Search: onr:"swepub:oai:DiVA.org:umu-8721" >
Dimers of Dipyrrome...
-
Bergström, FredrikUmeå universitet,Kemiska institutionen
(author)
Dimers of Dipyrrometheneboron Difluoride (BODIPY) with Light Spectroscopic Applications in Chemistry and Biology
- Article/chapterEnglish2002
Publisher, publication year, extent ...
-
2001-12-19
-
American Chemical Society (ACS),2002
-
printrdacarrier
Numbers
-
LIBRIS-ID:oai:DiVA.org:umu-8721
-
https://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-8721URI
-
https://doi.org/10.1021/ja010983fDOI
Supplementary language notes
-
Language:English
-
Summary in:English
Part of subdatabase
Classification
-
Subject category:ref swepub-contenttype
-
Subject category:art swepub-publicationtype
Notes
-
A ground-state dimer (denoted DI) exhibiting a strong absorption maximum at 477 nm ( = 97 000 M-1cm-1) can form between adjacent BODIPY groups attached to mutant forms of the protein, plasminogen activator inhibitor type 1 (PAI-1). No fluorescence from excited DI was detected. A locally high concentration of BODIPY groups was also achieved by doping lipid phases (micelles, vesicles) with BODIPY-labeled lipids. In addition to an absorption band located at about 480 nm, a new weak absorption band is also observed at ca. 570 nm. Both bands are ascribed to the formation of BODIPY dimers of different conformation (DI and DII). Contrary to DI in PAI-1, the DII aggregates absorbing at 570 nm are emitting light observed as a broad band centered at about 630 nm. The integrated absorption band of DI is about twice that of the monomer, which is compatible with exciton coupling within a dimer. The Förster radius of electronic energy transfer between a BODIPY excited monomer and the ground-state dimer (DI) is 57 ± 2 Å. A simple model of exciton coupling suggests that in DI two BODIPY groups are stacked on top of each other in a sandwich-like configuration with parallel electronic transition dipoles. For DII the model suggests that the S0 S1 transition dipoles are collinear. An explanation for the previously reported (J. Am. Chem. Soc. 1994, 116, 7801) exceptional light spectroscopic properties of BODIPY is also presented. These are ascribed to the extraordinary electric properties of the BODIPY chromophore. First, changes of the permanent electric dipole moment ( -0.05 D) and polarizability (-26 × 10-40 C m2 V-1) between the ground and the first excited states are small. Second, the S0 S1 electronic transition dipole moments are perpendicular to .
Added entries (persons, corporate bodies, meetings, titles ...)
-
Mikhalyov, IlyaUmeå universitet,Kemiska institutionen
(author)
-
Hägglöf, PeterUmeå universitet,Institutionen för medicinsk kemi och biofysik
(author)
-
Wortmann, Rüdiger
(author)
-
Ny, TorUmeå universitet,Institutionen för medicinsk kemi och biofysik(Swepub:umu)tony0001
(author)
-
Johansson, Lennart B-Å
(author)
-
Umeå universitetKemiska institutionen
(creator_code:org_t)
Related titles
-
In:Journal of the American Chemical Society: American Chemical Society (ACS)124:2, s. 196-2040002-78631520-5126
Internet link
Find in a library
To the university's database