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Volumn 3, Issue 3, 2008, Pages 614-624

Helicity induction and memory of the macromolecular helicity in a polyacetylene bearing a biphenyl pendant

Author keywords

Biaryls; Chiral memory; Chirality; Helical structures; Poly(phenylacetylene)

Indexed keywords


EID: 54549083237     PISSN: 18614728     EISSN: 1861471X     Source Type: Journal    
DOI: 10.1002/asia.200700279     Document Type: Article
Times cited : (20)

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    • Some complexes showed a slight increase in CD intensity with time that reached a constant value after a few days. Therefore, the CD spectra of poly-1 with chiral amines and amino alcohols were recorded in DMSO after standing of the samples at room temperature for 5 days (2-6, 8, 10, and 11) and 14 days 7 and 9, Table 1
    • Some complexes showed a slight increase in CD intensity with time that reached a constant value after a few days. Therefore, the CD spectra of poly-1 with chiral amines and amino alcohols were recorded in DMSO after standing of the samples at room temperature for 5 days (2-6, 8, 10, and 11) and 14 days (7 and 9) (Table 1).
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    • helix), see Supporting Information, Figure S3. A slight difference in the CD spectral pattern above 420 nm observed for some complexes may be ascribed to a small difference in the helical conformations of poly-1.
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    • Structurally similar chiral amino alcohols, such as (R)-8 and (S)-9, did not show such a time-dependent inversion of the helix sense, and the complexes exhibited the same CD pattern even after heating at 80°C. The reason is not clear at present, but a delicate balance in the bulkiness of the substituents of the amino alcohols may be important for the time-dependent inversion of the helix, as observed for the poly-1-(R)-7 system.
    • Structurally similar chiral amino alcohols, such as (R)-8 and (S)-9, did not show such a time-dependent inversion of the helix sense, and the complexes exhibited the same CD pattern even after heating at 80°C. The reason is not clear at present, but a delicate balance in the bulkiness of the substituents of the amino alcohols may be important for the time-dependent inversion of the helix, as observed for the poly-1-(R)-7 system.
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    • Recently, Novak and co-workers reported that an optically active polyguanidine prepared by the helix-sense-selective polymerization of an achiral carbodiimide bearing a bulky anthracene pendant with a chiral titanium complex exhibited a reversible temperature-and solvent-induced chiroptical switch due to a change in the orientation of the pendant anthracene rings, as evidenced by vibrational CD measurements, but the main-chain helicity remained unchanged; see: a) H. Z. Tang, B. M. Novak, J. He, P. L. Polavarapu, Angew. Chem. 2005, 117, 7464-7467;
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    • The memory of the macromolecular helicity and the axial chirality in the biphenyl units of poly-1 assisted by achiral 13 also lasted for a long time (see Supporting Information, Figure S7B).
    • The memory of the macromolecular helicity and the axial chirality in the biphenyl units of poly-1 assisted by achiral 13 also lasted for a long time (see Supporting Information, Figure S7B).
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* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.