Non-coplanar 9,9-diphenyl-substituted oligofluorenes with large two-photon absorption enhancement.
The non-coplanar substituted phenyl rings at the 9-position of a fluorenyl unit can be involved in pi-electron delocalization in which the resulting oligofluorenes exhibit a very large enhancement of two-photon absorption cross sections up to 2559 GM at 710 nm.
Wu
Po Lam
PL
Centre for Advanced Luminescence Materials, Hong Kong Baptist University, Kowloon Tong, Hong Kong SAR, China.
Xia
Ping Fang
PF
Li
Zhong Hui
ZH
Feng
Xin Jiang
XJ
Tam
Hoi Lam
HL
Li
King Fai
KF
Jiao
Yong
Y
Wong
Man Shing
MS
Cheah
Kok Wai
KW
D005449:Fluorenes / Q000138:chemical synthesis / Q000737:chemistry*; D015394:Molecular Structure; D017785:Photons; D011789:Quantum Theory; D013050:Spectrometry, Fluorescence; D013053:Spectrophotometry; D013056:Spectrophotometry, Ultraviolet; D044366:Transition Temperature
D005449:Fluorenes