View : 203 Download: 0

Full metadata record

DC Field Value Language
dc.contributor.author안병태-
dc.contributor.author엄익환-
dc.date.accessioned2016-08-28T11:08:31Z-
dc.date.available2016-08-28T11:08:31Z-
dc.date.issued2000-
dc.identifier.issn0253-2964-
dc.identifier.otherOAK-529-
dc.identifier.urihttp://dspace.ewha.ac.kr/handle/2015.oak/218696-
dc.description.abstractSecond-order rate constants have been measured spectrophotometrically for the hydrolysis of p-nitrophenyl acetate (PNPA) and p-nitrophenyl diphenylphosphinate (PNPDPP) with MO4 2- (M = Cr, Mo and W) in phosphate buffer (pH = 8.00) at 35.0 °C. These MO4 2- species exhibit large catalytic effect in the hydrolysis of PNPA and PNPDPP except WO4 2- in the reaction with PNPA. The catalytic effect of these MO4 2- species has been observed to be much more significant in the hydrolysis of PNPDPP than in the hydrolysis of PNPA. Since the smallest CrO4 2- would be most highly solvated by H2O molecules, CrO4 2- is expected to exhibit the least catalytic effect, if solvation effect is the most important factor. However, in fact, CrO4 2- shows the highest catalytic effect toward PNPA, indicating that solvation effect is not solely responsible for the catalytic effect. The most basic CrO4 2- shows the highest catalytic effect, while the least basic WO4 2- is least reactive toward PNPA, indicating that the basicity of MO4 2- might be an important factor. However, in the hydrolysis of PNPDPP, no correlation is observed between the basicity and catalytic effect, suggesting that basicity alone can not be responsible for the catalytic effect shown by the MO4 2- species. Formation of a chelate is suggested to be responsible for the high catalytic effect of MO4 2- in the hydrolysis reaction of PNPA and PNPDPP. The formation of chelate is considered to be more suitable for the reaction with PNPDPP than with PNPA based on the larger catalytic effect observed in the reaction with PNPDPP than with PNPA.-
dc.languageEnglish-
dc.titleCatalytic effect of MO4 2- (M=Cr, Mo and W) on hydrolyses of carbon and phosphorus esters-
dc.typeArticle-
dc.relation.issue9-
dc.relation.volume21-
dc.relation.indexSCIE-
dc.relation.indexSCOPUS-
dc.relation.indexKCI-
dc.relation.startpage905-
dc.relation.lastpage908-
dc.relation.journaltitleBulletin of the Korean Chemical Society-
dc.identifier.wosidWOS:000089798000013-
dc.identifier.scopusid2-s2.0-0034692396-
dc.author.googleAhn B.-T.-
dc.author.googlePark H.-S.-
dc.author.googleLee E.-J.-
dc.author.googleUm I.-H.-
dc.contributor.scopusid안병태(55426317800;24315839600)-
dc.contributor.scopusid엄익환(7006725706;6506759437)-
dc.date.modifydate20170601135413-
Appears in Collections:
자연과학대학 > 화학·나노과학전공 > Journal papers
Files in This Item:
There are no files associated with this item.
Export
RIS (EndNote)
XLS (Excel)
XML


qrcode

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

BROWSE