Chirality amplification in helical block copolymers. Synthesis and chiroptical properties of block copolymers of chiral/achiral acetylene monomers?
Polymer Chemistry Pub Date: 2015-07-07 DOI: 10.1039/C5PY00743G
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)![[double bond, length as m-dash]](https://www.rsc.org/images/entities/char_e001.gif)
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.
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Journal Name：Polymer Chemistry
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CAS no.: 89640-58-4
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