Polymeric ladderphanes.
A new class of polymers, which have a double-stranded polybinorbornene skeleton with multilayer planar oligoaryl linkers, defined as polymeric ladderphanes, are synthesized. The structures of these ladderphanes are determined by spectroscopic means. Photophysical studies and time-resolved fluorescence spectroscopic investigations reveal that there is a strong interaction between the chromophore linkers. Thus, Soret band splitting in the absorption spectrum of the polymer with porphyrin linker (12e), significant fluorescence quenching with oligoaryl linkers (12b-d), and excimer emission with a terphenylene-diethynylene linker (12a) are characteristic photophysical properties of these polymers. Scanning tunneling microscopy shows that polymers 12b and d exhibit a ladder-like morphology and form a supramolecular assembly leading to a two-dimensional ordered array on a highly oriented pyrolytic graphite surface.
Chou
Chih-Ming
CM
Department of Chemistry, National Taiwan University, Taipei, Taiwan 106.
Lee
Shern-Long
SL
Chen
Chih-Hsien
CH
Biju
Akkattu Thankappan
AT
Wang
Hsian-Wen
HW
Wu
Yi-Lin
YL
Zhang
Guo-Fu
GF
Yang
Kuang-Wei
KW
Lim
Tsong-Shin
TS
Huang
Min-Jie
MJ
Tsai
Po-Yu
PY
Lin
Kin-Chuan
KC
Huang
Shou-Ling
SL
Chen
Chun-Hsien
CH
Luh
Tien-Yau
TY