TY - JOUR
T1 - Significant Enhancement of Absorption and Luminescence Dissymmetry Factors in the Far-Red Region
T2 - A Zinc(II) Homoleptic Helicate Formed by a Pair of Achiral Dipyrromethene Ligands
AU - Ito, Hiroaki
AU - Sakai, Hayato
AU - Okayasu, Yoshinori
AU - Yuasa, Junpei
AU - Mori, Tadashi
AU - Hasobe, Taku
N1 - Funding Information:
This work was partially supported by JSPS KAKENHI Grant Numbers Nos. JP18H01957, 18K19063, JP17H05270 and JP17H05162 to T.H., Nos. JP15H03779, JP15K13642, JP16KK0111, JP17H05261, JP18H01964 to T.M., No. JP17H05386 to J.Y. and Nos. JP17K14476 and JP17H05381 to H.S. This work was partially performed under the Cooperative Research Program of ?Network Joint Research Centre for Materials and Devices?. We are grateful to Mr. S. Katao (NAIST) for the single-crystal analysis of Zn(Phena-dpm)2.
Funding Information:
This work was partially supported by JSPS KAKENHI Grant Numbers Nos. JP18H01957, 18K19063, JP17H05270 and JP17H05162 to T.H., Nos. JP15H03779, JP15K13642, JP16KK0111, JP17H05261, JP18H01964 to T.M., No. JP17H05386 to J.Y. and Nos. JP17K14476 and JP17H05381 to H.S. This work was partially performed under the Cooperative Research Program of “Network Joint Research Centre for Materials and Devices”. We are grateful to Mr. S. Katao (NAIST) for the single-crystal analysis of Zn(Phena-dpm)2.
PY - 2018/11/13
Y1 - 2018/11/13
N2 - A homoleptic zinc(II) helicate organized by a pair of achiral dipyrromethene ligands through zinc(II) coordination was synthesized to evaluate the chiroptical properties. This zinc complex showed strong exciton-coupled chiroptical responses from the helical configuration with a large absorption dissymmetry factor |gabs| (up to 0.20). More importantly, intense polarized luminescence in the far-red region (700–850 nm) with a fluorescence quantum yield ΦFL of 0.23 was observed for this helicate with a dissymmetry factor |glum| of 0.022, the largest value among rare-earth- and precious-metal-free small molecules. These unprecedentedly large g values were supported by theoretical calculations.
AB - A homoleptic zinc(II) helicate organized by a pair of achiral dipyrromethene ligands through zinc(II) coordination was synthesized to evaluate the chiroptical properties. This zinc complex showed strong exciton-coupled chiroptical responses from the helical configuration with a large absorption dissymmetry factor |gabs| (up to 0.20). More importantly, intense polarized luminescence in the far-red region (700–850 nm) with a fluorescence quantum yield ΦFL of 0.23 was observed for this helicate with a dissymmetry factor |glum| of 0.022, the largest value among rare-earth- and precious-metal-free small molecules. These unprecedentedly large g values were supported by theoretical calculations.
KW - circular dichroism
KW - circularly polarized luminescence
KW - far-red fluorescence
KW - zinc helicate
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U2 - 10.1002/chem.201804171
DO - 10.1002/chem.201804171
M3 - Article
C2 - 30179282
AN - SCOPUS:85055284296
SN - 0947-6539
VL - 24
SP - 16889
EP - 16894
JO - Chemistry - A European Journal
JF - Chemistry - A European Journal
IS - 63
ER -