| Budget Amount *help |
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2010: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2009: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2008: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
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| Research Abstract |
Bithiophene derivtives bridged with a bis (spirodienone) unit were synthesized and characterized. Palladium-catalyzed cross-coupling reactions with bromides afforded a variety of pi-extended derivatives. In these compounds, bond breaking and formation under redox conditions were observed by cyclic voltammetry (CV). Especially, 2,2'-bridged-3,3'-bithiophene derivatives showed significant temperature- and scan rate-dependence on CV. These phenomena indicate the existence of the equilibrium between dispiro-compounds and open-ring biradicals. Furthermore, mechanochromism, N,N-dialkylaminophenyl-substituted 2,2'-bridged-3,3'-bithiophene derivatives showed mechanochromism. During grinding the crystals, the color was changed from yellow to reddish orange, and by exposure to organic solvents, the reddish-orange color was immediately turned back to yellow.
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