Fluorophores emitting in the near-infrared (NIR) are highly desired for various applications, but increasing nonradiative rates cause severe fluorescence quenching for wavelengths beyond 800 nm. Here, a bis(squaraine) dye is reported that bears two NIR dyes in a head-to-tail chromophore arrangement. This arrangement leads to intramolecular J-type exciton coupling, resulting in an absorption maximum at 961 nm and a fluorescence peak at 971 nm with a quantum yield of 0.33% in chloroform. In less polar toluene, the bis(squaraine) self-assembles into nanofibers, affording another bathochromic shift with an absorption maximum at 1095 nm and a fluorescence peak at 1116 nm originating from intermolecular J-type coupling.
%0 Journal Article
%1 Shen_2021
%A Shen, Chia-An
%A Stolte, Matthias
%A Kim, Jin Hong
%A Rausch, Anja
%A Würthner, Frank
%D 2021
%I American Chemical Society (ACS)
%J J. Am. Chem. Soc.
%K myown
%N 31
%P 11946--11950
%R 10.1021/jacs.1c05934
%T Double J-Coupling Strategy for Near Infrared Emitters
%U https://doi.org/10.1021%2Fjacs.1c05934
%V 143
%X Fluorophores emitting in the near-infrared (NIR) are highly desired for various applications, but increasing nonradiative rates cause severe fluorescence quenching for wavelengths beyond 800 nm. Here, a bis(squaraine) dye is reported that bears two NIR dyes in a head-to-tail chromophore arrangement. This arrangement leads to intramolecular J-type exciton coupling, resulting in an absorption maximum at 961 nm and a fluorescence peak at 971 nm with a quantum yield of 0.33% in chloroform. In less polar toluene, the bis(squaraine) self-assembles into nanofibers, affording another bathochromic shift with an absorption maximum at 1095 nm and a fluorescence peak at 1116 nm originating from intermolecular J-type coupling.
@article{Shen_2021,
abstract = {Fluorophores emitting in the near-infrared (NIR) are highly desired for various applications, but increasing nonradiative rates cause severe fluorescence quenching for wavelengths beyond 800 nm. Here, a bis(squaraine) dye is reported that bears two NIR dyes in a head-to-tail chromophore arrangement. This arrangement leads to intramolecular J-type exciton coupling, resulting in an absorption maximum at 961 nm and a fluorescence peak at 971 nm with a quantum yield of 0.33% in chloroform. In less polar toluene, the bis(squaraine) self-assembles into nanofibers, affording another bathochromic shift with an absorption maximum at 1095 nm and a fluorescence peak at 1116 nm originating from intermolecular J-type coupling.},
added-at = {2021-09-01T09:41:04.000+0200},
author = {Shen, Chia-An and Stolte, Matthias and Kim, Jin Hong and Rausch, Anja and Würthner, Frank},
biburl = {https://www.bibsonomy.org/bibtex/27949a76ef40d5d1df1e0d77e713cd4ad/wuerthner_group},
doi = {10.1021/jacs.1c05934},
interhash = {0cd89ae78b768335ea500457ce753792},
intrahash = {7949a76ef40d5d1df1e0d77e713cd4ad},
journal = {J. Am. Chem. Soc.},
keywords = {myown},
month = jul,
number = 31,
pages = {11946--11950},
publisher = {American Chemical Society ({ACS})},
timestamp = {2021-10-18T11:07:25.000+0200},
title = {Double J-Coupling Strategy for Near Infrared Emitters},
url = {https://doi.org/10.1021%2Fjacs.1c05934},
volume = 143,
year = 2021
}