Linked Life Data

17851425

Source:http://linkedlifedata.com/resource/pubmed/id/17851425

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
4
pubmed:dateCreated
2007-9-13
pubmed:abstractText
A new class of 4H-imidazoles was synthesized starting from fused-ring aromatic dinitriles. Strong bathochromic shifts of the longest wavelength absorptions were observed in the corresponding UV/vis spectra due to a conversion of the merocyanine chromophores into cyanines/(aza)oxonoles upon protonation/deprotonation of the 4H-imidazoles. Novel boratetraazapentalenes were synthesized via a cyclization reaction with boron trifluoride. These mesoionic species bearing a cyanine chromophore not only show NIR-fluorescence, they also participate as part of a quasi-reversible multi-step redox system. Large calculated semiquinone formation constants K(SEM) (3x10(10) to 5x10(11)) indicate a high thermodynamic stability of the corresponding radical anions (SEM).
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:issn
1420-3049
pubmed:author
pubmed:issnType
Electronic
pubmed:volume
12
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
723-34
pubmed:dateRevised
2009-10-27
pubmed:meshHeading
pubmed:year
2007
pubmed:articleTitle
Multi-step redox systems with NIR-fluorescence based on 4H-imidazoles.
pubmed:affiliation
Institute of Organic and Makromolecular Chemistry, Friedrich-Schiller University D-07743 Jena, Humboldtstr. 10, Germany.
pubmed:publicationType
Journal Article