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ƒSyntheses and Electrochromism on Triple-Decker Sandwich Type of Dinuclear Rare Earth Metal Complexes of Phthalocyanines„

Phthalocyanines (Pc) are the organic dyes that form a complex with a variety of metal ions. Considerable attention has been paid to the studies on the Pc complexes in order to clarify the basic electronic and structural properties of the compounds. Moreover, extensive efforts have also been made to settle down some their practical usages as functional materials. With the aim of developing new functional materials arising from these Pc systems, we are currently studying on the syntheses, spectroscopic properties, and electrochemical properties of these Pc complexes.
Pc gives double- or triple-decker sandwich complexes when it is reacted with metal ions having a large radius, such as rare earth metal(III) ions. Recently, we succeeded in the syntheses and characterization of some heteroleptic triple-decker Lu(III) compounds consisting of two different Pc derivatives; a Pc derivative having eight butoxy groups (obPC = A) and a Pc without any modification (Pc = B) (see the AAA type and the BAB type of compounds shown above). We have also succeeded for the first time to observe reversible color change based on the electrochemical oxidation-reduction processes (electrochromism) in these heteroleptic systems. The detailed studies on their electrochromic behaviors, together with their application studies, are now in progress in our group.

œInformationiKyushu Universityj