Abstract
We investigate the longitudinal static second hyperpolarizability (γ) of open-shell singlet diphenalenyl radical dimer using the spin-unrestricted density functional theory method. This dimer is known to be a model unit of a slipped stacked linear chain with an unusually short average π-π distance of 3.137 Å. The longitudinal γ per monomer for this dimer is found to be significantly (about twice) enhanced as compared to that of monomer. This originates in the field-induced intermolecular virtual charge transfer between both-end phenalenyl rings through the strong covalent interaction between the unpaired electrons of the cofacial phenalenyl rings.
Original language | English |
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Pages (from-to) | 97-104 |
Number of pages | 8 |
Journal | Chemical Physics Letters |
Volume | 454 |
Issue number | 1-3 |
DOIs | |
Publication status | Published - 10 Mar 2008 |