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Synthesis, Crystal Structure, and Nonlinear Optical Behavior of β-Unsubstituted mesomeso E-Vinylene-Linked Porphyrin Dimers

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posted on 24.11.2005, 00:00 authored by Michael J. Frampton, Huriye Akdas, Andrew R. Cowley, Joy E. Rogers, Jonathan E. Slagle, Paul A. Fleitz, Mikhail Drobizhev, Aleksander Rebane, Harry L. Anderson
A vinylene-linked porphyrin dimer, with no substituents at the β-positions, has been synthesized by CuI/CsF promoted Stille coupling. In the crystal structure of this dimer, the C2H2 bridge is twisted by 45° relative to the plane of the porphyrins. The absorption, emission spectra, and electrochemistry reveal substantial porphyrin−porphyrin π-conjugation. The triplet excited-state absorption spectrum of this dimer makes it suitable for reverse saturable absorption at 710−900 nm.