Re-investigation of optical sensing properties of boronic-acid-appended ReI complexes for saccharides
- 14 January 2000
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society, Perkin Transactions 1
- No. 3,p. 407-413
- https://doi.org/10.1039/a906708f
Abstract
A number of unanswered questions occurred to us upon reading a communication by Yam and Kai (ref. ) which had reported optical sensing properties of a boronic-acid-appended ReI complex for saccharides. Careful re-examination has disclosed that the pKa-value proposed by them (5.9) is wrong and that the saccharide-binding mode at pH above the pKa is totally different from that at pH below the pKa. The absorption spectral change, which reflects an sp2-to-sp3 boron hybridisation change induced by the saccharide complexation, was observed only at pH below the pKa, and the CD band, which reflects the formation of 1∶1 cyclic complexes, appeared only at pH above the pKa. The results imply that the optimum pH should be carefully selected for the precise optical sensing of saccharides.Keywords
This publication has 0 references indexed in Scilit: