 10.1039/b921802e
M3 - Article
C2 - 20449460
AN - SCOPUS:77949495412
VL - 39
SP - 3302
EP - 3307
JO - Dalton Transactions
JF - Dalton Transactions
SN - 1477-9226
IS - 13
ER -