Effects of pi-stacking interactions on the near carbon K-edge x-ray absorption fine structure: a theoretical study of the ethylene pentamer and the phthalocyanine dimer.
X-ray absorption spectra have been determined for ethylene and free base phthalocyanine at the carbon K-edge with use of the complex polarization propagator method combined with Kohn-Sham density functional theory and the Coulomb attenuated method B3LYP exchange-correlation functional. Apart from isolated molecules, the study includes pi-stacked systems of the phthalocyanine dimer and the ethylene dimer, trimer, tetramer, and pentamer. For ethylene, pi-stacking involves a reduction in transition energy of the valence pi( *)-band by some 70 meV and large spectral changes (regarding also shape and intensity) of the Rydberg bands. For phthalocyanine, there are large spectral changes in the entire valence pi( *)-part of the spectrum.
Linares
Mathieu
M
Department of Physics, Chemistry and Biology, Linkoping University, SE-581 83 Linkoping, Sweden.
Stafström
Sven
S
Norman
Patrick
P