TY - JOUR
T1 - Tetraaryldiborane(4) Can Emit Dual Fluorescence Responding to the Structural Change around the B–B Bond
AU - Shoji, Yoshiaki
AU - Tanaka, Naoki
AU - Ikabata, Yasuhiro
AU - Sakai, Hayato
AU - Hasobe, Taku
AU - Koch, Norbert
AU - Nakai, Hiromi
AU - Fukushima, Takanori
N1 - Funding Information:
This work was supported by Grant‐in‐Aid for Transformative Research Areas (A) “Condensed Conjugation” (JSPS KAKENHI Grant Numbers JP20H05869 for Y.S. and JP20H05868 for T.F.) from MEXT, JSPS KAKENHI (JP20H02722 for Y.S.), and the Research Program of “Five‐star Alliance” in “NJRC Mater. & Dev.”. We thank the Materials Analysis Division, Open Facility Center, Tokyo Institute of Technology, for their support with the NMR measurements. We acknowledge Prof. Yasuyuki Araki (Tohoku University) for valuable discussions on the emission properties of MesB. Some of the present calculations were performed at the Research Center for Computational Science (RCCS), Okazaki Research Facilities, the National Institutes of Natural Sciences (NINS). 4 2
Funding Information:
This work was supported by Grant-in-Aid for Transformative Research Areas (A) ?Condensed Conjugation? (JSPS KAKENHI Grant Numbers JP20H05869 for Y.S. and JP20H05868 for T.F.) from MEXT, JSPS KAKENHI (JP20H02722 for Y.S.), and the Research Program of ?Five-star Alliance? in ?NJRC Mater. & Dev.?. We thank the Materials Analysis Division, Open Facility Center, Tokyo Institute of Technology, for their support with the NMR measurements. We acknowledge Prof. Yasuyuki Araki (Tohoku University) for valuable discussions on the emission properties of Mes4B2. Some of the present calculations were performed at the Research Center for Computational Science (RCCS), Okazaki Research Facilities, the National Institutes of Natural Sciences (NINS).
Publisher Copyright:
© 2021 Wiley-VCH GmbH
PY - 2022/1/3
Y1 - 2022/1/3
N2 - We report the successful synthesis of tetramesityldiborane(4) (Mes4B2) through the reductive coupling of a dimesitylborinium ion. Owing to the steric protection conferred by the mesityl groups, Mes4B2 shows exceptional chemical stability and remains intact in water. Single-crystal X-ray analysis revealed that Mes4B2 has an orthogonal geometry, where the B–B center is completely hidden by the mesityl groups. Remarkably, Mes4B2 emits dual fluorescence at 460 and 620 nm, both in solution and in the solid state. Theoretical calculations showed that Mes4B2 in the excited S1 state adopts a twisted or planar geometry, which is responsible for the shorter- or longer-wavelength fluorescence, respectively. The intensity ratio of the dual fluorescence is sensitive to the viscosity of the medium, which suggests that Mes4B2 has potential as a ratiometric viscosity sensor.
AB - We report the successful synthesis of tetramesityldiborane(4) (Mes4B2) through the reductive coupling of a dimesitylborinium ion. Owing to the steric protection conferred by the mesityl groups, Mes4B2 shows exceptional chemical stability and remains intact in water. Single-crystal X-ray analysis revealed that Mes4B2 has an orthogonal geometry, where the B–B center is completely hidden by the mesityl groups. Remarkably, Mes4B2 emits dual fluorescence at 460 and 620 nm, both in solution and in the solid state. Theoretical calculations showed that Mes4B2 in the excited S1 state adopts a twisted or planar geometry, which is responsible for the shorter- or longer-wavelength fluorescence, respectively. The intensity ratio of the dual fluorescence is sensitive to the viscosity of the medium, which suggests that Mes4B2 has potential as a ratiometric viscosity sensor.
UR - http://www.scopus.com/inward/record.url?scp=85119209340&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85119209340&partnerID=8YFLogxK
U2 - 10.1002/anie.202113549
DO - 10.1002/anie.202113549
M3 - Article
C2 - 34677888
AN - SCOPUS:85119209340
SN - 1433-7851
VL - 61
JO - Angewandte Chemie - International Edition
JF - Angewandte Chemie - International Edition
IS - 1
M1 - e202113549
ER -