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Chirality amplification in helical block copolymers. Synthesis and chiroptical properties of block copolymers of chiral/achiral acetylene monomers
| Content Provider | Semantic Scholar |
|---|---|
| Author | Kumazawa, Shohei Castanon, Jesus Rodriguez Shiotsuki, Masashi Sato, Takahiro Sanda, Fumio |
| Copyright Year | 2015 |
| Abstract | Block copolymers of N-tert-butoxycarbonyl-L-valine 4-ethynylanilide (1a) and N-tert-butoxycarbonylglycine 4-ethynylanilide (1b) with various compositions were synthesized by block copolymerization using a [(nbd)Rh{C(Ph)CPh2}(PPh3)]/PPh3 catalyst. The block copolymers exhibited intense Cotton effects in the absorption region of the conjugated polyacetylene backbone in CHCl3, THF and DMF, indicating the formation of predominantly one-handed helical structures. Amplification of g values as a function of chiral unit content was observed in the block copolymers. The relationship between g/gmax and molecular weight of the achiral block agreed with the predictions of the Ising model for a linear cooperative system, confirming the presence of chirality transfer from the chiral block to the achiral block. |
| Starting Page | 5931 |
| Ending Page | 5939 |
| Page Count | 9 |
| File Format | PDF HTM / HTML |
| DOI | 10.1039/C5PY00743G |
| Alternate Webpage(s) | http://www.rsc.org/suppdata/c5/py/c5py00743g/c5py00743g1.pdf |
| Alternate Webpage(s) | https://doi.org/10.1039/C5PY00743G |
| Volume Number | 6 |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
