XAFS study of ytterbium complexes as new-type Lewis acid catalysts

Authors
Yoshida, T Tanaka, T Yamamoto, T Yoshida, S Ishitani, H Kobayashi, S
Citation
T. Yoshida et al., XAFS study of ytterbium complexes as new-type Lewis acid catalysts, J SYNCHROTR, 6, 1999, pp. 455-457
Citations number
5
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
JOURNAL OF SYNCHROTRON RADIATION
ISSN journal
09090495 → ACNP
Volume
6
Year of publication
1999
Part
3
Pages
455 - 457
Database
ISI
SICI code
0909-0495(19990501)6:<455:XSOYCA>2.0.ZU;2-8
Abstract
Local structures around Yb atoms in chiral ytterbium(III) trifluoromethanes ulfonates (Yb(OTf)(3)) catalysts prepared by a choice of hire types of achi ral ligands were studied by Yb L-3-edge XAFS spectroscopy to explain the di fference of the catalytic performance of the two catalysts. Both the cataly sts were found to be present as trivalent ytterbium oligomer. Curve-fitting analysis of EXAFS showed that Yb-Yb distance of two catalyst complexes is fairly different from each other, i.e., one is 3.68 Angstrom and the other 4.04 Angstrom.