Linked Life Data

19932508

Source:http://linkedlifedata.com/resource/pubmed/id/19932508

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
3
pubmed:dateCreated
2010-2-17
pubmed:abstractText
The role of n-->pi( *) transitions in the optical spectra of alkoxy- and thioalkyl-substituted phthalocyanines with peripheral substituents is re-examined, based on a detailed analysis of UV-visible absorption, magnetic circular dichroism (MCD) and fluorescence emission spectral data and the results of density functional theory (DFT) and time dependent-density functional theory (TD-DFT) calculations. The npi( *) excited states associated with the lone pairs of the peripheral heteroatoms have been proposed as the origin of a second emission peak observed in the 400-600nm region, which has been assigned as S(2) emission, since S(1) fluorescence associated with the Q band is observed in the near IR region. Our results demonstrate that emission from a photodecomposition product can fully account for this violet emission and that reports of S(2) emission for peripherally substituted phthalocyanines and porphyrazines should be treated with caution.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Mar
pubmed:issn
1873-3344
pubmed:author
pubmed:copyrightInfo
Copyright 2009 Elsevier Inc. All rights reserved.
pubmed:issnType
Electronic
pubmed:volume
104
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
310-7
pubmed:meshHeading
pubmed:year
2010
pubmed:articleTitle
Re-examination of the emission properties of alkoxy- and thioalkyl-substituted phthalocyanines.
pubmed:affiliation
Department of Chemistry, Graduate School of Science, Tohoku University, Sendai 980-8578, Japan.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't