TY - JOUR
T1 - Sequential N-Alkylations of Tetrabenzotetraaza[8]circulene as a Tool To Tune Its Optical Properties
AU - Chen, Fengkun
AU - Hong, Yong Seok
AU - Kim, Dongho
AU - Tanaka, Takayuki
AU - Osuka, Atsuhiro
N1 - Publisher Copyright:
© 2017 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim
PY - 2017/8/1
Y1 - 2017/8/1
N2 - Sequential N-alkylations of tetrabenzotetraaza[8]circulene provided mono-, di-, tri, and tetra-N-alkylated products in a controlled manner. Curiously, only opp isomer was obtained as a di-N-alkylated product. Upon increase of the N-alkyl groups, the absorption and emission spectra exhibit continuous red-shifts, and the excited-state lifetimes become shortened, probably because of increased steric congestion at the nitrogen atoms that causes the central core to deviate from planarity. Mixed N-substituted [8]circulenes have been also prepared.
AB - Sequential N-alkylations of tetrabenzotetraaza[8]circulene provided mono-, di-, tri, and tetra-N-alkylated products in a controlled manner. Curiously, only opp isomer was obtained as a di-N-alkylated product. Upon increase of the N-alkyl groups, the absorption and emission spectra exhibit continuous red-shifts, and the excited-state lifetimes become shortened, probably because of increased steric congestion at the nitrogen atoms that causes the central core to deviate from planarity. Mixed N-substituted [8]circulenes have been also prepared.
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U2 - 10.1002/cplu.201600537
DO - 10.1002/cplu.201600537
M3 - Article
C2 - 31961605
AN - SCOPUS:85005822679
SN - 2192-6506
VL - 82
SP - 1048
EP - 1051
JO - ChemPlusChem
JF - ChemPlusChem
IS - 7
ER -