Linked Life Data

19507899

Source:http://linkedlifedata.com/resource/pubmed/id/19507899

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
23
pubmed:dateCreated
2009-6-10
pubmed:abstractText
The efficiency with which a conjugated porphyrin dimer photosensitizes singlet oxygen production is shown to depend on the excitation wavelength, particularly in a viscous medium. This unprecedented behavior reflects viscosity-dependent dynamics that serve to interconvert two excited singlet state conformations of the porphyrin dimer. The efficiency of intersystem crossing from the two singlet state conformations to a common triplet state is shown to be different. In a viscous medium, each excited state conformation can be prepared selectively. Hence, wavelength-specific irradiation of the porphyrin allows fine control over the concentration of the triplet state produced which, in turn, is reflected in the photosensitized yield of singlet oxygen. This property may be beneficial for many applications requiring the controlled release of an oxidizing species, e.g., microfabrication and singlet oxygen-mediated cell death.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Jun
pubmed:issn
1520-5126
pubmed:author
pubmed:issnType
Electronic
pubmed:day
17
pubmed:volume
131
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
7948-9
pubmed:meshHeading
pubmed:year
2009
pubmed:articleTitle
Intramolecular rotation in a porphyrin dimer controls singlet oxygen production.
pubmed:affiliation
Chemistry Department, Imperial College London, Exhibition Road, SW7 2AZ, UK. m.kuimova@imperial.ac.uk
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't