Linked Life Data

16900563

Source:http://linkedlifedata.com/resource/pubmed/id/16900563

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
9
pubmed:dateCreated
2006-9-11
pubmed:abstractText
The photophysical properties of three dendrimers containing a p-terphenyl core with appended sulfonimide branches of different size and n-octyl chains have been investigated in dichloromethane solution. In the dendrimer absorption spectra contributions from both the branches and the core are clearly identified. The fluorescence spectra show only the characteristic fluorescence of the terphenyl unit. Energy transfer from the appended chromophoric groups to the core does not occur. In the dendrimers, the terphenyl core exhibits a very high fluorescence quantum yield (ca. 0.75) and a short emission lifetime (0.8 ns). These properties allowed investigations of the fluorescence depolarization caused by rotation of the dendrimers. The dendrimers show a very high steady-state anisotropy in dichloromethane solution at room temperature (0.24 for the largest one), compared to that of the parent terphenyl under the same experimental conditions (<0.01) and in rigid matrix (0.33). Both the n-octyl chains and the sulfonimide branches play important roles to slow down the molecular rotation.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Sep
pubmed:issn
1439-4235
pubmed:author
pubmed:issnType
Print
pubmed:day
11
pubmed:volume
7
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
1980-4
pubmed:meshHeading
pubmed:year
2006
pubmed:articleTitle
A photophysical study of terphenyl core oligosulfonimide dendrimers exhibiting high steady-state anisotropy.
pubmed:affiliation
Dipartimento di Chimica "G. Ciamician", Università di Bologna via Selmi 2, 40126 Bologna, Italy.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't