Linked Life Data

20066231

Source:http://linkedlifedata.com/resource/pubmed/id/20066231

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
3
pubmed:dateCreated
2010-1-12
pubmed:abstractText
Data from potentiometric titrations of Eu(CF(3)SO(3))(3) by Me(4)NOH in 80% v/v DMSO/water agree equally well with formation of two sets of hydroxo complexes: either Eu(2)OH(5+) and Eu(OH)(n)(3-n) (n = 1-3) or Eu(2)OH(5+), Eu(2)(OH)(2)(4+), Eu(2)(OH)(5)(+) and Eu(OH)(3). Studies using direct excitation luminescence spectroscopy and time-resolved decay measurements of Eu(III) solutions containing increasing amounts of hydroxide as well as luminescence resonance energy transfer studies between Tb(III) and Eu(III) in the presence of added hydroxide support the second model with predominantly binuclear hydroxo complexes. The luminescence lifetimes of hydroxo complexes are much shorter than those of Eu(III) complexes solvated by DMSO-water mixtures and even shorter than for Eu(III) aqua complexes, but are larger than those reported for hydroxo complexes in water. This indicates possible preferential solvation by DMSO of both free Eu(III) cation and its hydroxo complexes. Kinetic studies of the cleavage of two model phosphodiesters by Eu(III) triflate in the same medium shows that reactive species are higher order hydroxo complexes Eu(2)(OH)(5)(+) and Eu(OH)(3). Reactions with Eu(OH)(3) are second or third order in the complex indicating involvement of bi or trinuclear species as the reactive forms.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Jan
pubmed:issn
1477-9234
pubmed:author
pubmed:issnType
Electronic
pubmed:day
21
pubmed:volume
39
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
864-73
pubmed:meshHeading
pubmed:year
2010
pubmed:articleTitle
Speciation of Eu(III) hydroxo complexes in aqueous DMSO studied by direct excitation luminescence spectroscopy and their catalytic activity in phosphodiester cleavage.
pubmed:affiliation
Facultad de Química, Universidad Nacional Autónoma de México, 04510, México D.F., México.
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, Non-P.H.S., Research Support, Non-U.S. Gov't