A gallium phthalocyanine dimer with a direct gallium–gallium bond, [tBu4PcGa]2·2dioxane (2), has been synthesized and characterized by Extended X-ray Absorption Fine Structure (EXAFS) spectroscopy, UV/Vis, IR, NMR and MALDI-MS. By EXAFS the gallium–gallium distance in 2 was found to be 2.46 Å. Dimer 2 exhibits reverse saturable absorption with significantly reduced saturation intensity with respect to the starting material tBu4PcGaCl (1) as determined by means of optical limiting experiments.
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Bertagnolli et al. (2004) studied this question.
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