| Budget Amount *help |
¥5,330,000 (Direct Cost: ¥4,100,000、Indirect Cost: ¥1,230,000)
Fiscal Year 2013: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2012: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2011: ¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
|
|---|
| Research Abstract |
Poly(biphenyleneethynylene-alt-phenyleneethynylene) derivatives bearing crown ether moieties as molecular recognition sites in the main chains were synthesized, and chirality induction in the obtained polymers upon complexation with optically active amino acids and amines and the stability of the induced helical conformation were investigated by using circular dichroism (CD) spectroscopy in order to construct novel helical pi-conjugated polymers. The obtained polymers folded into a preferred-handed helical conformation in chloroform-acetonitrile (1/9) upon complexation with chiral guests. After replacement of the chiral guests with achiral guests, the induced macromolecular helicity could be maintained and the polymer showed a reversible conformational change between preferred-handed helix and random coil in response to change in solvents. This is the first example of macromolecular helicity memory capable of reversible conformational change.
|
