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Nonlinear Optical and Two‐Photon Absorption Properties of 1,3,5‐Tricyano‐2,4,6‐tris(styryl)benzene‐Containing Octupolar Oligomers
Author(s) -
Cho Bong Rae,
Piao Ming Jun,
Son Kyung Hwa,
Lee Sang Hae,
Yoon Soo Jung,
Jeon SeungJoon,
Cho Minhaeng
Publication year - 2002
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/1521-3765(20020902)8:17<3907::aid-chem3907>3.0.co;2-f
Subject(s) - chemistry , absorption (acoustics) , nanosecond , molecule , two photon absorption , fluorescence , excited state , benzene , excitation , absorption spectroscopy , spectral line , photochemistry , molecular physics , laser , atomic physics , optics , physics , organic chemistry , quantum mechanics , astronomy
Octupolar oligomers containing 2–12 molecules of 1,3,5‐tricyano‐2,4,6‐tris(styryl)benzene derivatives have been synthesized and their nonlinear optical and two‐photon absorption (TPA) properties were determined. The β (0) values are in the range of (85–1219)×10 −30 esu and increase monotonically with the increasing number of the octupolar units within the molecule. The two‐photon‐induced fluorescence excitation spectra are quite similar to the single‐photon absorption spectra except that the wavelength is doubled, indicating that the one‐ and two‐photon allowed excited states are the same. The peak TPA cross‐section values ( δ max ) measured with nanosecond pulses by the two‐photon‐induced fluorescence method are in the range (3010–62 930)×10 −50 cm 4 s photon −1 . The δ max increases as the number of the octupolar units in the molecules increases. A linear relationship is observed between δ max and β , and this δ – β relationship serves as a useful design strategy for the synthesis of novel octupolar oligomers and polymers with large TPA and β .