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author:

Li, Yunjing (Li, Yunjing.) [1] | Pritchett, Timothy M. (Pritchett, Timothy M..) [2] | Huang, Jiandong (Huang, Jiandong.) [3] (Scholars:黄剑东) | Ke, Meirong (Ke, Meirong.) [4] (Scholars:柯美荣) | Shao, Pin (Shao, Pin.) [5] | Sun, Wenfang (Sun, Wenfang.) [6]

Indexed by:

EI Scopus SCIE

Abstract:

The photophysical properties, such as the UV-vis absorption spectra, triplet transient difference absorption spectra, triplet excited-state extinction coefficients, quantum yields of the triplet excited state, and lifetimes of the triplet excited state, of 10 novel zinc phthalocyanine derivatives with mono- or tetraperipheral substituents have been systematically investigated in DMSO solution. All these complexes exhibit a wide optical window in the visible spectral range and display long triplet excited-state lifetimes (140-240 mu s). It has been found that the complexes with tetrasubstituents at the alpha-positions exhibit a bathochromic shift in their UV-vis absorption spectra, fluorescence spectra, and triplet transient difference absorption spectra and have larger triplet excited-state absorption coefficients. The nonlinear absorption of these complexes has been investigated using the Z-scan technique. It is revealed that all complexes exhibit a strong reverse saturable absorption at 532 nm for nanosecond and picosecond laser pulses. The excited-state absorption cross sections were deten-nined through a theoretical fitting of the experimental data using a five-band model. The complexes with tetrasubstituents at the alpha-positions exhibit larger ratios of triplet excited-state absorption to ground-state absorption cross sections (sigma(T)/sigma(g)) than the other complexes. In addition, the wavelength-dependent nonlinear absorption of these complexes was studied in the range of 470-550 nm with picosecond laser pulses. All complexes exhibit reverse saturable absorption in a broad visible spectral range for picosecond laser pulses. Finally, the nonlinear transmission behavior of these complexes for nanosecond laser pulses was demonstrated at 532 nm. All complexes, and especially the four alpha-tetrasubstituted complexes, exhibit stronger reverse saturable absorption than unsubstituted zinc plithalocyanines due to the larger ratio of their excited-state absorption cross sections to their respective ground-state absorption cross sections.

Keyword:

Community:

  • [ 1 ] [Li, Yunjing]N Dakota State Univ, Dept Chem & Mol Biol, Fargo, ND 58105 USA
  • [ 2 ] [Shao, Pin]N Dakota State Univ, Dept Chem & Mol Biol, Fargo, ND 58105 USA
  • [ 3 ] [Sun, Wenfang]N Dakota State Univ, Dept Chem & Mol Biol, Fargo, ND 58105 USA
  • [ 4 ] [Pritchett, Timothy M.]USA, Res Lab, AMSRD ARL SE EM, Adelphi, MD 20783 USA
  • [ 5 ] [Huang, Jiandong]Fuzhou Univ, Coll Chem & Chem Engn, Fuzhou 350002, Peoples R China
  • [ 6 ] [Ke, Meirong]Fuzhou Univ, Coll Chem & Chem Engn, Fuzhou 350002, Peoples R China

Reprint 's Address:

  • [Sun, Wenfang]N Dakota State Univ, Dept Chem & Mol Biol, Fargo, ND 58105 USA

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Source :

JOURNAL OF PHYSICAL CHEMISTRY A

ISSN: 1089-5639

Year: 2008

Issue: 31

Volume: 112

Page: 7200-7207

2 . 8 7 1

JCR@2008

2 . 7 0 0

JCR@2023

ESI Discipline: CHEMISTRY;

JCR Journal Grade:1

Cited Count:

WoS CC Cited Count: 91

SCOPUS Cited Count:

ESI Highly Cited Papers on the List: 0 Unfold All

WanFang Cited Count:

Chinese Cited Count:

30 Days PV: 1

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