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The spectroscopic properties of a series of four bistriarylamine donor-pi-bridge-donor D-pi-D compounds (dimers), composed of two asymmetric triarylamine chromophores (monomers) are investigated. The donor-pi-bridge-donor (D- pi- D) motive plays an increasingly important role in conjugated pi-electrons systems for two-photon absorption applications.

The absorption properties of a series of bis-triarylamino-[2.2]paracyclophane diradical dications are presented and the electronic couplings are calculated by a generalized Mulliken-Hush (GMH) approach. The results have demonstrated a close similarity of the exciton and GMH models and as exciton coupling is viewed as a coherent energy transfer process, a close analogy of charge transfer and energy transfer processes has resulted.

A series of [2.2]paracyclophane-bridged bis-triarylamine mixed-valence (MV) radical cations were analyzed by a generalized Mulliken-Hush (GMH) three-level model. It is concluded from the GMH analysis that the [2.2]paracyclophane moiety is not the limiting factor which governs the intramolecular charge transfer.

The visible/near-infrared (vis/NIR) spectra of four bis(triarylamine) radical cation mixed valence systems with varying bridge units in the framework of the generalized Mulliken-Hush theory are analyzed. A three level model is applied by using computational AM1-CI derived, experimental transition moments and energies to obtain electronic coupling matrix elements.