The Geometry of the Excited Charge Transfer States: Flattening or Twisting?

• Authors: J. Dobkowski , I. Sazanovich
• Languages of publication: EN

Abstracts

EN

Numerous molecules built of an electron acceptor and electron donor units linked together by single bond exhibit a peculiar behavior in their low-lying electronically excited states. N,N-diethylaminoacetophenone and 4-acetyl-4'-dimethylamino-biphenyl, having acetophenone as the acceptor and differentiated by the donors groups N(CH_3)_2 and dimethylaniline, respectively, were selected as the subject of study. To recognize the excited state relaxation paths the stationary and time-resolved spectroscopy in absorption and emission was applied. Experimental results indicate that after excitation in polar solvents N,N-diethylaminoacetophenone reduces to minimum the overlap between π-electron systems of the donor and acceptor groups relaxing to the twisted internal charge-transfer state; contrary to that, flattening of the 4-acetyl-4'-dimethylamino-biphenyl skeleton generates increase in the overlap of the π-electron systems.

Keywords

EN

33.50.-j; 61.66.Hq

Discipline

• 33.50.-j: Fluorescence and phosphorescence; radiationless transitions, quenching (intersystem crossing, internal conversion)(for energy transfer, see also section 34; for biophysical applications, see 87.64.kv)
• 61.66.Hq: Organic compounds

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2007
• Volume: 112
• Issue: S
• Pages: S-127-S-142

Dates

published

2007-12

received

2007-10-26

Contributors

author

J. Dobkowski

• Institute of Physical Chemistry, Polish Academy of Sciences, Kasprzaka 44, 01-224 Warsaw, Poland

author

I. Sazanovich

• Institute of Physical Chemistry, Polish Academy of Sciences, Kasprzaka 44, 01-224 Warsaw, Poland

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Identifiers

DOI

10.12693/APhysPolA.112.S-127